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}