01: /*
02: * ============================================================================
03: * GNU Lesser General Public License
04: * ============================================================================
05: *
06: * JasperReports - Free Java report-generating library.
07: * Copyright (C) 2001-2006 JasperSoft Corporation http://www.jaspersoft.com
08: *
09: * 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: * A simple data source implementation that simulates a data source with a given number of virtual records inside.
32: * It is called empty data source because even though it has one or more records inside, all the report fields
33: * are null for all the virtual records of the data source.
34: * @author Teodor Danciu (teodord@users.sourceforge.net)
35: * @version $Id: JREmptyDataSource.java 1229 2006-04-19 10:27:35Z teodord $
36: */
37: public class JREmptyDataSource implements JRRewindableDataSource {
38:
39: /**
40: *
41: */
42: private int count = 1;
43: private int index = 0;
44:
45: /**
46: *
47: */
48: public JREmptyDataSource() {
49: }
50:
51: /**
52: *
53: */
54: public JREmptyDataSource(int count) {
55: this .count = count;
56: }
57:
58: /**
59: *
60: */
61: public boolean next() {
62: return (index++ < count);
63: }
64:
65: /**
66: *
67: */
68: public Object getFieldValue(JRField field) {
69: return null;
70: }
71:
72: /**
73: *
74: */
75: public void moveFirst() {
76: this .index = 0;
77: }
78:
79: }
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