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/*
* Copyright (c) 1998-2002 Xerox Corporation. All rights reserved.
*
* Use and copying of this software and preparation of derivative works based
* upon this software are permitted. Any distribution of this software or
* derivative works must comply with all applicable United States export
* control laws.
*
* This software is made available AS IS, and Xerox Corporation makes no
* warranty about the software, its performance or its conformity to any
* specification.
*/
package bean;
import java.beans.*;
import java.io.Serializable;
/*
* Add bound properties and serialization to point objects
*/
aspect BoundPoint {
/*
* privately introduce a field into Point to hold the property
* change support object. `this' is a reference to a Point object.
*/
private PropertyChangeSupport Point.support = new PropertyChangeSupport(this);
/*
* Introduce the property change registration methods into Point.
* also introduce implementation of the Serializable interface.
*/
public void Point.addPropertyChangeListener(PropertyChangeListener listener){
support.addPropertyChangeListener(listener);
}
public void Point.addPropertyChangeListener(String propertyName,
PropertyChangeListener listener){
support.addPropertyChangeListener(propertyName, listener);
}
public void Point.removePropertyChangeListener(String propertyName,
PropertyChangeListener listener) {
support.removePropertyChangeListener(propertyName, listener);
}
public void Point.removePropertyChangeListener(PropertyChangeListener listener) {
support.removePropertyChangeListener(listener);
}
public void Point.hasListeners(String propertyName) {
support.hasListeners(propertyName);
}
declare parents: Point implements Serializable;
/**
* Pointcut describing the set<property> methods on Point.
* (uses a wildcard in the method name)
*/
pointcut setter(Point p): call(void Point.set*(*)) && target(p);
/**
* Advice to get the property change event fired when the
* setters are called. It's around advice because you need
* the old value of the property.
*/
void around(Point p): setter(p) {
String propertyName =
thisJoinPointStaticPart.getSignature().getName().substring("set".length());
int oldX = p.getX();
int oldY = p.getY();
proceed(p);
if (propertyName.equals("X")){
firePropertyChange(p, propertyName, oldX, p.getX());
} else {
firePropertyChange(p, propertyName, oldY, p.getY());
}
}
/*
* Utility to fire the property change event.
*/
void firePropertyChange(Point p,
String property,
double oldval,
double newval) {
p.support.firePropertyChange(property,
new Double(oldval),
new Double(newval));
}
}
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