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Java > Open Source Codes > net > sf > jasperreports > charts > fill > JRFillValueDataset


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.fill;
29
30 import net.sf.jasperreports.charts.JRValueDataset;
31 import net.sf.jasperreports.engine.JRChartDataset;
32 import net.sf.jasperreports.engine.JRExpression;
33 import net.sf.jasperreports.engine.JRExpressionCollector;
34 import net.sf.jasperreports.engine.design.JRVerifier;
35 import net.sf.jasperreports.engine.fill.JRCalculator;
36 import net.sf.jasperreports.engine.fill.JRExpressionEvalException;
37 import net.sf.jasperreports.engine.fill.JRFillChartDataset;
38 import net.sf.jasperreports.engine.fill.JRFillObjectFactory;
39
40 import org.jfree.data.general.Dataset;
41 import org.jfree.data.general.DefaultValueDataset;
42
43 /**
44  * @author Barry Klawans (bklawans@users.sourceforge.net)
45  * @version $Id: JRFillValueDataset.java 1386 2006-09-06 00:33:02 +0300 (Wed, 06 Sep 2006) bklawans $
46  */
47 public class JRFillValueDataset extends JRFillChartDataset implements JRValueDataset
48 {
49
50     private Number JavaDoc value = null;
51
52     /**
53      *
54      */
55     private DefaultValueDataset valueDataset = new DefaultValueDataset();
56
57     
58     /**
59      *
60      */
61     public JRFillValueDataset(JRValueDataset valueDataset,
62                               JRFillObjectFactory factory)
63     {
64         super(valueDataset, factory);
65     }
66     
67     /**
68      *
69      */
70     public JRExpression getValueExpression()
71     {
72         return ((JRValueDataset)parent).getValueExpression();
73     }
74    
75     
76     /**
77      *
78      */
79     protected void customInitialize()
80     {
81         valueDataset = new DefaultValueDataset();
82     }
83
84     /**
85      *
86      */
87     protected void customEvaluate(JRCalculator calculator) throws JRExpressionEvalException
88     {
89         value = (Number JavaDoc)calculator.evaluate(getValueExpression());
90     }
91
92     /**
93      *
94      */
95     protected void customIncrement()
96     {
97         valueDataset.setValue(value);
98     }
99
100     /**
101      *
102      */
103     public Dataset getCustomDataset()
104     {
105         return valueDataset;
106     }
107
108     /**
109      *
110      */
111     public byte getDatasetType() {
112         return JRChartDataset.VALUE_DATASET;
113     }
114         
115     /**
116      *
117      */
118     public void collectExpressions(JRExpressionCollector collector)
119     {
120         collector.collect(this);
121     }
122
123     public void validate(JRVerifier verifier)
124     {
125         verifier.verify(this);
126     }
127
128 }
129
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