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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   * This class represents a conversion rule It uses a Pattern and defines for
    32   * each capturing group of this Pattern a replacement text
    33   *
    34   * @author jean-noelcharpin
    35   *
    36   */
    37  public class MultiGroupConversionRule implements ConversionRule {
    38
    39      // It is extremely unlikely to encounter more than 10 groups in one of
    40      // our conversion reg-expressions
    41      final private static int MAX_GROUPS = 10;
    42
    43      private Pattern pattern;
    44      private String[] replacementTable = new String[MAX_GROUPS];
    45
    46      public MultiGroupConversionRule(Pattern pattern) {
    47          this.pattern = pattern;
    48      }
    49
    50      /*
    51       * (non-Javadoc)
    52       *
    53       * @see org.slf4j.converter.ConversionRule#getPattern()
    54       */
    55      public Pattern getPattern() {
    56          return pattern;
    57      }
    58
    59      public void addReplacement(int groupIndex, String replacement) {
    60          if (groupIndex == 0) {
    61              throw new IllegalArgumentException("regex groups start at 1, not zero");
    62          }
    63          replacementTable[groupIndex] = replacement;
    64      }
    65
    66      /*
    67       * (non-Javadoc)
    68       *
    69       * @see org.slf4j.converter.ConversionRule#getReplacement(java.lang.Integer)
    70       */
    71      public String getReplacement(int groupIndex) {
    72          return replacementTable[groupIndex];
    73      }
    74
    75      /*
    76       * (non-Javadoc)
    77       *
    78       * @see org.slf4j.converter.ConversionRule#replace(java.util.regex.Matcher)
    79       */
    80      public String replace(Matcher matcher) {
    81          StringBuilder replacementBuffer = new StringBuilder();
    82          String replacementText;
    83
    84          for (int group = 1; group <= matcher.groupCount(); group++) {
    85              replacementText = getReplacement(group);
    86              if (replacementText != null) {
    87                  // System.out.println("replacing group " + group + " : "
    88                  // + matcher.group(group) + " with " + replacementText);
    89                  replacementBuffer.append(replacementText);
    90              } else {
    91                  replacementBuffer.append(matcher.group(group));
    92              }
    93          }
    94          return replacementBuffer.toString();
    95      }
    96
    97      public String getAdditionalLine() {
    98          return null;
    99      }
    100 }