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 * AbstractIntervalXYDataset.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: AbstractIntervalXYDataset.java,v 1.3.2.1 2005/10/25 21:36:51 mungady Exp $ 036 * 037 * Changes 038 * ------- 039 * 05-May-2004 : Version 1 (DG); 040 * 15-Jul-2004 : Switched getStartX() and getStartXValue() methods and 041 * others (DG); 042 * 18-Aug-2004 : Moved from org.jfree.data --> org.jfree.data.xy (DG); 043 * 044 */ 045 046 package org.jfree.data.xy; 047 048 049 /** 050 * An base class that you can use to create new implementations of the 051 * {@link IntervalXYDataset} interface. 052 */ 053 public abstract class AbstractIntervalXYDataset extends AbstractXYDataset 054 implements IntervalXYDataset { 055 056 /** 057 * Returns the start x-value (as a double primitive) for an item within a 058 * series. 059 * 060 * @param series the series index (zero-based). 061 * @param item the item index (zero-based). 062 * 063 * @return The value. 064 */ 065 public double getStartXValue(int series, int item) { 066 double result = Double.NaN; 067 Number x = getStartX(series, item); 068 if (x != null) { 069 result = x.doubleValue(); 070 } 071 return result; 072 } 073 074 /** 075 * Returns the end x-value (as a double primitive) for an item within a 076 * series. 077 * 078 * @param series the series index (zero-based). 079 * @param item the item index (zero-based). 080 * 081 * @return The value. 082 */ 083 public double getEndXValue(int series, int item) { 084 double result = Double.NaN; 085 Number x = getEndX(series, item); 086 if (x != null) { 087 result = x.doubleValue(); 088 } 089 return result; 090 } 091 092 /** 093 * Returns the start y-value (as a double primitive) for an item within a 094 * series. 095 * 096 * @param series the series index (zero-based). 097 * @param item the item index (zero-based). 098 * 099 * @return The value. 100 */ 101 public double getStartYValue(int series, int item) { 102 double result = Double.NaN; 103 Number y = getStartY(series, item); 104 if (y != null) { 105 result = y.doubleValue(); 106 } 107 return result; 108 } 109 110 /** 111 * Returns the end y-value (as a double primitive) for an item within a 112 * series. 113 * 114 * @param series the series (zero-based index). 115 * @param item the item (zero-based index). 116 * 117 * @return The value. 118 */ 119 public double getEndYValue(int series, int item) { 120 double result = Double.NaN; 121 Number y = getEndY(series, item); 122 if (y != null) { 123 result = y.doubleValue(); 124 } 125 return result; 126 } 127 128 }