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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: AddOperator.java,v 1.10 2007/04/10 14:10:41 taqua Exp $ 28: * ------------ 29: * (C) Copyright 2006-2007, by Pentaho Corporation. 30: */ 31: package org.jfree.formula.operators; 32: 33: import java.math.BigDecimal; 34: 35: /** 36: * Null-Values are converted into ZERO 37: * 38: * @author Thomas Morgner 39: */ 40: public class AddOperator extends AbstractNumericOperator 41: { 42: public AddOperator() 43: { 44: } 45: 46: public Number evaluate(final Number number1, final Number number2) 47: { 48: if ((number1 instanceof Integer || number1 instanceof Short) && 49: (number2 instanceof Integer || number2 instanceof Short)) 50: { 51: return new BigDecimal (number1.longValue() + number2.longValue()); 52: } 53: 54: final BigDecimal bd1 = new BigDecimal(number1.toString()); 55: final BigDecimal bd2 = new BigDecimal(number2.toString()); 56: return bd1.add(bd2); 57: } 58: 59: public int getLevel() 60: { 61: return 200; 62: } 63: 64: 65: public String toString() 66: { 67: return "+"; 68: } 69: 70: public boolean isLeftOperation() 71: { 72: return true; 73: } 74: 75: /** 76: * Defines, whether the operation is associative. For associative operations, 77: * the evaluation order does not matter, if the operation appears more than 78: * once in an expression, and therefore we can optimize them a lot better than 79: * non-associative operations (ie. merge constant parts and precompute them 80: * once). 81: * 82: * @return true, if the operation is associative, false otherwise 83: */ 84: public boolean isAssociative() 85: { 86: return true; 87: } 88: 89: }