/*

  * 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;

 import javax.faces.view.facelets.Tag;

 import javax.faces.view.facelets.TagDecorator;

 import org.apache.myfaces.view.facelets.util.ParameterCheck;

 /**

  * A TagDecorator that is composed of 1 or more TagDecorator instances. It uses the chain of responsibility pattern to

  * stop processing if any of the TagDecorators return a value other than null.

  * 

  * @author Jacob Hookom

  * @version $Id$

  */

 public final class CompositeTagDecorator implements TagDecorator

 {

     private final TagDecorator[] decorators;

     public CompositeTagDecorator(TagDecorator[] decorators)

     {

         ParameterCheck.notNull("decorators", decorators);

         this.decorators = decorators;

     }

     /**

      * Uses the chain of responsibility pattern to stop processing if any of the TagDecorators return a value other than

      * null.

      * 

      * @see javax.faces.view.facelets.TagDecorator#decorate(javax.faces.view.facelets.Tag)

      */

     public Tag decorate(Tag tag)

     {

         Tag t = null;

         for (int i = 0; i < this.decorators.length; i++)

         {

             t = this.decorators[i].decorate(tag);

             if (t != null)

             {

                 return t;

             }

         }

         return tag;

     }

 }