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1   /**
2    * Logback: the reliable, generic, fast and flexible logging framework.
3    * Copyright (C) 1999-2015, QOS.ch. All rights reserved.
4    *
5    * This program and the accompanying materials are dual-licensed under
6    * either the terms of the Eclipse Public License v1.0 as published by
7    * the Eclipse Foundation
8    *
9    *   or (per the licensee's choosing)
10   *
11   * under the terms of the GNU Lesser General Public License version 2.1
12   * as published by the Free Software Foundation.
13   */
14  package ch.qos.logback.core.pattern;
15  
16  import java.util.List;
17  import java.util.regex.Pattern;
18  
19  public class ReplacingCompositeConverter<E> extends CompositeConverter<E> {
20  
21      Pattern pattern;
22      String regex;
23      String replacement;
24  
25      public void start() {
26          final List<String> optionList = getOptionList();
27          if (optionList == null) {
28              addError("at least two options are expected whereas you have declared none");
29              return;
30          }
31  
32          int numOpts = optionList.size();
33  
34          if (numOpts < 2) {
35              addError("at least two options are expected whereas you have declared only " + numOpts + "as [" + optionList + "]");
36              return;
37          }
38          regex = optionList.get(0);
39          pattern = Pattern.compile(regex);
40          replacement = optionList.get(1);
41          super.start();
42      }
43  
44      @Override
45      protected String transform(E event, String in) {
46          if (!started)
47              return in;
48          return pattern.matcher(in).replaceAll(replacement);
49      }
50  }