org.sonar.plugins.core.issue.tracking.SourceChecksum.java Source code

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Here is the source code for org.sonar.plugins.core.issue.tracking.SourceChecksum.java

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/*
 * SonarQube, open source software quality management tool.
 * Copyright (C) 2008-2013 SonarSource
 * mailto:contact AT sonarsource DOT com
 *
 * SonarQube 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.
 *
 * SonarQube 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.plugins.core.issue.tracking;

import com.google.common.collect.Lists;
import org.apache.commons.codec.digest.DigestUtils;
import org.apache.commons.lang.StringUtils;

import javax.annotation.Nullable;
import java.util.List;

public final class SourceChecksum {

    private static final String SPACE_CHARS = "\t\n\r ";

    private SourceChecksum() {
        // only static methods
    }

    /**
     * @param line line number (first line has number 1)
     * @return checksum or null if checksum not exists for line
     */
    public static String getChecksumForLine(List<String> checksums, @Nullable Integer line) {
        if (line == null || line < 1 || line > checksums.size()) {
            return null;
        }
        return checksums.get(line - 1);
    }

    public static List<String> lineChecksumsOfFile(String file) {
        List<String> result = Lists.newArrayList();
        if (file != null) {
            String[] lines = file.split("\r?\n|\r", -1);
            for (String line : lines) {
                result.add(lineChecksum(line));
            }
        }
        return result;
    }

    public static String lineChecksum(String line) {
        String reducedLine = StringUtils.replaceChars(line, SPACE_CHARS, "");
        return DigestUtils.md5Hex(reducedLine);
    }

}