/*

  * 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.el.unified.resolver.implicitobject;

 import java.beans.FeatureDescriptor;

 import java.util.List;

 import javax.el.ELContext;

 import javax.faces.component.UIComponent;

 import javax.faces.context.FacesContext;

 import org.apache.myfaces.view.facelets.el.CompositeComponentELUtils;

 /**

  * Encapsulates information needed by the ImplicitObjectResolver

  * 

  * @author Leonardo Uribe (latest modification by $Author$)

  * @version $Revision$ $Date$

  */

 public class CompositeComponentImplicitObject extends ImplicitObject

 {

     private static final String NAME = "cc";

     /** Creates a new instance of CompositeComponentImplicitObjectImplicitObject */

     public CompositeComponentImplicitObject()

     {

     }

     @Override

     public Object getValue(ELContext context)

     {

         FacesContext facesContext = facesContext(context);

         // Look for the attribute set by LocationValueExpression

         // or LocationMethodExpression on the FacesContext

         List<UIComponent> list = (List<UIComponent>) facesContext.getAttributes()

                 .get(CompositeComponentELUtils.CURRENT_COMPOSITE_COMPONENT_KEY);

         UIComponent cc = null;

         if (list != null && !list.isEmpty())

         {

             cc = list.get(list.size()-1);

         }

         if (cc == null)

         {

             // take the composite component from the stack

             cc = UIComponent.getCurrentCompositeComponent(facesContext(context));

         }

         return cc;

     }

     @Override

     public String getName()

     {

         return NAME;

     }

     @Override

     public Class<?> getType()

     {

         return null;

     }

     @Override

     public FeatureDescriptor getDescriptor()

     {

         return makeDescriptor(NAME,

                 "Represents the composite component most recently pushed using UIComponent.pushComponentToEL",

                 UIComponent.class);

     }

 }