/*

  * 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.io.IOException;

 import java.util.ArrayList;

 import java.util.List;

 import java.util.logging.Level;

 import java.util.logging.Logger;

 import javax.faces.component.UIComponent;

 import javax.faces.view.facelets.ComponentConfig;

 import javax.faces.view.facelets.ComponentHandler;

 import javax.faces.view.facelets.FaceletContext;

 import javax.faces.view.facelets.TagAttribute;

 import javax.faces.view.facelets.TagException;

 import org.apache.myfaces.buildtools.maven2.plugin.builder.annotation.JSFFaceletAttribute;

 import org.apache.myfaces.buildtools.maven2.plugin.builder.annotation.JSFFaceletTag;

 import org.apache.myfaces.view.facelets.AbstractFaceletContext;

 import org.apache.myfaces.view.facelets.FaceletCompositionContext;

 /**

  * Render the facet defined on the composite component body to the current location

  * 

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

  * @version $Revision$ $Date$

  */

 @JSFFaceletTag(name="composite:renderFacet")

 public class RenderFacetHandler extends ComponentHandler

 {

     private static final Logger log = Logger.getLogger(RenderFacetHandler.class.getName());

     public static final String RENDER_FACET_USED = "org.apache.myfaces.RENDER_FACET_USED";

     /**

      * The name that identify the current facet.

      */

     @JSFFaceletAttribute(name="name",

             className="javax.el.ValueExpression",

             deferredValueType="java.lang.String",

             required=true)

     protected final TagAttribute _name;

     /**

      * Define if the facet to be inserted is required or not for every instance of

      * this composite component.

      */

     @JSFFaceletAttribute(name="required",

             className="javax.el.ValueExpression",

             deferredValueType="boolean")

     protected final TagAttribute _required;

     public RenderFacetHandler(ComponentConfig config)

     {

         super(config);

         _name = getRequiredAttribute("name");

         _required = getAttribute("required");

     }

     @SuppressWarnings("unchecked")

     @Override

     public void apply(FaceletContext ctx, UIComponent parent)

             throws IOException

     {

         if (((AbstractFaceletContext)ctx).isBuildingCompositeComponentMetadata())

         {

             String facetName = _name.getValue(ctx);

             UIComponent compositeBaseParent

                     = FaceletCompositionContext.getCurrentInstance(ctx).getCompositeComponentFromStack();

             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(); 

             List<String> facetList = (List<String>) beanDescriptor.getValue(RENDER_FACET_USED);

             if (facetList == null)

             {

                 //2. If not found create it and set

                 facetList = new ArrayList<String>();

                 beanDescriptor.setValue(

                         RENDER_FACET_USED,

                         facetList);

             }

             facetList.add(facetName);

             // Do not call super.apply(ctx, parent), because it forces component creation,

             // and in this step it is not necessary. Also, it changes the order of 

             // the generated ids.

         }

         else

         {

             super.apply(ctx, parent);

         }

     }

     @Override

     public void onComponentPopulated(FaceletContext ctx, UIComponent c,

             UIComponent parent)

     {

         if (!((AbstractFaceletContext)ctx).isBuildingCompositeComponentMetadata())

         {

             UIComponent parentCompositeComponent

                     = FaceletCompositionContext.getCurrentInstance(ctx).getCompositeComponentFromStack();

             String facetName = _name.getValue(ctx);

             if (_required != null && _required.getBoolean(ctx) && parentCompositeComponent.getFacet(facetName) == null)

             {

                 throw new TagException(this.tag, "Cannot find facet with name '"+facetName+"' in composite component");

             }

             c.getAttributes().put(UIComponent.FACETS_KEY, facetName);

         }

     }

 }