SONAR-236 remove deprecated code from checkstyle plugin + display default value of rule parameters in Q profile console

57 files changed, 3369 insertions, 0 deletions

diff --git a/sonar-squid/src/main/java/org/sonar/squid/Squid.java b/sonar-squid/src/main/java/org/sonar/squid/Squid.java
new file mode 100644
index 00000000000..25547f148c5
--- /dev/null
+++ b/sonar-squid/src/main/java/org/sonar/squid/Squid.java
@@ -0,0 +1,146 @@
+/*
+ * Sonar, open source software quality management tool.
+ * Copyright (C) 2009 SonarSource SA
+ * mailto:contact AT sonarsource DOT com
+ *
+ * Sonar is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * Sonar is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Sonar; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
+ */
+package org.sonar.squid;
+
+import java.util.Collection;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+
+import org.picocontainer.MutablePicoContainer;
+import org.picocontainer.containers.TransientPicoContainer;
+import org.sonar.graph.DirectedGraph;
+import org.sonar.graph.DirectedGraphAccessor;
+import org.sonar.squid.api.CodeScanner;
+import org.sonar.squid.api.CodeVisitor;
+import org.sonar.squid.api.Query;
+import org.sonar.squid.api.SourceCode;
+import org.sonar.squid.api.SourceCodeEdge;
+import org.sonar.squid.api.SourceCodeSearchEngine;
+import org.sonar.squid.api.SourceCodeTreeDecorator;
+import org.sonar.squid.api.SourceProject;
+import org.sonar.squid.api.SquidConfiguration;
+import org.sonar.squid.indexer.SquidIndex;
+import org.sonar.squid.measures.Metric;
+import org.sonar.squid.measures.MetricDef;
+
+public class Squid implements DirectedGraphAccessor<SourceCode, SourceCodeEdge>, SourceCodeSearchEngine {
+
+  private MutablePicoContainer pico;
+  private SourceProject project;
+  private SquidIndex squidIndex;
+  private DirectedGraph<SourceCode, SourceCodeEdge> graph = new DirectedGraph<SourceCode, SourceCodeEdge>();
+  private Set<CodeVisitor> externalCodeVisitors = new HashSet<CodeVisitor>();
+
+  public Squid(SquidConfiguration conf) {
+    pico = new TransientPicoContainer();
+    pico.addComponent(conf);
+    project = new SourceProject("Project");
+    squidIndex = new SquidIndex();
+    squidIndex.index(project);
+    pico.addComponent(squidIndex);
+    pico.addComponent(project);
+    pico.addComponent(graph);
+  }
+
+  public Squid() {
+    this(new SquidConfiguration());
+  }
+
+  public void registerVisitor(CodeVisitor visitor) {
+    externalCodeVisitors.add(visitor);
+  }
+
+  public void registerVisitor(Class<? extends CodeVisitor> visitor) {
+    addToPicocontainer(visitor);
+    externalCodeVisitors.add(pico.getComponent(visitor));
+  }
+
+  public <SCANNER extends CodeScanner> SCANNER register(Class<SCANNER> scannerClass) {
+    addToPicocontainer(scannerClass);
+    SCANNER scanner = pico.getComponent(scannerClass);
+    for (Object clazz : scanner.getVisitorClasses()) {
+      addToPicocontainer((Class) clazz);
+      scanner.accept(pico.<CodeVisitor>getComponent((Class) clazz));
+    }
+    for (CodeVisitor externalVisitor : externalCodeVisitors) {
+      scanner.accept(externalVisitor);
+    }
+    return scanner;
+  }
+
+  @Deprecated
+  public SourceProject aggregate() {
+    return decorateSourceCodeTreeWith(Metric.values());
+  }
+
+  public SourceProject decorateSourceCodeTreeWith(MetricDef... metrics) {
+    SourceCodeTreeDecorator decorator = new SourceCodeTreeDecorator(project);
+    decorator.decorateWith(metrics);
+    return project;
+  }
+
+  public SourceProject getProject() {
+    return project;
+  }
+
+  private void addToPicocontainer(Class classToExpose) {
+    if (pico.getComponent(classToExpose) == null) {
+      pico.addComponent(classToExpose);
+    }
+  }
+
+  public SourceCode search(String key) {
+    return squidIndex.search(key);
+  }
+
+  public Collection<SourceCode> search(Query... query) {
+    return squidIndex.search(query);
+  }
+
+  public SourceCodeEdge getEdge(SourceCode from, SourceCode to) {
+    return graph.getEdge(from, to);
+  }
+
+  public Collection<SourceCodeEdge> getIncomingEdges(SourceCode to) {
+    return graph.getIncomingEdges(to);
+  }
+
+  public Collection<SourceCodeEdge> getOutgoingEdges(SourceCode from) {
+    return graph.getOutgoingEdges(from);
+  }
+
+  public Set<SourceCode> getVertices() {
+    return graph.getVertices();
+  }
+
+  public List<SourceCodeEdge> getEdges(Collection<SourceCode> vertices) {
+    return graph.getEdges(vertices);
+  }
+
+  public boolean hasEdge(SourceCode from, SourceCode to) {
+    return graph.hasEdge(from, to);
+  }
+
+  public void flush() {
+    graph = null;
+    pico = null;
+  }
+}
diff --git a/sonar-squid/src/main/java/org/sonar/squid/api/AnalysisException.java b/sonar-squid/src/main/java/org/sonar/squid/api/AnalysisException.java
new file mode 100644
index 00000000000..8bb52803096
--- /dev/null
+++ b/sonar-squid/src/main/java/org/sonar/squid/api/AnalysisException.java
@@ -0,0 +1,36 @@
+/*
+ * Sonar, open source software quality management tool.
+ * Copyright (C) 2009 SonarSource SA
+ * mailto:contact AT sonarsource DOT com
+ *
+ * Sonar is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * Sonar is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Sonar; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
+ */
+package org.sonar.squid.api;
+
+public class AnalysisException extends RuntimeException {
+
+  public AnalysisException(String arg0, Throwable arg1) {
+    super(arg0, arg1);
+  }
+
+  public AnalysisException(String arg0) {
+    super(arg0);
+  }
+
+  public AnalysisException(Throwable arg0) {
+    super(arg0);
+  }
+
+}
diff --git a/sonar-squid/src/main/java/org/sonar/squid/api/CheckMessage.java b/sonar-squid/src/main/java/org/sonar/squid/api/CheckMessage.java
new file mode 100644
index 00000000000..a8ce8ed8c17
--- /dev/null
+++ b/sonar-squid/src/main/java/org/sonar/squid/api/CheckMessage.java
@@ -0,0 +1,83 @@
+/*
+ * Sonar, open source software quality management tool.
+ * Copyright (C) 2009 SonarSource SA
+ * mailto:contact AT sonarsource DOT com
+ *
+ * Sonar is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * Sonar is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Sonar; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
+ */
+package org.sonar.squid.api;
+
+import java.text.MessageFormat;
+import java.util.Locale;
+
+import org.apache.commons.lang.builder.ToStringBuilder;
+import org.sonar.check.Message;
+
+public class CheckMessage implements Message {
+
+  private Integer line;
+  private SourceCode sourceCode;
+  private CodeCheck codeCheck;
+  private String defaultMessage;
+  private Object[] messageArguments;
+
+  public CheckMessage(CodeCheck rule, String message, Object... messageArguments) {
+    this.codeCheck = rule;
+    this.defaultMessage = message;
+    this.messageArguments = messageArguments;
+  }
+
+  public void setSourceCode(SourceCode sourceCode) {
+    this.sourceCode = sourceCode;
+  }
+
+  public SourceCode getSourceCode() {
+    return sourceCode;
+  }
+
+  public void setLine(int line) {
+    this.line = line;
+  }
+
+  public Integer getLine() {
+    return line;
+  }
+
+  public CodeCheck getChecker() {
+    return codeCheck;
+  }
+
+  public String getDefaultMessage() {
+    return defaultMessage;
+  }
+
+  public Object[] getMessageArguments() {
+    return messageArguments;
+  }
+
+  public String getText(Locale locale) {
+    return formatDefaultMessage();
+  }
+
+  @Override
+  public String toString() {
+    return new ToStringBuilder(this).append("source", sourceCode).append("check", codeCheck).append("msg", defaultMessage).append("line",
+        line).toString();
+  }
+
+  public String formatDefaultMessage() {
+    return MessageFormat.format(defaultMessage, messageArguments);
+  }
+}
diff --git a/sonar-squid/src/main/java/org/sonar/squid/api/CodeCheck.java b/sonar-squid/src/main/java/org/sonar/squid/api/CodeCheck.java
new file mode 100644
index 00000000000..ac7f2545ddb
--- /dev/null
+++ b/sonar-squid/src/main/java/org/sonar/squid/api/CodeCheck.java
@@ -0,0 +1,26 @@
+/*
+ * Sonar, open source software quality management tool.
+ * Copyright (C) 2009 SonarSource SA
+ * mailto:contact AT sonarsource DOT com
+ *
+ * Sonar is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * Sonar is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Sonar; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
+ */
+package org.sonar.squid.api;
+
+public interface CodeCheck extends CodeVisitor {
+
+  String getKey();
+
+}
diff --git a/sonar-squid/src/main/java/org/sonar/squid/api/CodeScanner.java b/sonar-squid/src/main/java/org/sonar/squid/api/CodeScanner.java
new file mode 100644
index 00000000000..c9d1e21dbd9
--- /dev/null
+++ b/sonar-squid/src/main/java/org/sonar/squid/api/CodeScanner.java
@@ -0,0 +1,39 @@
+/*
+ * Sonar, open source software quality management tool.
+ * Copyright (C) 2009 SonarSource SA
+ * mailto:contact AT sonarsource DOT com
+ *
+ * Sonar is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * Sonar is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Sonar; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
+ */
+package org.sonar.squid.api;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+
+public abstract class CodeScanner<VISITOR extends CodeVisitor> {
+
+  private List<VISITOR> visitors = new ArrayList<VISITOR>();
+
+  public abstract Collection<Class<? extends VISITOR>> getVisitorClasses();
+
+  public final void accept(VISITOR visitor) {
+    visitors.add(visitor);
+  }
+
+  public List<VISITOR> getVisitors() {
+    return visitors;
+  }
+}
\ No newline at end of file
diff --git a/sonar-squid/src/main/java/org/sonar/squid/api/CodeVisitor.java b/sonar-squid/src/main/java/org/sonar/squid/api/CodeVisitor.java
new file mode 100644
index 00000000000..82163bb2bac
--- /dev/null
+++ b/sonar-squid/src/main/java/org/sonar/squid/api/CodeVisitor.java
@@ -0,0 +1,24 @@
+/*
+ * Sonar, open source software quality management tool.
+ * Copyright (C) 2009 SonarSource SA
+ * mailto:contact AT sonarsource DOT com
+ *
+ * Sonar is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * Sonar is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Sonar; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
+ */
+package org.sonar.squid.api;
+
+public interface CodeVisitor {
+
+}
diff --git a/sonar-squid/src/main/java/org/sonar/squid/api/Query.java b/sonar-squid/src/main/java/org/sonar/squid/api/Query.java
new file mode 100644
index 00000000000..56e5af24c28
--- /dev/null
+++ b/sonar-squid/src/main/java/org/sonar/squid/api/Query.java
@@ -0,0 +1,26 @@
+/*
+ * Sonar, open source software quality management tool.
+ * Copyright (C) 2009 SonarSource SA
+ * mailto:contact AT sonarsource DOT com
+ *
+ * Sonar is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * Sonar is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Sonar; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
+ */
+package org.sonar.squid.api;
+
+
+public interface Query {
+
+  boolean match(SourceCode unit);
+}
diff --git a/sonar-squid/src/main/java/org/sonar/squid/api/SourceClass.java b/sonar-squid/src/main/java/org/sonar/squid/api/SourceClass.java
new file mode 100644
index 00000000000..20287f283f1
--- /dev/null
+++ b/sonar-squid/src/main/java/org/sonar/squid/api/SourceClass.java
@@ -0,0 +1,31 @@
+/*
+ * Sonar, open source software quality management tool.
+ * Copyright (C) 2009 SonarSource SA
+ * mailto:contact AT sonarsource DOT com
+ *
+ * Sonar is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * Sonar is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Sonar; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
+ */
+package org.sonar.squid.api;
+
+public class SourceClass extends SourceCode {
+
+  public SourceClass(String key) {
+    super(key);
+  }
+
+  public SourceClass(String key, String className) {
+    super(key, className);
+  }
+}
diff --git a/sonar-squid/src/main/java/org/sonar/squid/api/SourceCode.java b/sonar-squid/src/main/java/org/sonar/squid/api/SourceCode.java
new file mode 100644
index 00000000000..0cedaf8bc03
--- /dev/null
+++ b/sonar-squid/src/main/java/org/sonar/squid/api/SourceCode.java
@@ -0,0 +1,275 @@
+/*
+ * Sonar, open source software quality management tool.
