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Java > Open Source Codes > net > sf > jasperreports > charts > base > JRBaseDataRange


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.base;
29
30 import net.sf.jasperreports.charts.JRDataRange;
31 import net.sf.jasperreports.engine.JRConstants;
32 import net.sf.jasperreports.engine.JRExpression;
33 import net.sf.jasperreports.engine.JRExpressionCollector;
34 import net.sf.jasperreports.engine.base.JRBaseObjectFactory;
35
36 import java.io.Serializable JavaDoc;
37
38 /**
39  * An immutable instantiation of a <code>JRDataRange</code>, suitable for holding
40  * a range.
41  *
42  * @author Barry Klawans (bklawans@users.sourceforge.net)
43  * @version $Id: JRBaseDataRange.java 1386 2006-09-06 00:33:02 +0300 (Wed, 06 Sep 2006) bklawans $
44  */
45 public class JRBaseDataRange implements JRDataRange, Serializable JavaDoc
46 {
47     /**
48      *
49      */
50     private static final long serialVersionUID = JRConstants.SERIAL_VERSION_UID;
51
52     /**
53      * The expression used to calculate the lower bound of the range.
54      */
55     protected JRExpression lowExpression = null;
56     
57     /**
58      * The expression used to calculate the upper bound of the range.
59      */
60     protected JRExpression highExpression = null;
61     
62    
63     /**
64      * Constructs a copy of an existing range.
65      *
66      * @param dataRange the range to copy
67      */
68     public JRBaseDataRange(JRDataRange dataRange)
69     {
70         if (dataRange != null)
71         {
72             this.lowExpression = dataRange.getLowExpression();
73             this.highExpression = dataRange.getHighExpression();
74         }
75 }
76     
77     /**
78      * Creates a copy of an existing range and registers all of the expressions
79      * with a factory object. Once the expressions have been registered they will
80      * be included when the report is compiled.
81      *
82      * @param dataRange the range to copy
83      * @param factory the factory to register the expressions with
84      */
85     public JRBaseDataRange(JRDataRange dataRange, JRBaseObjectFactory factory)
86     {
87         factory.put(dataRange, this);
88
89         lowExpression = factory.getExpression(dataRange.getLowExpression());
90         highExpression = factory.getExpression(dataRange.getHighExpression());
91     }
92         
93         
94     /**
95      *
96      */
97     public JRExpression getLowExpression()
98     {
99         return lowExpression;
100     }
101     /**
102      *
103      */
104     public JRExpression getHighExpression()
105     {
106         return highExpression;
107     }
108
109
110     /**
111      * Registers all of the expressions with the collector. If the expressions
112      * have been registered with one of the report's factory they will be included
113      * when the report is compiled.
114      *
115      * @param collector the expression collector to use
116      */
117     public void collectExpressions(JRExpressionCollector collector)
118     {
119         collector.collect(this);
120     }
121
122 }
123
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