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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: NullFunction.java,v 1.3 2007/04/01 13:51:53 taqua Exp $ 28: * ------------ 29: * (C) Copyright 2006-2007, by Pentaho Corporation. 30: */ 31: 32: package org.jfree.formula.function.userdefined; 33: 34: import org.jfree.formula.FormulaContext; 35: import org.jfree.formula.function.ParameterCallback; 36: import org.jfree.formula.lvalues.TypeValuePair; 37: import org.jfree.formula.typing.coretypes.AnyType; 38: 39: /** 40: * Creation-Date: Dec 18, 2006, 12:54:55 PM 41: * 42: * @author Thomas Morgner 43: */ 44: public class NullFunction 45: { 46: private static final TypeValuePair NULL = new TypeValuePair(AnyType.TYPE, null); 47: 48: public NullFunction() 49: { 50: } 51: 52: public String getCanonicalName() 53: { 54: return "NULL"; 55: } 56: 57: public TypeValuePair evaluate(FormulaContext context, 58: ParameterCallback parameters) 59: { 60: return NULL; 61: } 62: 63: }