+ * Copyright (C) 2009 SonarSource SA
+ * mailto:contact AT sonarsource DOT com
+ *
+ * Sonar is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * Sonar is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Sonar; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
+ */
+package org.sonar.squid.api;
+
+import java.util.HashSet;
+import java.util.Set;
+import java.util.SortedSet;
+import java.util.TreeSet;
+
+import org.sonar.squid.measures.Measurable;
+import org.sonar.squid.measures.Measures;
+import org.sonar.squid.measures.Metric;
+import org.sonar.squid.measures.MetricDef;
+
+public abstract class SourceCode implements Measurable, Comparable<SourceCode> {
+
+  private final String name;
+  private Measures measures = new Measures();
+  private final String key;
+  private int startAtLine = -1;
+  private int endAtLine = -1;
+  private SourceCode parent;
+  private SortedSet<SourceCode> children;
+  private SourceCodeIndexer indexer;
+  private Set<CheckMessage> messages;
+
+  public SourceCode(String key) {
+    this(key, null);
+  }
+
+  public SourceCode(String key, String name) {
+    this.key = key;
+    this.name = name;
+  }
+
+  public String getKey() {
+    return key;
+  }
+
+  public int compareTo(SourceCode resource) {
+    return key.compareTo(resource.getKey());
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public final void setSourceCodeIndexer(SourceCodeIndexer indexer) {
+    this.indexer = indexer;
+  }
+
+  private void index(SourceCode sourceCode) {
+    if (indexer != null) {
+      indexer.index(sourceCode);
+    }
+  }
+
+  @Override
+  public boolean equals(Object obj) {
+    return (obj instanceof SourceCode) && key.equals(((SourceCode) obj).key);
+  }
+
+  @Override
+  public int hashCode() {
+    return key.hashCode();
+  }
+
+  @Override
+  public String toString() {
+    return getKey();
+  }
+
+  public boolean isType(Class<? extends SourceCode> resourceType) {
+    return this.getClass() == resourceType;
+  }
+
+  /**
+   * {@inheritDoc}
+   */
+  public int getInt(MetricDef metric) {
+    return (int) getMeasure(metric);
+  }
+
+  /**
+   * @deprecated since 2.1. It's replaced by getInt(MetricDef). It's still defined for binary compatibility.
+   */
+  @Deprecated
+  public int getInt(Metric metric) {
+    return (int) getMeasure(metric);
+  }
+
+  /**
+   * {@inheritDoc}
+   */
+  public double getDouble(MetricDef metric) {
+    return getMeasure(metric);
+  }
+
+  /**
+   * @deprecated since 2.1. It's replaced by getDouble(MetricDef). It's still defined for binary compatibility.
+   */
+  @Deprecated
+  public double getDouble(Metric metric) {
+    return getMeasure(metric);
+  }
+
+  public void add(MetricDef metric, SourceCode child) {
+    add(metric, child.getMeasure(metric));
+  }
+
+  public void add(MetricDef metric, double value) {
+    setMeasure(metric, getMeasure(metric) + value);
+  }
+
+  public void addData(MetricDef metric, Object data) {
+    measures.setData(metric, data);
+  }
+
+  public Object getData(MetricDef metric) {
+    return measures.getData(metric);
+  }
+
+  /**
+   * @deprecated since 2.1. It's replaced by getData(MetricDef). It's still defined for binary compatibility.
+   */
+  public Object getData(Metric metric) {
+    return measures.getData(metric);
+  }
+
+  private double getMeasure(MetricDef metric) {
+    if (metric.isCalculatedMetric()) {
+      return metric.getCalculatedMetricFormula().calculate(this);
+    }
+    return measures.getValue(metric);
+  }
+
+  /**
+   * {@inheritDoc}
+   */
+  public void setMeasure(MetricDef metric, double measure) {
+    if (metric.isCalculatedMetric()) {
+      throw new IllegalStateException("It's not allowed to set the value of a calculated metric : " + metric.getName());
+    }
+    measures.setValue(metric, measure);
+  }
+
+  /**
+   * {@inheritDoc}
+   */
+  public void setMeasure(MetricDef metric, int measure) {
+    setMeasure(metric, (double) measure);
+  }
+
+  public void removeMeasure(MetricDef metric) {
+    measures.removeMeasure(metric);
+  }
+
+  public void setStartAtLine(int startAtLine) {
+    this.startAtLine = startAtLine;
+    this.endAtLine = startAtLine;
+  }
+
+  public void setEndAtLine(int endAtLine) {
+    this.endAtLine = endAtLine;
+  }
+
+  public int getStartAtLine() {
+    return startAtLine;
+  }
+
+  public int getEndAtLine() {
+    return endAtLine;
+  }
+
+  public SourceCode addChild(SourceCode sourceCode) {
+    if (children == null) {
+      children = new TreeSet<SourceCode>();
+    }
+    sourceCode.setParent(this);
+    if ( !children.contains(sourceCode)) {
+      children.add(sourceCode);
+      index(sourceCode);
+    }
+    return this;
+  }
+
+  public <SOURCECODE extends SourceCode> SOURCECODE getParent(Class<SOURCECODE> sourceCode) {
+    if (parent == null) {
+      return null;
+    }
+    if (parent.getClass().equals(sourceCode)) {
+      return (SOURCECODE) parent;
+    }
+    return parent.getParent(sourceCode);
+  }
+
+  public void log(CheckMessage message) {
+    message.setSourceCode(this);
+    getCheckMessages().add(message);
+  }
+
+  public Set<CheckMessage> getCheckMessages() {
+    if (messages == null) {
+      messages = new HashSet<CheckMessage>();
+    }
+    return messages;
+  }
+
+  public boolean hasCheckMessages() {
+    return messages != null && !messages.isEmpty();
+  }
+
+  public SourceCode getFirstChild() {
+    return !children.isEmpty() ? children.first() : null;
+  }
+
+  public SourceCode getLastChild() {
+    return !children.isEmpty() ? children.last() : null;
+  }
+
+  private void setParent(SourceCode parent) {
+    this.parent = parent;
+  }
+
+  public SourceCode getParent() {
+    return parent;
+  }
+
+  public Set<SourceCode> getChildren() {
+    return children;
+  }
+
+  public boolean hasChild(SourceCode squidUnit) {
+    if ( !hasChildren()) {
+      return false;
+    }
+    if (children.contains(squidUnit)) {
+      return true;
+    }
+    for (SourceCode child : children) {
+      if (child.hasChild(squidUnit)) {
+        return true;
+      }
+    }
+    return false;
+  }
+
+  protected boolean hasChildren() {
+    return children != null && children.size() != 0;
+  }
+
+  public boolean hasAmongParents(SourceCode expectedParent) {
+    if (parent == null) {
+      return false;
+    }
+    return parent.equals(expectedParent) || parent.hasAmongParents(expectedParent);
+  }
+}
diff --git a/sonar-squid/src/main/java/org/sonar/squid/api/SourceCodeEdge.java b/sonar-squid/src/main/java/org/sonar/squid/api/SourceCodeEdge.java
new file mode 100644
index 00000000000..37bf771e349
--- /dev/null
+++ b/sonar-squid/src/main/java/org/sonar/squid/api/SourceCodeEdge.java
@@ -0,0 +1,139 @@
+/*
+ * Sonar, open source software quality management tool.
+ * Copyright (C) 2009 SonarSource SA
+ * mailto:contact AT sonarsource DOT com
+ *
+ * Sonar is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * Sonar is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Sonar; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
+ */
+package org.sonar.squid.api;
+
+import java.util.HashSet;
+import java.util.Set;
+
+import org.sonar.graph.Edge;
+
+public class SourceCodeEdge implements Edge<SourceCode> {
+
+  private final SourceCode from;
+  private final SourceCode to;
+  private final SourceCodeEdgeUsage usage;
+  private Set<SourceCodeEdge> rootEdges;
+  private Set<SourceCode> rootFromNodes;
+  private Set<SourceCode> rootToNodes;
+  private final int hashcode;
+  private SourceCodeEdge parent;
+
+  public SourceCodeEdge(SourceCode from, SourceCode to, SourceCodeEdgeUsage link) {
+    this(from, to, link, null);
+  }
+
+  public SourceCodeEdge(SourceCode from, SourceCode to, SourceCodeEdgeUsage usage, SourceCodeEdge rootEdge) {
+    this.hashcode = from.hashCode() * 31 + to.hashCode() + usage.hashCode(); //NOSONAR even if this basic algorithm could be improved
+    this.from = from;
+    this.to = to;
+    this.usage = usage;
+    addRootEdge(rootEdge);
+  }
+
+  public SourceCode getFrom() {
+    return from;
+  }
+
+  public SourceCode getTo() {
+    return to;
+  }
+
+  public SourceCodeEdgeUsage getUsage() {
+    return usage;
+  }
+
+  private boolean noRoots() {
+    return rootEdges == null;
+  }
+
+  public boolean hasAnEdgeFromRootNode(SourceCode rootFromNode) {
+    if (noRoots()) {
+      return false;
+    }
+    return rootFromNodes.contains(rootFromNode);
+  }
+
+  public boolean hasAnEdgeToRootNode(SourceCode rootToNode) {
+    if (noRoots()) {
+      return false;
+    }
+    return rootToNodes.contains(rootToNode);
+  }
+
+  public Set<SourceCodeEdge> getRootEdges() {
+    return rootEdges;
+  }
+
+  public int getNumberOfRootFromNodes() {
+    if (noRoots()) {
+      return 0;
+    }
+    return rootFromNodes.size();
+  }
+
+  public final void addRootEdge(SourceCodeEdge rootRelationShip) {
+    if (noRoots()) {
+      rootEdges = new HashSet<SourceCodeEdge>();
+      rootFromNodes = new HashSet<SourceCode>();
+      rootToNodes = new HashSet<SourceCode>();
+    }
+    if (rootRelationShip != null) {
+      rootEdges.add(rootRelationShip);
+      rootFromNodes.add(rootRelationShip.getFrom());
+      rootToNodes.add(rootRelationShip.getTo());
+      rootRelationShip.setParent(this);
+    }
+  }
+
+  public int getWeight() {
+    if (noRoots()) {
+      return 0;
+    }
+    return rootEdges.size();
+  }
+
+  public SourceCodeEdge getParent() {
+    return parent;
+  }
+
+  public SourceCodeEdge setParent(SourceCodeEdge parent) {
+    this.parent = parent;
+    return this;
+  }
+
+  @Override
+  public boolean equals(Object obj) {
+    if ( !(obj instanceof SourceCodeEdge) || this.hashCode() != obj.hashCode()) {
+      return false;
+    }
+    SourceCodeEdge edge = (SourceCodeEdge) obj;
+    return from.equals(edge.from) && to.equals(edge.to);
+  }
+
+  @Override
+  public int hashCode() {
+    return hashcode;
+  }
+
+  @Override
+  public String toString() {
+    return "from : " + from + ", to : " + to;
+  }
+}
diff --git a/sonar-squid/src/main/java/org/sonar/squid/api/SourceCodeEdgeUsage.java b/sonar-squid/src/main/java/org/sonar/squid/api/SourceCodeEdgeUsage.java
new file mode 100644
index 00000000000..9d4b311c580
--- /dev/null
+++ b/sonar-squid/src/main/java/org/sonar/squid/api/SourceCodeEdgeUsage.java
@@ -0,0 +1,55 @@
+/*
+ * Sonar, open source software quality management tool.
+ * Copyright (C) 2009 SonarSource SA
+ * mailto:contact AT sonarsource DOT com
+ *
+ * Sonar is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * Sonar is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Sonar; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
+ */
+package org.sonar.squid.api;
+
+public enum SourceCodeEdgeUsage {
+  /**
+   * Example: class A extends class B
+   */
+  EXTENDS,
+
+  /**
+   * Example: class A implements an interface B
+   */
+  IMPLEMENTS,
+
+  /**
+   * Examples:
+   * <ul>
+   * <li>method A returns an object of type B</li>
+   * <li>method A declares a parameter of type B</li>
+   * <li>method A throws an exception of type B</li>
+   * <li>method A catch an exception of type B</li>
+   * </ul>
+   */
+  USES,
+
+  CALLS_FIELD, CALLS_METHOD,
+
+  /**
+   * Example: class A declares a field of type B
+   */
+  CONTAINS,
+
+  /**
+   * Unknown type
+   */
+  NO_LINK
+}
diff --git a/sonar-squid/src/main/java/org/sonar/squid/api/SourceCodeIndexer.java b/sonar-squid/src/main/java/org/sonar/squid/api/SourceCodeIndexer.java
new file mode 100644
index 00000000000..7eb78e6e74b
--- /dev/null
+++ b/sonar-squid/src/main/java/org/sonar/squid/api/SourceCodeIndexer.java
@@ -0,0 +1,25 @@
+/*
+ * Sonar, open source software quality management tool.
