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: FormulaParser.java 3521 2007-10-16 10:55:14Z tmorgner $ 028 * ------------ 029 * (C) Copyright 2006-2007, by Pentaho Corporation. 030 */ 031 package org.jfree.formula.parser; 032 033 import java.io.StringReader; 034 035 import org.jfree.formula.DefaultFormulaContext; 036 import org.jfree.formula.EvaluationException; 037 import org.jfree.formula.LibFormulaBoot; 038 import org.jfree.formula.lvalues.LValue; 039 import org.jfree.formula.operators.DefaultOperatorFactory; 040 import org.jfree.formula.operators.OperatorFactory; 041 042 public class FormulaParser extends GeneratedFormulaParser 043 { 044 // This is my parser class 045 private OperatorFactory operatorFactory; 046 047 public FormulaParser() 048 { 049 super(new StringReader("")); 050 operatorFactory = new DefaultOperatorFactory(); 051 operatorFactory.initalize(LibFormulaBoot.getInstance().getGlobalConfig()); 052 } 053 054 protected OperatorFactory getOperatorFactory() 055 { 056 return operatorFactory; 057 } 058 059 public LValue parse(final String formula) throws ParseException 060 { 061 if (formula == null) 062 { 063 throw new NullPointerException("Formula-text given must not be null."); 064 } 065 ReInit(new StringReader(formula)); 066 return getExpression(); 067 } 068 069 public static void main(final String[] args) 070 throws ParseException, EvaluationException 071 { 072 final FormulaParser parser = new FormulaParser(); 073 074 // x = parser.parse("1 * 2 + 3 * 4"); 075 // x.initialize(new DefaultFormulaContext()); 076 // System.out.println(x); 077 // 078 // x = parser.parse("[a] * [b] + [c] * [d]"); 079 // x.initialize(new DefaultFormulaContext()); 080 // System.out.println(x); 081 // 082 // x = parser.parse("IF([A];[B];[C])"); 083 // x.initialize(new DefaultFormulaContext()); 084 // System.out.println(x); 085 // 086 // x = parser.parse("1 + ( 2+ (3 + (400 + 200)))"); 087 // x.initialize(new DefaultFormulaContext()); 088 // System.out.println(x); 089 090 final LValue x = parser.parse("(1)()"); 091 x.initialize(new DefaultFormulaContext()); 092 System.out.println(x); 093 } 094 }