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,v 1.4 2007/04/01 18:49:24 taqua Exp $
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(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 }