+ * Copyright (C) 2009 SonarSource SA
+ * mailto:contact AT sonarsource DOT com
+ *
+ * Sonar is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * Sonar is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Sonar; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
+ */
+package org.sonar.squid.api;
+
+public interface SourceCodeIndexer {
+
+  void index(SourceCode sourceCode);
+}
diff --git a/sonar-squid/src/main/java/org/sonar/squid/api/SourceCodeSearchEngine.java b/sonar-squid/src/main/java/org/sonar/squid/api/SourceCodeSearchEngine.java
new file mode 100644
index 00000000000..f89afac0e85
--- /dev/null
+++ b/sonar-squid/src/main/java/org/sonar/squid/api/SourceCodeSearchEngine.java
@@ -0,0 +1,30 @@
+/*
+ * Sonar, open source software quality management tool.
+ * Copyright (C) 2009 SonarSource SA
+ * mailto:contact AT sonarsource DOT com
+ *
+ * Sonar is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * Sonar is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Sonar; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
+ */
+package org.sonar.squid.api;
+
+import java.util.Collection;
+
+
+public interface SourceCodeSearchEngine {
+
+  SourceCode search(String key);
+
+  Collection<SourceCode> search(Query... query);
+}
diff --git a/sonar-squid/src/main/java/org/sonar/squid/api/SourceCodeTreeDecorator.java b/sonar-squid/src/main/java/org/sonar/squid/api/SourceCodeTreeDecorator.java
new file mode 100644
index 00000000000..933ab70708d
--- /dev/null
+++ b/sonar-squid/src/main/java/org/sonar/squid/api/SourceCodeTreeDecorator.java
@@ -0,0 +1,55 @@
+/*
+ * Sonar, open source software quality management tool.
+ * Copyright (C) 2009 SonarSource SA
+ * mailto:contact AT sonarsource DOT com
+ *
+ * Sonar is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * Sonar is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Sonar; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
+ */
+package org.sonar.squid.api;
+
+import org.sonar.squid.measures.MetricDef;
+
+public class SourceCodeTreeDecorator {
+
+  private final SourceProject project;
+
+  public SourceCodeTreeDecorator(SourceProject project) {
+    this.project = project;
+  }
+
+  public void decorateWith(MetricDef... metrics) {
+    decorateWith(project, metrics);
+  }
+
+  private void decorateWith(SourceCode sourceCode, MetricDef... metrics) {
+    if (sourceCode.hasChildren()) {
+      for (SourceCode child : sourceCode.getChildren()) {
+        decorateWith(child, metrics);
+      }
+    }
+    for (MetricDef metric : metrics) {
+      if ( !metric.aggregateIfThereIsAlreadyAValue() && sourceCode.getDouble(metric) != 0) {
+        continue;
+      }
+      if (sourceCode.hasChildren()) {
+        for (SourceCode child : sourceCode.getChildren()) {
+          if ( !metric.isCalculatedMetric() && metric.isThereAggregationFormula()) {
+            sourceCode.add(metric, child);
+          }
+        }
+      }
+    }
+  }
+}
diff --git a/sonar-squid/src/main/java/org/sonar/squid/api/SourceFile.java b/sonar-squid/src/main/java/org/sonar/squid/api/SourceFile.java
new file mode 100644
index 00000000000..bd0cb5b52a7
--- /dev/null
+++ b/sonar-squid/src/main/java/org/sonar/squid/api/SourceFile.java
@@ -0,0 +1,54 @@
+/*
+ * Sonar, open source software quality management tool.
+ * Copyright (C) 2009 SonarSource SA
+ * mailto:contact AT sonarsource DOT com
+ *
+ * Sonar is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * Sonar is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Sonar; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
+ */
+package org.sonar.squid.api;
+
+import java.util.HashSet;
+import java.util.Set;
+
+public class SourceFile extends SourceCode {
+
+  private Set<Integer> noSonarTagLines = new HashSet<Integer>();
+
+  public SourceFile(String key) {
+    super(key);
+    setStartAtLine(1);
+  }
+
+  public SourceFile(String key, String fileName) {
+    super(key, fileName);
+    setStartAtLine(1);
+  }
+
+  public Set<Integer> getNoSonarTagLines() {
+    return noSonarTagLines;
+  }
+
+  public boolean hasNoSonarTagAtLine(int lineNumber) {
+    return noSonarTagLines.contains(lineNumber);
+  }
+
+  public void addNoSonarTagLines(Set<Integer> noSonarTagLines) {
+    this.noSonarTagLines.addAll(noSonarTagLines);
+  }
+
+  public void addNoSonarTagLine(int line) {
+    noSonarTagLines.add(line);
+  }
+}
diff --git a/sonar-squid/src/main/java/org/sonar/squid/api/SourceFunction.java b/sonar-squid/src/main/java/org/sonar/squid/api/SourceFunction.java
new file mode 100644
index 00000000000..5a0805d9a62
--- /dev/null
+++ b/sonar-squid/src/main/java/org/sonar/squid/api/SourceFunction.java
@@ -0,0 +1,32 @@
+/*
+ * Sonar, open source software quality management tool.
+ * Copyright (C) 2009 SonarSource SA
+ * mailto:contact AT sonarsource DOT com
+ *
+ * Sonar is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * Sonar is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Sonar; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
+ */
+package org.sonar.squid.api;
+
+public class SourceFunction extends SourceCode {
+
+  public SourceFunction(String key) {
+    super(key);
+  }
+
+  public SourceFunction(SourceFile sourceFile, String functionSignature, int startAtLine) {
+    super(sourceFile.getKey() + "#" + functionSignature, functionSignature);
+    setStartAtLine(startAtLine);
+  }
+}
diff --git a/sonar-squid/src/main/java/org/sonar/squid/api/SourceMethod.java b/sonar-squid/src/main/java/org/sonar/squid/api/SourceMethod.java
new file mode 100644
index 00000000000..0378f655da4
--- /dev/null
+++ b/sonar-squid/src/main/java/org/sonar/squid/api/SourceMethod.java
@@ -0,0 +1,38 @@
+/*
+ * Sonar, open source software quality management tool.
+ * Copyright (C) 2009 SonarSource SA
+ * mailto:contact AT sonarsource DOT com
+ *
+ * Sonar is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * Sonar is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Sonar; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
+ */
+package org.sonar.squid.api;
+
+import org.sonar.squid.measures.Metric;
+
+public class SourceMethod extends SourceCode {
+
+  public SourceMethod(String key) {
+    super(key);
+  }
+
+  public SourceMethod(SourceClass peekParentClass, String methodSignature, int startAtLine) {
+    super(peekParentClass.getKey() + "#" + methodSignature, methodSignature);
+    setStartAtLine(startAtLine);
+  }
+
+  public boolean isAccessor() {
+    return getInt(Metric.ACCESSORS) != 0;
+  }
+}
diff --git a/sonar-squid/src/main/java/org/sonar/squid/api/SourcePackage.java b/sonar-squid/src/main/java/org/sonar/squid/api/SourcePackage.java
new file mode 100644
index 00000000000..e7c025eb94e
--- /dev/null
+++ b/sonar-squid/src/main/java/org/sonar/squid/api/SourcePackage.java
@@ -0,0 +1,27 @@
+/*
+ * Sonar, open source software quality management tool.
+ * Copyright (C) 2009 SonarSource SA
+ * mailto:contact AT sonarsource DOT com
+ *
+ * Sonar is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * Sonar is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Sonar; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
+ */
+package org.sonar.squid.api;
+
+public class SourcePackage extends SourceCode {
+
+  public SourcePackage(String key) {
+    super(key);
+  }
+}
diff --git a/sonar-squid/src/main/java/org/sonar/squid/api/SourceProject.java b/sonar-squid/src/main/java/org/sonar/squid/api/SourceProject.java
new file mode 100644
index 00000000000..7d93421de12
--- /dev/null
+++ b/sonar-squid/src/main/java/org/sonar/squid/api/SourceProject.java
@@ -0,0 +1,28 @@
+/*
+ * Sonar, open source software quality management tool.
+ * Copyright (C) 2009 SonarSource SA
+ * mailto:contact AT sonarsource DOT com
+ *
+ * Sonar is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * Sonar is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Sonar; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
+ */
+package org.sonar.squid.api;
+
+public class SourceProject extends SourceCode {
+
+  public SourceProject(String key) {
+    super(key);
+  }
+
+}
diff --git a/sonar-squid/src/main/java/org/sonar/squid/api/SquidConfiguration.java b/sonar-squid/src/main/java/org/sonar/squid/api/SquidConfiguration.java
new file mode 100644
index 00000000000..30321f81504
--- /dev/null
+++ b/sonar-squid/src/main/java/org/sonar/squid/api/SquidConfiguration.java
@@ -0,0 +1,39 @@
+/*
+ * Sonar, open source software quality management tool.
+ * Copyright (C) 2009 SonarSource SA
+ * mailto:contact AT sonarsource DOT com
+ *
+ * Sonar is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * Sonar is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Sonar; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
+ */
+package org.sonar.squid.api;
+
+import java.nio.charset.Charset;
+
+public class SquidConfiguration {
+
+  private Charset charset = Charset.defaultCharset();
+
+  public SquidConfiguration() {
+  }
+
+  public SquidConfiguration(Charset charset) {
+    this.charset = charset;
+  }
+
+  public Charset getCharset() {
+    return charset;
+  }
+
+}
\ No newline at end of file
diff --git a/sonar-squid/src/main/java/org/sonar/squid/indexer/QueryByMeasure.java b/sonar-squid/src/main/java/org/sonar/squid/indexer/QueryByMeasure.java
new file mode 100644
index 00000000000..f6b1cafec2c
--- /dev/null
+++ b/sonar-squid/src/main/java/org/sonar/squid/indexer/QueryByMeasure.java
@@ -0,0 +1,65 @@
+/*
+ * Sonar, open source software quality management tool.
+ * Copyright (C) 2009 SonarSource SA
+ * mailto:contact AT sonarsource DOT com
+ *
+ * Sonar is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * Sonar is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Sonar; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
+ */
+package org.sonar.squid.indexer;
+
+import org.sonar.squid.api.Query;
+import org.sonar.squid.api.SourceCode;
+import org.sonar.squid.measures.Metric;
+import org.sonar.squid.measures.MetricDef;
+
+public class QueryByMeasure implements Query {
+
+  private final MetricDef metric;
+  private final Operator operator;
+  private final double value;
+
+  public enum Operator {
+    GREATER_THAN, EQUALS, GREATER_THAN_EQUALS, LESS_THAN, LESS_THAN_EQUALS
+  }
+  
+  @Deprecated
+  public QueryByMeasure(Metric metric, Operator operator, double value) {
+    this((MetricDef)metric, operator, value);
+  }
+
+  public QueryByMeasure(MetricDef metric, Operator operator, double value) {
+    this.metric = metric;
+    this.operator = operator;
+    this.value = value;
+  }
+
+  public boolean match(SourceCode unit) {
+    switch (operator) {
+      case EQUALS:
+        return unit.getDouble(metric) == value;
+      case GREATER_THAN:
+        return unit.getDouble(metric) > value;
+      case GREATER_THAN_EQUALS:
+        return unit.getDouble(metric) >= value;
+      case LESS_THAN_EQUALS:
+        return unit.getDouble(metric) <= value;
+      case LESS_THAN:
+        return unit.getDouble(metric) < value;
+      default:
+        throw new IllegalStateException("The operator value '" + operator + "' is unknown.");
+    }
+  }
+
+}
diff --git a/sonar-squid/src/main/java/org/sonar/squid/indexer/QueryByName.java b/sonar-squid/src/main/java/org/sonar/squid/indexer/QueryByName.java
new file mode 100644
index 00000000000..fb2a424b4f0
--- /dev/null
+++ b/sonar-squid/src/main/java/org/sonar/squid/indexer/QueryByName.java
@@ -0,0 +1,65 @@
+/*
+ * Sonar, open source software quality management tool.
+ * Copyright (C) 2009 SonarSource SA
+ * mailto:contact AT sonarsource DOT com
+ *
+ * Sonar is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * Sonar is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Sonar; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
+ */
+package org.sonar.squid.indexer;
+
+import org.sonar.squid.api.Query;
+import org.sonar.squid.api.SourceCode;
+
+public class QueryByName implements Query {
+
+  private final String resourceName;
+
+  public QueryByName(String resourceName) {
+    if (resourceName == null) {
+      throw new IllegalStateException("The name can't be null !");
+    }
+    this.resourceName = resourceName;
+  }
+
+  public boolean match(SourceCode unit) {
+    if(unit.getName() != null) {
+      return unit.getName().equals(resourceName);
+    }
+    return false;
+  }
+
+  @Override
+  public boolean equals(Object o) {
+    if (this == o) {
+      return true;
+    }
+    if ( !(o instanceof QueryByName)) {
+      return false;
+    }
+
+    QueryByName that = (QueryByName) o;
+
+    if (resourceName != null ? !resourceName.equals(that.resourceName) : that.resourceName != null) {
+      return false;
+    }
+
+    return true;
+  }
+
+  @Override
+  public int hashCode() {
+    return resourceName.hashCode();
+  }
+}
diff --git a/sonar-squid/src/main/java/org/sonar/squid/indexer/QueryByParent.java b/sonar-squid/src/main/java/org/sonar/squid/indexer/QueryByParent.java
new file mode 100644
index 00000000000..a9a155084c1
--- /dev/null
+++ b/sonar-squid/src/main/java/org/sonar/squid/indexer/QueryByParent.java
@@ -0,0 +1,36 @@
+/*
+ * Sonar, open source software quality management tool.
