add the column CHARACTERISTICS.ENABLED

sonar-core/src/main/java/org/sonar/jpa/entity/SchemaMigration.java

 public class SchemaMigration {
 
   public final static int VERSION_UNKNOWN = -1;
-  public static final int LAST_VERSION = 138;
+  public static final int LAST_VERSION = 139;
 
   public final static String TABLE_NAME = "schema_migrations";
 

sonar-core/src/test/resources/org/sonar/core/qualitymodel/DefaultModelFinderTest/noDefinitionsToRegister-result.xml

   <quality_models id="1" name="M1" />
   <quality_models id="2" name="M2" />
 
-  <characteristics id="1" kee="M1C1" name="M1C1" quality_model_id="1" rule_id="[null]" characteristic_order="1" depth="1" description="[null]" />
-  <characteristics id="2" kee="M1C2" name="M1C2" quality_model_id="1" rule_id="[null]" characteristic_order="1" depth="2" description="[null]" />
-  <characteristics id="3" kee="M2C1" name="M2C1" quality_model_id="2" rule_id="[null]" characteristic_order="1" depth="1" description="[null]"/>
+  <characteristics id="1" kee="M1C1" name="M1C1" quality_model_id="1" rule_id="[null]" characteristic_order="1" depth="1" description="[null]" enabled="true" />
+  <characteristics id="2" kee="M1C2" name="M1C2" quality_model_id="1" rule_id="[null]" characteristic_order="1" depth="2" description="[null]" enabled="true" />
+  <characteristics id="3" kee="M2C1" name="M2C1" quality_model_id="2" rule_id="[null]" characteristic_order="1" depth="1" description="[null]" enabled="true"/>
 
   <characteristic_edges child_id="2" parent_id="1"/>
 </dataset>

sonar-core/src/test/resources/org/sonar/core/qualitymodel/DefaultModelFinderTest/registerOnlyNewDefinitions-result.xml

   <!-- NEW MODEL -->
   <quality_models id="3" name="NEWMODEL" />
 
-  <characteristics id="1" kee="M1C1" name="M1C1" quality_model_id="1" rule_id="[null]" characteristic_order="1" depth="1" description="[null]" />
-  <characteristics id="2" kee="M1C2" name="M1C2" quality_model_id="1" rule_id="[null]" characteristic_order="1" depth="2" description="[null]" />
-  <characteristics id="3" kee="M2C1" name="M2C1" quality_model_id="2" rule_id="[null]" characteristic_order="1" depth="1" description="[null]"/>
+  <characteristics id="1" kee="M1C1" name="M1C1" quality_model_id="1" rule_id="[null]" characteristic_order="1" depth="1" description="[null]" enabled="true" />
+  <characteristics id="2" kee="M1C2" name="M1C2" quality_model_id="1" rule_id="[null]" characteristic_order="1" depth="2" description="[null]" enabled="true" />
+  <characteristics id="3" kee="M2C1" name="M2C1" quality_model_id="2" rule_id="[null]" characteristic_order="1" depth="1" description="[null]" enabled="true"/>
 
   <characteristic_edges child_id="2" parent_id="1"/>
 </dataset>

sonar-core/src/test/resources/org/sonar/core/qualitymodel/DefaultModelFinderTest/reset-result.xml

   <quality_models id="2" name="M2" />
   <quality_models id="3" name="M1" />
 
-  <!--<characteristics id="1" kee="M1C1" name="M1C1" quality_model_id="1" rule_id="[null]" characteristic_order="1" depth="1" description="[null]" />-->
-  <!--<characteristics id="2" kee="M1C2" name="M1C2" quality_model_id="1" rule_id="[null]" characteristic_order="1" depth="2"  description="[null]"/>-->
-  <characteristics id="3" kee="M2C1" name="M2C1" quality_model_id="2" rule_id="[null]" characteristic_order="1" depth="1" description="[null]" />
-  <characteristics id="4" kee="NEWM1C1A" name="NEWM1C1A" quality_model_id="3" rule_id="[null]" characteristic_order="1" depth="2" description="[null]"/>
-  <characteristics id="5" kee="NEWM1C1" name="NEWM1C1" quality_model_id="3" rule_id="[null]" characteristic_order="1" depth="1" description="[null]"/>
-  <characteristics id="6" kee="NEWM1C2" name="NEWM1C2" quality_model_id="3" rule_id="[null]" characteristic_order="2" depth="1" description="[null]"/>
+  <!--<characteristics id="1" kee="M1C1" name="M1C1" quality_model_id="1" rule_id="[null]" characteristic_order="1" depth="1" description="[null]" enabled="true" />-->
+  <!--<characteristics id="2" kee="M1C2" name="M1C2" quality_model_id="1" rule_id="[null]" characteristic_order="1" depth="2"  description="[null]" enabled="true"/>-->
+  <characteristics id="3" kee="M2C1" name="M2C1" quality_model_id="2" rule_id="[null]" characteristic_order="1" depth="1" description="[null]" enabled="true" />
+  <characteristics id="4" kee="NEWM1C1A" name="NEWM1C1A" quality_model_id="3" rule_id="[null]" characteristic_order="1" depth="2" description="[null]" enabled="true"/>
+  <characteristics id="5" kee="NEWM1C1" name="NEWM1C1" quality_model_id="3" rule_id="[null]" characteristic_order="1" depth="1" description="[null]" enabled="true"/>
+  <characteristics id="6" kee="NEWM1C2" name="NEWM1C2" quality_model_id="3" rule_id="[null]" characteristic_order="2" depth="1" description="[null]" enabled="true"/>
 
