001 /*--------------------------------------------------------------------------+ 002 $Id: RegexReplacementProcessor.java 26283 2010-02-18 11:18:57Z juergens $ 003 | | 004 | Copyright 2005-2010 Technische Universitaet Muenchen | 005 | | 006 | Licensed under the Apache License, Version 2.0 (the "License"); | 007 | you may not use this file except in compliance with the License. | 008 | You may obtain a copy of the License at | 009 | | 010 | http://www.apache.org/licenses/LICENSE-2.0 | 011 | | 012 | Unless required by applicable law or agreed to in writing, software | 013 | distributed under the License is distributed on an "AS IS" BASIS, | 014 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | 015 | See the License for the specific language governing permissions and | 016 | limitations under the License. | 017 +--------------------------------------------------------------------------*/ 018 package edu.tum.cs.commons.string; 019 020 import java.util.List; 021 import java.util.regex.Matcher; 022 import java.util.regex.PatternSyntaxException; 023 024 /** 025 * This class allows the application of multiplex {@link IRegexReplacement}s to 026 * a string. 027 * 028 * 029 * @author Florian Deissenboeck 030 * @author $Author: juergens $ 031 * @version $Rev: 26283 $ 032 * @levd.rating GREEN Hash: 34CDDB3007890E0011169AE24AE44CA9 033 */ 034 public class RegexReplacementProcessor { 035 /** The list of replacements. */ 036 private final List<IRegexReplacement> expressions; 037 038 /** Create a new replacement processor. */ 039 public RegexReplacementProcessor(List<IRegexReplacement> expressions) { 040 this.expressions = expressions; 041 } 042 043 /** 044 * Apply replacements to a string. 045 * 046 * @return the input string after the application of all replacements or the 047 * a copy of the input string if the list of replacements is empty. 048 * @throws PatternSyntaxException 049 * unfortunately method 050 * {@link Matcher#replaceAll(java.lang.String)} throws an 051 * {@link IndexOutOfBoundsException} if a non-existent capturing 052 * group is referenced. This method converts this exception to a 053 * {@link PatternSyntaxException}. 054 */ 055 public String process(String text) throws PatternSyntaxException { 056 // if expression list ist empty this returns the original string 057 String result = text; 058 for (IRegexReplacement expr : expressions) { 059 Matcher matcher = expr.getPattern().matcher(result); 060 String replacement = expr.getReplacement(); 061 062 try { 063 result = matcher.replaceAll(replacement); 064 } catch (IndexOutOfBoundsException ex) { 065 throw new PatternSyntaxException(ex.getMessage(), replacement, 066 -1); 067 } 068 } 069 070 return result; 071 } 072 }