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1   /**
2    * Copyright (c) 2004-2011 QOS.ch
3    * All rights reserved.
4    *
5    * Permission is hereby granted, free  of charge, to any person obtaining
6    * a  copy  of this  software  and  associated  documentation files  (the
7    * "Software"), to  deal in  the Software without  restriction, including
8    * without limitation  the rights to  use, copy, modify,  merge, publish,
9    * distribute,  sublicense, and/or sell  copies of  the Software,  and to
10   * permit persons to whom the Software  is furnished to do so, subject to
11   * the following conditions:
12   *
13   * The  above  copyright  notice  and  this permission  notice  shall  be
14   * included in all copies or substantial portions of the Software.
15   *
16   * THE  SOFTWARE IS  PROVIDED  "AS  IS", WITHOUT  WARRANTY  OF ANY  KIND,
17   * EXPRESS OR  IMPLIED, INCLUDING  BUT NOT LIMITED  TO THE  WARRANTIES OF
18   * MERCHANTABILITY,    FITNESS    FOR    A   PARTICULAR    PURPOSE    AND
19   * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
20   * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
21   * OF CONTRACT, TORT OR OTHERWISE,  ARISING FROM, OUT OF OR IN CONNECTION
22   * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
23   *
24   */
25  package org.slf4j.migrator.line;
26  
27  import java.util.regex.Matcher;
28  import java.util.regex.Pattern;
29  
30  
31  /**
32   * This class represents a conversion rule It uses a Pattern and defines for
33   * each capturing group of this Pattern a replacement text
34   * 
35   * @author jean-noelcharpin
36   * 
37   */
38  public class MultiGroupConversionRule implements ConversionRule {
39   
40    // It is extremely unlikely to encounter more than 10 groups in one of 
41    // our conversion reg-expressions
42    final private static int MAX_GROUPS = 10;
43  
44    private Pattern pattern;
45    private String[] replacementTable = new String[MAX_GROUPS];
46  
47    public MultiGroupConversionRule(Pattern pattern) {
48      this.pattern = pattern;
49    }
50  
51    /* (non-Javadoc)
52     * @see org.slf4j.converter.ConversionRule#getPattern()
53     */
54    public Pattern getPattern() {
55      return pattern;
56    }
57  
58    public void addReplacement(int groupIndex, String replacement) {
59      if(groupIndex == 0) {
60        throw new IllegalArgumentException("regex groups start at 1, not zero");
61      }
62      replacementTable[groupIndex] = replacement;
63    }
64  
65    /* (non-Javadoc)
66     * @see org.slf4j.converter.ConversionRule#getReplacement(java.lang.Integer)
67     */
68    public String getReplacement(int groupIndex) {
69      return  replacementTable[groupIndex];
70    }
71  
72    /* (non-Javadoc)
73     * @see org.slf4j.converter.ConversionRule#replace(java.util.regex.Matcher)
74     */
75    public String replace(Matcher matcher) {
76      StringBuffer replacementBuffer = new StringBuffer();
77      String replacementText;
78      
79      for (int group = 1; group <= matcher.groupCount(); group++) {
80        replacementText = getReplacement(group);
81        if (replacementText != null) {
82          //System.out.println("replacing group " + group + " : "
83          //    + matcher.group(group) + " with " + replacementText);
84          replacementBuffer.append(replacementText);
85        } else  {
86          replacementBuffer.append(matcher.group(group));
87        }
88      }
89      return replacementBuffer.toString();
90    }
91  
92    public String getAdditionalLine() {
93      return null;
94    }
95  }