Configure fop-{sandbox,servlet,transcoder}, checkstyle, findbugs; fixups for ant targets.

git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/branches/maven@1734671 13f79535-47bb-0310-9956-ffa450edef68

3 files changed, 958 insertions, 0 deletions

diff --git a/fop-util/src/main/java/org/apache/fop/util/DefaultErrorListener.java b/fop-util/src/main/java/org/apache/fop/util/DefaultErrorListener.java
new file mode 100644
index 000000000..3c554afc7
--- /dev/null
+++ b/fop-util/src/main/java/org/apache/fop/util/DefaultErrorListener.java
@@ -0,0 +1,65 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/* $Id$ */
+
+package org.apache.fop.util;
+
+import javax.xml.transform.ErrorListener;
+import javax.xml.transform.TransformerException;
+
+import org.apache.commons.logging.Log;
+
+/**
+ * Standard ErrorListener implementation for in-FOP use. Some Xalan-J versions don't properly
+ * re-throw exceptions.
+ */
+public class DefaultErrorListener implements ErrorListener {
+
+    private Log log;
+
+    /**
+     * Main constructor
+     * @param log the log instance to send log events to
+     */
+    public DefaultErrorListener(Log log) {
+        this.log = log;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public void warning(TransformerException exc) {
+        log.warn(exc.toString());
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public void error(TransformerException exc) throws TransformerException {
+        throw exc;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public void fatalError(TransformerException exc)
+            throws TransformerException {
+        throw exc;
+    }
+
+}
diff --git a/fop-util/src/main/java/org/apache/fop/util/XMLResourceBundle.java b/fop-util/src/main/java/org/apache/fop/util/XMLResourceBundle.java
new file mode 100644
index 000000000..80aec2d2f
--- /dev/null
+++ b/fop-util/src/main/java/org/apache/fop/util/XMLResourceBundle.java
@@ -0,0 +1,400 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/* $Id$ */
+
+package org.apache.fop.util;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.security.AccessController;
+import java.security.PrivilegedAction;
+import java.util.Enumeration;
+import java.util.Hashtable;
+import java.util.Locale;
+import java.util.Map;
+import java.util.MissingResourceException;
+import java.util.Properties;
+import java.util.ResourceBundle;
+import java.util.Stack;
+
+import javax.xml.transform.Transformer;
+import javax.xml.transform.TransformerException;
+import javax.xml.transform.sax.SAXResult;
+import javax.xml.transform.sax.SAXTransformerFactory;
+import javax.xml.transform.stream.StreamSource;
+
+import org.xml.sax.Attributes;
+import org.xml.sax.SAXException;
+import org.xml.sax.helpers.DefaultHandler;
+
+import org.apache.xmlgraphics.util.QName;
+
+/**
+ * This class is a ResourceBundle that loads its contents from XML files instead of properties
+ * files (like PropertiesResourceBundle).
+ * <p>
+ * The XML format for this resource bundle implementation is the following
+ * (the same as Apache Cocoon's XMLResourceBundle):
+ * <pre>
+ * &lt;catalogue xml:lang="en"&gt;
+ *   &lt;message key="key1"&gt;Message &lt;br/&gt; Value 1&lt;/message&gt;
+ *   &lt;message key="key2"&gt;Message &lt;br/&gt; Value 1&lt;/message&gt;
+ *   ...
+ * &lt;/catalogue&gt;
+ * </pre>
+ */
+public class XMLResourceBundle extends ResourceBundle {
+
+    //Note: Some code here has been copied and adapted from Apache Harmony!
+
+    private Properties resources = new Properties();
+
+    private Locale locale;
+
+    private static SAXTransformerFactory tFactory
+        = (SAXTransformerFactory)SAXTransformerFactory.newInstance();
+
+    /**
+     * Creates a resource bundle from an InputStream.
