001 /** 002 * ========================================= 003 * LibFormula : a free Java formula library 004 * ========================================= 005 * 006 * Project Info: http://reporting.pentaho.org/libformula/ 007 * 008 * (C) Copyright 2006-2007, by 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 * ------------ 027 * $Id: StaticValue.java 3521 2007-10-16 10:55:14Z tmorgner $ 028 * ------------ 029 * (C) Copyright 2006-2007, by Pentaho Corporation. 030 */ 031 package org.jfree.formula.lvalues; 032 033 import org.jfree.formula.EvaluationException; 034 import org.jfree.formula.FormulaContext; 035 import org.jfree.formula.typing.Type; 036 import org.jfree.formula.typing.coretypes.AnyType; 037 038 /** 039 * Creation-Date: 08.10.2006, 11:34:40 040 * 041 * @author Thomas Morgner 042 */ 043 public class StaticValue extends AbstractLValue 044 { 045 private Object value; 046 private Type type; 047 048 public StaticValue(final Object value) 049 { 050 this(value, AnyType.TYPE); 051 } 052 053 public StaticValue(final Object value, final Type type) 054 { 055 this.value = value; 056 this.type = type; 057 } 058 059 public void initialize(final FormulaContext context) throws EvaluationException 060 { 061 } 062 063 public TypeValuePair evaluate() 064 { 065 return new TypeValuePair(type, value); 066 } 067 068 069 public String toString() 070 { 071 return String.valueOf(value); 072 } 073 074 /** 075 * Checks, whether the LValue is constant. Constant lvalues always return the 076 * same value. 077 * 078 * @return 079 */ 080 public boolean isConstant() 081 { 082 return true; 083 } 084 085 public Object getValue() 086 { 087 return value; 088 } 089 090 /** 091 * This function allows a program traversing the LibFormula object model 092 * to know what type this static value is. 093 * 094 * @return the type of the static value 095 * 096 */ 097 public Type getValueType() 098 { 099 return type; 100 } 101 }