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     * Value.java
029     * ----------
030     * (C) Copyright 2002-2004, by Object Refinery Limited.
031     *
032     * Original Author:  David Gilbert (for Object Refinery Limited);
033     * Contributor(s):   -;
034     *
035     * $Id: Value.java,v 1.2.2.1 2005/10/25 21:29:13 mungady Exp $
036     *
037     * Changes:
038     * --------
039     * 28-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 general purpose interface for accessing a value.
048     */
049    public interface Value {
050    
051        /**
052         * Returns the value.
053         *
054         * @return The value (possibly <code>null</code>).
055         */
056        public Number getValue();
057    
058    }