001    /* ===========================================================
002     * JFreeChart : a free chart library for the Java(tm) platform
003     * ===========================================================
004     *
005     * (C) Copyright 2000-2006, 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     * Values.java
029     * -----------
030     * (C) Copyright 2001-2006, by Object Refinery Limited.
031     *
032     * Original Author:  David Gilbert (for Object Refinery Limited);
033     * Contributor(s):   -;
034     *
035     * $Id: Values.java,v 1.2.2.2 2006/07/26 12:15:52 mungady Exp $
036     *
037     * Changes:
038     * --------
039     * 08-Nov-2001 : Version 1 (DG);
040     * 23-Oct-2002 : Renamed getValueCount --> getItemCount (DG);#
041     * ------------- JFREECHART 1.0.0 ---------------------------------------------
042     * 02-May-2006 : Updated API docs (DG);
043     *
044     */
045    
046    package org.jfree.data;
047    
048    /**
049     * An interface through which (single-dimension) data values can be accessed.
050     */
051    public interface Values {
052    
053        /**
054         * Returns the number of items (values) in the collection.
055         *
056         * @return The item count (possibly zero).
057         */
058        public int getItemCount();
059    
060        /**
061         * Returns the value with the specified index.
062         *
063         * @param index  the item index (in the range <code>0</code> to 
064         *     <code>getItemCount() - 1</code>).
065         *
066         * @return The value (possibly <code>null</code>).
067         * 
068         * @throws IndexOutOfBoundsException if <code>index</code> is not in the 
069         *     specified range.
070         */
071        public Number getValue(int index);
072    
073    }