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 * 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     * Creates a new dataset.
051     */
052    protected AbstractXYDataset() {
053        super();
054    }
055
056    /**
057     * Returns the order of the domain (X) values.
058     *
059     * @return The domain order.
060     */
061    @Override
062    public DomainOrder getDomainOrder() {
063        return DomainOrder.NONE;
064    }
065
066    /**
067     * Returns the x-value (as a double primitive) for an item within a series.
068     *
069     * @param series  the series index (zero-based).
070     * @param item  the item index (zero-based).
071     *
072     * @return The value.
073     */
074    @Override
075    public double getXValue(int series, int item) {
076        double result = Double.NaN;
077        Number x = getX(series, item);
078        if (x != null) {
079            result = x.doubleValue();
080        }
081        return result;
082    }
083
084    /**
085     * Returns the y-value (as a double primitive) for an item within a series.
086     *
087     * @param series  the series index (zero-based).
088     * @param item  the item index (zero-based).
089     *
090     * @return The value.
091     */
092    @Override
093    public double getYValue(int series, int item) {
094        double result = Double.NaN;
095        Number y = getY(series, item);
096        if (y != null) {
097            result = y.doubleValue();
098        }
099        return result;
100    }
101
102}