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: PrecomputedExpressionSlot.java 3525 2007-10-16 11:43:48Z tmorgner $
027     * ------------
028     * (C) Copyright 2000-2005, by Object Refinery Limited.
029     * (C) Copyright 2005-2007, by Pentaho Corporation.
030     */
031    
032    package org.jfree.report.data;
033    
034    import org.jfree.report.DataRow;
035    import org.jfree.report.DataSourceException;
036    
037    /**
038     * Creation-Date: 25.11.2006, 15:18:58
039     *
040     * @author Thomas Morgner
041     */
042    public class PrecomputedExpressionSlot implements ExpressionSlot
043    {
044      private String name;
045      private Object value;
046      private boolean preserve;
047    
048      public PrecomputedExpressionSlot(final String name,
049                                       final Object value,
050                                       final boolean preserve)
051      {
052        this.preserve = preserve;
053        this.name = name;
054        this.value = value;
055      }
056    
057      public Object getValue() throws DataSourceException
058      {
059        return value;
060      }
061    
062      public void advance() throws DataSourceException
063      {
064        // does nothing ...
065      }
066    
067      public void updateDataRow(final DataRow dataRow)
068      {
069        // does nothing ...
070      }
071    
072      public String getName()
073      {
074        return name;
075      }
076    
077      public boolean isDeepTraversing()
078      {
079        return false;
080      }
081    
082      /**
083       * Returns a clone of the object.
084       *
085       * @return A clone.
086       * @throws CloneNotSupportedException if cloning is not supported for some
087       *                                    reason.
088       */
089      public Object clone() throws CloneNotSupportedException
090      {
091        return super.clone();
092      }
093    
094      public boolean isPreserve()
095      {
096        return preserve;
097      }
098    
099    }