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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: AbstractCompareOperator.java 3522 2007-10-16 10:56:57Z tmorgner $ 28: * ------------ 29: * (C) Copyright 2006-2007, by Pentaho Corporation. 30: */ 31: 32: package org.jfree.formula.operators; 33: 34: import org.jfree.formula.lvalues.TypeValuePair; 35: import org.jfree.formula.FormulaContext; 36: import org.jfree.formula.EvaluationException; 37: import org.jfree.formula.LibFormulaErrorValue; 38: import org.jfree.formula.typing.TypeRegistry; 39: import org.jfree.formula.typing.Type; 40: import org.jfree.formula.typing.ExtendedComparator; 41: import org.jfree.formula.typing.coretypes.LogicalType; 42: 43: /** 44: * Creation-Date: 06.06.2007, 18:52:25 45: * 46: * @author Thomas Morgner 47: */ 48: public abstract class AbstractCompareOperator implements InfixOperator 49: { 50: private static final TypeValuePair RETURN_TRUE = new TypeValuePair(LogicalType.TYPE, Boolean.TRUE); 51: private static final TypeValuePair RETURN_FALSE = new TypeValuePair(LogicalType.TYPE, Boolean.FALSE); 52: 53: public AbstractCompareOperator() 54: { 55: } 56: 57: public final TypeValuePair evaluate(final FormulaContext context, 58: final TypeValuePair value1, 59: final TypeValuePair value2) 60: throws EvaluationException 61: { 62: final TypeRegistry typeRegistry = context.getTypeRegistry(); 63: final Type type1 = value1.getType(); 64: final Type type2 = value2.getType(); 65: final Object value1Raw = value1.getValue(); 66: final Object value2Raw = value2.getValue(); 67: if (value1Raw == null || value2Raw == null) 68: { 69: throw new EvaluationException(LibFormulaErrorValue.ERROR_NA_VALUE); 70: } 71: 72: final ExtendedComparator comparator = typeRegistry.getComparator(type1, type2); 73: final Integer result = comparator.compare (type1, value1Raw, type2, value2Raw); 74: if (result == null) 75: { 76: throw new EvaluationException 77: (LibFormulaErrorValue.ERROR_INVALID_ARGUMENT_VALUE); 78: } 79: 80: if (evaluate(result.intValue())) 81: { 82: return RETURN_TRUE; 83: } 84: return RETURN_FALSE; 85: } 86: 87: protected abstract boolean evaluate(int compareResult); 88: }