package org.codehaus.plexus.metadata.merge.support;
   
   /**
    * All allowable tags in <code>components.xml</code> and their bindings to
    * {@link org.codehaus.plexus.metadata.merge.support.Mergeable} counterparts (if required).
    * <p>
    * <em>This implementation may change.</em></p>
    * <p>
    * TODO Might be an idea factor and set up the list of allowed tags here itself.</p>
   *
   * @author <a href='mailto:rahul.thakur.xdev@gmail.com'>Rahul Thakur</a>
   */
  public class PlexusXmlTag extends DescriptorTag {
      public static final PlexusXmlTag COMPONENT_SET =
              new PlexusXmlTag("component-set", false, ComponentSetElement.class);
  
      public static final PlexusXmlTag COMPONENTS = new PlexusXmlTag("components", true, ComponentsElement.class);
  
      public static final PlexusXmlTag COMPONENT = new PlexusXmlTag("component", true, ComponentElement.class);
  
      public static final PlexusXmlTag ROLE = new PlexusXmlTag("role");
  
      public static final PlexusXmlTag ROLE_HINT = new PlexusXmlTag("role-hint");
  
      public static final PlexusXmlTag FIELD_NAME = new PlexusXmlTag("field-name");
  
      public static final PlexusXmlTag IMPLEMENTATION = new PlexusXmlTag("implementation");
  
      public static final PlexusXmlTag LIFECYCLE_HANDLER = new PlexusXmlTag("lifecycle-handler", false, null);
  
      public static final PlexusXmlTag REQUIREMENTS = new PlexusXmlTag("requirements", true, RequirementsElement.class);
  
      public static final PlexusXmlTag CONFIGURATION =
              new PlexusXmlTag("configuration", true, ConfigurationElement.class);
  
      public static final PlexusXmlTag REQUIREMENT = new PlexusXmlTag("requirement", true, RequirementElement.class);
  
      /**
       * @param tagName
       * @param isMultipleAllowed
       * @param mergeableClass Class that wraps this tag (as JDom element) and provides for merging same tags.
       */
      private PlexusXmlTag(String tagName, boolean isMultipleAllowed, Class mergeableClass) {
          super(tagName, isMultipleAllowed, mergeableClass);
      }
  
      /**
       * By default we don't allow multiples of same tag names.
       *
       * @param tagName
       */
      private PlexusXmlTag(String tagName) {
          super(tagName, false, null);
      }
  }