+ * Copyright (C) 2009 SonarSource SA
+ * mailto:contact AT sonarsource DOT com
+ *
+ * Sonar is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * Sonar is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Sonar; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
+ */
+package org.sonar.squid.indexer;
+
+import org.sonar.squid.api.Query;
+import org.sonar.squid.api.SourceCode;
+
+public class QueryByParent implements Query {
+
+  private final SourceCode parent;
+
+  public QueryByParent(SourceCode parent) {
+    this.parent = parent;
+  }
+
+  public boolean match(SourceCode unit) {
+    return unit.hasAmongParents(parent);
+  }
+}
diff --git a/sonar-squid/src/main/java/org/sonar/squid/indexer/QueryByType.java b/sonar-squid/src/main/java/org/sonar/squid/indexer/QueryByType.java
new file mode 100644
index 00000000000..de52003613d
--- /dev/null
+++ b/sonar-squid/src/main/java/org/sonar/squid/indexer/QueryByType.java
@@ -0,0 +1,62 @@
+/*
+ * Sonar, open source software quality management tool.
+ * Copyright (C) 2009 SonarSource SA
+ * mailto:contact AT sonarsource DOT com
+ *
+ * Sonar is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * Sonar is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Sonar; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
+ */
+package org.sonar.squid.indexer;
+
+import org.sonar.squid.api.Query;
+import org.sonar.squid.api.SourceCode;
+
+public class QueryByType implements Query {
+
+  private final Class<? extends SourceCode> resourceType;
+
+  public QueryByType(Class<? extends SourceCode> resourceType) {
+    if (resourceType == null) {
+      throw new IllegalStateException("The type of resource can't be null !");
+    }
+    this.resourceType = resourceType;
+  }
+
+  public boolean match(SourceCode unit) {
+    return unit.isType(resourceType);
+  }
+
+  @Override
+  public boolean equals(Object o) {
+    if (this == o) {
+      return true;
+    }
+    if (!(o instanceof QueryByType)) {
+      return false;
+    }
+
+    QueryByType that = (QueryByType) o;
+
+    if (resourceType != null ? !resourceType.equals(that.resourceType) : that.resourceType != null) {
+      return false;
+    }
+
+    return true;
+  }
+
+  @Override
+  public int hashCode() {
+    return resourceType != null ? resourceType.hashCode() : 0;
+  }
+}
diff --git a/sonar-squid/src/main/java/org/sonar/squid/indexer/SquidIndex.java b/sonar-squid/src/main/java/org/sonar/squid/indexer/SquidIndex.java
new file mode 100644
index 00000000000..10632ad7f9e
--- /dev/null
+++ b/sonar-squid/src/main/java/org/sonar/squid/indexer/SquidIndex.java
@@ -0,0 +1,66 @@
+/*
+ * Sonar, open source software quality management tool.
+ * Copyright (C) 2009 SonarSource SA
+ * mailto:contact AT sonarsource DOT com
+ *
+ * Sonar is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * Sonar is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Sonar; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
+ */
+package org.sonar.squid.indexer;
+
+import java.util.Collection;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Set;
+import java.util.TreeMap;
+
+import org.sonar.squid.api.Query;
+import org.sonar.squid.api.SourceCode;
+import org.sonar.squid.api.SourceCodeIndexer;
+import org.sonar.squid.api.SourceCodeSearchEngine;
+
+public class SquidIndex implements SourceCodeIndexer, SourceCodeSearchEngine {
+
+  private Map<String, SourceCode> index = new TreeMap<String, SourceCode>();
+
+  public Collection<SourceCode> search(Query... query) {
+    Set<SourceCode> result = new HashSet<SourceCode>();
+    for (SourceCode unit : index.values()) {
+      if (isSquidUnitMatchQueries(unit, query)) {
+        result.add(unit);
+      }
+    }
+    return result;
+  }
+
+  private boolean isSquidUnitMatchQueries(SourceCode unit, Query... queries) {
+    boolean match;
+    for (Query query : queries) {
+      match = query.match(unit);
+      if (!match) {
+        return false;
+      }
+    }
+    return true;
+  }
+
+  public SourceCode search(String key) {
+    return index.get(key);
+  }
+
+  public void index(SourceCode sourceCode) {
+    sourceCode.setSourceCodeIndexer(this);
+    index.put(sourceCode.getKey(), sourceCode);
+  }
+}
diff --git a/sonar-squid/src/main/java/org/sonar/squid/math/MeasuresDistribution.java b/sonar-squid/src/main/java/org/sonar/squid/math/MeasuresDistribution.java
new file mode 100644
index 00000000000..b5b120a7e09
--- /dev/null
+++ b/sonar-squid/src/main/java/org/sonar/squid/math/MeasuresDistribution.java
@@ -0,0 +1,52 @@
+/*
+ * Sonar, open source software quality management tool.
+ * Copyright (C) 2009 SonarSource SA
+ * mailto:contact AT sonarsource DOT com
+ *
+ * Sonar is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * Sonar is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Sonar; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
+ */
+package org.sonar.squid.math;
+
+import java.util.Collection;
+import java.util.Map;
+import java.util.TreeMap;
+
+import org.sonar.squid.api.SourceCode;
+import org.sonar.squid.measures.MetricDef;
+
+public class MeasuresDistribution {
+
+  private final Collection<SourceCode> units;
+
+  public MeasuresDistribution(Collection<SourceCode> units) {
+    this.units = units;
+  }
+
+  public Map<Integer, Integer> distributeAccordingTo(MetricDef metric, int... thresholds) {
+    Map<Integer, Integer> result = new TreeMap<Integer, Integer>();
+    for (int threshold : thresholds) {
+      result.put(threshold, 0);
+    }
+    for (SourceCode unit : units) {
+      for (int index = thresholds.length - 1; index >= 0; index--) {
+        if (unit.getDouble(metric) >= thresholds[index]) {
+          result.put(thresholds[index], result.get(thresholds[index]) + 1);
+          break;
+        }
+      }
+    }
+    return result;
+  }
+}
diff --git a/sonar-squid/src/main/java/org/sonar/squid/measures/AbstractnessFormula.java b/sonar-squid/src/main/java/org/sonar/squid/measures/AbstractnessFormula.java
new file mode 100644
index 00000000000..23c1c7377a3
--- /dev/null
+++ b/sonar-squid/src/main/java/org/sonar/squid/measures/AbstractnessFormula.java
@@ -0,0 +1,31 @@
+/*
+ * Sonar, open source software quality management tool.
+ * Copyright (C) 2009 SonarSource SA
+ * mailto:contact AT sonarsource DOT com
+ *
+ * Sonar is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * Sonar is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Sonar; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
+ */
+package org.sonar.squid.measures;
+
+public class AbstractnessFormula implements CalculatedMetricFormula {
+
+  public double calculate(Measurable measurable) {
+    if (measurable.getDouble(Metric.CLASSES) == 0) {
+      return 0;
+    }
+    return (measurable.getDouble(Metric.ABSTRACT_CLASSES) + measurable.getDouble(Metric.INTERFACES)) / measurable.getDouble(Metric.CLASSES);
+  }
+
+}
diff --git a/sonar-squid/src/main/java/org/sonar/squid/measures/AggregationFormula.java b/sonar-squid/src/main/java/org/sonar/squid/measures/AggregationFormula.java
new file mode 100644
index 00000000000..88b9dcb3d8c
--- /dev/null
+++ b/sonar-squid/src/main/java/org/sonar/squid/measures/AggregationFormula.java
@@ -0,0 +1,28 @@
+/*
+ * Sonar, open source software quality management tool.
+ * Copyright (C) 2009 SonarSource SA
+ * mailto:contact AT sonarsource DOT com
+ *
+ * Sonar is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * Sonar is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Sonar; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
+ */
+package org.sonar.squid.measures;
+
+import java.util.Collection;
+
+public interface AggregationFormula {
+
+  double aggregate(MetricDef metric, Collection<Measurable> measurables);
+
+}
diff --git a/sonar-squid/src/main/java/org/sonar/squid/measures/CalculatedMetricFormula.java b/sonar-squid/src/main/java/org/sonar/squid/measures/CalculatedMetricFormula.java
new file mode 100644
index 00000000000..a4880c858d8
--- /dev/null
+++ b/sonar-squid/src/main/java/org/sonar/squid/measures/CalculatedMetricFormula.java
@@ -0,0 +1,26 @@
+/*
+ * Sonar, open source software quality management tool.
+ * Copyright (C) 2009 SonarSource SA
+ * mailto:contact AT sonarsource DOT com
+ *
+ * Sonar is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * Sonar is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Sonar; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
+ */
+package org.sonar.squid.measures;
+
+public interface CalculatedMetricFormula {
+
+  double calculate(Measurable measurable);
+
+}
diff --git a/sonar-squid/src/main/java/org/sonar/squid/measures/CommentLinesDensityFormula.java b/sonar-squid/src/main/java/org/sonar/squid/measures/CommentLinesDensityFormula.java
new file mode 100644
index 00000000000..56b5ab333f8
--- /dev/null
+++ b/sonar-squid/src/main/java/org/sonar/squid/measures/CommentLinesDensityFormula.java
@@ -0,0 +1,32 @@
+/*
+ * Sonar, open source software quality management tool.
+ * Copyright (C) 2009 SonarSource SA
+ * mailto:contact AT sonarsource DOT com
+ *
+ * Sonar is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * Sonar is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Sonar; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
+ */
+package org.sonar.squid.measures;
+
+public class CommentLinesDensityFormula implements CalculatedMetricFormula {
+
+  public double calculate(Measurable measurable) {
+    if ((measurable.getDouble(Metric.LINES_OF_CODE) + measurable.getDouble(Metric.COMMENT_LINES_WITHOUT_HEADER)) != 0) {
+      return measurable.getDouble(Metric.COMMENT_LINES_WITHOUT_HEADER)
+          / (measurable.getDouble(Metric.LINES_OF_CODE) + measurable.getDouble(Metric.COMMENT_LINES_WITHOUT_HEADER));
+    }
+    return 0;
+  }
+
+}
diff --git a/sonar-squid/src/main/java/org/sonar/squid/measures/CommentLinesWithoutHeaderFormula.java b/sonar-squid/src/main/java/org/sonar/squid/measures/CommentLinesWithoutHeaderFormula.java
new file mode 100644
index 00000000000..9bf67b92981
--- /dev/null
+++ b/sonar-squid/src/main/java/org/sonar/squid/measures/CommentLinesWithoutHeaderFormula.java
@@ -0,0 +1,28 @@
+/*
+ * Sonar, open source software quality management tool.
+ * Copyright (C) 2009 SonarSource SA
+ * mailto:contact AT sonarsource DOT com
+ *
+ * Sonar is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * Sonar is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Sonar; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
+ */
+package org.sonar.squid.measures;
+
+public class CommentLinesWithoutHeaderFormula implements CalculatedMetricFormula {
+
+  public double calculate(Measurable mesurable) {
+    return mesurable.getInt(Metric.COMMENT_LINES) - mesurable.getInt(Metric.HEADER_COMMENT_LINES);
+  }
+
+}
diff --git a/sonar-squid/src/main/java/org/sonar/squid/measures/DistanceFormula.java b/sonar-squid/src/main/java/org/sonar/squid/measures/DistanceFormula.java
new file mode 100644
index 00000000000..ea1ce094c98
--- /dev/null
+++ b/sonar-squid/src/main/java/org/sonar/squid/measures/DistanceFormula.java
@@ -0,0 +1,28 @@
+/*
+ * Sonar, open source software quality management tool.
+ * Copyright (C) 2009 SonarSource SA
+ * mailto:contact AT sonarsource DOT com
+ *
+ * Sonar is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * Sonar is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Sonar; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
+ */
+package org.sonar.squid.measures;
+
+public class DistanceFormula implements CalculatedMetricFormula {
+
+  public double calculate(Measurable measurable) {
+    return Math.abs(measurable.getDouble(Metric.ABSTRACTNESS) + measurable.getDouble(Metric.INSTABILITY) - 1);
+  }
+
+}
diff --git a/sonar-squid/src/main/java/org/sonar/squid/measures/InstabilityFormula.java b/sonar-squid/src/main/java/org/sonar/squid/measures/InstabilityFormula.java
new file mode 100644
index 00000000000..f4b7c984a31
--- /dev/null
+++ b/sonar-squid/src/main/java/org/sonar/squid/measures/InstabilityFormula.java
@@ -0,0 +1,31 @@
+/*
+ * Sonar, open source software quality management tool.
