/*
    * 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.taglib.core;
  
  import javax.el.ValueExpression;
  import javax.faces.component.ActionSource;
  import javax.faces.component.UIComponent;
  import javax.faces.event.ActionListener;
  import javax.faces.webapp.UIComponentClassicTagBase;
  import javax.servlet.jsp.JspException;
  import javax.servlet.jsp.tagext.TagSupport;
  
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  
  import org.apache.myfaces.buildtools.maven2.plugin.builder.annotation.JSFJspAttribute;
  import org.apache.myfaces.buildtools.maven2.plugin.builder.annotation.JSFJspTag;
  import org.apache.myfaces.event.SetPropertyActionListener;
  
  /**
   * @author Dennis Byrne
   * @since 1.2
   */
  @JSFJspTag(
          name="f:setPropertyActionListener",
          bodyContent="empty")
  public class SetPropertyActionListenerTag extends TagSupport
  {
      
      private static final Log log = LogFactory.getLog(SetPropertyActionListenerTag.class);
      
      private ValueExpression target;
      
      private ValueExpression value;
  
      public int doStartTag() throws JspException 
      {
          
          if(log.isDebugEnabled())
              log.debug("JSF 1.2 Spec : Create a new instance of the ActionListener");
  
          ActionListener actionListener = new SetPropertyActionListener(target, value);
          
          UIComponentClassicTagBase tag = UIComponentClassicTagBase.getParentUIComponentClassicTagBase(pageContext);
          
          if(tag == null)
              throw new JspException("Could not find a " +
                      "parent UIComponentClassicTagBase ... is this " +
                      "tag in a child of a UIComponentClassicTagBase?");
          
          if(tag.getCreated())
          {
              
              UIComponent component = tag.getComponentInstance();
              
              if(component == null)
                  throw new JspException(" Could not locate a UIComponent " +
                          "for a UIComponentClassicTagBase w/ a " +
                          "JSP id of " + tag.getJspId());
              
              if( ! ( component instanceof ActionSource ) )
                  throw new JspException("Component w/ id of " + component.getId() 
                          + " is associated w/ a tag w/ JSP id of " + tag.getJspId() 
                          + ". This component is of type " + component.getClass() 
                          + ", which is not an " + ActionSource.class );
              
              if(log.isDebugEnabled())
                  log.debug(" ... register it with the UIComponent " +
                          "instance associated with our most immediately " +
                          "surrounding UIComponentTagBase");
              
              ((ActionSource)component).addActionListener(actionListener);
              
          }
          
          return SKIP_BODY;
      }
      
      /**
       * ValueExpression for the destination of the value attribute.
       */
      @JSFJspAttribute(required=true)
      public ValueExpression getTarget()
     {
         return target;
     }
 
     public void setTarget(ValueExpression target)
     {
         this.target = target;
     }
 
     /**
      * ValueExpression for the value of the target attribute.
      * 
      * @return
      */
     @JSFJspAttribute(required=true)
     public ValueExpression getValue()
     {
         return value;
     }
 
     public void setValue(ValueExpression value)
     {
         this.value = value;
     }
     
     public void release() 
     {
         target = null;
         value = null;
     }
     
 }