001/* ===========================================================
002 * JFreeChart : a free chart library for the Java(tm) platform
003 * ===========================================================
004 *
005 * (C) Copyright 2000-present, by David Gilbert 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 * [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 * AbstractXYDataset.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
039import org.jfree.data.DomainOrder;
040import org.jfree.data.general.AbstractSeriesDataset;
041
042/**
043 * An base class that you can use to create new implementations of the
044 * {@link XYDataset} interface.
045 */
046public abstract class AbstractXYDataset extends AbstractSeriesDataset
047        implements XYDataset {
048
049    /**
050     * Returns the order of the domain (X) values.
051     *
052     * @return The domain order.
053     */
054    @Override
055    public DomainOrder getDomainOrder() {
056        return DomainOrder.NONE;
057    }
058
059    /**
060     * Returns the x-value (as a double primitive) for an item within a series.
061     *
062     * @param series  the series index (zero-based).
063     * @param item  the item index (zero-based).
064     *
065     * @return The value.
066     */
067    @Override
068    public double getXValue(int series, int item) {
069        double result = Double.NaN;
070        Number x = getX(series, item);
071        if (x != null) {
072            result = x.doubleValue();
073        }
074        return result;
075    }
076
077    /**
078     * Returns the y-value (as a double primitive) for an item within a series.
079     *
080     * @param series  the series index (zero-based).
081     * @param item  the item index (zero-based).
082     *
083     * @return The value.
084     */
085    @Override
086    public double getYValue(int series, int item) {
087        double result = Double.NaN;
088        Number y = getY(series, item);
089        if (y != null) {
090            result = y.doubleValue();
091        }
092        return result;
093    }
094
095}