    001/* ===========================================================
    002 * JFreeChart : a free chart library for the Java(tm) platform
    003 * ===========================================================
    004 *
    005 * (C) Copyright 2000-2011, 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 * [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 2004-2008, 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 getX() with getXValue() and getY() with
    039 *               getYValue() (DG);
    040 * 18-Aug-2004 : Moved from org.jfree.data --> org.jfree.data.xy (DG);
    041 *
    042 */
    043
    044package org.jfree.data.xy;
    045
    046import org.jfree.data.DomainOrder;
    047import org.jfree.data.general.AbstractSeriesDataset;
    048
    049/**
    050 * An base class that you can use to create new implementations of the
    051 * {@link XYDataset} interface.
    052 */
    053public abstract class AbstractXYDataset extends AbstractSeriesDataset
    054        implements XYDataset {
    055
    056    /**
    057     * Returns the order of the domain (X) values.
    058     *
    059     * @return The domain order.
    060     */
    061    public DomainOrder getDomainOrder() {
    062        return DomainOrder.NONE;
    063    }
    064
    065    /**
    066     * Returns the x-value (as a double primitive) for an item within a series.
    067     *
    068     * @param series  the series index (zero-based).
    069     * @param item  the item index (zero-based).
    070     *
    071     * @return The value.
    072     */
    073    public double getXValue(int series, int item) {
    074        double result = Double.NaN;
    075        Number x = getX(series, item);
    076        if (x != null) {
    077            result = x.doubleValue();
    078        }
    079        return result;
    080    }
    081
    082    /**
    083     * Returns the y-value (as a double primitive) for an item within a series.
    084     *
    085     * @param series  the series index (zero-based).
    086     * @param item  the item index (zero-based).
    087     *
    088     * @return The value.
    089     */
    090    public double getYValue(int series, int item) {
    091        double result = Double.NaN;
    092        Number y = getY(series, item);
    093        if (y != null) {
    094            result = y.doubleValue();
    095        }
    096        return result;
    097    }
    098
    099}