Source for org.jfree.report.data.PrecomputedExpressionSlot

   1: /**
   2:  * ========================================
   3:  * JFreeReport : a free Java report library
   4:  * ========================================
   5:  *
   6:  * Project Info:  http://reporting.pentaho.org/
   7:  *
   8:  * (C) Copyright 2000-2007, by Object Refinery Limited, Pentaho Corporation and Contributors.
   9:  *
  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: PrecomputedExpressionSlot.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:  */
  31: 
  32: package org.jfree.report.data;
  33: 
  34: import org.jfree.report.DataRow;
  35: import org.jfree.report.DataSourceException;
  36: 
  37: /**
  38:  * Creation-Date: 25.11.2006, 15:18:58
  39:  *
  40:  * @author Thomas Morgner
  41:  */
  42: public class PrecomputedExpressionSlot implements ExpressionSlot
  43: {
  44:   private String name;
  45:   private Object value;
  46:   private boolean preserve;
  47: 
  48:   public PrecomputedExpressionSlot(final String name,
  49:                                    final Object value,
  50:                                    final boolean preserve)
  51:   {
  52:     this.preserve = preserve;
  53:     this.name = name;
  54:     this.value = value;
  55:   }
  56: 
  57:   public Object getValue() throws DataSourceException
  58:   {
  59:     return value;
  60:   }
  61: 
  62:   public void advance() throws DataSourceException
  63:   {
  64:     // does nothing ...
  65:   }
  66: 
  67:   public void updateDataRow(final DataRow dataRow)
  68:   {
  69:     // does nothing ...
  70:   }
  71: 
  72:   public String getName()
  73:   {
  74:     return name;
  75:   }
  76: 
  77:   public boolean isDeepTraversing()
  78:   {
  79:     return false;
  80:   }
  81: 
  82:   /**
  83:    * Returns a clone of the object.
  84:    *
  85:    * @return A clone.
  86:    * @throws CloneNotSupportedException if cloning is not supported for some
  87:    *                                    reason.
  88:    */
  89:   public Object clone() throws CloneNotSupportedException
  90:   {
  91:     return super.clone();
  92:   }
  93: 
  94:   public boolean isPreserve()
  95:   {
  96:     return preserve;
  97:   }
  98: 
  99: }