/*
 * Copyright 2005-2010 the original author or authors.
 * 
 * Licensed 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.wamblee.wicket.behavior;

import java.util.ArrayList;
import java.util.List;

import org.apache.wicket.markup.html.WebPage;
import org.apache.wicket.protocol.http.WebResponse;

/**
 * Implements a composite page behavior which invokes all behaviors in the order they were
 * added. 
 * 
 * To use this in an arbitrary page, override <code>onBeforeRender()</code>, 
 * <code>setHeaders()</code> and <code>onAfterRender</code> in the page and delegate to the 
 * corresponding methods in this class.  
 * 
 * @author Erik Brakkee
 */
public class CompositePageBehavior implements PageBehavior {

    private List<PageBehavior> behaviors; 
    
    /**
     * Constructs the compositie.
     */
    public CompositePageBehavior() { 
        behaviors = new ArrayList<PageBehavior>();
    }
    
    /**
     * Adds a behavior. 
     * @param aBehavior Behavior 
     */
    public void add(PageBehavior aBehavior) { 
        behaviors.add(aBehavior);
    }
    
    @Override
    public void onAfterRender(WebPage aPage) {
        for (PageBehavior behavior: behaviors) { 
            behavior.onAfterRender(aPage);
        }
    }

    @Override
    public void onBeforeRender(WebPage aPage) {
        for (PageBehavior behavior: behaviors) { 
            behavior.onBeforeRender(aPage);
        }
    }

    @Override
    public void setHeaders(WebPage aPage, WebResponse aResponse) {
        for (PageBehavior behavior: behaviors) { 
            behavior.setHeaders(aPage, aResponse);
        }
    }

}