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 }