   <!--<characteristic_edges child_id="2" parent_id="1"/>-->
   <characteristic_edges child_id="4" parent_id="5"/>

sonar-core/src/test/resources/org/sonar/core/qualitymodel/DefaultModelFinderTest/shared.xml

   <quality_models id="1" name="M1" />
   <quality_models id="2" name="M2" />
 
-  <characteristics id="1" kee="M1C1" name="M1C1" quality_model_id="1" rule_id="[null]" characteristic_order="1" depth="1" description="[null]" />
-  <characteristics id="2" kee="M1C2" name="M1C2" quality_model_id="1" rule_id="[null]" characteristic_order="1" depth="2" description="[null]" />
-  <characteristics id="3" kee="M2C1" name="M2C1" quality_model_id="2" rule_id="[null]" characteristic_order="1" depth="1" description="[null]"/>
+  <characteristics id="1" kee="M1C1" name="M1C1" quality_model_id="1" rule_id="[null]" characteristic_order="1" depth="1" description="[null]" enabled="true" />
+  <characteristics id="2" kee="M1C2" name="M1C2" quality_model_id="1" rule_id="[null]" characteristic_order="1" depth="2" description="[null]" enabled="true" />
+  <characteristics id="3" kee="M2C1" name="M2C1" quality_model_id="2" rule_id="[null]" characteristic_order="1" depth="1" description="[null]" enabled="true"/>
 
   <characteristic_edges child_id="2" parent_id="1"/>
 </dataset>

sonar-core/src/test/resources/org/sonar/core/qualitymodel/ModelTest/saveModelAndCharacteristics.xml

 <dataset>
   <quality_models id="1" name="initial" />
-  <characteristics id="1" kee="FAKE" name="fake" quality_model_id="1" rule_id="[null]" characteristic_order="1" depth="1" description="[null]" />
+  <characteristics id="1" kee="FAKE" name="fake" quality_model_id="1" rule_id="[null]" characteristic_order="1" depth="1" description="[null]" enabled="true" />
 </dataset>

sonar-core/src/test/resources/org/sonar/core/qualitymodel/ModelTest/testGraphOfCharacteristics.xml

 <dataset>
   <quality_models id="1" name="initial" />
   
-  <characteristics id="1" kee="FAKE1" name="fake1" quality_model_id="1" rule_id="[null]"  characteristic_order="1" depth="1" description="[null]"/>
-  <characteristics id="2" kee="FAKE2" name="fake2" quality_model_id="1" rule_id="[null]" characteristic_order="2" depth="1" description="[null]" />
+  <characteristics id="1" kee="FAKE1" name="fake1" quality_model_id="1" rule_id="[null]"  characteristic_order="1" depth="1" description="[null]" enabled="true"/>
+  <characteristics id="2" kee="FAKE2" name="fake2" quality_model_id="1" rule_id="[null]" characteristic_order="2" depth="1" description="[null]" enabled="true" />
 
   <characteristic_edges child_id="2" parent_id="1"/>
 </dataset>

sonar-core/src/test/resources/org/sonar/core/qualitymodel/ModelTest/testTreeOfCharacteristics.xml

 <dataset>
   <quality_models id="1" name="initial" />
-  <characteristics id="1" kee="FAKE" name="fake" quality_model_id="1" rule_id="[null]" characteristic_order="1" depth="1" description="[null]" />
+  <characteristics id="1" kee="FAKE" name="fake" quality_model_id="1" rule_id="[null]" characteristic_order="1" depth="1" description="[null]" enabled="true" />
   <characteristic_edges child_id="1" parent_id="1"/>
 </dataset>

sonar-plugin-api/src/main/java/org/sonar/api/qualitymodel/Characteristic.java

   @Column(name = "description", nullable = true, length = 4000)
   private String description;
 
