001/*
002 * Sonar, open source software quality management tool.
003 * Copyright (C) 2008-2012 SonarSource
004 * mailto:contact AT sonarsource DOT com
005 *
006 * Sonar is free software; you can redistribute it and/or
007 * modify it under the terms of the GNU Lesser General Public
008 * License as published by the Free Software Foundation; either
009 * version 3 of the License, or (at your option) any later version.
010 *
011 * Sonar is distributed in the hope that it will be useful,
012 * but WITHOUT ANY WARRANTY; without even the implied warranty of
013 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014 * Lesser General Public License for more details.
015 *
016 * You should have received a copy of the GNU Lesser General Public
017 * License along with Sonar; if not, write to the Free Software
018 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
019 */
020package org.sonar.plugins.core.timemachine;
021
022import com.google.common.collect.Lists;
023import org.apache.commons.codec.digest.DigestUtils;
024import org.apache.commons.lang.StringUtils;
025
026import java.util.List;
027
028public final class SourceChecksum {
029
030  private static final String SPACE_CHARS = "\t\n\r ";
031
032  private SourceChecksum() {
033    // only static methods
034  }
035
036  /**
037   * @param line line number (first line has number 1)
038   * @return checksum or null if checksum not exists for line
039   */
040  public static String getChecksumForLine(List<String> checksums, Integer line) {
041    if (line == null || line < 1 || line > checksums.size()) {
042      return null;
043    }
044    return checksums.get(line - 1);
045  }
046
047  public static List<String> lineChecksumsOfFile(String file) {
048    List<String> result = Lists.newArrayList();
049    if (file != null) {
050      String[] lines = file.split("\r?\n|\r", -1);
051      for (String line : lines) {
052        result.add(lineChecksum(line));
053      }
054    }
055    return result;
056  }
057
058  public static String lineChecksum(String line) {
059    String reducedLine = StringUtils.replaceChars(line, SPACE_CHARS, "");
060    return DigestUtils.md5Hex(reducedLine);
061  }
062
063}