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 * KeyedValue.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: KeyedValue.java,v 1.3.2.1 2005/10/25 21:29:13 mungady Exp $ 036 * 037 * Changes: 038 * -------- 039 * 31-Oct-2002 : Version 1 (DG); 040 * 18-Aug-2004 : Moved from org.jfree.data --> org.jfree.data.base (DG); 041 * 042 */ 043 044 package org.jfree.data; 045 046 /** 047 * A (key, value) pair. 048 * 049 * @see DefaultKeyedValue 050 */ 051 public interface KeyedValue extends Value { 052 053 /** 054 * Returns the key associated with the value. The key returned by this 055 * method should be immutable. 056 * 057 * @return The key. 058 */ 059 public Comparable getKey(); 060 061 }