+ * Copyright (C) 2009 SonarSource SA
+ * mailto:contact AT sonarsource DOT com
+ *
+ * Sonar is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * Sonar is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Sonar; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
+ */
+package org.sonar.squid.measures;
+
+public class InstabilityFormula implements CalculatedMetricFormula {
+
+  public double calculate(Measurable measurable) {
+    if((measurable.getDouble(Metric.CA) + measurable.getDouble(Metric.CE)) == 0){
+      return 0;
+    }
+    return measurable.getDouble(Metric.CE) / (measurable.getDouble(Metric.CA) + measurable.getDouble(Metric.CE));
+  }
+
+}
diff --git a/sonar-squid/src/main/java/org/sonar/squid/measures/MeanAggregationFormula.java b/sonar-squid/src/main/java/org/sonar/squid/measures/MeanAggregationFormula.java
new file mode 100644
index 00000000000..b0f6c1d40af
--- /dev/null
+++ b/sonar-squid/src/main/java/org/sonar/squid/measures/MeanAggregationFormula.java
@@ -0,0 +1,34 @@
+/*
+ * Sonar, open source software quality management tool.
+ * Copyright (C) 2009 SonarSource SA
+ * mailto:contact AT sonarsource DOT com
+ *
+ * Sonar is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * Sonar is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Sonar; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
+ */
+package org.sonar.squid.measures;
+
+import java.util.Collection;
+
+public class MeanAggregationFormula implements AggregationFormula {
+
+  public double aggregate(MetricDef metric, Collection<Measurable> measurables) {
+    if (measurables.isEmpty()) {
+      return 0;
+    }
+    SumAggregationFormula sumFormula = new SumAggregationFormula();
+    return sumFormula.aggregate(metric, measurables) / (double) measurables.size();
+  }
+
+}
diff --git a/sonar-squid/src/main/java/org/sonar/squid/measures/Measurable.java b/sonar-squid/src/main/java/org/sonar/squid/measures/Measurable.java
new file mode 100644
index 00000000000..c04525279d1
--- /dev/null
+++ b/sonar-squid/src/main/java/org/sonar/squid/measures/Measurable.java
@@ -0,0 +1,32 @@
+/*
+ * Sonar, open source software quality management tool.
+ * Copyright (C) 2009 SonarSource SA
+ * mailto:contact AT sonarsource DOT com
+ *
+ * Sonar is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * Sonar is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Sonar; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
+ */
+package org.sonar.squid.measures;
+
+public interface Measurable<T extends MetricDef> {
+
+  double getDouble(T metric);
+
+  int getInt(T metric);
+
+  void setMeasure(T metric, double measure);
+
+  void setMeasure(T metric, int measure);
+
+}
diff --git a/sonar-squid/src/main/java/org/sonar/squid/measures/Measures.java b/sonar-squid/src/main/java/org/sonar/squid/measures/Measures.java
new file mode 100644
index 00000000000..12d2765ac76
--- /dev/null
+++ b/sonar-squid/src/main/java/org/sonar/squid/measures/Measures.java
@@ -0,0 +1,92 @@
+/*
+ * Sonar, open source software quality management tool.
+ * Copyright (C) 2009 SonarSource SA
+ * mailto:contact AT sonarsource DOT com
+ *
+ * Sonar is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * Sonar is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Sonar; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
+ */
+package org.sonar.squid.measures;
+
+import java.util.IdentityHashMap;
+import java.util.Map;
+
+public class Measures {
+
+  private Map<MetricDef, Measure> measures = new IdentityHashMap<MetricDef, Measure>();
+
+  public double getValue(MetricDef metric) {
+    Measure measure = measures.get(metric);
+    if (measure == null) {
+      return 0;
+    }
+    return measure.getValue();
+  }
+
+  public Object getData(MetricDef metric) {
+    Measure measure = measures.get(metric);
+    if (measure == null) {
+      return null;
+    }
+    return measure.getData();
+  }
+
+  public void setValue(MetricDef metric, double measure) {
+    getMeasureOrCreateIt(metric).setValue(measure);
+  }
+
+  public void setData(MetricDef metric, Object data) {
+    getMeasureOrCreateIt(metric).setData(data);
+  }
+
+  private Measure getMeasureOrCreateIt(MetricDef metric) {
+    Measure measure = measures.get(metric);
+    if (measure == null) {
+      measure = new Measure(0);
+      measures.put(metric, measure);
+    }
+    return measure;
+  }
+
+  public void removeMeasure(MetricDef metric) {
+    measures.remove(metric);
+  }
+
+  private static final class Measure {
+
+    private double value;
+    private Object data;
+
+    private Measure(double value) {
+      this.value = value;
+    }
+
+    private double getValue() {
+      return value;
+    }
+
+    private void setValue(double value) {
+      this.value = value;
+    }
+
+    private Object getData() {
+      return data;
+    }
+
+    private void setData(Object data) {
+      this.data = data;
+    }
+  }
+
+}
diff --git a/sonar-squid/src/main/java/org/sonar/squid/measures/Metric.java b/sonar-squid/src/main/java/org/sonar/squid/measures/Metric.java
new file mode 100644
index 00000000000..fefa8aeeeb9
--- /dev/null
+++ b/sonar-squid/src/main/java/org/sonar/squid/measures/Metric.java
@@ -0,0 +1,82 @@
+/*
+ * Sonar, open source software quality management tool.
+ * Copyright (C) 2009 SonarSource SA
+ * mailto:contact AT sonarsource DOT com
+ *
+ * Sonar is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * Sonar is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Sonar; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
+ */
+package org.sonar.squid.measures;
+
+public enum Metric implements MetricDef {
+
+  PACKAGES, CLASSES, ANONYMOUS_INNER_CLASSES, FILES, METHODS, CONSTRUCTORS, STATEMENTS, LINES(false), BLANK_LINES(false), COMMENT_LINES(
+      false), HEADER_COMMENT_LINES(false), COMMENTED_OUT_CODE_LINES(false), BRANCHES, PUBLIC_API, PUBLIC_DOC_API, ACCESSORS,
+  COMMENT_BLANK_LINES(false), LINES_OF_CODE(false), COMMENT_LINES_WITHOUT_HEADER(new CommentLinesWithoutHeaderFormula()),
+  PUBLIC_DOCUMENTED_API_DENSITY(new PublicDocumentedApiDensityFormula()), COMMENT_LINES_DENSITY(new CommentLinesDensityFormula()),
+  COMPLEXITY, INTERFACES, ABSTRACT_CLASSES, ABSTRACTNESS(new AbstractnessFormula()), CA(new NoAggregationFormula()), CE(
+      new NoAggregationFormula()), INSTABILITY(new InstabilityFormula()), DISTANCE(new DistanceFormula()), DIT(new NoAggregationFormula()),
+  RFC(new NoAggregationFormula()), NOC(new NoAggregationFormula()), LCOM4(new NoAggregationFormula()), LCOM4_BLOCKS;
+
+  private double initValue = 0;
+
+  private CalculatedMetricFormula formula = null;
+
+  private AggregationFormula aggregationFormula = new SumAggregationFormula();
+
+  private boolean aggregateIfThereIsAlreadyAValue = true;
+
+  Metric() {
+  }
+
+  Metric(boolean aggregateIfThereIsAlreadyAValue) {
+    this.aggregateIfThereIsAlreadyAValue = aggregateIfThereIsAlreadyAValue;
+  }
+
+  Metric(AggregationFormula aggregationFormula) {
+    this.aggregationFormula = aggregationFormula;
+  }
+
+  Metric(CalculatedMetricFormula formula) {
+    this.formula = formula;
+  }
+
+  public double getInitValue() {
+    return initValue;
+  }
+
+  public String getName() {
+    return name();
+  }
+
+  public boolean isCalculatedMetric() {
+    return formula != null;
+  }
+
+  public boolean aggregateIfThereIsAlreadyAValue() {
+    return aggregateIfThereIsAlreadyAValue;
+  }
+
+  public boolean isThereAggregationFormula() {
+    return !(aggregationFormula instanceof NoAggregationFormula);
+  }
+
+  public CalculatedMetricFormula getCalculatedMetricFormula() {
+    return formula;
+  }
+
+  public AggregationFormula getAggregationFormula() {
+    return aggregationFormula;
+  }
+}
diff --git a/sonar-squid/src/main/java/org/sonar/squid/measures/MetricDef.java b/sonar-squid/src/main/java/org/sonar/squid/measures/MetricDef.java
new file mode 100644
index 00000000000..03746b0c9e9
--- /dev/null
+++ b/sonar-squid/src/main/java/org/sonar/squid/measures/MetricDef.java
@@ -0,0 +1,37 @@
+/*
+ * Sonar, open source software quality management tool.
+ * Copyright (C) 2009 SonarSource SA
+ * mailto:contact AT sonarsource DOT com
+ *
+ * Sonar is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * Sonar is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Sonar; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
+ */
+package org.sonar.squid.measures;
+
+public interface MetricDef {
+
+  String getName();
+
+  double getInitValue();
+
+  boolean isCalculatedMetric();
+
+  boolean aggregateIfThereIsAlreadyAValue();
+
+  boolean isThereAggregationFormula();
+
+  CalculatedMetricFormula getCalculatedMetricFormula();
+
+  AggregationFormula getAggregationFormula();
+}
diff --git a/sonar-squid/src/main/java/org/sonar/squid/measures/NoAggregationFormula.java b/sonar-squid/src/main/java/org/sonar/squid/measures/NoAggregationFormula.java
new file mode 100644
index 00000000000..44609896f46
--- /dev/null
+++ b/sonar-squid/src/main/java/org/sonar/squid/measures/NoAggregationFormula.java
@@ -0,0 +1,30 @@
+/*
+ * Sonar, open source software quality management tool.
+ * Copyright (C) 2009 SonarSource SA
+ * mailto:contact AT sonarsource DOT com
+ *
+ * Sonar is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * Sonar is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Sonar; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
+ */
+package org.sonar.squid.measures;
+
+import java.util.Collection;
+
+public class NoAggregationFormula implements AggregationFormula {
+
+  public double aggregate(MetricDef metric, Collection<Measurable> measurables) {
+    return 0;
+  }
+
+}
diff --git a/sonar-squid/src/main/java/org/sonar/squid/measures/PublicDocumentedApiDensityFormula.java b/sonar-squid/src/main/java/org/sonar/squid/measures/PublicDocumentedApiDensityFormula.java
new file mode 100644
index 00000000000..a6ee6e906ea
--- /dev/null
+++ b/sonar-squid/src/main/java/org/sonar/squid/measures/PublicDocumentedApiDensityFormula.java
@@ -0,0 +1,31 @@
+/*
+ * Sonar, open source software quality management tool.
+ * Copyright (C) 2009 SonarSource SA
+ * mailto:contact AT sonarsource DOT com
+ *
+ * Sonar is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * Sonar is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Sonar; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
+ */
+package org.sonar.squid.measures;
+
+public class PublicDocumentedApiDensityFormula implements CalculatedMetricFormula {
+
+  public double calculate(Measurable measurable) {
+    if (measurable.getDouble(Metric.PUBLIC_API) == 0) {
+      return 1;
+    }
+    return measurable.getDouble(Metric.PUBLIC_DOC_API) / measurable.getDouble(Metric.PUBLIC_API);
+  }
+
+}
diff --git a/sonar-squid/src/main/java/org/sonar/squid/measures/SumAggregationFormula.java b/sonar-squid/src/main/java/org/sonar/squid/measures/SumAggregationFormula.java
new file mode 100644
index 00000000000..aface2e2d63
--- /dev/null
+++ b/sonar-squid/src/main/java/org/sonar/squid/measures/SumAggregationFormula.java
@@ -0,0 +1,34 @@
+/*
+ * Sonar, open source software quality management tool.
+ * Copyright (C) 2009 SonarSource SA
+ * mailto:contact AT sonarsource DOT com
+ *
+ * Sonar is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * Sonar is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Sonar; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
+ */
+package org.sonar.squid.measures;
+
+import java.util.Collection;
+
+public class SumAggregationFormula implements AggregationFormula {
+
+  public double aggregate(MetricDef metric, Collection<Measurable> measurables) {
+    double aggregation = 0;
+    for (Measurable measurable : measurables) {
+      aggregation += measurable.getDouble(metric);
+    }
+    return aggregation;
+  }
+
+}
diff --git a/sonar-squid/src/main/java/org/sonar/squid/recognizer/CamelCaseDetector.java b/sonar-squid/src/main/java/org/sonar/squid/recognizer/CamelCaseDetector.java
new file mode 100644
index 00000000000..60e4c1d2027
--- /dev/null
+++ b/sonar-squid/src/main/java/org/sonar/squid/recognizer/CamelCaseDetector.java
@@ -0,0 +1,45 @@
+/*
+ * Sonar, open source software quality management tool.