+     * @param in the stream to read from
+     * @throws IOException if an I/O error occurs
+     */
+    public XMLResourceBundle(InputStream in) throws IOException {
+        try {
+            Transformer transformer = tFactory.newTransformer();
+            StreamSource src = new StreamSource(in);
+            SAXResult res = new SAXResult(new CatalogueHandler());
+            transformer.transform(src, res);
+        } catch (TransformerException e) {
+            throw new IOException("Error while parsing XML resource bundle: " + e.getMessage());
+        }
+    }
+
+    /**
+     * Gets a resource bundle using the specified base name, default locale, and class loader.
+     * @param baseName the base name of the resource bundle, a fully qualified class name
+     * @param loader the class loader from which to load the resource bundle
+     * @return a resource bundle for the given base name and the default locale
+     * @throws MissingResourceException if no resource bundle for the specified base name can be
+     *                                          found
+     * @see java.util.ResourceBundle#getBundle(String)
+     */
+    public static ResourceBundle getXMLBundle(String baseName, ClassLoader loader)
+                throws MissingResourceException {
+        return getXMLBundle(baseName, Locale.getDefault(), loader);
+    }
+
+    /**
+     * Gets a resource bundle using the specified base name, locale, and class loader.
+     * @param baseName the base name of the resource bundle, a fully qualified class name
+     * @param locale the locale for which a resource bundle is desired
+     * @param loader the class loader from which to load the resource bundle
+     * @return a resource bundle for the given base name and locale
+     * @throws MissingResourceException if no resource bundle for the specified base name can be
+     *                                          found
+     * @see java.util.ResourceBundle#getBundle(String, Locale, ClassLoader)
+     */
+    public static ResourceBundle getXMLBundle(String baseName, Locale locale, ClassLoader loader)
+                throws MissingResourceException {
+        if (loader == null) {
+            throw new NullPointerException("loader must not be null");
+        }
+        if (baseName == null) {
+            throw new NullPointerException("baseName must not be null");
+        }
+        assert locale != null;
+        ResourceBundle bundle;
+        if (!locale.equals(Locale.getDefault())) {
+            bundle = handleGetXMLBundle(baseName, "_" + locale, false, loader);
+            if (bundle != null) {
+                return bundle;
+            }
+        }
+        bundle = handleGetXMLBundle(baseName, "_" + Locale.getDefault(), true, loader);
+        if (bundle != null) {
+            return bundle;
+        }
+        throw new MissingResourceException(
+                baseName + " (" + locale + ")", baseName + '_' + locale, null);
+    }
+
+    static class MissingBundle extends ResourceBundle {
+        public Enumeration getKeys() {
+            return null;
+        }
+
+        public Object handleGetObject(String name) {
+            return null;
+        }
+    }
+
+    private static final ResourceBundle MISSING = new MissingBundle();
+    private static final ResourceBundle MISSINGBASE = new MissingBundle();
+
+    private static Map cache = new java.util.WeakHashMap();
+    //<Object, Hashtable<String, ResourceBundle>>
+
+    private static ResourceBundle handleGetXMLBundle(String base, String locale,
+            boolean loadBase, final ClassLoader loader) {
+        XMLResourceBundle bundle = null;
+        String bundleName = base + locale;
+        Object cacheKey = loader != null ? (Object) loader : (Object) "null";
+        Hashtable loaderCache; //<String, ResourceBundle>
+        synchronized (cache) {
+            loaderCache = (Hashtable)cache.get(cacheKey);
+            if (loaderCache == null) {
+                loaderCache = new Hashtable();
+                cache.put(cacheKey, loaderCache);
+            }
+        }
+        ResourceBundle result = (ResourceBundle)loaderCache.get(bundleName);
+        if (result != null) {
+            if (result == MISSINGBASE) {
+                return null;
+            }
+            if (result == MISSING) {
+                if (!loadBase) {
+                    return null;
+                }
+                String extension = strip(locale);
+                if (extension == null) {
+                    return null;
+                }
+                return handleGetXMLBundle(base, extension, loadBase, loader);
+            }
+            return result;
+        }
+
+        final String fileName = bundleName.replace('.', '/') + ".xml";
+        InputStream stream = (InputStream)AccessController
+                .doPrivileged(new PrivilegedAction() {
+                    public Object run() {
