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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.io.Serializable;

import javax.faces.component.StateHolder;
import javax.faces.component.UIComponentBase;
import javax.faces.context.FacesContext;
import javax.faces.el.ValueBinding;

/**
 * Helper class to keep reference to listener binded as EL-expression.
 * @author shura
 *
 */
public class AjaxListenerHelper implements AjaxListener,StateHolder {
	
	
	private ValueBinding _binding;
	
	
	private boolean _transient = false;

	
	/**
	 * 
	 */
	public AjaxListenerHelper() {
		super();
		// TODO Auto-generated constructor stub
	}

	/**
	 * @param binding
	 */
	public AjaxListenerHelper(ValueBinding binding) {
		super();
		if (null == binding) {
			throw new IllegalArgumentException("Binding expression for AjaxListener helper must be not null");
		}
		_binding = binding;
	}

	private AjaxListener getHandler(FacesContext context) {
		return (AjaxListener) _binding.getValue(context);
	}

	/* (non-Javadoc)
	 * @see javax.faces.component.StateHolder#restoreState(javax.faces.context.FacesContext, java.lang.Object)
	 */
	public void restoreState(FacesContext context, Object state) {
		State helperState = (State) state;
		_binding = (ValueBinding) UIComponentBase.restoreAttachedState(context,helperState.binding);
	}

	/* (non-Javadoc)
	 * @see javax.faces.component.StateHolder#saveState(javax.faces.context.FacesContext)
	 */
	public Object saveState(FacesContext context) {
		State helperState = new State();
		helperState.binding = UIComponentBase.saveAttachedState(context,_binding);
		return helperState;
	}

	/**
	 * @return Returns the transient.
	 */
	public boolean isTransient() {
		return _transient;
	}

	/**
	 * @param transient1 The transient to set.
	 */
	public void setTransient(boolean transient1) {
		_transient = transient1;
	}
	
	/**
	 * @author shura
	 *
	 */
	private static class State implements Serializable {
		
		
		private Object binding;
		

	}

	public void processAjax(AjaxEvent event) {
		FacesContext context = FacesContext.getCurrentInstance();
		AjaxListener handler = getHandler(context);
		handler.processAjax(event);
	}

}