+ * Copyright (C) 2009 SonarSource SA
+ * mailto:contact AT sonarsource DOT com
+ *
+ * Sonar is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * Sonar is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Sonar; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
+ */
+package org.sonar.squid.recognizer;
+
+public class CamelCaseDetector extends Detector {
+
+  public CamelCaseDetector(double probability) {
+    super(probability);
+  }
+
+  @Override
+  public int scan(String line) {
+    char previousChar = ' ';
+    char indexChar;
+    for (int i = 0; i < line.length(); i++) {
+      indexChar = line.charAt(i);
+      if (isLowerCaseThenUpperCase(previousChar, indexChar)) {
+        return 1;
+      }
+      previousChar = indexChar;
+    }
+    return 0;
+  }
+
+  private boolean isLowerCaseThenUpperCase(char previousChar, char indexChar) {
+    return Character.getType(previousChar) == Character.LOWERCASE_LETTER && Character.getType(indexChar) == Character.UPPERCASE_LETTER;
+  }
+}
diff --git a/sonar-squid/src/main/java/org/sonar/squid/recognizer/CodeRecognizer.java b/sonar-squid/src/main/java/org/sonar/squid/recognizer/CodeRecognizer.java
new file mode 100644
index 00000000000..7a8a1c14349
--- /dev/null
+++ b/sonar-squid/src/main/java/org/sonar/squid/recognizer/CodeRecognizer.java
@@ -0,0 +1,56 @@
+/*
+ * Sonar, open source software quality management tool.
+ * Copyright (C) 2009 SonarSource SA
+ * mailto:contact AT sonarsource DOT com
+ *
+ * Sonar is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * Sonar is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Sonar; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
+ */
+package org.sonar.squid.recognizer;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class CodeRecognizer {
+
+  private LanguageFootprint language;
+  private double            threshold;
+
+  public CodeRecognizer(double threshold, LanguageFootprint language) {
+    this.language = language;
+    this.threshold = threshold;
+  }
+
+  public final double recognition(String line) {
+    double probability = 0;
+    for (Detector pattern : language.getDetectors()) {
+      probability = 1 - ((1 - probability) * (1 - pattern.recognition(line)));
+    }
+    return probability;
+  }
+
+  public final List<String> extractCodeLines(List<String> lines) {
+    ArrayList<String> codeLines = new ArrayList<String>();
+    for (String line : lines) {
+      if (recognition(line) >= threshold) {
+        codeLines.add(line);
+      }
+    }
+    return codeLines;
+  }
+
+  public final boolean isLineOfCode(String line) {
+    return recognition(line) - threshold > 0;
+  }
+}
diff --git a/sonar-squid/src/main/java/org/sonar/squid/recognizer/ContainsDetector.java b/sonar-squid/src/main/java/org/sonar/squid/recognizer/ContainsDetector.java
new file mode 100644
index 00000000000..f0ac480594b
--- /dev/null
+++ b/sonar-squid/src/main/java/org/sonar/squid/recognizer/ContainsDetector.java
@@ -0,0 +1,45 @@
+/*
+ * Sonar, open source software quality management tool.
+ * Copyright (C) 2009 SonarSource SA
+ * mailto:contact AT sonarsource DOT com
+ *
+ * Sonar is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * Sonar is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Sonar; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
+ */
+package org.sonar.squid.recognizer;
+
+import java.util.Arrays;
+import java.util.List;
+
+import org.apache.commons.lang.StringUtils;
+
+public class ContainsDetector extends Detector {
+
+  private List<String> strs;
+
+  public ContainsDetector(double probability, String... strs) {
+    super(probability);
+    this.strs = Arrays.asList(strs);
+  }
+
+  @Override
+  public int scan(String line) {
+    String lineWithoutWhitespaces = StringUtils.deleteWhitespace(line);
+    int matchers = 0;
+    for (String str : strs) {
+      matchers += StringUtils.countMatches(lineWithoutWhitespaces, str);
+    }
+    return matchers;
+  }
+}
diff --git a/sonar-squid/src/main/java/org/sonar/squid/recognizer/Detector.java b/sonar-squid/src/main/java/org/sonar/squid/recognizer/Detector.java
new file mode 100644
index 00000000000..7fa1083b8a1
--- /dev/null
+++ b/sonar-squid/src/main/java/org/sonar/squid/recognizer/Detector.java
@@ -0,0 +1,42 @@
+/*
+ * Sonar, open source software quality management tool.
+ * Copyright (C) 2009 SonarSource SA
+ * mailto:contact AT sonarsource DOT com
+ *
+ * Sonar is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * Sonar is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Sonar; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
+ */
+package org.sonar.squid.recognizer;
+
+public abstract class Detector {
+
+  public final double probability;
+
+  public Detector(double probability) {
+    if (probability < 0 || probability > 1) {
+      throw new IllegalArgumentException("probability should be between [0 .. 1]");
+    }
+    this.probability = probability;
+  }
+
+  public abstract int scan(String line);
+
+  public final double recognition(String line) {
+    int matchers = scan(line);
+    if (matchers == 0) {
+      return 0;
+    }
+    return 1 - Math.pow(1 - probability, scan(line));
+  }
+}
diff --git a/sonar-squid/src/main/java/org/sonar/squid/recognizer/EndWithDetector.java b/sonar-squid/src/main/java/org/sonar/squid/recognizer/EndWithDetector.java
new file mode 100644
index 00000000000..066a35c2e5f
--- /dev/null
+++ b/sonar-squid/src/main/java/org/sonar/squid/recognizer/EndWithDetector.java
@@ -0,0 +1,46 @@
+/*
+ * Sonar, open source software quality management tool.
+ * Copyright (C) 2009 SonarSource SA
+ * mailto:contact AT sonarsource DOT com
+ *
+ * Sonar is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * Sonar is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Sonar; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
+ */
+package org.sonar.squid.recognizer;
+
+public class EndWithDetector extends Detector {
+
+  private char[] endOfLines;
+
+  public EndWithDetector(double probability, char... endOfLines) {
+    super(probability);
+    this.endOfLines = endOfLines;
+  }
+
+  @Override
+  public int scan(String line) {
+    for (int index = line.length() - 1; index >= 0; index--) {
+      char character = line.charAt(index);
+      for (char endOfLine : endOfLines) {
+        if ( character == endOfLine) {
+          return 1;
+        } 
+      }
+      if(!Character.isWhitespace(character) && character != '*' && character != '/'){
+        return 0;
+      }
+    }
+    return 0;
+  }
+}
diff --git a/sonar-squid/src/main/java/org/sonar/squid/recognizer/KeywordsDetector.java b/sonar-squid/src/main/java/org/sonar/squid/recognizer/KeywordsDetector.java
new file mode 100644
index 00000000000..a4e708f8fe5
--- /dev/null
+++ b/sonar-squid/src/main/java/org/sonar/squid/recognizer/KeywordsDetector.java
@@ -0,0 +1,57 @@
+/*
+ * Sonar, open source software quality management tool.
+ * Copyright (C) 2009 SonarSource SA
+ * mailto:contact AT sonarsource DOT com
+ *
+ * Sonar is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * Sonar is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Sonar; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
+ */
+package org.sonar.squid.recognizer;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.Locale;
+import java.util.StringTokenizer;
+
+public class KeywordsDetector extends Detector {
+
+  private List<String> keywords;
+  private boolean toUpperCase = false;
+
+  public KeywordsDetector(double probability, String... keywords) {
+    super(probability);
+    this.keywords = Arrays.asList(keywords);
+  }
+
+  public KeywordsDetector(double probability, boolean toUpperCase, String... keywords) {
+    this(probability, keywords);
+    this.toUpperCase = toUpperCase;
+  }
+
+  @Override
+  public int scan(String line) {
+    int matchers = 0;
+    if (toUpperCase) {
+      line = line.toUpperCase(Locale.getDefault());
+    }
+    StringTokenizer tokenizer = new StringTokenizer(line, " \t(),{}");
+    while (tokenizer.hasMoreTokens()) {
+      String word = tokenizer.nextToken();
+      if (keywords.contains(word)) {
+        matchers++;
+      }
+    }
+    return matchers;
+  }
+}
diff --git a/sonar-squid/src/main/java/org/sonar/squid/recognizer/LanguageFootprint.java b/sonar-squid/src/main/java/org/sonar/squid/recognizer/LanguageFootprint.java
new file mode 100644
index 00000000000..469118a57b8
--- /dev/null
+++ b/sonar-squid/src/main/java/org/sonar/squid/recognizer/LanguageFootprint.java
@@ -0,0 +1,27 @@
+/*
+ * Sonar, open source software quality management tool.
+ * Copyright (C) 2009 SonarSource SA
+ * mailto:contact AT sonarsource DOT com
+ *
+ * Sonar is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * Sonar is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Sonar; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
+ */
+package org.sonar.squid.recognizer;
+
+import java.util.Set;
+
+public interface LanguageFootprint {
+
+  Set<Detector> getDetectors();
+}
diff --git a/sonar-squid/src/main/java/org/sonar/squid/recognizer/RegexDetector.java b/sonar-squid/src/main/java/org/sonar/squid/recognizer/RegexDetector.java
new file mode 100644
index 00000000000..0ffa49303a5
--- /dev/null
+++ b/sonar-squid/src/main/java/org/sonar/squid/recognizer/RegexDetector.java
@@ -0,0 +1,43 @@
+/*
+ * Sonar, open source software quality management tool.
+ * Copyright (C) 2009 SonarSource SA
+ * mailto:contact AT sonarsource DOT com
+ *
+ * Sonar is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * Sonar is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Sonar; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
+ */
+package org.sonar.squid.recognizer;
+
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+public class RegexDetector extends Detector {
+
+  private Pattern regex;
+
+  public RegexDetector(String regex, double probability) {
+    super(probability);
+    this.regex = Pattern.compile(regex);
+  }
+
+  @Override
+  public int scan(String line) {
+    Matcher matcher = regex.matcher(line);
+    int matchers = 0;
+    while (matcher.find()) {
+      matchers++;
+    }
+    return matchers;
+  }
+}
diff --git a/sonar-squid/src/main/java/org/sonar/squid/text/Line.java b/sonar-squid/src/main/java/org/sonar/squid/text/Line.java
new file mode 100644
index 00000000000..ef633b4c79f
--- /dev/null
+++ b/sonar-squid/src/main/java/org/sonar/squid/text/Line.java
@@ -0,0 +1,233 @@
+/*
+ * Sonar, open source software quality management tool.
