/*
    * 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.composite;
  
  import java.beans.BeanDescriptor;
  import java.beans.IntrospectionException;
  import java.beans.PropertyDescriptor;
  import java.io.IOException;
  import java.util.HashMap;
  import java.util.Map;
  import java.util.logging.Level;
  import java.util.logging.Logger;
  
  import javax.faces.component.UIComponent;
  import javax.faces.view.Location;
  import javax.faces.view.facelets.FaceletContext;
  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;
  import org.apache.myfaces.view.facelets.AbstractFaceletContext;
  import org.apache.myfaces.view.facelets.FaceletCompositionContext;
  
  /**
   * @author Leonardo Uribe (latest modification by $Author$)
   * @version $Revision$ $Date$
   */
  @JSFFaceletTag(name="composite:implementation")
  public class ImplementationHandler extends TagHandler
  {
      private static final Logger log = Logger.getLogger(ImplementationHandler.class.getName());
      
      public final static String NAME = "implementation";
  
      public ImplementationHandler(TagConfig config)
      {
          super(config);
      }
  
      public void apply(FaceletContext ctx, UIComponent parent)
              throws IOException
      {
          if (!((AbstractFaceletContext)ctx).isBuildingCompositeComponentMetadata())
          {
              // If this tag is found in a facelet, the compiler has trimmed all
              // tags outside this one excluding composite:interface, so "parent"
              // is a component used as value for the facet key
              // UIComponent.COMPOSITE_FACET_NAME in a composite component. 
              nextHandler.apply(ctx, parent);
          }
          else
          {
              UIComponent compositeBaseParent
                      = FaceletCompositionContext.getCurrentInstance(ctx).getCompositeComponentFromStack();
              // Register the facet UIComponent.COMPOSITE_FACET_NAME
              CompositeComponentBeanInfo beanInfo = 
                  (CompositeComponentBeanInfo) compositeBaseParent.getAttributes()
                  .get(UIComponent.BEANINFO_KEY);
              
              if (beanInfo == null)
              {
                  if (log.isLoggable(Level.SEVERE))
                  {
                      log.severe("Cannot find composite bean descriptor UIComponent.BEANINFO_KEY ");
                  }
                  return;
              }
              
              BeanDescriptor beanDescriptor = beanInfo.getBeanDescriptor();
              
              Map<String, PropertyDescriptor> facetPropertyDescriptorMap = 
                  (Map<String, PropertyDescriptor>) beanDescriptor.getValue(UIComponent.FACETS_KEY);
          
              if (facetPropertyDescriptorMap == null)
              {
                  facetPropertyDescriptorMap = new HashMap<String, PropertyDescriptor>();
                  beanDescriptor.setValue(UIComponent.FACETS_KEY, facetPropertyDescriptorMap);
              }
              
              if (!facetPropertyDescriptorMap.containsKey(UIComponent.COMPOSITE_FACET_NAME))
              {
                  try
                 {
                     facetPropertyDescriptorMap.put(UIComponent.COMPOSITE_FACET_NAME, 
                             new CompositeComponentPropertyDescriptor(UIComponent.COMPOSITE_FACET_NAME));
                 }
                 catch (IntrospectionException e)
                 {
                     if (log.isLoggable(Level.SEVERE))
                     {
                         log.log(Level.SEVERE, "Cannot create PropertyDescriptor for facet ",e);
                     }
                     throw new TagException(tag,e);
                 }
             }
             
             // Pass to nextHandler, to give the chance to cc:insertChildren, cc:insertFacet and cc:renderFacet
             // to save metadata information.
             nextHandler.apply(ctx, parent);
         }
     }
     
     public Location getLocation()
     {
         return this.tag.getLocation();
     }
 }