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1: /** 2: * ========================================= 3: * LibFormula : a free Java formula library 4: * ========================================= 5: * 6: * Project Info: http://reporting.pentaho.org/libformula/ 7: * 8: * (C) Copyright 2006-2007, by 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: * ------------ 27: * $Id: StaticValue.java 3521 2007-10-16 10:55:14Z tmorgner $ 28: * ------------ 29: * (C) Copyright 2006-2007, by Pentaho Corporation. 30: */ 31: package org.jfree.formula.lvalues; 32: 33: import org.jfree.formula.EvaluationException; 34: import org.jfree.formula.FormulaContext; 35: import org.jfree.formula.typing.Type; 36: import org.jfree.formula.typing.coretypes.AnyType; 37: 38: /** 39: * Creation-Date: 08.10.2006, 11:34:40 40: * 41: * @author Thomas Morgner 42: */ 43: public class StaticValue extends AbstractLValue 44: { 45: private Object value; 46: private Type type; 47: 48: public StaticValue(final Object value) 49: { 50: this(value, AnyType.TYPE); 51: } 52: 53: public StaticValue(final Object value, final Type type) 54: { 55: this.value = value; 56: this.type = type; 57: } 58: 59: public void initialize(final FormulaContext context) throws EvaluationException 60: { 61: } 62: 63: public TypeValuePair evaluate() 64: { 65: return new TypeValuePair(type, value); 66: } 67: 68: 69: public String toString() 70: { 71: return String.valueOf(value); 72: } 73: 74: /** 75: * Checks, whether the LValue is constant. Constant lvalues always return the 76: * same value. 77: * 78: * @return 79: */ 80: public boolean isConstant() 81: { 82: return true; 83: } 84: 85: public Object getValue() 86: { 87: return value; 88: } 89: 90: /** 91: * This function allows a program traversing the LibFormula object model 92: * to know what type this static value is. 93: * 94: * @return the type of the static value 95: * 96: */ 97: public Type getValueType() 98: { 99: return type; 100: } 101: }