+ * Copyright (C) 2009 SonarSource SA
+ * mailto:contact AT sonarsource DOT com
+ *
+ * Sonar is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * Sonar is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Sonar; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
+ */
+package org.sonar.squid.text;
+
+import org.apache.commons.lang.StringUtils;
+import org.sonar.squid.measures.Measurable;
+import org.sonar.squid.measures.Metric;
+
+class Line implements Measurable<Metric> {
+
+  private final int lineIndex;
+  private int blankLine = 0;
+  private int line = 1;
+  private int lineOfCode = 0;
+  private int commentLine = 0;
+  private int headerCommentLine = 0;
+  private int commentBlankLine = 0;
+  private int commentedOutCodeLine = 0;
+  private String comment = null;
+  private StringBuilder stringLine;
+  private boolean isBlank;
+  private boolean isThereJavadoc;
+  private boolean isThereLicenseHeaderComment;
+  private final static String NOSONAR_TAG = "NOSONAR";
+
+  Line() {
+    this.lineIndex = 0;
+  }
+
+  Line(String stringLine) {
+    this();
+    setString(new StringBuilder(stringLine));
+  }
+
+  Line(int lineIndex, StringBuilder stringLine) {
+    this(lineIndex);
+    setString(stringLine);
+  }
+
+  Line(int lineIndex) {
+    this.lineIndex = lineIndex;
+  }
+
+  final void setString(StringBuilder stringLine) {
+    this.stringLine = stringLine;
+    isBlank = isBlankLine();
+  }
+
+  private boolean isBlankLine() {
+    for (int i = 0; i < stringLine.length(); i++) {
+      if ( !Character.isWhitespace(stringLine.charAt(i))) {
+        return false;
+      }
+    }
+    return true;
+  }
+
+  /**
+   * {@inheritDoc}
+   */
+  public double getDouble(Metric metric) {
+    return getInt(metric);
+  }
+
+  /**
+   * {@inheritDoc}
+   */
+  public int getInt(Metric metric) {
+    switch (metric) {
+      case BLANK_LINES:
+        return blankLine;
+      case LINES:
+        return line;
+      case LINES_OF_CODE:
+        return lineOfCode;
+      case COMMENT_LINES:
+        return commentLine;
+      case COMMENTED_OUT_CODE_LINES:
+        return commentedOutCodeLine;
+      case COMMENT_BLANK_LINES:
+        return commentBlankLine;
+      case HEADER_COMMENT_LINES:
+        return headerCommentLine;
+      default:
+        throw new IllegalStateException("Metric " + metric.name() + " is not available on Line object.");
+    }
+  }
+
+  /**
+   * {@inheritDoc}
+   */
+  public void setMeasure(Metric metric, double measure) {
+    setMeasure(metric, (int) measure);
+  }
+
+  /**
+   * {@inheritDoc}
+   */
+  public void setMeasure(Metric metric, int measure) {
+    switch (metric) {
+      case BLANK_LINES:
+        blankLine = measure;
+        break;
+      case LINES_OF_CODE:
+        lineOfCode = measure;
+        break;
+      case COMMENT_LINES:
+        commentLine = measure;
+        break;
+      case COMMENTED_OUT_CODE_LINES:
+        commentedOutCodeLine = measure;
+        break;
+      case COMMENT_BLANK_LINES:
+        commentBlankLine = measure;
+        break;
+      case HEADER_COMMENT_LINES:
+        headerCommentLine = measure;
+        break;
+      case LINES:
+        throw new IllegalStateException("Metric LINES always equals 1 on a Line and you are not permitted to change this value.");
+      default:
+        throw new IllegalStateException("Metric " + metric.name() + " is not suitable for Line object.");
+    }
+  }
+
+  void setComment(String comment) {
+    this.comment = comment;
+  }
+
+  void setComment(String comment, boolean isJavadoc) {
+    setComment(comment);
+    this.isThereJavadoc = isJavadoc;
+  }
+
+  void setComment(String comment, boolean isJavadoc, boolean isLicenseHeader) {
+    setComment(comment, isJavadoc);
+    this.isThereLicenseHeaderComment = isLicenseHeader;
+  }
+
+  String getString() {
+    return stringLine.toString();
+  }
+
+  boolean isBlank() {
+    return !isThereComment() && isBlank;
+  }
+
+  boolean isThereCode() {
+    if ( !isBlank() && !isThereComment()) {
+      return true;
+    }
+    if (isThereComment() && isThereCodeBeforeOrAfterComment()) {
+      return true;
+    }
+    return false;
+  }
+
+  private boolean isThereCodeBeforeOrAfterComment() {
+    if ( !isThereComment()) {
+      throw new IllegalStateException("You can't call this method when there isn't any comment");
+    }
+    boolean isThereCodeBeforeComment = false;
+    boolean isThereCodeAfterComment = false;
+    int commentStartIndex = stringLine.indexOf(comment);
+    int commentEndIndex = commentStartIndex + comment.length() - 1;
+    if (commentStartIndex > 0) {
+      isThereCodeBeforeComment = !StringUtils.isBlank(stringLine.substring(0, commentStartIndex - 1));
+    }
+    if (commentEndIndex > 0 && commentEndIndex != stringLine.length() - 1) {
+      isThereCodeAfterComment = !StringUtils.isBlank(stringLine.substring(commentEndIndex + 1));
+    }
+    return isThereCodeBeforeComment || isThereCodeAfterComment;
+  }
+
+  boolean isThereComment() {
+    return comment != null;
+  }
+
+  String getComment() {
+    return comment;
+  }
+
+  boolean isThereBlankComment() {
+    if (isThereComment()) {
+      for (int i = 0; i < comment.length(); i++) {
+        char character = comment.charAt(i);
+        if ( !Character.isWhitespace(character) && character != '*' && character != '/') {
+          return false;
+        }
+      }
+      return true;
+    }
+    return false;
+  }
+
+  boolean isThereJavadoc() {
+    return isThereJavadoc;
+  }
+
+  boolean isThereLicenseHeaderComment() {
+    return isThereLicenseHeaderComment;
+  }
+
+  boolean isThereNoSonarTag() {
+    return isThereComment() && comment.contains(NOSONAR_TAG);
+  }
+
+  int getLineIndex() {
+    return lineIndex;
+  }
+
+  void deleteLineContent() {
+    comment = null;
+    stringLine = null;
+  }
+}
diff --git a/sonar-squid/src/main/java/org/sonar/squid/text/LineContextHandler.java b/sonar-squid/src/main/java/org/sonar/squid/text/LineContextHandler.java
new file mode 100644
index 00000000000..097478c9f85
--- /dev/null
+++ b/sonar-squid/src/main/java/org/sonar/squid/text/LineContextHandler.java
@@ -0,0 +1,59 @@
+/*
+ * Sonar, open source software quality management tool.
+ * Copyright (C) 2009 SonarSource SA
+ * mailto:contact AT sonarsource DOT com
+ *
+ * Sonar is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * Sonar is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Sonar; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
+ */
+package org.sonar.squid.text;
+
+abstract class LineContextHandler {
+
+  abstract boolean matchToEnd(Line line, StringBuilder pendingLine);
+
+  abstract boolean matchWithEndOfLine(Line line, StringBuilder pendingLine);
+
+  abstract boolean matchToBegin(Line line, StringBuilder pendingLine);
+
+  static boolean matchEndOfString(StringBuilder pendingLine, String end) {
+    int pendingLineIndex = pendingLine.length() - end.length();
+    if (pendingLineIndex < 0) {
+      return false;
+    }
+    for (int endIndex = 0; endIndex < end.length(); endIndex++) {
+      char endChar = end.charAt(endIndex);
+      char pendingLineChar = pendingLine.charAt(pendingLineIndex + endIndex);
+      if (endChar != pendingLineChar) {
+        return false;
+      }
+    }
+    return true;
+  }
+
+  static boolean matchEndOfString(StringBuilder pendingLine, char endChar) {
+    if (pendingLine.length() < 1) {
+      return false;
+    }
+    return pendingLine.charAt(pendingLine.length() - 1) == endChar;
+  }
+
+  static char getLastCharacter(StringBuilder pendingLine) {
+    if (pendingLine.length() < 1) {
+      throw new IllegalStateException("The pending line is empty.");
+    }
+    return pendingLine.charAt(pendingLine.length() - 1);
+  }
+
+}
diff --git a/sonar-squid/src/main/java/org/sonar/squid/text/LinesFactory.java b/sonar-squid/src/main/java/org/sonar/squid/text/LinesFactory.java
new file mode 100644
index 00000000000..6e98de3da35
--- /dev/null
+++ b/sonar-squid/src/main/java/org/sonar/squid/text/LinesFactory.java
@@ -0,0 +1,139 @@
+/*
+ * Sonar, open source software quality management tool.
+ * Copyright (C) 2009 SonarSource SA
+ * mailto:contact AT sonarsource DOT com
+ *
+ * Sonar is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * Sonar is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Sonar; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
+ */
+package org.sonar.squid.text;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.Reader;
+import java.util.ArrayList;
+import java.util.List;
+
+import org.sonar.squid.api.AnalysisException;
+
+class LinesFactory {
+
+  private final List<Line> lines = new ArrayList<Line>();
+  private char lastReadCharacter;
+  private StringBuilder currentStringBuilder = new StringBuilder();
+  private Line currentLine;
+  private static final char LF = '\n';
+  private static final char CR = '\r';
+  private static final int EOF = -1;
+  private LineContextHandler currentHandler;
+  private LineContextHandler[] handlers;
+
+  LinesFactory(Reader reader, String... additionalSingleLineCommentFlags) {
+    List<LineContextHandler> tmpHandlers = new ArrayList<LineContextHandler>();
+    for (String additionalSingleLineCommentFlag : additionalSingleLineCommentFlags) {
+      tmpHandlers.add(new SingleLineCommentHandler(additionalSingleLineCommentFlag));
+    }
+    tmpHandlers.add(new SingleLineCommentHandler("//", "*//"));
+    tmpHandlers.add(new MultiLinesCommentHandler());
+    tmpHandlers.add(new LiteralValueHandler('\''));
+    tmpHandlers.add(new LiteralValueHandler('"'));
+    this.handlers = tmpHandlers.toArray(new LineContextHandler[tmpHandlers.size()]);
+    fillLines(new BufferedReader(reader));
+  }
+
+  private void fillLines(Reader reader) {
+    try {
+      currentLine = new Line(1);
+      int nextChar;
+      do {
+        nextChar = reader.read();
+        if (isEndOfFile(nextChar)) {
+          notifyHandlersAboutEndOfLine();
+          break;
+        }
+        lastReadCharacter = (char) nextChar;
+        if (isEndOfLine(nextChar)) {
+          popOptionalRemainingEndOfLineChar(reader);
+          createNewLine();
+          continue;
+        }
+        appendToStringBuilder(nextChar);
+        notifyHandlersAboutNewChar();
+      } while (true);
+    } catch (IOException e) {
+      throw new AnalysisException("Unable to read the source code.", e);
+    } catch (Exception e) {
+      throw new AnalysisException("A problem was encountered when analyzing line " + lines.size() + " : '"
+          + currentStringBuilder.toString() + "'", e);
+    }
+  }
+
+  private void popOptionalRemainingEndOfLineChar(Reader reader) throws IOException {
+    reader.mark(1);
+    char nextChar = (char) reader.read();
+    reader.reset();
+    if (isTechnicalCharacter(nextChar) && lastReadCharacter != nextChar) {
+      reader.read();
+    }
+  }
+
+  private void notifyHandlersAboutNewChar() {
+    if (currentHandler == null) {
+      for (LineContextHandler handler : handlers) {
+        if (handler.matchToBegin(currentLine, currentStringBuilder)) {
+          currentHandler = handler;
+          break;
+        }
+      }
+    } else if (currentHandler.matchToEnd(currentLine, currentStringBuilder)) {
+      currentHandler = null;
+    }
+  }
+
+  private void notifyHandlersAboutEndOfLine() {
+    if (currentHandler != null && currentHandler.matchWithEndOfLine(currentLine, currentStringBuilder)) {
+      currentHandler = null;
+    }
+  }
+
+  private void createNewLine() {
+    notifyHandlersAboutEndOfLine();
+    currentLine.setString(currentStringBuilder);
+    lines.add(currentLine);
+    currentLine = new Line(lines.size() + 1);
+    currentStringBuilder = new StringBuilder();
+  }
+
+  private void appendToStringBuilder(int nextChar) {
+    if (!isTechnicalCharacter(nextChar)) {
+      currentStringBuilder.append((char) nextChar);
+    }
+  }
+
+  private boolean isEndOfFile(int nextChar) {
+    return nextChar == EOF && currentStringBuilder.length() == 0 && lastReadCharacter != LF;
+  }
+
+  private boolean isEndOfLine(int nextChar) {
+    return nextChar == EOF || (char) nextChar == LF || (char) nextChar == CR;
+  }
+
+  private boolean isTechnicalCharacter(int nextChar) {
+    return nextChar == LF || nextChar == CR || nextChar == EOF;
+  }
+
+  List<Line> getLines() {
+    return lines;
+  }
+}
diff --git a/sonar-squid/src/main/java/org/sonar/squid/text/LiteralValueHandler.java b/sonar-squid/src/main/java/org/sonar/squid/text/LiteralValueHandler.java
new file mode 100644
index 00000000000..907c87827c9
--- /dev/null
+++ b/sonar-squid/src/main/java/org/sonar/squid/text/LiteralValueHandler.java
@@ -0,0 +1,59 @@
+/*
+ * Sonar, open source software quality management tool.
+ * Copyright (C) 2009 SonarSource SA
+ * mailto:contact AT sonarsource DOT com
+ *
+ * Sonar is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * Sonar is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Sonar; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
+ */
+package org.sonar.squid.text;
+
+public class LiteralValueHandler extends LineContextHandler {
+
+  private final char delimiter;
+
+  public LiteralValueHandler(char delimiter) {
+    this.delimiter = delimiter;
+  }
+
+  @Override
+  boolean matchToEnd(Line line, StringBuilder pendingLine) {
+    return matchEndOfString(pendingLine, delimiter) && evenNumberOfBackSlashBeforeDelimiter(pendingLine);
+  }
+
+  private boolean evenNumberOfBackSlashBeforeDelimiter(StringBuilder pendingLine) {
+    int numberOfBackSlashChar = 0;
+    for (int index = pendingLine.length() - 2; index >= 0; index--) {
+      if (pendingLine.charAt(index) == '\\') {
+        numberOfBackSlashChar++;
+      } else {
+        break;
+      }
+    }
+    return numberOfBackSlashChar % 2 == 0;
+  }
+
+  @Override
+  boolean matchToBegin(Line line, StringBuilder pendingLine) {
+    if (matchEndOfString(pendingLine, delimiter)) {
+      return true;
+    }
+    return false;
+  }
+
+  @Override
+  boolean matchWithEndOfLine(Line line, StringBuilder pendingLine) {
+    return true; //see http://jira.codehaus.org/browse/SONAR-1555
+  }
+}
diff --git a/sonar-squid/src/main/java/org/sonar/squid/text/MultiLinesCommentHandler.java b/sonar-squid/src/main/java/org/sonar/squid/text/MultiLinesCommentHandler.java
new file mode 100644
index 00000000000..5aeaadd12ce
--- /dev/null
+++ b/sonar-squid/src/main/java/org/sonar/squid/text/MultiLinesCommentHandler.java
@@ -0,0 +1,101 @@
+/*
+ * Sonar, open source software quality management tool.
