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 }