001 /* ===========================================================
002 * JFreeChart : a free chart library for the Java(tm) platform
003 * ===========================================================
004 *
005 * (C) Copyright 2000-2008, 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 2004-2008, 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
044 package org.jfree.data.xy;
045
046 import org.jfree.data.DomainOrder;
047 import 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 */
053 public 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 }