001 /* ===========================================================
002 * JFreeChart : a free chart library for the Java(tm) platform
003 * ===========================================================
004 *
005 * (C) Copyright 2000-2007, 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 2004-2007, 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 getStartX() and getStartXValue() methods and
039 * others (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
047 /**
048 * An base class that you can use to create new implementations of the
049 * {@link IntervalXYDataset} interface.
050 */
051 public abstract class AbstractIntervalXYDataset extends AbstractXYDataset
052 implements IntervalXYDataset {
053
054 /**
055 * Returns the start x-value (as a double primitive) for an item within a
056 * series.
057 *
058 * @param series the series index (zero-based).
059 * @param item the item index (zero-based).
060 *
061 * @return The value.
062 */
063 public double getStartXValue(int series, int item) {
064 double result = Double.NaN;
065 Number x = getStartX(series, item);
066 if (x != null) {
067 result = x.doubleValue();
068 }
069 return result;
070 }
071
072 /**
073 * Returns the end x-value (as a double primitive) for an item within a
074 * series.
075 *
076 * @param series the series index (zero-based).
077 * @param item the item index (zero-based).
078 *
079 * @return The value.
080 */
081 public double getEndXValue(int series, int item) {
082 double result = Double.NaN;
083 Number x = getEndX(series, item);
084 if (x != null) {
085 result = x.doubleValue();
086 }
087 return result;
088 }
089
090 /**
091 * Returns the start y-value (as a double primitive) for an item within a
092 * series.
093 *
094 * @param series the series index (zero-based).
095 * @param item the item index (zero-based).
096 *
097 * @return The value.
098 */
099 public double getStartYValue(int series, int item) {
100 double result = Double.NaN;
101 Number y = getStartY(series, item);
102 if (y != null) {
103 result = y.doubleValue();
104 }
105 return result;
106 }
107
108 /**
109 * Returns the end y-value (as a double primitive) for an item within a
110 * series.
111 *
112 * @param series the series (zero-based index).
113 * @param item the item (zero-based index).
114 *
115 * @return The value.
116 */
117 public double getEndYValue(int series, int item) {
118 double result = Double.NaN;
119 Number y = getEndY(series, item);
120 if (y != null) {
121 result = y.doubleValue();
122 }
123 return result;
124 }
125
126 }