Source Code Cross Referenced for IsEmptyDataExpression.java in  » Report » pentaho-report » org » jfree » report » expressions » sys » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Report » pentaho report » org.jfree.report.expressions.sys 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


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: IsEmptyDataExpression.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.expressions.sys;
31:
32:        import org.jfree.report.DataSourceException;
33:        import org.jfree.report.ReportData;
34:        import org.jfree.report.expressions.AbstractExpression;
35:        import org.jfree.report.expressions.ExpressionRuntime;
36:
37:        /**
38:         * Creation-Date: 31.01.2006, 18:55:09
39:         *
40:         * @author Thomas Morgner
41:         */
42:        public class IsEmptyDataExpression extends AbstractExpression {
43:            public IsEmptyDataExpression() {
44:            }
45:
46:            /**
47:             * Return the current expression value. <P> The value depends (obviously) on
48:             * the expression implementation.
49:             *
50:             * @return the value of the function.
51:             */
52:            public Object computeValue() throws DataSourceException {
53:
54:                final ExpressionRuntime runtime = getRuntime();
55:                if (runtime == null) {
56:                    return null;
57:                }
58:
59:                final ReportData data = runtime.getData();
60:                if (data == null) {
61:                    return null;
62:                }
63:                synchronized (data) {
64:                    if (data.getCursorPosition() > 0) {
65:                        return Boolean.FALSE;
66:                    }
67:                    if (data.isAdvanceable() == false) {
68:                        return Boolean.TRUE;
69:                    }
70:                    return Boolean.FALSE;
71:                }
72:            }
73:        }
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