001/**
002 * Copyright (c) 2004-2011 QOS.ch
003 * All rights reserved.
004 *
005 * Permission is hereby granted, free  of charge, to any person obtaining
006 * a  copy  of this  software  and  associated  documentation files  (the
007 * "Software"), to  deal in  the Software without  restriction, including
008 * without limitation  the rights to  use, copy, modify,  merge, publish,
009 * distribute,  sublicense, and/or sell  copies of  the Software,  and to
010 * permit persons to whom the Software  is furnished to do so, subject to
011 * the following conditions:
012 *
013 * The  above  copyright  notice  and  this permission  notice  shall  be
014 * included in all copies or substantial portions of the Software.
015 *
016 * THE  SOFTWARE IS  PROVIDED  "AS  IS", WITHOUT  WARRANTY  OF ANY  KIND,
017 * EXPRESS OR  IMPLIED, INCLUDING  BUT NOT LIMITED  TO THE  WARRANTIES OF
018 * MERCHANTABILITY,    FITNESS    FOR    A   PARTICULAR    PURPOSE    AND
019 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
020 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
021 * OF CONTRACT, TORT OR OTHERWISE,  ARISING FROM, OUT OF OR IN CONNECTION
022 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
023 *
024 */
025package org.slf4j.migrator.line;
026
027import java.util.regex.Matcher;
028import java.util.regex.Pattern;
029
030/**
031 * This class represents a conversion rule It uses a Pattern and defines for
032 * each capturing group of this Pattern a replacement text
033 * 
034 * @author jean-noelcharpin
035 * 
036 */
037public class MultiGroupConversionRule implements ConversionRule {
038
039    // It is extremely unlikely to encounter more than 10 groups in one of
040    // our conversion reg-expressions
041    final private static int MAX_GROUPS = 10;
042
043    private final Pattern pattern;
044    private final String[] replacementTable = new String[MAX_GROUPS];
045
046    public MultiGroupConversionRule(Pattern pattern) {
047        this.pattern = pattern;
048    }
049
050    /*
051     * (non-Javadoc)
052     * 
053     * @see org.slf4j.converter.ConversionRule#getPattern()
054     */
055    public Pattern getPattern() {
056        return pattern;
057    }
058
059    public void addReplacement(int groupIndex, String replacement) {
060        if (groupIndex == 0) {
061            throw new IllegalArgumentException("regex groups start at 1, not zero");
062        }
063        replacementTable[groupIndex] = replacement;
064    }
065
066    /*
067     * (non-Javadoc)
068     * 
069     * @see org.slf4j.converter.ConversionRule#getReplacement(java.lang.Integer)
070     */
071    public String getReplacement(int groupIndex) {
072        return replacementTable[groupIndex];
073    }
074
075    /*
076     * (non-Javadoc)
077     * 
078     * @see org.slf4j.converter.ConversionRule#replace(java.util.regex.Matcher)
079     */
080    public String replace(Matcher matcher) {
081        StringBuilder replacementBuffer = new StringBuilder();
082        String replacementText;
083
084        for (int group = 1; group <= matcher.groupCount(); group++) {
085            replacementText = getReplacement(group);
086            if (replacementText != null) {
087                // System.out.println("replacing group " + group + " : "
088                // + matcher.group(group) + " with " + replacementText);
089                replacementBuffer.append(replacementText);
090            } else {
091                replacementBuffer.append(matcher.group(group));
092            }
093        }
094        return replacementBuffer.toString();
095    }
096
097    public String getAdditionalLine() {
098        return null;
099    }
100}