/*
    * 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 javax.el.ValueExpression;
  import javax.faces.component.UIComponent;
  import javax.faces.webapp.UIComponentELTag;
  import javax.servlet.jsp.JspException;
  
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  
  /**
   * @author Sylvain Vieujot (latest modification by $Author: lu4242 $)
   * @version $Revision: 664402 $ $Date: 2008-06-07 16:59:02 -0500 (Sat, 07 Jun 2008) $
   */
  public class AliasBeanTag extends UIComponentELTag
  {
  
      private Log log = LogFactory.getLog(AliasBeanTag.class);
      /**
       * Construct an instance of the AliasBeanELTag.
       */
      public AliasBeanTag()
      {
      }
      
      public int doStartTag() throws JspException
      {
          int retVal= super.doStartTag();
  
          UIComponent comp = getComponentInstance();
  
          if(comp instanceof AliasBean)
          {
              ((AliasBean) comp).makeAlias(getFacesContext());
          }
          else
          {
              log.warn("associated component is no aliasBean");
          }
  
          return retVal;
      }
  
      public int doEndTag() throws JspException
      {
          UIComponent comp = getComponentInstance();
  
          if(comp instanceof AliasBean)
          {
              ((AliasBean) comp).removeAlias(getFacesContext());
          }
          else
          {
              log.warn("associated component is no aliasBean");
          }
  
          return super.doEndTag();
      }
      
      @Override
      public String getComponentType()
      {
          return "org.apache.myfaces.AliasBean";
      }
  
      public String getRendererType()
      {
          return null;
      }
  
      private ValueExpression _alias;
  
      public void setAlias(ValueExpression alias)
      {
          _alias = alias;
      }
  
      private ValueExpression _value;
  
      public void setValue(ValueExpression value)
      {
         _value = value;
     }
 
     @Override
     protected void setProperties(UIComponent component)
     {
         if (!(component instanceof AliasBean))
         {
             throw new IllegalArgumentException("Component "
                     + component.getClass().getName() + " is no AliasBean");
         }
         AliasBean comp = (AliasBean) component;
 
         super.setProperties(component);
 
         if (_alias != null)
         {
             comp.setValueExpression("alias", _alias);
         }
         if (_value != null)
         {
             comp.setValueExpression("value", _value);
         }
     }
 
     @Override
     public void release()
     {
         super.release();
         _alias = null;
         _value = null;
     }
 }