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Java > Open Source Codes > net > sf > jasperreports > engine > JREmptyDataSource


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.engine;
29
30
31 /**
32  * A simple data source implementation that simulates a data source with a given number of virtual records inside.
33  * It is called empty data source because even though it has one or more records inside, all the report fields
34  * are null for all the virtual records of the data source.
35  * @author Teodor Danciu (teodord@users.sourceforge.net)
36  * @version $Id: JREmptyDataSource.java 1229 2006-04-19 13:27:35 +0300 (Wed, 19 Apr 2006) teodord $
37  */
38 public class JREmptyDataSource implements JRRewindableDataSource
39 {
40
41
42     /**
43      *
44      */
45     private int count = 1;
46     private int index = 0;
47
48
49     /**
50      *
51      */
52     public JREmptyDataSource()
53     {
54     }
55
56
57     /**
58      *
59      */
60     public JREmptyDataSource(int count)
61     {
62         this.count = count;
63     }
64
65
66     /**
67      *
68      */
69     public boolean next()
70     {
71         return (index++ < count);
72     }
73
74
75     /**
76      *
77      */
78     public Object JavaDoc getFieldValue(JRField field)
79     {
80         return null;
81     }
82
83
84     /**
85      *
86      */
87     public void moveFirst()
88     {
89         this.index = 0;
90     }
91
92
93 }
94
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