001 /**
002 * ========================================
003 * JFreeReport : a free Java report library
004 * ========================================
005 *
006 * Project Info: http://reporting.pentaho.org/
007 *
008 * (C) Copyright 2000-2007, by Object Refinery Limited, Pentaho Corporation and Contributors.
009 *
010 * This library is free software; you can redistribute it and/or modify it under the terms
011 * of the GNU Lesser General Public License as published by the Free Software Foundation;
012 * either version 2.1 of the License, or (at your option) any later version.
013 *
014 * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
015 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
016 * See the GNU Lesser General Public License for more details.
017 *
018 * You should have received a copy of the GNU Lesser General Public License along with this
019 * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
020 * Boston, MA 02111-1307, USA.
021 *
022 * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
023 * in the United States and other countries.]
024 *
025 * ------------
026 * $Id: IsExportTypeExpression.java,v 1.5 2007/04/01 18:49:25 taqua Exp $
027 * ------------
028 * (C) Copyright 2000-2005, by Object Refinery Limited.
029 * (C) Copyright 2005-2007, by Pentaho Corporation.
030 */
031 package org.jfree.report.expressions.sys;
032
033 import org.jfree.report.expressions.AbstractExpression;
034 import org.jfree.report.expressions.ExpressionException;
035 import org.jfree.report.flow.ReportContext;
036
037
038 /**
039 * Tests, whether a certain export type is currently used.
040 *
041 * @author Thomas Morgner
042 */
043 public class IsExportTypeExpression extends AbstractExpression
044 {
045 private String exportType;
046
047 public IsExportTypeExpression()
048 {
049 }
050
051 public String getExportType()
052 {
053 return exportType;
054 }
055
056 public void setExportType(final String exportType)
057 {
058 this.exportType = exportType;
059 }
060
061 /**
062 * Return the current expression value. <P> The value depends (obviously) on
063 * the expression implementation.
064 *
065 * @return the value of the function.
066 */
067 public Object computeValue() throws ExpressionException
068 {
069 if (exportType == null)
070 {
071 return Boolean.FALSE;
072 }
073 final ReportContext reportContext = getRuntime().getReportContext();
074 if (reportContext.getExportDescriptor().startsWith(exportType))
075 {
076 return Boolean.TRUE;
077 }
078 return Boolean.FALSE;
079 }
080 }