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: AbstractCompareOperator.java 3522 2007-10-16 10:56:57Z tmorgner $ 028 * ------------ 029 * (C) Copyright 2006-2007, by Pentaho Corporation. 030 */ 031 032 package org.jfree.formula.operators; 033 034 import org.jfree.formula.lvalues.TypeValuePair; 035 import org.jfree.formula.FormulaContext; 036 import org.jfree.formula.EvaluationException; 037 import org.jfree.formula.LibFormulaErrorValue; 038 import org.jfree.formula.typing.TypeRegistry; 039 import org.jfree.formula.typing.Type; 040 import org.jfree.formula.typing.ExtendedComparator; 041 import org.jfree.formula.typing.coretypes.LogicalType; 042 043 /** 044 * Creation-Date: 06.06.2007, 18:52:25 045 * 046 * @author Thomas Morgner 047 */ 048 public abstract class AbstractCompareOperator implements InfixOperator 049 { 050 private static final TypeValuePair RETURN_TRUE = new TypeValuePair(LogicalType.TYPE, Boolean.TRUE); 051 private static final TypeValuePair RETURN_FALSE = new TypeValuePair(LogicalType.TYPE, Boolean.FALSE); 052 053 public AbstractCompareOperator() 054 { 055 } 056 057 public final TypeValuePair evaluate(final FormulaContext context, 058 final TypeValuePair value1, 059 final TypeValuePair value2) 060 throws EvaluationException 061 { 062 final TypeRegistry typeRegistry = context.getTypeRegistry(); 063 final Type type1 = value1.getType(); 064 final Type type2 = value2.getType(); 065 final Object value1Raw = value1.getValue(); 066 final Object value2Raw = value2.getValue(); 067 if (value1Raw == null || value2Raw == null) 068 { 069 throw new EvaluationException(LibFormulaErrorValue.ERROR_NA_VALUE); 070 } 071 072 final ExtendedComparator comparator = typeRegistry.getComparator(type1, type2); 073 final Integer result = comparator.compare (type1, value1Raw, type2, value2Raw); 074 if (result == null) 075 { 076 throw new EvaluationException 077 (LibFormulaErrorValue.ERROR_INVALID_ARGUMENT_VALUE); 078 } 079 080 if (evaluate(result.intValue())) 081 { 082 return RETURN_TRUE; 083 } 084 return RETURN_FALSE; 085 } 086 087 protected abstract boolean evaluate(int compareResult); 088 }