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 2725 2007-04-01 18:49:29Z taqua $
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    }