org.apache.myfaces.view.facelets.tag.CompositeTagDecorator Maven / Gradle / Ivy
/*
* 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: CompositeTagDecorator.java,v 1.5 2008/07/13 19:01:35 rlubke Exp $
*/
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 org.apache.myfaces.view.facelets.tag.TagDecorator#decorate(org.apache.myfaces.view.facelets.tag.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;
}
}