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: AndFunction.java 3521 2007-10-16 10:55:14Z tmorgner $ 028 * ------------ 029 * (C) Copyright 2006-2007, by Pentaho Corporation. 030 */ 031 package org.jfree.formula.function.logical; 032 033 import org.jfree.formula.EvaluationException; 034 import org.jfree.formula.FormulaContext; 035 import org.jfree.formula.LibFormulaErrorValue; 036 import org.jfree.formula.function.Function; 037 import org.jfree.formula.function.ParameterCallback; 038 import org.jfree.formula.lvalues.TypeValuePair; 039 import org.jfree.formula.typing.Type; 040 import org.jfree.formula.typing.coretypes.LogicalType; 041 042 /** 043 * Creation-Date: 04.11.2006, 18:28:15 044 * 045 * @author Thomas Morgner 046 */ 047 public class AndFunction implements Function 048 { 049 private static final TypeValuePair RETURN_TRUE = new TypeValuePair(LogicalType.TYPE, Boolean.TRUE); 050 private static final TypeValuePair RETURN_FALSE = new TypeValuePair(LogicalType.TYPE, Boolean.FALSE); 051 052 public AndFunction() 053 { 054 } 055 056 public String getCanonicalName() 057 { 058 return "AND"; 059 } 060 061 public TypeValuePair evaluate(final FormulaContext context, 062 final ParameterCallback parameters) 063 throws EvaluationException 064 { 065 final int length = parameters.getParameterCount(); 066 if(length < 1) 067 { 068 throw new EvaluationException(LibFormulaErrorValue.ERROR_ARGUMENTS_VALUE); 069 } 070 for (int i = 0; i < length; i++) 071 { 072 final Object value = parameters.getValue(i); 073 final Type type1 = parameters.getType(i); 074 final Boolean condition = context.getTypeRegistry().convertToLogical(type1, value); 075 if(condition == null) 076 { 077 throw new EvaluationException(LibFormulaErrorValue.ERROR_INVALID_ARGUMENT_VALUE); 078 } 079 if (Boolean.FALSE.equals(condition)) 080 { 081 return RETURN_FALSE; 082 } 083 } 084 return RETURN_TRUE; 085 } 086 }