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 * AbstractXYZDataset.java
029 * -----------------------
030 * (C) Copyright 2004-2008, by Object Refinery Limited.
031 *
032 * Original Author: David Gilbert (for Object Refinery Limited).
033 * Contributor(s): -;
034 *
035 * Changes
036 * -------
037 * 05-May-2004 : Version 1 (DG);
038 * 15-Jul-2004 : Switched getZ() and getZValue() (DG);
039 *
040 */
041
042 package org.jfree.data.xy;
043
044 /**
045 * An base class that you can use to create new implementations of the
046 * {@link XYZDataset} interface.
047 */
048 public abstract class AbstractXYZDataset extends AbstractXYDataset
049 implements XYZDataset {
050
051 /**
052 * Returns the z-value (as a double primitive) for an item within a series.
053 *
054 * @param series the series (zero-based index).
055 * @param item the item (zero-based index).
056 *
057 * @return The z-value.
058 */
059 public double getZValue(int series, int item) {
060 double result = Double.NaN;
061 Number z = getZ(series, item);
062 if (z != null) {
063 result = z.doubleValue();
064 }
065 return result;
066 }
067
068 }