+                        return loader == null
+                            ? ClassLoader.getSystemResourceAsStream(fileName)
+                            : loader.getResourceAsStream(fileName);
+                    }
+                });
+        if (stream != null) {
+            try {
+                try {
+                    bundle = new XMLResourceBundle(stream);
+                } finally {
+                    stream.close();
+                }
+                bundle.setLocale(locale);
+            } catch (IOException e) {
+                throw new MissingResourceException(e.getMessage(), base, null);
+            }
+        }
+
+        String extension = strip(locale);
+        if (bundle != null) {
+            if (extension != null) {
+                ResourceBundle parent = handleGetXMLBundle(base, extension, true,
+                        loader);
+                if (parent != null) {
+                    bundle.setParent(parent);
+                }
+            }
+            loaderCache.put(bundleName, bundle);
+            return bundle;
+        }
+
+        if (extension != null) {
+            ResourceBundle fallback = handleGetXMLBundle(base, extension, loadBase, loader);
+            if (fallback != null) {
+                loaderCache.put(bundleName, fallback);
+                return fallback;
+            }
+        }
+        loaderCache.put(bundleName, loadBase ? MISSINGBASE : MISSING);
+        return null;
+    }
+
+    private void setLocale(String name) {
+        String language = "";
+        String country = "";
+        String variant = "";
+        if (name.length() > 1) {
+            int nextIndex = name.indexOf('_', 1);
+            if (nextIndex == -1) {
+                nextIndex = name.length();
+            }
+            language = name.substring(1, nextIndex);
+            if (nextIndex + 1 < name.length()) {
+                int index = nextIndex;
+                nextIndex = name.indexOf('_', nextIndex + 1);
+                if (nextIndex == -1) {
+                    nextIndex = name.length();
+                }
+                country = name.substring(index + 1, nextIndex);
+                if (nextIndex + 1 < name.length()) {
+                    variant = name.substring(nextIndex + 1, name.length());
+                }
+            }
+        }
+        this.locale = new Locale(language, country, variant);
+    }
+
+    private static String strip(String name) {
+        int index = name.lastIndexOf('_');
+        if (index != -1) {
+            return name.substring(0, index);
+        }
+        return null;
+    }
+
+    private Enumeration getLocalKeys() {
+        return (Enumeration)resources.propertyNames();
+    }
+
+    /** {@inheritDoc} */
+    public Locale getLocale() {
+        return this.locale;
+    }
+
+    /** {@inheritDoc} */
+    public Enumeration getKeys() {
+        if (parent == null) {
+            return getLocalKeys();
+        }
+        return new Enumeration() {
+            private Enumeration local = getLocalKeys();
+            private Enumeration pEnum = parent.getKeys();
+
+            private Object nextElement;
+
+            private boolean findNext() {
+                if (nextElement != null) {
+                    return true;
+                }
+                while (pEnum.hasMoreElements()) {
+                    Object next = pEnum.nextElement();
+                    if (!resources.containsKey(next)) {
+                        nextElement = next;
+                        return true;
+                    }
+                }
+                return false;
+            }
+
+            public boolean hasMoreElements() {
+                if (local.hasMoreElements()) {
+                    return true;
+                }
+                return findNext();
+            }
+
+            public Object nextElement() {
+                if (local.hasMoreElements()) {
+                    return local.nextElement();
+                }
+                if (findNext()) {
+                    Object result = nextElement;
+                    nextElement = null;
+                    return result;
+                }
+                // Cause an exception
+                return pEnum.nextElement();
+            }
+        };
+    }
+
+    /** {@inheritDoc} */
+    protected Object handleGetObject(String key) {
+        if (key == null) {
+            throw new NullPointerException("key must not be null");
+        }
+        return resources.get(key);
+    }
+
+    /** {@inheritDoc} */
+    public String toString() {
+        return "XMLResourceBundle: " + getLocale();
+    }
+
+    private class CatalogueHandler extends DefaultHandler {
+
+        private static final String CATALOGUE = "catalogue";
+        private static final String MESSAGE = "message";
+
+        private StringBuffer valueBuffer = new StringBuffer();
