001 /**
002 * ========================================
003 * JFreeReport : a free Java report library
004 * ========================================
005 *
006 * Project Info: http://reporting.pentaho.org/
007 *
008 * (C) Copyright 2000-2007, by Object Refinery Limited, Pentaho Corporation and Contributors.
009 *
010 * This library is free software; you can redistribute it and/or modify it under the terms
011 * of the GNU Lesser General Public License as published by the Free Software Foundation;
012 * either version 2.1 of the License, or (at your option) any later version.
013 *
014 * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
015 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
016 * See the GNU Lesser General Public License for more details.
017 *
018 * You should have received a copy of the GNU Lesser General Public License along with this
019 * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
020 * Boston, MA 02111-1307, USA.
021 *
022 * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
023 * in the United States and other countries.]
024 *
025 * ------------
026 * $Id: InstanceID.java,v 1.7 2007/04/01 18:49:33 taqua Exp $
027 * ------------
028 * (C) Copyright 2000-2005, by Object Refinery Limited.
029 * (C) Copyright 2005-2007, by Pentaho Corporation.
030 */
031
032 package org.jfree.report.util;
033
034 import java.io.Serializable;
035
036 /**
037 * This class can be used as ID to mark instances of objects. This allows to track and
038 * identify objects and their clones.
039 *
040 * @author Thomas Morgner
041 */
042 public final class InstanceID implements Serializable
043 {
044 /**
045 * DefaultConstructor.
046 */
047 public InstanceID ()
048 {
049 }
050
051 /**
052 * Returns a simple string representation of this object to make is identifiable by
053 * human users.
054 *
055 * @return the string representation.
056 */
057 public String toString ()
058 {
059 return "InstanceID[" + hashCode() + "]";
060 }
061 }