+ * Copyright (C) 2009 SonarSource SA
+ * mailto:contact AT sonarsource DOT com
+ *
+ * Sonar is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * Sonar is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Sonar; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
+ */
+package org.sonar.squid.text;
+
+public class MultiLinesCommentHandler extends LineContextHandler {
+
+  private StringBuilder currentLineComment;
+  private boolean isFirstLineOfComment = false;
+
+  private boolean isJavadoc = false;
+  private boolean isLicenseHeader = false;
+
+  private boolean commentStarted = false;
+
+  private static final String START_COMMENT_TAG = "/*";
+  private static final String START_JAVADOC_TAG = "/**";
+  private static final String START_GWT_NATIVE_CODE_TAG = "/*-{";
+  private static final String END_COMMENT_TAG = "*/";
+
+  @Override
+  boolean matchToEnd(Line line, StringBuilder pendingLine) {
+    if ( !commentStarted) {
+      throw new IllegalStateException("Method doContextBegin(StringBuilder pendingLine) has not been called first (line = '" + pendingLine
+          + "').");
+    }
+    currentLineComment.append(getLastCharacter(pendingLine));
+    if (isJavaDoc()) {
+      isJavadoc = true;
+    }
+    if (isGwtNativeCode()) {
+      initProperties();
+      return true;
+    }
+    boolean match = matchEndOfString(pendingLine, END_COMMENT_TAG);
+    if (match && !(isFirstLineOfComment && pendingLine.indexOf(START_COMMENT_TAG) + 1 == pendingLine.indexOf(END_COMMENT_TAG))) {
+      endOfCommentLine(line);
+      initProperties();
+      return true;
+    }
+    return false;
+  }
+
+  private boolean isGwtNativeCode() {
+    return isFirstLineOfComment && currentLineComment.length() == START_GWT_NATIVE_CODE_TAG.length()
+        && currentLineComment.toString().equals(START_GWT_NATIVE_CODE_TAG);
+  }
+
+  private boolean isJavaDoc() {
+    return isFirstLineOfComment && currentLineComment.length() == START_JAVADOC_TAG.length()
+        && currentLineComment.toString().equals(START_JAVADOC_TAG);
+  }
+
+  @Override
+  boolean matchToBegin(Line line, StringBuilder pendingLine) {
+    boolean match = matchEndOfString(pendingLine, START_COMMENT_TAG);
+    if (match) {
+      isFirstLineOfComment = true;
+      commentStarted = true;
+      currentLineComment = new StringBuilder(START_COMMENT_TAG);
+      isLicenseHeader = (line.getLineIndex() == 1);
+    }
+    return match;
+  }
+
+  @Override
+  boolean matchWithEndOfLine(Line line, StringBuilder pendingLine) {
+    endOfCommentLine(line);
+    return false;
+  }
+
+  private void endOfCommentLine(Line line) {
+    line.setComment(currentLineComment.toString(), isJavadoc, isLicenseHeader);
+    currentLineComment = new StringBuilder();
+    isFirstLineOfComment = false;
+  }
+
+  private void initProperties() {
+    commentStarted = false;
+    isJavadoc = false;
+    isLicenseHeader = false;
+    currentLineComment = new StringBuilder();
+    isFirstLineOfComment = false;
+  }
+}
diff --git a/sonar-squid/src/main/java/org/sonar/squid/text/SingleLineCommentHandler.java b/sonar-squid/src/main/java/org/sonar/squid/text/SingleLineCommentHandler.java
new file mode 100644
index 00000000000..f20861a96d8
--- /dev/null
+++ b/sonar-squid/src/main/java/org/sonar/squid/text/SingleLineCommentHandler.java
@@ -0,0 +1,63 @@
+/*
+ * Sonar, open source software quality management tool.
+ * Copyright (C) 2009 SonarSource SA
+ * mailto:contact AT sonarsource DOT com
+ *
+ * Sonar is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * Sonar is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Sonar; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
+ */
+package org.sonar.squid.text;
+
+public class SingleLineCommentHandler extends LineContextHandler {
+
+  private StringBuilder comment;
+
+  private final String commentStartTag;
+  private final String commentNotStartTag;
+
+  public SingleLineCommentHandler(String commentStartTag) {
+    this(commentStartTag, null);
+  }
+
+  public SingleLineCommentHandler(String commentStartTag, String commentNotStartTag) {
+    this.commentStartTag = commentStartTag;
+    this.commentNotStartTag = commentNotStartTag;
+  }
+
+  @Override
+  boolean matchToEnd(Line line, StringBuilder pendingLine) {
+    if (comment == null) {
+      throw new IllegalStateException("Method doContextBegin(StringBuilder pendingLine) has not been called.");
+    }
+    comment.append(getLastCharacter(pendingLine));
+    return false;
+  }
+
+  @Override
+  boolean matchToBegin(Line line, StringBuilder pendingLine) {
+    boolean doContextBegin = matchEndOfString(pendingLine, commentStartTag)
+        && (commentNotStartTag == null || !matchEndOfString(pendingLine, commentNotStartTag));
+    if (doContextBegin) {
+      comment = new StringBuilder(commentStartTag);
+    }
+    return doContextBegin;
+  }
+
+  @Override
+  boolean matchWithEndOfLine(Line line, StringBuilder pendingLine) {
+    line.setComment(comment.toString());
+    comment = null;
+    return true;
+  }
+}
diff --git a/sonar-squid/src/main/java/org/sonar/squid/text/Source.java b/sonar-squid/src/main/java/org/sonar/squid/text/Source.java
new file mode 100644
index 00000000000..5087aaba331
--- /dev/null
+++ b/sonar-squid/src/main/java/org/sonar/squid/text/Source.java
@@ -0,0 +1,128 @@
+/*
+ * Sonar, open source software quality management tool.
+ * Copyright (C) 2009 SonarSource SA
+ * mailto:contact AT sonarsource DOT com
+ *
+ * Sonar is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * Sonar is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Sonar; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
+ */
+package org.sonar.squid.text;
+
+import java.io.Reader;
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+
+import org.sonar.squid.measures.Metric;
+import org.sonar.squid.recognizer.CodeRecognizer;
+
+public class Source {
+
+  private List<Line> lines = new ArrayList<Line>();
+  private CodeRecognizer codeRecognizer;
+  private Set<Integer> noSonarTagLines = new HashSet<Integer>();
+
+  public Source(Reader reader, CodeRecognizer codeRecognizer, String... additionalSingleLineCommentFlag) {
+    this.codeRecognizer = codeRecognizer;
+    LinesFactory linesFactory = new LinesFactory(reader, additionalSingleLineCommentFlag);
+    lines = linesFactory.getLines();
+    processLines();
+  }
+
+  public Source(String[] stringLines, CodeRecognizer codeRecognizer) {
+    this(new StringArrayReader(stringLines), codeRecognizer);
+  }
+
+  private void processLines() {
+    for (Line line : lines) {
+      computeBlankLine(line);
+      computeHeaderCommentLine(line);
+      computeCommentLine(line);
+      computeCommentBlankLine(line);
+      computeLineOfCode(line);
+      computeNoSonarTag(line);
+      line.deleteLineContent();
+    }
+  }
+
+  private void computeNoSonarTag(Line line) {
+    if (line.isThereNoSonarTag()) {
+      noSonarTagLines.add(line.getLineIndex());
+    }
+  }
+
+  private void computeLineOfCode(Line line) {
+    if (line.isThereCode()) {
+      line.setMeasure(Metric.LINES_OF_CODE, 1);
+    }
+  }
+
+  private void computeHeaderCommentLine(Line line) {
+    if (line.isThereComment() && !line.isThereBlankComment() && line.isThereLicenseHeaderComment()) {
+      line.setMeasure(Metric.HEADER_COMMENT_LINES, 1);
+    }
+  }
+
+  private void computeCommentLine(Line line) {
+    if (line.isThereComment() && !line.isThereBlankComment()) {
+      if (line.isThereJavadoc() || line.isThereLicenseHeaderComment()) {
+        line.setMeasure(Metric.COMMENT_LINES, 1);
+        return;
+      }
+
+      boolean isCommentedOutCode = codeRecognizer.isLineOfCode(line.getComment());
+      if (!isCommentedOutCode) {
+        line.setMeasure(Metric.COMMENT_LINES, 1);
+      } else {
+        line.setMeasure(Metric.COMMENTED_OUT_CODE_LINES, 1);
+      }
+    }
+  }
+
+  private void computeBlankLine(Line line) {
+    if (line.isBlank()) {
+      line.setMeasure(Metric.BLANK_LINES, 1);
+    }
+  }
+
+  private void computeCommentBlankLine(Line line) {
+    if (line.isThereBlankComment()) {
+      line.setMeasure(Metric.COMMENT_BLANK_LINES, 1);
+    }
+  }
+
+  public int getMeasure(Metric metric) {
+    return getMeasure(metric, 1, lines.size());
+  }
+
+  public int getMeasure(Metric metric, int fromLine, int toLine) {
+    if (toLine > lines.size()) {
+      throw new IllegalStateException("There are only " + lines.size() + " lines in the file and you're trying to reach line " + toLine);
+    }
+    if (fromLine < 1) {
+      throw new IllegalStateException("Line index starts from 1 and not from " + fromLine);
+    }
+
+    int measure = 0;
+    for (int index = fromLine; index < toLine + 1; index++) {
+      measure += lines.get(index - 1).getInt(metric);
+    }
+    return measure;
+  }
+
+  public Set<Integer> getNoSonarTagLines() {
+    return noSonarTagLines;
+  }
+}
diff --git a/sonar-squid/src/main/java/org/sonar/squid/text/StringArrayReader.java b/sonar-squid/src/main/java/org/sonar/squid/text/StringArrayReader.java
new file mode 100644
index 00000000000..1c923d0adc7
--- /dev/null
+++ b/sonar-squid/src/main/java/org/sonar/squid/text/StringArrayReader.java
@@ -0,0 +1,96 @@
+/*
+ * Sonar, open source software quality management tool.
+ * Copyright (C) 2009 SonarSource SA
+ * mailto:contact AT sonarsource DOT com
+ *
+ * Sonar is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * Sonar is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Sonar; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
+ */
+package org.sonar.squid.text;
+
+import java.io.IOException;
+import java.io.Reader;
+import java.io.StringReader;
+
+public class StringArrayReader extends Reader {
+
+  private final StringReader stringReader;
+
+  enum EndOfLineDelimiter {
+    LF, CR_PLUS_LF, CR
+  }
+
+  public StringArrayReader(String[] lines) {
+    this(lines, EndOfLineDelimiter.LF);
+  }
+
+  public StringArrayReader(String[] lines, EndOfLineDelimiter endOfLineDelimiter) {
+    if (lines == null) {
+      throw new IllegalStateException("lines object can't be null.");
+    }
+    String content = convertArrayToStringAndAppendEndOfLine(lines, endOfLineDelimiter);
+    stringReader = new StringReader(content);
+  }
+
+  private String convertArrayToStringAndAppendEndOfLine(String[] lines, EndOfLineDelimiter endOfLineDelimiter) {
+    StringBuilder content = new StringBuilder();
+    for (int i = 0; i < lines.length; i++) {
+      content.append(lines[i]);
+      if (i != (lines.length - 1)) {
+        switch (endOfLineDelimiter) {
+          case LF:
+            content.append('\n');
+            break;
+          case CR:
+            content.append('\r');
+            break;
+          case CR_PLUS_LF:
+            content.append("\r\n");
+            break;
+        }
+      }
+    }
+    return content.toString();
+  }
+
+  @Override
+  public void close() throws IOException {
+    stringReader.close();
+  }
+
+  @Override
+  public boolean ready() throws IOException {
+    return stringReader.ready();
+  }
+
+  @Override
+  public boolean markSupported() {
+    return stringReader.markSupported();
+  }
+
+  @Override
+  public void mark(int readAheadLimit) throws IOException {
+    stringReader.mark(readAheadLimit);
+  }
+
+  @Override
+  public void reset() throws IOException {
+    stringReader.reset();
+  }
+
+  @Override
+  public int read(char[] cbuf, int off, int len) throws IOException {
+    return stringReader.read(cbuf, off, len);
+  }
+}