01: /**
02: * ===========================================
03: * JFreeReport : a free Java reporting library
04: * ===========================================
05: *
06: * Project Info: http://reporting.pentaho.org/
07: *
08: * (C) Copyright 2001-2007, by Object Refinery Ltd, 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: * BeginGroupHandler.java
27: * ------------
28: * (C) Copyright 2001-2007, by Object Refinery Ltd, Pentaho Corporation and Contributors.
29: */package org.jfree.report.states.process;
30:
31: import org.jfree.report.ReportProcessingException;
32: import org.jfree.report.RootLevelBand;
33: import org.jfree.report.event.ReportEvent;
34:
35: /**
36: * Creation-Date: 03.07.2007, 13:57:49
37: *
38: * @author Thomas Morgner
39: */
40: public class BeginGroupHandler implements AdvanceHandler {
41: public static final AdvanceHandler HANDLER = new BeginGroupHandler();
42:
43: private BeginGroupHandler() {
44: }
45:
46: public int getEventCode() {
47: return ReportEvent.GROUP_STARTED;
48: }
49:
50: private boolean hasMoreGroups(final ProcessState state) {
51: return state.getCurrentGroupIndex() < (state.getReport()
52: .getGroupCount() - 1);
53: }
54:
55: public ProcessState advance(final ProcessState state)
56: throws ReportProcessingException {
57: final ProcessState next = state.deriveForAdvance();
58: next.firePrepareEvent();
59: next.setCurrentGroupIndex(next.getCurrentGroupIndex() + 1);
60: next.fireReportEvent();
61: return next;
62: }
63:
64: public ProcessState commit(final ProcessState next)
65: throws ReportProcessingException {
66: if (hasMoreGroups(next) == false) {
67: next.setAdvanceHandler(BeginDetailsHandler.HANDLER);
68: }
69:
70: final RootLevelBand rootLevelBand = next.getReport().getGroup(
71: next.getCurrentGroupIndex()).getHeader();
72: if (rootLevelBand.getSubReportCount() == 0) {
73: return next;
74: }
75: return new ProcessState(rootLevelBand.getSubReports(), 0, next);
76: }
77:
78: public boolean isFinish() {
79: return false;
80: }
81: }
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