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Java > Open Source Codes > org > jfree > data > xy > AbstractIntervalXYDataset


1 /* ===========================================================
2  * JFreeChart : a free chart library for the Java(tm) platform
3  * ===========================================================
4  *
5  * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
6  *
7  * Project Info: http://www.jfree.org/jfreechart/index.html
8  *
9  * This library is free software; you can redistribute it and/or modify it
10  * under the terms of the GNU Lesser General Public License as published by
11  * the Free Software Foundation; either version 2.1 of the License, or
12  * (at your option) any later version.
13  *
14  * This library is distributed in the hope that it will be useful, but
15  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
16  * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
17  * License for more details.
18  *
19  * You should have received a copy of the GNU Lesser General Public
20  * License along with this library; if not, write to the Free Software
21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
22  * USA.
23  *
24  * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
25  * in the United States and other countries.]
26  *
27  * ------------------------------
28  * AbstractIntervalXYDataset.java
29  * ------------------------------
30  * (C) Copyright 2004-2005, by Object Refinery Limited.
31  *
32  * Original Author: David Gilbert (for Object Refinery Limited).
33  * Contributor(s): -;
34  *
35  * $Id: AbstractIntervalXYDataset.java,v 1.3.2.1 2005/10/25 21:36:51 mungady Exp $
36  *
37  * Changes
38  * -------
39  * 05-May-2004 : Version 1 (DG);
40  * 15-Jul-2004 : Switched getStartX() and getStartXValue() methods and
41  * others (DG);
42  * 18-Aug-2004 : Moved from org.jfree.data --> org.jfree.data.xy (DG);
43  *
44  */
45
46 package org.jfree.data.xy;
47
48
49 /**
50  * An base class that you can use to create new implementations of the
51  * {@link IntervalXYDataset} interface.
52  */
53 public abstract class AbstractIntervalXYDataset extends AbstractXYDataset
54                                                 implements IntervalXYDataset {
55
56     /**
57      * Returns the start x-value (as a double primitive) for an item within a
58      * series.
59      *
60      * @param series the series index (zero-based).
61      * @param item the item index (zero-based).
62      *
63      * @return The value.
64      */
65     public double getStartXValue(int series, int item) {
66         double result = Double.NaN;
67         Number JavaDoc x = getStartX(series, item);
68         if (x != null) {
69             result = x.doubleValue();
70         }
71         return result;
72     }
73
74     /**
75      * Returns the end x-value (as a double primitive) for an item within a
76      * series.
77      *
78      * @param series the series index (zero-based).
79      * @param item the item index (zero-based).
80      *
81      * @return The value.
82      */
83     public double getEndXValue(int series, int item) {
84         double result = Double.NaN;
85         Number JavaDoc x = getEndX(series, item);
86         if (x != null) {
87             result = x.doubleValue();
88         }
89         return result;
90     }
91
92     /**
93      * Returns the start y-value (as a double primitive) for an item within a
94      * series.
95      *
96      * @param series the series index (zero-based).
97      * @param item the item index (zero-based).
98      *
99      * @return The value.
100      */
101     public double getStartYValue(int series, int item) {
102         double result = Double.NaN;
103         Number JavaDoc 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 JavaDoc y = getEndY(series, item);
122         if (y != null) {
123             result = y.doubleValue();
124         }
125         return result;
126     }
127
128 }
129
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