/*

  * 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;

     }

 }