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: ReplaceFunction.java 2785 2007-05-08 11:12:25Z taqua $ 028 * ------------ 029 * (C) Copyright 2006-2007, by Pentaho Corporation. 030 */ 031 package org.jfree.formula.function.text; 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.TypeRegistry; 041 import org.jfree.formula.typing.coretypes.TextType; 042 043 /** 044 * This function returns text where an old text is substituted with a new text. 045 * 046 * @author Cedric Pronzato 047 */ 048 public class ReplaceFunction implements Function 049 { 050 public ReplaceFunction() 051 { 052 } 053 054 public TypeValuePair evaluate(final FormulaContext context, 055 final ParameterCallback parameters) throws EvaluationException 056 { 057 final int parameterCount = parameters.getParameterCount(); 058 if (parameterCount != 4) 059 { 060 throw new EvaluationException(LibFormulaErrorValue.ERROR_ARGUMENTS_VALUE); 061 } 062 final TypeRegistry typeRegistry = context.getTypeRegistry(); 063 064 final Type newTextType = parameters.getType(3); 065 final Object newTextValue = parameters.getValue(3); 066 final Type textType = parameters.getType(0); 067 final Object textValue = parameters.getValue(0); 068 final Type startType = parameters.getType(1); 069 final Object startValue = parameters.getValue(1); 070 final Type lengthType = parameters.getType(2); 071 final Object lengthValue = parameters.getValue(2); 072 073 final String newText = typeRegistry.convertToText(newTextType, newTextValue); 074 final String text = typeRegistry.convertToText(textType, textValue); 075 final Number start = typeRegistry.convertToNumber(startType, startValue); 076 final Number length = typeRegistry.convertToNumber(lengthType, lengthValue); 077 078 final MidFunction function = new MidFunction(); 079 final String result1 = function.process(text, new Integer(1), new Integer(start.intValue() - 1)); 080 final String result2 = function.process(text, 081 new Integer(start.intValue() + length.intValue()), new Integer(text.length())); 082 083 084 final StringBuffer buffer = new StringBuffer(); 085 buffer.append(result1); 086 buffer.append(newText); 087 buffer.append(result2); 088 return new TypeValuePair(TextType.TYPE, buffer.toString()); 089 } 090 091 public String getCanonicalName() 092 { 093 return "REPLACE"; 094 } 095 096 }