+  @Column(name = "enabled", updatable = true, nullable = true)
+  private Boolean enabled = Boolean.TRUE;
+
   @ManyToMany
   @JoinTable(
       name = "characteristic_edges",
     return this;
   }
 
+  public Boolean getEnabled() {
+    return enabled;
+  }
+
+  public Characteristic setEnabled(Boolean b) {
+    this.enabled = b;
+    return this;
+  }
+
   public Characteristic addChildren(Characteristic... list) {
     if (list != null) {
       for (Characteristic c : list) {

sonar-plugin-api/src/main/java/org/sonar/api/qualitymodel/Model.java

  */
 package org.sonar.api.qualitymodel;
 
+import com.google.common.collect.Lists;
 import org.apache.commons.lang.StringUtils;
 import org.apache.commons.lang.builder.ToStringBuilder;
 import org.apache.commons.lang.builder.ToStringStyle;
   private String name;
 
   @OneToMany(mappedBy = "model", cascade = CascadeType.ALL, fetch = FetchType.LAZY)
-  private List<Characteristic> characteristics = new ArrayList<Characteristic>();
+  private List<Characteristic> characteristics = Lists.newArrayList();
 
   /**
    * Use the factory method <code>Model</code>
     return c;
   }
 
+  /**
+   * @return enabled characteristics
+   */
   public List<Characteristic> getCharacteristics() {
-    return characteristics;
+    return getCharacteristics(true);
+  }
+
+  public List<Characteristic> getCharacteristics(boolean onlyEnabled) {
+    if (!onlyEnabled) {
+      return characteristics;
+    }
+    List<Characteristic> result = Lists.newArrayList();
+    for (Characteristic characteristic : characteristics) {
+      if (characteristic.getEnabled()) {
+        result.add(characteristic);
+      }
+    }
+    return result;
   }
 
+  /**
+   * Search for an ENABLED characteristic by its key.
+   */
   public Characteristic getCharacteristicByKey(String key) {
-    for (Characteristic characteristic : getCharacteristics()) {
-      if (StringUtils.equals(key, characteristic.getKey())) {
+    for (Characteristic characteristic : characteristics) {
+      if (characteristic.getEnabled() && StringUtils.equals(key, characteristic.getKey())) {
         return characteristic;
       }
     }
     return null;
   }
 
+  /**
+   * Search for ENABLED characteristics by their depth.
+   */
   public List<Characteristic> getCharacteristicsByDepth(int depth) {
-    List<Characteristic> result = new ArrayList<Characteristic>();
+    List<Characteristic> result = Lists.newArrayList();
     for (Characteristic c : characteristics) {
-      if (c.getDepth()==depth) {
+      if (c.getEnabled() && c.getDepth()==depth) {
         result.add(c);
       }
     }
     return result;
   }
 
+  /**
+   * Search for an ENABLED characteristic by its name.
+   */
   public Characteristic getCharacteristicByName(String name) {
-    for (Characteristic characteristic : getCharacteristics()) {
-      if (StringUtils.equals(name, characteristic.getName())) {
+    for (Characteristic characteristic : characteristics) {
+      if (characteristic.getEnabled() && StringUtils.equals(name, characteristic.getName())) {
         return characteristic;
       }
     }

sonar-server/src/main/webapp/WEB-INF/app/models/characteristic.rb

 
   belongs_to :rule
   belongs_to :quality_model
+  
+  validates_uniqueness_of :name, :scope => :quality_model_id, :case_sensitive => false, :if => Proc.new { |c| c.rule_id.nil? }
+  validates_length_of :name, :in => 1..100, :allow_blank => false, :if => Proc.new { |c| c.rule_id.nil? }
+  validates_presence_of :quality_model
 
   def root?
     depth==1

sonar-server/src/main/webapp/WEB-INF/db/migrate/138_add_characteristic_description.rb

 
   def self.up
     add_column 'characteristics', 'description', :string, :null => true, :limit => 4000
-    Characteristic.reset_column_information
   end
 
 end

sonar-server/src/main/webapp/WEB-INF/db/migrate/139_add_characteristic_enabled.rb

+#
+# Sonar, entreprise quality control 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
+#
+class AddCharacteristicEnabled < ActiveRecord::Migration
+
+  def self.up
+    add_column 'characteristics', 'enabled', :boolean, :null => true
+    Characteristic.reset_column_information
+  end
+
+end