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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: PlusSignOperator.java,v 1.4 2007/06/06 17:07:52 taqua Exp $ 28: * ------------ 29: * (C) Copyright 2006-2007, by Pentaho Corporation. 30: */ 31: package org.jfree.formula.operators; 32: 33: import org.jfree.formula.EvaluationException; 34: import org.jfree.formula.FormulaContext; 35: import org.jfree.formula.LibFormulaErrorValue; 36: import org.jfree.formula.lvalues.TypeValuePair; 37: 38: /** 39: * This is a no-op-operator which is equal to "zero plus x". 40: * 41: * @author Thomas Morgner 42: */ 43: public class PlusSignOperator implements PrefixOperator 44: { 45: public PlusSignOperator() 46: { 47: } 48: 49: public TypeValuePair evaluate(final FormulaContext context, 50: final TypeValuePair value1) throws EvaluationException 51: { 52: if (value1 == null) 53: { 54: // This is fatal, but should never happen. 55: throw new EvaluationException(LibFormulaErrorValue.ERROR_UNEXPECTED_VALUE); 56: } 57: return value1; 58: } 59: 60: public String toString() 61: { 62: return "+"; 63: } 64: 65: }