001 /* =========================================================== 002 * JFreeChart : a free chart library for the Java(tm) platform 003 * =========================================================== 004 * 005 * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors. 006 * 007 * Project Info: http://www.jfree.org/jfreechart/index.html 008 * 009 * This library is free software; you can redistribute it and/or modify it 010 * under the terms of the GNU Lesser General Public License as published by 011 * the Free Software Foundation; either version 2.1 of the License, or 012 * (at your option) any later version. 013 * 014 * This library is distributed in the hope that it will be useful, but 015 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 016 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 017 * License for more details. 018 * 019 * You should have received a copy of the GNU Lesser General Public 020 * License along with this library; if not, write to the Free Software 021 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 022 * USA. 023 * 024 * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 025 * in the United States and other countries.] 026 * 027 * ----------------- 028 * DatasetGroup.java 029 * ----------------- 030 * (C) Copyright 2002-2005, by Object Refinery Limited. 031 * 032 * Original Author: David Gilbert (for Object Refinery Limited); 033 * Contributor(s): -; 034 * 035 * $Id: DatasetGroup.java,v 1.4.2.1 2005/10/25 21:32:29 mungady Exp $ 036 * 037 * Changes 038 * ------- 039 * 07-Oct-2002 : Version 1 (DG); 040 * 26-Mar-2003 : Implemented Serializable (DG); 041 * 20-Aug-2003 : Implemented Cloneable (DG); 042 * 043 */ 044 045 package org.jfree.data.general; 046 047 import java.io.Serializable; 048 049 /** 050 * A class that is used to group datasets (currently not used for any specific 051 * purpose). 052 */ 053 public class DatasetGroup implements Cloneable, Serializable { 054 055 /** For serialization. */ 056 private static final long serialVersionUID = -3640642179674185688L; 057 058 /** The group id. */ 059 private String id; 060 061 /** 062 * Constructs a new group. 063 */ 064 public DatasetGroup() { 065 super(); 066 this.id = "NOID"; 067 } 068 069 /** 070 * Creates a new group with the specified id. 071 * 072 * @param id the identification for the group. 073 */ 074 public DatasetGroup(String id) { 075 if (id == null) { 076 throw new IllegalArgumentException("Null 'id' argument."); 077 } 078 this.id = id; 079 } 080 081 /** 082 * Returns the identification string for this group. 083 * 084 * @return The identification string. 085 */ 086 public String getID() { 087 return this.id; 088 } 089 090 /** 091 * Clones the group. 092 * 093 * @return A clone. 094 * 095 * @throws CloneNotSupportedException not by this class. 096 */ 097 public Object clone() throws CloneNotSupportedException { 098 return super.clone(); 099 } 100 101 /** 102 * Tests this instance for equality with an arbitrary object. 103 * 104 * @param obj the object (<code>null</code> permitted). 105 * 106 * @return A boolean. 107 */ 108 public boolean equals(Object obj) { 109 if (obj == this) { 110 return true; 111 } 112 if (!(obj instanceof DatasetGroup)) { 113 return false; 114 } 115 DatasetGroup that = (DatasetGroup) obj; 116 if (!this.id.equals(that.id)) { 117 return false; 118 } 119 return true; 120 } 121 122 }