001/* ======================================================
002 * JFreeChart : a chart library for the Java(tm) platform
003 * ======================================================
004 *
005 * (C) Copyright 2000-present, by David Gilbert and Contributors.
006 *
007 * Project Info:  https://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 * [Oracle and Java are registered trademarks of Oracle and/or its affiliates. 
025 * Other names may be trademarks of their respective owners.]
026 *
027 * -----------------------
028 * AbstractXYZDataset.java
029 * -----------------------
030 * (C) Copyright 2004-present, by David Gilbert.
031 *
032 * Original Author:  David Gilbert.
033 * Contributor(s):   -;
034 *
035 */
036
037package org.jfree.data.xy;
038
039/**
040 * An base class that you can use to create new implementations of the
041 * {@link XYZDataset} interface.
042 */
043public abstract class AbstractXYZDataset extends AbstractXYDataset
044        implements XYZDataset {
045
046    /**
047     * Creates a new empty dataset.
048     */
049    protected AbstractXYZDataset() {
050        super();
051    }
052
053    /**
054     * Returns the z-value (as a double primitive) for an item within a series.
055     *
056     * @param series  the series (zero-based index).
057     * @param item  the item (zero-based index).
058     *
059     * @return The z-value.
060     */
061    @Override
062    public double getZValue(int series, int item) {
063        double result = Double.NaN;
064        Number z = getZ(series, item);
065        if (z != null) {
066            result = z.doubleValue();
067        }
068        return result;
069    }
070
071}