001 /* ===========================================================
002 * JFreeChart : a free chart library for the Java(tm) platform
003 * ===========================================================
004 *
005 * (C) Copyright 2000-2008, 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 2001-2008, by Object Refinery Limited.
031 *
032 * Original Author: David Gilbert (for Object Refinery Limited);
033 * Contributor(s): -;
034 *
035 * Changes:
036 * --------
037 * 08-Nov-2001 : Version 1 (DG);
038 * 23-Oct-2002 : Renamed getValueCount --> getItemCount (DG);#
039 * ------------- JFREECHART 1.0.x ---------------------------------------------
040 * 02-May-2006 : Updated API docs (DG);
041 *
042 */
043
044 package org.jfree.data;
045
046 /**
047 * An interface through which (single-dimension) data values can be accessed.
048 */
049 public interface Values {
050
051 /**
052 * Returns the number of items (values) in the collection.
053 *
054 * @return The item count (possibly zero).
055 */
056 public int getItemCount();
057
058 /**
059 * Returns the value with the specified index.
060 *
061 * @param index the item index (in the range <code>0</code> to
062 * <code>getItemCount() - 1</code>).
063 *
064 * @return The value (possibly <code>null</code>).
065 *
066 * @throws IndexOutOfBoundsException if <code>index</code> is not in the
067 * specified range.
068 */
069 public Number getValue(int index);
070
071 }