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 2725 2007-04-01 18:49:29Z taqua $
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    }