+        private Stack elementStack = new Stack();
+        private String currentKey;
+
+        private boolean isOwnNamespace(String uri) {
+            return ("".equals(uri));
+        }
+
+        private QName getParentElementName() {
+            return (QName)elementStack.peek();
+        }
+
+        /** {@inheritDoc} */
+        public void startElement(String uri, String localName, String qName,
+                Attributes atts) throws SAXException {
+            super.startElement(uri, localName, qName, atts);
+            QName elementName = new QName(uri, qName);
+            if (isOwnNamespace(uri)) {
+                if (CATALOGUE.equals(localName)) {
+                    //nop
+                } else if (MESSAGE.equals(localName)) {
+                    if (!CATALOGUE.equals(getParentElementName().getLocalName())) {
+                        throw new SAXException(MESSAGE + " must be a child of " + CATALOGUE);
+                    }
+                    this.currentKey = atts.getValue("key");
+                } else {
+                    throw new SAXException("Invalid element name: " + elementName);
+                }
+            } else {
+                //ignore
+            }
+            this.valueBuffer.setLength(0);
+            elementStack.push(elementName);
+        }
+
+        /** {@inheritDoc} */
+        public void endElement(String uri, String localName, String qName) throws SAXException {
+            super.endElement(uri, localName, qName);
+            elementStack.pop();
+            if (isOwnNamespace(uri)) {
+                if (CATALOGUE.equals(localName)) {
+                    //nop
+                } else if (MESSAGE.equals(localName)) {
+                    if (this.currentKey == null) {
+                        throw new SAXException(
+                                "current key is null (attribute 'key' might be mistyped)");
+                    }
+                    resources.put(this.currentKey, this.valueBuffer.toString());
+                    this.currentKey = null;
+                }
+            } else {
+                //ignore
+            }
+            this.valueBuffer.setLength(0);
+        }
+
+        /** {@inheritDoc} */
+        public void characters(char[] ch, int start, int length) throws SAXException {
+            super.characters(ch, start, length);
+            valueBuffer.append(ch, start, length);
+        }
+
+    }
+
+}
diff --git a/fop-util/src/main/java/org/apache/fop/util/text/AdvancedMessageFormat.java b/fop-util/src/main/java/org/apache/fop/util/text/AdvancedMessageFormat.java
new file mode 100644
index 000000000..f8508e082
--- /dev/null
+++ b/fop-util/src/main/java/org/apache/fop/util/text/AdvancedMessageFormat.java
@@ -0,0 +1,493 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/* $Id$ */
+
+package org.apache.fop.util.text;
+
+import java.util.Iterator;
+import java.util.List;
+import java.util.Map;
+import java.util.regex.Pattern;
+
+import org.apache.xmlgraphics.util.Service;
+
+
+/**
+ * Formats messages based on a template and with a set of named parameters. This is similar to
+ * {@link java.text.MessageFormat} but uses named parameters and supports conditional sub-groups.
+ * <p>
+ * Example:
+ * </p>
+ * <p><code>Missing field "{fieldName}"[ at location: {location}]!</code></p>
+ * <ul>
+ *   <li>Curly brackets ("{}") are used for fields.</li>
+ *   <li>Square brackets ("[]") are used to delimit conditional sub-groups. A sub-group is
+ *     conditional when all fields inside the sub-group have a null value. In the case, everything
+ *     between the brackets is skipped.</li>
+ * </ul>
+ */
+public class AdvancedMessageFormat {
+
+    /** Regex that matches "," but not "\," (escaped comma) */
+    static final Pattern COMMA_SEPARATOR_REGEX = Pattern.compile("(?<!\\\\),");
+
+    private static final Map<String, PartFactory> PART_FACTORIES
+        = new java.util.HashMap<String, PartFactory>();
+    private static final List<ObjectFormatter> OBJECT_FORMATTERS
+        = new java.util.ArrayList<ObjectFormatter>();
+    private static final Map<Object, Function> FUNCTIONS
+        = new java.util.HashMap<Object, Function>();
+
+    private CompositePart rootPart;
+
+    static {
+        Iterator<Object> iter;
+        iter = Service.providers(PartFactory.class);
+        while (iter.hasNext()) {
+            PartFactory factory = (PartFactory)iter.next();
+            PART_FACTORIES.put(factory.getFormat(), factory);
+        }
+        iter = Service.providers(ObjectFormatter.class);
+        while (iter.hasNext()) {
+            OBJECT_FORMATTERS.add((ObjectFormatter)iter.next());
+        }
+        iter = Service.providers(Function.class);
+        while (iter.hasNext()) {
+            Function function = (Function)iter.next();
+            FUNCTIONS.put(function.getName(), function);
+        }
+    }
+
+    /**
+     * Construct a new message format.
