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    }