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.data;
29:
30: import org.hibernate.ScrollableResults;
31:
32: import net.sf.jasperreports.engine.JRException;
33: import net.sf.jasperreports.engine.JRRewindableDataSource;
34: import net.sf.jasperreports.engine.query.JRHibernateQueryExecuter;
35:
36: /**
37: * Hibernate data source that uses <code>org.hibernate.Query.scroll()</code>.
38: *
39: * @author Lucian Chirita (lucianc@users.sourceforge.net)
40: * @version $Id: JRHibernateScrollDataSource.java 1229 2006-04-19 10:27:35Z teodord $
41: */
42: public class JRHibernateScrollDataSource extends
43: JRHibernateAbstractDataSource implements JRRewindableDataSource {
44: private ScrollableResults scrollableResults;
45:
46: public JRHibernateScrollDataSource(
47: JRHibernateQueryExecuter queryExecuter,
48: boolean useFieldDescription) {
49: super (queryExecuter, useFieldDescription, true);
50:
51: scrollableResults = queryExecuter.scroll();
52: }
53:
54: public boolean next() throws JRException {
55: if (scrollableResults != null && scrollableResults.next()) {
56: setCurrentRowValue(scrollableResults.get());
57: return true;
58: }
59:
60: return false;
61: }
62:
63: public void moveFirst() {
64: queryExecuter.closeScrollableResults();
65: scrollableResults = queryExecuter.scroll();
66: }
67: }
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