+     * @param pattern the message format pattern.
+     */
+    public AdvancedMessageFormat(CharSequence pattern) {
+        parsePattern(pattern);
+    }
+
+    private void parsePattern(CharSequence pattern) {
+        rootPart = new CompositePart(false);
+        StringBuffer sb = new StringBuffer();
+        parseInnerPattern(pattern, rootPart, sb, 0);
+    }
+
+    private int parseInnerPattern(CharSequence pattern, CompositePart parent,
+            StringBuffer sb, int start) {
+        assert sb.length() == 0;
+        int i = start;
+        int len = pattern.length();
+        loop:
+        while (i < len) {
+            char ch = pattern.charAt(i);
+            switch (ch) {
+            case '{':
+                if (sb.length() > 0) {
+                    parent.addChild(new TextPart(sb.toString()));
+                    sb.setLength(0);
+                }
+                i++;
+                int nesting = 1;
+                while (i < len) {
+                    ch = pattern.charAt(i);
+                    if (ch == '{') {
+                        nesting++;
+                    } else if (ch == '}') {
+                        nesting--;
+                        if (nesting == 0) {
+                            i++;
+                            break;
+                        }
+                    }
+                    sb.append(ch);
+                    i++;
+                }
+                parent.addChild(parseField(sb.toString()));
+                sb.setLength(0);
+                break;
+            case ']':
+                i++;
+                break loop; //Current composite is finished
+            case '[':
+                if (sb.length() > 0) {
+                    parent.addChild(new TextPart(sb.toString()));
+                    sb.setLength(0);
+                }
+                i++;
+                CompositePart composite = new CompositePart(true);
+                parent.addChild(composite);
+                i += parseInnerPattern(pattern, composite, sb, i);
+                break;
+            case '|':
+                if (sb.length() > 0) {
+                    parent.addChild(new TextPart(sb.toString()));
+                    sb.setLength(0);
+                }
+                parent.newSection();
+                i++;
+                break;
+            case '\\':
+                if (i < len - 1) {
+                    i++;
+                    ch = pattern.charAt(i);
+                }
+                sb.append(ch);
+                i++;
+                break;
+            default:
+                sb.append(ch);
+                i++;
+                break;
+            }
+        }
+        if (sb.length() > 0) {
+            parent.addChild(new TextPart(sb.toString()));
+            sb.setLength(0);
+        }
+        return i - start;
+    }
+
+    private Part parseField(String field) {
+        String[] parts = COMMA_SEPARATOR_REGEX.split(field, 3);
+        String fieldName = parts[0];
+        if (parts.length == 1) {
+            if (fieldName.startsWith("#")) {
+                return new FunctionPart(fieldName.substring(1));
+            } else {
+                return new SimpleFieldPart(fieldName);
+            }
+        } else {
+            String format = parts[1];
+            PartFactory factory = PART_FACTORIES.get(format);
+            if (factory == null) {
+                throw new IllegalArgumentException(
+                        "No PartFactory available under the name: " + format);
+            }
+            if (parts.length == 2) {
+                return factory.newPart(fieldName, null);
+            } else {
+                return factory.newPart(fieldName, parts[2]);
+            }
+        }
+    }
+
+    private static Function getFunction(String functionName) {
+        return FUNCTIONS.get(functionName);
+    }
+
+    /**
+     * Formats a message with the given parameters.
