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jeremybenn |
/* EventObject.java -- represents an event on an object
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Copyright (C) 1999, 2000, 2002, 2005 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.util;
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import java.io.Serializable;
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/**
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* Represents Events fired by Objects.
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*
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* @author Eric Blake (ebb9@email.byu.edu)
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* @see EventListener
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* @since 1.1
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* @status updated to 1.4
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*/
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public class EventObject implements Serializable
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{
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/**
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* Compatible with JDK 1.1+.
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*/
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private static final long serialVersionUID = 5516075349620653480L;
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/**
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* The source object; in other words, the object which this event takes
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* place on.
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*/
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protected transient Object source;
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/**
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* Constructs an EventObject with the specified source.
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*
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* @param source the source of the event
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* @throws IllegalArgumentException if source is null (This is not
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* specified, but matches the behavior of the JDK)
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*/
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public EventObject(Object source)
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{
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// This check for null is stupid, if you ask me, since source is
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// protected and non-final, so a subclass can set it to null later on.
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if (source == null)
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throw new IllegalArgumentException();
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this.source = source;
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}
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/**
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* Returns the source of the event.
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*
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* @return the event source
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*/
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public Object getSource()
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{
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return source;
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}
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/**
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* Converts the event to a String. The format is not specified, but by
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* observation, the JDK uses:
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* <code>getClass().getName() + "[source=" + source + "]";</code>.
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*
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* @return String representation of the Event
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*/
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public String toString()
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{
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return getClass().getName() + "[source=" + source + "]";
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}
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} // class EventObject
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