/*
* Copyright 2010 Red Hat, Inc. and/or its affiliates.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* 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.drools.eclipse.editors.rete.model;
import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeSupport;
/**
* Abstract prototype of a model element.
*/
public abstract class ModelElement {
/** Delegate used to implemenent property-change-support. */
private transient PropertyChangeSupport pcsDelegate = new PropertyChangeSupport( this );
/**
* Attach a non-null PropertyChangeListener to this object.
*
* @param l a non-null PropertyChangeListener instance
* @throws IllegalArgumentException if the parameter is null
*/
public synchronized void addPropertyChangeListener(PropertyChangeListener l) {
if ( l == null ) {
throw new IllegalArgumentException();
}
pcsDelegate.addPropertyChangeListener( l );
}
/**
* Report a property change to registered listeners (for example edit parts).
*
* @param property the programmatic name of the property that changed
* @param oldValue the old value of this property
* @param newValue the new value of this property
*/
protected void firePropertyChange(String property,
Object oldValue,
Object newValue) {
if ( pcsDelegate.hasListeners( property ) ) {
pcsDelegate.firePropertyChange( property,
oldValue,
newValue );
}
}
/**
* Remove a PropertyChangeListener from this component.
*
* @param l a PropertyChangeListener instance
*/
public synchronized void removePropertyChangeListener(PropertyChangeListener l) {
if ( l != null ) {
pcsDelegate.removePropertyChangeListener( l );
}
}
}