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/*

* Copyright (c) 1996, 2003, Oracle and/or its affiliates. All rights reserved.

* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.

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package java.util;

/**

* <p>

* The root class from which all event state objects shall be derived.

* <p>

* All Events are constructed with a reference to the object, the "source",

* that is logically deemed to be the object upon which the Event in question

* initially occurred upon.

*

* @since JDK1.1

*/

public class EventObject implements java.io.Serializable {

private static final long serialVersionUID = 5516075349620653480L;

/**

* The object on which the Event initially occurred.

*/

protected transient Object source;

/**

* Constructs a prototypical Event.

*

* @param source The object on which the Event initially occurred.

* @exception IllegalArgumentException if source is null.

*/

public EventObject(Object source) {

if (source == null)

throw new IllegalArgumentException("null source");

this.source = source;

}

/**

* The object on which the Event initially occurred.

*

* @return The object on which the Event initially occurred.

*/

public Object getSource() {

return source;

}

/**

* Returns a String representation of this EventObject.

*

* @return A a String representation of this EventObject.

*/

public String toString() {

return getClass().getName() + "[source=" + source + "]";

}

}