/*
    * 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.
   */
  package org.apache.myfaces.view.facelets.tag.jsf.core;
  
  import java.io.IOException;
  
  import javax.el.ELException;
  import javax.faces.FacesException;
  import javax.faces.component.UIComponent;
  import javax.faces.view.facelets.FaceletContext;
  import javax.faces.view.facelets.FaceletException;
  import javax.faces.view.facelets.TagAttribute;
  import javax.faces.view.facelets.TagConfig;
  import javax.faces.view.facelets.TagException;
  import javax.faces.view.facelets.TagHandler;
  
  import org.apache.myfaces.buildtools.maven2.plugin.builder.annotation.JSFFaceletTag;
  
  /**
   * Register a named facet on the UIComponent associated with the closest parent UIComponent custom action. <p/> See <a
   * target="_new" href="http://java.sun.com/j2ee/javaserverfaces/1.1_01/docs/tlddocs/f/facet.html">tag documentation</a>.
   * 
   * @author Jacob Hookom
   * @version $Id$
   */
  @JSFFaceletTag(
          name = "f:facet",
          bodyContent = "JSP", 
          tagClass="javax.faces.webapp.FacetTag")
  public final class FacetHandler extends TagHandler 
      implements javax.faces.view.facelets.FacetHandler
  {
  
      public static final String KEY = "facelets.FACET_NAME";
  
      protected final TagAttribute name;
  
      public FacetHandler(TagConfig config)
      {
          super(config);
          this.name = this.getRequiredAttribute("name");
      }
  
      /*
       * (non-Javadoc)
       * 
       * @see javax.faces.view.facelets.FaceletHandler#apply(javax.faces.view.facelets.FaceletContext, javax.faces.component.UIComponent)
       */
      public void apply(FaceletContext ctx, UIComponent parent) throws IOException, FacesException, FaceletException,
              ELException
      {
          if (parent == null)
          {
              throw new TagException(this.tag, "Parent UIComponent was null");
          }
          parent.getAttributes().put(KEY, this.name.getValue(ctx));
          try
          {
              this.nextHandler.apply(ctx, parent);
          }
          finally
          {
              parent.getAttributes().remove(KEY);
          }
      }
  
      public String getFacetName(FaceletContext ctx)
      {
          return this.name.getValue(ctx);
      }
  }