/* java.beans.PropertyChangeEvent
   Copyright (C) 1998, 2000 Free Software Foundation, Inc.

This file is part of GNU Classpath.

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it under the terms of the GNU General Public License as published by
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any later version.
 
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General Public License for more details.

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02111-1307 USA.

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permission to link this library with independent modules to produce an
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package java.beans;

/**
 ** PropertyChangeEvents are fired in the PropertyChange
 ** and VetoableChange event classes.  They represent the
 ** old and new values as well as the source Bean.<P>
 **
 ** If the old or new value is a primitive type, it must
 ** be wrapped in the appropriate wrapper type
 ** (java.lang.Integer for int, etc., etc.).<P>
 **
 ** If the old or new values are unknown (although why
 ** that would be I do not know), they may be null.<P>
 **
 ** Right now Sun put in a propagationId, reserved for
 ** future use.  Read the comments on the constructor
 ** and on setPropagationId for more information.
 **
 ** @author John Keiser
 ** @since JDK1.1
 ** @version 1.1.0, 29 Jul 1998
 **/

public class PropertyChangeEvent extends java.util.EventObject {
	String propertyName;
	Object oldValue;
	Object newValue;
	Object propagationId;

	private static final long serialVersionUID = 7042693688939648123L;

	/** Create a new PropertyChangeEvent.  Remember that if
	 ** you received a PropertyChangeEvent and are sending
	 ** a new one, you should also set the propagation ID
	 ** from the old PropertyChangeEvent.
	 ** @param source the Bean containing the property.
	 ** @param propertyName the property's name.
	 ** @param oldValue the old value of the property.
	 ** @param newValue the new value of the property.
	 **/
	public PropertyChangeEvent(Object source, String propertyName, Object oldVal, Object newVal) {
		super(source);
		this.propertyName = propertyName;
		oldValue = oldVal;
		newValue = newVal;
	}

	/** Get the property name.
	 ** @return the property name.
	 **/
	public String getPropertyName() {
		return propertyName;
	}

	/** Get the property's old value.
	 ** @return the property's old value.
	 **/
	public Object getOldValue() {
		return oldValue;
	}

	/** Get the property's new value.
	 ** @return the property's new value.
	 **/
	public Object getNewValue() {
		return newValue;
	}

	/** Set the propagation ID.  This is a way for the event
	 ** to be passed from hand to hand and retain a little
	 ** extra state.  Right now it is unused, but it should
	 ** be propagated anyway so that future versions of
	 ** JavaBeans can use it, for God knows what.
	 ** @param propagationId the propagation ID.
	 **/
	public void setPropagationId(Object propagationId) {
		this.propagationId = propagationId;
	}

	/** Get the propagation ID.
	 ** @return the propagation ID.
	 **/
	public Object getPropagationId() {
		return propagationId;
	}
}