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Java > Open Source Codes > net > sf > jasperreports > charts > JRValueDataset


1 /*
2  * ============================================================================
3  * GNU Lesser General Public License
4  * ============================================================================
5  *
6  * JasperReports - Free Java report-generating library.
7  * Copyright (C) 2001-2006 JasperSoft Corporation http://www.jaspersoft.com
8  *
9  * This library is free software; you can redistribute it and/or
10  * modify it under the terms of the GNU Lesser General Public
11  * License as published by the Free Software Foundation; either
12  * version 2.1 of the License, or (at your option) any later version.
13  *
14  * This library is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17  * Lesser General Public 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
22  *
23  * JasperSoft Corporation
24  * 303 Second Street, Suite 450 North
25  * San Francisco, CA 94107
26  * http://www.jaspersoft.com
27  */
28 package net.sf.jasperreports.charts;
29
30 import net.sf.jasperreports.engine.JRChartDataset;
31 import net.sf.jasperreports.engine.JRExpression;
32
33
34 /**
35  * This class represents a dataset that consists of a single
36  * value. It is used by Meter and Thermometer charts, which
37  * plot a single value against a range.
38  *
39  * @author Barry Klawans (bklawans@users.sourceforge.net)
40  * @version $Id: JRValueDataset.java 1385 2006-09-06 00:29:03 +0300 (Wed, 06 Sep 2006) bklawans $
41  */
42 public interface JRValueDataset extends JRChartDataset
43 {
44     
45     /**
46      * Returns the expression that indicates the value held
47      * by this dataset.
48      *
49      * @return the expression that indicates the value held by
50      * this dataset
51      */
52     public JRExpression getValueExpression();
53
54 }
55
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