/*
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* Copyright ${year}, Red Hat, Inc. and individual contributors
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.ajax4jsf.component.behavior;
import javax.el.ELContext;
import javax.el.MethodExpression;
import javax.el.MethodNotFoundException;
import javax.faces.component.StateHolder;
import javax.faces.context.FacesContext;
import javax.faces.event.AbortProcessingException;
import javax.faces.event.AjaxBehaviorEvent;
import javax.faces.event.AjaxBehaviorListener;
/**
* @author Anton Belevich
*
*/
public class MethodExpressionAjaxBehaviorListener implements AjaxBehaviorListener, StateHolder {
private static final Class<?>[] ACTION_LISTENER_ZEROARG_SIG = new Class[] {};
private MethodExpression methodExpressionOneArg = null;
private MethodExpression methodExpressionZeroArg = null;
private boolean isTransient;
public MethodExpressionAjaxBehaviorListener() {
}
public MethodExpressionAjaxBehaviorListener(MethodExpression methodExpressionOneArg) {
this.methodExpressionOneArg = methodExpressionOneArg;
FacesContext context = FacesContext.getCurrentInstance();
ELContext elContext = context.getELContext();
this.methodExpressionZeroArg = context
.getApplication()
.getExpressionFactory()
.createMethodExpression(elContext, methodExpressionOneArg.getExpressionString(), Void.class,
ACTION_LISTENER_ZEROARG_SIG);
}
public MethodExpressionAjaxBehaviorListener(MethodExpression methodExpressionOneArg, MethodExpression methodExpressionZeroArg) {
this.methodExpressionOneArg = methodExpressionOneArg;
this.methodExpressionZeroArg = methodExpressionZeroArg;
}
public void processAjaxBehavior(AjaxBehaviorEvent event) throws AbortProcessingException {
FacesContext context = FacesContext.getCurrentInstance();
ELContext elContext = context.getELContext();
try {
methodExpressionOneArg.invoke(elContext, new Object[] { event });
} catch (MethodNotFoundException mnfe) {
methodExpressionZeroArg.invoke(elContext, new Object[] {});
}
}
public boolean isTransient() {
return isTransient;
}
public void setTransient(boolean newTransientValue) {
isTransient = newTransientValue;
}
public void restoreState(FacesContext context, Object state) {
if (context == null) {
throw new NullPointerException();
}
if (state == null) {
return;
}
methodExpressionOneArg = (MethodExpression) ((Object[]) state)[0];
methodExpressionZeroArg = (MethodExpression) ((Object[]) state)[1];
}
public Object saveState(FacesContext context) {
if (context == null) {
throw new NullPointerException();
}
return new Object[] { methodExpressionOneArg, methodExpressionZeroArg };
}
}