KickJava   Java API By Example, From Geeks To Geeks.

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


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  * AbstractXYDataset.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: AbstractXYDataset.java,v 1.2.2.1 2005/10/25 21:36:51 mungady Exp $
36  *
37  * Changes
38  * -------
39  * 05-May-2004 : Version 1 (DG);
40  * 15-Jul-2004 : Switched getX() with getXValue() and getY() with
41  * getYValue() (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 import org.jfree.data.DomainOrder;
49 import org.jfree.data.general.AbstractSeriesDataset;
50
51 /**
52  * An base class that you can use to create new implementations of the
53  * {@link XYDataset} interface.
54  */
55 public abstract class AbstractXYDataset extends AbstractSeriesDataset
56                                         implements XYDataset {
57
58     /**
59      * Returns the order of the domain (X) values.
60      *
61      * @return The domain order.
62      */
63     public DomainOrder getDomainOrder() {
64         return DomainOrder.NONE;
65     }
66     
67     /**
68      * Returns the x-value (as a double primitive) for an item within a series.
69      *
70      * @param series the series index (zero-based).
71      * @param item the item index (zero-based).
72      *
73      * @return The value.
74      */
75     public double getXValue(int series, int item) {
76         double result = Double.NaN;
77         Number JavaDoc x = getX(series, item);
78         if (x != null) {
79             result = x.doubleValue();
80         }
81         return result;
82     }
83
84     /**
85      * Returns the y-value (as a double primitive) for an item within a series.
86      *
87      * @param series the series index (zero-based).
88      * @param item the item index (zero-based).
89      *
90      * @return The value.
91      */
92     public double getYValue(int series, int item) {
93         double result = Double.NaN;
94         Number JavaDoc y = getY(series, item);
95         if (y != null) {
96             result = y.doubleValue();
97         }
98         return result;
99     }
100
101 }
102
Popular Tags