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 }