+     * @param params a Map of named parameters (Contents: <String, Object>)
+     * @return the formatted message
+     */
+    public String format(Map<String, Object> params) {
+        StringBuffer sb = new StringBuffer();
+        format(params, sb);
+        return sb.toString();
+    }
+
+    /**
+     * Formats a message with the given parameters.
+     * @param params a Map of named parameters (Contents: <String, Object>)
+     * @param target the target StringBuffer to write the formatted message to
+     */
+    public void format(Map<String, Object> params, StringBuffer target) {
+        rootPart.write(target, params);
+    }
+
+    /**
+     * Represents a message template part. This interface is implemented by various variants of
+     * the single curly braces pattern ({field}, {field,if,yes,no} etc.).
+     */
+    public interface Part {
+
+        /**
+         * Writes the formatted part to a string buffer.
+         * @param sb the target string buffer
+         * @param params the parameters to work with
+         */
+        void write(StringBuffer sb, Map<String, Object> params);
+
+        /**
+         * Indicates whether there is any content that is generated by this message part.
+         * @param params the parameters to work with
+         * @return true if the part has content
+         */
+        boolean isGenerated(Map<String, Object> params);
+    }
+
+    /**
+     * Implementations of this interface parse a field part and return message parts.
+     */
+    public interface PartFactory {
+
+        /**
+         * Creates a new part by parsing the values parameter to configure the part.
+         * @param fieldName the field name
+         * @param values the unparsed parameter values
+         * @return the new message part
+         */
+        Part newPart(String fieldName, String values);
+
+        /**
+         * Returns the name of the message part format.
+         * @return the name of the message part format
+         */
+        String getFormat();
+    }
+
+    /**
+     * Implementations of this interface format certain objects to strings.
+     */
+    public interface ObjectFormatter {
+
+        /**
+         * Formats an object to a string and writes the result to a string buffer.
+         * @param sb the target string buffer
+         * @param obj the object to be formatted
+         */
+        void format(StringBuffer sb, Object obj);
+
+        /**
+         * Indicates whether a given object is supported.
+         * @param obj the object
+         * @return true if the object is supported by the formatter
+         */
+        boolean supportsObject(Object obj);
+    }
+
+    /**
+     * Implementations of this interface do some computation based on the message parameters
+     * given to it. Note: at the moment, this has to be done in a local-independent way since
+     * there is no locale information.
+     */
+    public interface Function {
+
+        /**
+         * Executes the function.
+         * @param params the message parameters
+         * @return the function result
+         */
+        Object evaluate(Map<String, Object> params);
+
+        /**
+         * Returns the name of the function.
+         * @return the name of the function
+         */
+        Object getName();
+    }
+
+    private static class TextPart implements Part {
+
+        private String text;
+
+        public TextPart(String text) {
+            this.text = text;
+        }
+
+        public void write(StringBuffer sb, Map<String, Object> params) {
+            sb.append(text);
+        }
+
+        public boolean isGenerated(Map<String, Object> params) {
+            return true;
+        }
+
+        /** {@inheritDoc} */
+        public String toString() {
+            return this.text;
+        }
+    }
+
+    private static class SimpleFieldPart implements Part {
+
+        private String fieldName;
+
+        public SimpleFieldPart(String fieldName) {
+            this.fieldName = fieldName;
+        }
+
+        public void write(StringBuffer sb, Map<String, Object> params) {
+            if (!params.containsKey(fieldName)) {
+                throw new IllegalArgumentException(
+                        "Message pattern contains unsupported field name: " + fieldName);
+            }
+            Object obj = params.get(fieldName);
+            formatObject(obj, sb);
+        }
+
+        public boolean isGenerated(Map<String, Object> params) {
+            Object obj = params.get(fieldName);
+            return obj != null;
+        }
+
+        /** {@inheritDoc} */
+        public String toString() {
+            return "{" + this.fieldName + "}";
+        }
+    }
+
+    /**
+     * Formats an object to a string and writes the result to a string buffer. This method
+     * usually uses the object's <code>toString()</code> method unless there is an
+     * {@link ObjectFormatter} that supports the object. {@link ObjectFormatter}s are registered
+     * through the service provider mechanism defined by the JAR specification.
