01: /**
02: * ========================================
03: * JFreeReport : a free Java report library
04: * ========================================
05: *
06: * Project Info: http://reporting.pentaho.org/
07: *
08: * (C) Copyright 2000-2007, by Object Refinery Limited, Pentaho Corporation and Contributors.
09: *
10: * This library is free software; you can redistribute it and/or modify it under the terms
11: * of the GNU Lesser General Public License as published by the Free Software Foundation;
12: * either 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, but WITHOUT ANY WARRANTY;
15: * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
16: * See the GNU Lesser General Public License for more details.
17: *
18: * You should have received a copy of the GNU Lesser General Public License along with this
19: * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
20: * Boston, MA 02111-1307, USA.
21: *
22: * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
23: * in the United States and other countries.]
24: *
25: * ------------
26: * $Id: EmptyReportDataFactory.java 3048 2007-07-28 18:02:42Z tmorgner $
27: * ------------
28: * (C) Copyright 2000-2005, by Object Refinery Limited.
29: * (C) Copyright 2005-2007, by Pentaho Corporation.
30: */package org.jfree.report;
31:
32: /**
33: * Creation-Date: 17.11.2006, 16:51:01
34: *
35: * @author Thomas Morgner
36: */
37: public class EmptyReportDataFactory implements ReportDataFactory {
38: public EmptyReportDataFactory() {
39: }
40:
41: public void open() {
42:
43: }
44:
45: /**
46: * Queries a datasource. The string 'query' defines the name of the query. The
47: * Parameterset given here may contain more data than actually needed.
48: * <p/>
49: * The dataset may change between two calls, do not assume anything!
50: *
51: * @param query
52: * @param parameters
53: * @return
54: */
55: public ReportData queryData(final String query,
56: final DataSet parameters) throws ReportDataFactoryException {
57: return new EmptyReportData();
58: }
59:
60: /**
61: * Closes the report data factory and all report data instances that have been
62: * returned by this instance.
63: */
64: public void close() {
65:
66: }
67:
68: /**
69: * Derives a freshly initialized report data factory, which is independend of
70: * the original data factory. Opening or Closing one data factory must not
71: * affect the other factories.
72: *
73: * @return
74: */
75: public ReportDataFactory derive() {
76: return this;
77: }
78: }
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