/*
    * 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.custom.aliasbean;
  
  import java.io.IOException;
  
  import javax.el.ELException;
  import javax.faces.FacesException;
  import javax.faces.application.Application;
  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.webapp.UIComponentTag;
  
  /**
   * Tag handler used in facelets
   * 
   * @since 1.1.7
   * @author Leonardo Uribe (latest modification by $Author: lu4242 $)
   * @version $Revision: 691856 $ $Date: 2008-09-03 21:40:30 -0500 (mié, 03 sep 2008) $
   *
   */
  public class AliasBeanTagHandler extends ComponentHandler
  {
      private TagAttribute valueAttr;
      private TagAttribute aliasAttr;
  
      public AliasBeanTagHandler(ComponentConfig tagConfig)
      {
          super(tagConfig);
  
          valueAttr = getRequiredAttribute("value");
          aliasAttr = getRequiredAttribute("alias");
      }
  
      public void setAttributes(FaceletContext ctx, Object instance)
      {
          super.setAttributes(ctx, instance);
          
          Application app = ctx.getFacesContext().getApplication();
          
          AliasBean aliasBean = (AliasBean) instance;
  
          String value = valueAttr.getValue();
          if (UIComponentTag.isValueReference(value))
          {
              aliasBean.setValueBinding("value", app.createValueBinding(valueAttr
                      .getValue()));
          }
          else
          {
              aliasBean.setValue(value);
          }
  
          String alias = aliasAttr.getValue();
          if (UIComponentTag.isValueReference(alias))
          {
              aliasBean.setValueBinding("alias", app.createValueBinding(aliasAttr
                      .getValue()));
          }
          else
          {
              aliasBean.setAlias(alias);
          }
      }
      
      public void applyNextHandler(FaceletContext ctx, UIComponent component)
              throws IOException, FacesException, ELException
      {
          AliasBean aliasBean = (AliasBean) component;
          aliasBean.makeAlias(ctx.getFacesContext());
          super.applyNextHandler(ctx, component);
          aliasBean.removeAlias(ctx.getFacesContext());
      }
      
      /**
       * We have to add the children to the parent, for ensure proper
       * behavior between aliasBean and aliasBeansScope.
       * 
       */
      public void onComponentCreated(FaceletContext faceletcontext,
             UIComponent component, UIComponent parent)    
     {
         parent.getChildren().add(component);
     }
 
 }