+     * @param obj the object to be formatted
+     * @param target the target string buffer
+     */
+    public static void formatObject(Object obj, StringBuffer target) {
+        if (obj instanceof String) {
+            target.append(obj);
+        } else {
+            boolean handled = false;
+            Iterator<ObjectFormatter> iter = OBJECT_FORMATTERS.iterator();
+            while (iter.hasNext()) {
+                ObjectFormatter formatter = iter.next();
+                if (formatter.supportsObject(obj)) {
+                    formatter.format(target, obj);
+                    handled = true;
+                    break;
+                }
+            }
+            if (!handled) {
+                target.append(String.valueOf(obj));
+            }
+        }
+    }
+
+    private static class FunctionPart implements Part {
+
+        private Function function;
+
+        public FunctionPart(String functionName) {
+            this.function = getFunction(functionName);
+            if (this.function == null) {
+                throw new IllegalArgumentException("Unknown function: " + functionName);
+            }
+        }
+
+        public void write(StringBuffer sb, Map<String, Object> params) {
+            Object obj = this.function.evaluate(params);
+            formatObject(obj, sb);
+        }
+
+        public boolean isGenerated(Map<String, Object> params) {
+            Object obj = this.function.evaluate(params);
+            return obj != null;
+        }
+
+        /** {@inheritDoc} */
+        public String toString() {
+            return "{#" + this.function.getName() + "}";
+        }
+    }
+
+    private static class CompositePart implements Part {
+
+        protected List<Part> parts = new java.util.ArrayList<Part>();
+        private boolean conditional;
+        private boolean hasSections;
+
+        public CompositePart(boolean conditional) {
+            this.conditional = conditional;
+        }
+
+        private CompositePart(List<Part> parts) {
+            this.parts.addAll(parts);
+            this.conditional = true;
+        }
+
+        public void addChild(Part part) {
+            if (part == null) {
+                throw new NullPointerException("part must not be null");
+            }
+            if (hasSections) {
+                CompositePart composite = (CompositePart) this.parts.get(this.parts.size() - 1);
+                composite.addChild(part);
+            } else {
+                this.parts.add(part);
+            }
+        }
+
+        public void newSection() {
+            if (!hasSections) {
+                List<Part> p = this.parts;
+                //Dropping into a different mode...
+                this.parts = new java.util.ArrayList<Part>();
+                this.parts.add(new CompositePart(p));
+                hasSections = true;
+            }
+            this.parts.add(new CompositePart(true));
+        }
+
+        public void write(StringBuffer sb, Map<String, Object> params) {
+            if (hasSections) {
+                Iterator<Part> iter = this.parts.iterator();
+                while (iter.hasNext()) {
+                    Part part = iter.next();
+                    if (part.isGenerated(params)) {
+                        part.write(sb, params);
+                        break;
+                    }
+                }
+            } else {
+                if (isGenerated(params)) {
+                    Iterator<Part> iter = this.parts.iterator();
+                    while (iter.hasNext()) {
+                        Part part = iter.next();
+                        part.write(sb, params);
+                    }
+                }
+            }
+        }
+
+        public boolean isGenerated(Map<String, Object> params) {
+            if (hasSections) {
+                Iterator<Part> iter = this.parts.iterator();
+                while (iter.hasNext()) {
+                    Part part = iter.next();
+                    if (part.isGenerated(params)) {
+                        return true;
+                    }
+                }
+                return false;
+            } else {
+                if (conditional) {
+                    Iterator<Part> iter = this.parts.iterator();
+                    while (iter.hasNext()) {
+                        Part part = iter.next();
+                        if (!part.isGenerated(params)) {
+                            return false;
+                        }
+                    }
+                }
+                return true;
+            }
+        }
+
+        /** {@inheritDoc} */
+        public String toString() {
+            return this.parts.toString();
+        }
+    }
+
+
+    static String unescapeComma(String string) {
+        return string.replaceAll("\\\\,", ",");
+    }
+}