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: IsEndOfDataExpression.java 3525 2007-10-16 11:43:48Z tmorgner $
27: * ------------
28: * (C) Copyright 2000-2005, by Object Refinery Limited.
29: * (C) Copyright 2005-2007, by Pentaho Corporation.
30: */package org.jfree.report.expressions.sys;
31:
32: import org.jfree.report.DataSourceException;
33: import org.jfree.report.ReportData;
34: import org.jfree.report.expressions.AbstractExpression;
35:
36: /**
37: * Creation-Date: 19.02.2006, 19:15:45
38: *
39: * @author Thomas Morgner
40: */
41: public class IsEndOfDataExpression extends AbstractExpression {
42: public IsEndOfDataExpression() {
43: }
44:
45: /**
46: * Return the current expression value. <P> The value depends (obviously) on
47: * the expression implementation.
48: *
49: * @return the value of the function.
50: */
51: public Object computeValue() throws DataSourceException {
52: final ReportData data = getRuntime().getData();
53: synchronized (data) {
54: if (data.isAdvanceable()) {
55: return Boolean.TRUE;
56: }
57: return Boolean.FALSE;
58: }
59: }
60: }
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