/*
* SonarQube
* Copyright (C) 2009-2017 SonarSource SA
* mailto:info AT sonarsource DOT com
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
package org.sonar.core.hash;
import java.security.MessageDigest;
import org.apache.commons.codec.binary.Hex;
import org.apache.commons.codec.digest.DigestUtils;
import static java.nio.charset.StandardCharsets.UTF_8;
/**
* Computes the hash of the source lines of a file by simply added lines of that file one by one in order with
* {@link #addLine(String, boolean)}.
*/
public class SourceHashComputer {
private final MessageDigest md5Digest = DigestUtils.getMd5Digest();
public void addLine(String line, boolean hasNextLine) {
String lineToHash = hasNextLine ? (line + '\n') : line;
this.md5Digest.update(lineToHash.getBytes(UTF_8));
}
public String getHash() {
return Hex.encodeHexString(md5Digest.digest());
}
}