001 /* ===========================================================
002 * JFreeChart : a free chart library for the Java(tm) platform
003 * ===========================================================
004 *
005 * (C) Copyright 2000-2005, 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 * AbstractXYDataset.java
029 * ----------------------
030 * (C) Copyright 2004, 2005, by Object Refinery Limited.
031 *
032 * Original Author: David Gilbert (for Object Refinery Limited).
033 * Contributor(s): -;
034 *
035 * $Id: AbstractXYDataset.java,v 1.2.2.1 2005/10/25 21:36:51 mungady Exp $
036 *
037 * Changes
038 * -------
039 * 05-May-2004 : Version 1 (DG);
040 * 15-Jul-2004 : Switched getX() with getXValue() and getY() with
041 * getYValue() (DG);
042 * 18-Aug-2004 : Moved from org.jfree.data --> org.jfree.data.xy (DG);
043 *
044 */
045
046 package org.jfree.data.xy;
047
048 import org.jfree.data.DomainOrder;
049 import org.jfree.data.general.AbstractSeriesDataset;
050
051 /**
052 * An base class that you can use to create new implementations of the
053 * {@link XYDataset} interface.
054 */
055 public abstract class AbstractXYDataset extends AbstractSeriesDataset
056 implements XYDataset {
057
058 /**
059 * Returns the order of the domain (X) values.
060 *
061 * @return The domain order.
062 */
063 public DomainOrder getDomainOrder() {
064 return DomainOrder.NONE;
065 }
066
067 /**
068 * Returns the x-value (as a double primitive) for an item within a series.
069 *
070 * @param series the series index (zero-based).
071 * @param item the item index (zero-based).
072 *
073 * @return The value.
074 */
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 public double getYValue(int series, int item) {
093 double result = Double.NaN;
094 Number y = getY(series, item);
095 if (y != null) {
096 result = y.doubleValue();
097 }
098 return result;
099 }
100
101 }