org.ajax4jsf.framework.ajax.InitPhaseListener Maven / Gradle / Ivy

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Ajax4jsf is an open source extension to the JavaServer Faces standard that adds AJAX capability to JSF applications without requiring the writing of any JavaScript.
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/**
 * Licensed under the Common Development and Distribution License,
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.sun.com/cddl/
 *   
 * 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.ajax4jsf.framework.ajax;

import java.util.Iterator;

import javax.faces.FactoryFinder;
import javax.faces.application.Application;
import javax.faces.application.StateManager;
import javax.faces.application.ViewHandler;
import javax.faces.context.FacesContext;
import javax.faces.event.PhaseEvent;
import javax.faces.event.PhaseId;
import javax.faces.event.PhaseListener;
import javax.faces.lifecycle.Lifecycle;
import javax.faces.lifecycle.LifecycleFactory;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * One time called listener, for initialize framework at first request.
 * @author shura
 *
 */
public class InitPhaseListener implements PhaseListener {
	
	private boolean removed= false;
	private boolean initialized = false;
	
	private static final Log log = LogFactory.getLog(InitPhaseListener.class);

	/* (non-Javadoc)
	 * @see javax.faces.event.PhaseListener#afterPhase(javax.faces.event.PhaseEvent)
	 */
	public synchronized void afterPhase(PhaseEvent event) {
        if (!removed) {
        	if(log.isDebugEnabled()){
        		log.debug("Remove init phase listener from factories");
        	}
            LifecycleFactory factory = (LifecycleFactory)
                  FactoryFinder.getFactory(FactoryFinder.LIFECYCLE_FACTORY);
            for(Iterator iter = factory.getLifecycleIds(); iter.hasNext(); ) {
                Lifecycle lifecycle = factory.getLifecycle((String) iter.next());
                lifecycle.removePhaseListener(this);
            }
            removed = true;
        }
	}

	/* (non-Javadoc)
	 * @see javax.faces.event.PhaseListener#beforePhase(javax.faces.event.PhaseEvent)
	 */
	public synchronized void beforePhase(PhaseEvent event) {
		if(!initialized){
			if(log.isDebugEnabled()){
				log.debug("Perform additional framework initialization on first request");
			}
			FacesContext facesContext = event.getFacesContext();
			Application application = facesContext.getApplication();
			StateManager stateManager = application.getStateManager();
			if(! (stateManager instanceof AjaxStateManager)){
				if(log.isDebugEnabled()){
					log.debug("Set AjaxStateManager on top of chain");
				}
				application.setStateManager(new AjaxStateManager(stateManager));
			}
			ViewHandler viewHandler = application.getViewHandler();
			if (!(viewHandler instanceof AjaxViewHandler)) {
				if(log.isDebugEnabled()){
					log.debug("Set AjaxViewHandler on top of chain");
				}
				application.setViewHandler(new AjaxViewHandler(viewHandler));
			}
			initialized = true;
		}
	}

	/* (non-Javadoc)
	 * @see javax.faces.event.PhaseListener#getPhaseId()
	 */
	public PhaseId getPhaseId() {
		// TODO Auto-generated method stub
		return PhaseId.ANY_PHASE;
	}

}