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Java > Open Source Codes > net > sf > jasperreports > crosstabs > fill > JRCrosstabExpressionEvaluator


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.crosstabs.fill;
29
30 import java.util.Map JavaDoc;
31
32 import net.sf.jasperreports.engine.JRException;
33 import net.sf.jasperreports.engine.JRExpression;
34 import net.sf.jasperreports.engine.fill.JREvaluator;
35 import net.sf.jasperreports.engine.fill.JRFillExpressionEvaluator;
36
37 /**
38  * Expression evaluator used for crosstabs at fill time.
39  *
40  * @author Lucian Chirita (lucianc@users.sourceforge.net)
41  * @version $Id: JRCrosstabExpressionEvaluator.java 1470 2006-11-08 18:07:35 +0200 (Wed, 08 Nov 2006) teodord $
42  */
43 public class JRCrosstabExpressionEvaluator implements JRFillExpressionEvaluator
44 {
45     private final JREvaluator evaluator;
46     
47     public JRCrosstabExpressionEvaluator(JREvaluator evaluator)
48     {
49         this.evaluator = evaluator;
50     }
51     
52     
53     public Object JavaDoc evaluate(JRExpression expression, byte evaluationType) throws JRException
54     {
55         if (evaluationType != JRExpression.EVALUATION_DEFAULT)
56         {
57             throw new JRException("The crosstab evaluator doesn't support old or estimated expression evaluation.");
58         }
59         
60         return evaluator.evaluate(expression);
61     }
62
63     
64     public void init(Map JavaDoc parametersMap, Map JavaDoc variablesMap, byte whenResourceMissingType) throws JRException
65     {
66         evaluator.init(parametersMap, null, variablesMap, whenResourceMissingType);
67     }
68 }
69
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