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: PlusSignOperator.java 2887 2007-06-06 17:07:52Z taqua $ 028 * ------------ 029 * (C) Copyright 2006-2007, by Pentaho Corporation. 030 */ 031 package org.jfree.formula.operators; 032 033 import org.jfree.formula.EvaluationException; 034 import org.jfree.formula.FormulaContext; 035 import org.jfree.formula.LibFormulaErrorValue; 036 import org.jfree.formula.lvalues.TypeValuePair; 037 038 /** 039 * This is a no-op-operator which is equal to "zero plus x". 040 * 041 * @author Thomas Morgner 042 */ 043 public class PlusSignOperator implements PrefixOperator 044 { 045 public PlusSignOperator() 046 { 047 } 048 049 public TypeValuePair evaluate(final FormulaContext context, 050 final TypeValuePair value1) throws EvaluationException 051 { 052 if (value1 == null) 053 { 054 // This is fatal, but should never happen. 055 throw new EvaluationException(LibFormulaErrorValue.ERROR_UNEXPECTED_VALUE); 056 } 057 return value1; 058 } 059 060 public String toString() 061 { 062 return "+"; 063 } 064 065 }