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    1   /*
    2    * Copyright (c) 1996, 2003, Oracle and/or its affiliates. All rights reserved.
    3    * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
    4    *
    5    * This code is free software; you can redistribute it and/or modify it
    6    * under the terms of the GNU General Public License version 2 only, as
    7    * published by the Free Software Foundation.  Oracle designates this
    8    * particular file as subject to the "Classpath" exception as provided
    9    * by Oracle in the LICENSE file that accompanied this code.
   10    *
   11    * This code is distributed in the hope that it will be useful, but WITHOUT
   12    * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   13    * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
   14    * version 2 for more details (a copy is included in the LICENSE file that
   15    * accompanied this code).
   16    *
   17    * You should have received a copy of the GNU General Public License version
   18    * 2 along with this work; if not, write to the Free Software Foundation,
   19    * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   20    *
   21    * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
   22    * or visit www.oracle.com if you need additional information or have any
   23    * questions.
   24    */
   25   
   26   package java.util;
   27   
   28   /**
   29    * <p>
   30    * The root class from which all event state objects shall be derived.
   31    * <p>
   32    * All Events are constructed with a reference to the object, the "source",
   33    * that is logically deemed to be the object upon which the Event in question
   34    * initially occurred upon.
   35    *
   36    * @since JDK1.1
   37    */
   38   
   39   public class EventObject implements java.io.Serializable {
   40   
   41       private static final long serialVersionUID = 5516075349620653480L;
   42   
   43       /**
   44        * The object on which the Event initially occurred.
   45        */
   46       protected transient Object  source;
   47   
   48       /**
   49        * Constructs a prototypical Event.
   50        *
   51        * @param    source    The object on which the Event initially occurred.
   52        * @exception  IllegalArgumentException  if source is null.
   53        */
   54       public EventObject(Object source) {
   55           if (source == null)
   56               throw new IllegalArgumentException("null source");
   57   
   58           this.source = source;
   59       }
   60   
   61       /**
   62        * The object on which the Event initially occurred.
   63        *
   64        * @return   The object on which the Event initially occurred.
   65        */
   66       public Object getSource() {
   67           return source;
   68       }
   69   
   70       /**
   71        * Returns a String representation of this EventObject.
   72        *
   73        * @return  A a String representation of this EventObject.
   74        */
   75       public String toString() {
   76           return getClass().getName() + "[source=" + source + "]";
   77       }
   78   }

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