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/*******************************************************************************
* Copyright (c) 2007, 2010 Oracle. All rights reserved.
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0, which accompanies this distribution
* and is available at http://www.eclipse.org/legal/epl-v10.html.
*
* Contributors:
* Oracle - initial API and implementation
******************************************************************************/
package org.eclipse.jpt.common.utility.model.listener;
import java.lang.reflect.Method;
import org.eclipse.jpt.common.utility.internal.ReflectionTools;
import org.eclipse.jpt.common.utility.model.event.PropertyChangeEvent;
import org.eclipse.jpt.common.utility.model.event.StateChangeEvent;
/**
* This class is used by {@link ReflectiveChangeListener} when the requested listener
* need only implement a single method (i.e. {@link StateChangeListener} or
* {@link PropertyChangeListener}).
*/
class SingleMethodReflectiveChangeListener
extends ReflectiveChangeListener
implements StateChangeListener, PropertyChangeListener
{
/** the method we will invoke on the target object */
private final Method method;
/** cache the number of arguments */
private final boolean methodIsZeroArgument;
SingleMethodReflectiveChangeListener(Object target, Method method) {
super(target);
this.method = method;
this.methodIsZeroArgument = method.getParameterTypes().length == 0;
}
// ********** StateChangeListener implementation **********
public void stateChanged(StateChangeEvent event) {
if (this.methodIsZeroArgument) {
ReflectionTools.executeMethod(this.method, this.target, EMPTY_OBJECT_ARRAY);
} else {
ReflectionTools.executeMethod(this.method, this.target, new StateChangeEvent[] {event});
}
}
// ********** PropertyChangeListener implementation **********
public void propertyChanged(PropertyChangeEvent event) {
if (this.methodIsZeroArgument) {
ReflectionTools.executeMethod(this.method, this.target, EMPTY_OBJECT_ARRAY);
} else {
ReflectionTools.executeMethod(this.method, this.target, new PropertyChangeEvent[] {event});
}
}
}
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