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 }