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/*******************************************************************************
* Copyright (c) 2000, 2008 IBM Corporation and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.jdt.launching;
import java.util.EventObject;
/**
* An event object describing a change to a named property.
* <p>
* JavaRuntime provides change notification for properties of VM installs
* </p>
* <p>
* Clients may instantiate this class.
* </p>
* @since 2.0
* @noextend This class is not intended to be subclassed by clients.
*/
public class PropertyChangeEvent extends EventObject {
/**
* All serializable objects should have a stable serialVersionUID
*/
private static final long serialVersionUID = 1L;
/**
* The name of the changed property.
*/
private String propertyName;
/**
* The old value of the changed property, or <code>null</code> if
* not known or not relevant.
*/
private Object oldValue;
/**
* The new value of the changed property, or <code>null</code> if
* not known or not relevant.
*/
private Object newValue;
/**
* Creates a new property change event.
*
* @param source the object whose property has changed
* @param property the property that has changed (must not be
* <code>null</code>)
* @param oldValue the old value of the property, or
* <code>null</code> if none
* @param newValue the new value of the property, or
* <code>null</code> if none
*/
public PropertyChangeEvent(
Object source,
String property,
Object oldValue,
Object newValue) {
super(source);
if (property == null) {
throw new IllegalArgumentException();
}
this.propertyName = property;
this.oldValue = oldValue;
this.newValue = newValue;
}
/**
* Returns the name of the property that changed.
*
* @return the name of the property that changed
*/
public String getProperty() {
return propertyName;
}
/**
* Returns the new value of the property.
*
* @return the new value, or <code>null</code> if not known
* or not relevant
*/
public Object getNewValue() {
return newValue;
}
/**
* Returns the old value of the property.
*
* @return the old value, or <code>null</code> if not known
* or not relevant
*/
public Object getOldValue() {
return oldValue;
}
}