org.sonar.batch.issue.tracking.FileHashes.java Source code

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Here is the source code for org.sonar.batch.issue.tracking.FileHashes.java

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/*
 * SonarQube
 * Copyright (C) 2009-2016 SonarSource SA
 * mailto:contact 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.batch.issue.tracking;

import org.sonar.api.batch.fs.internal.FileMetadata;
import org.sonar.api.batch.fs.internal.FileMetadata.LineHashConsumer;

import com.google.common.collect.LinkedHashMultimap;
import com.google.common.collect.Multimap;
import org.apache.commons.codec.binary.Hex;
import org.apache.commons.lang.ObjectUtils;
import org.sonar.api.batch.fs.internal.DefaultInputFile;

import javax.annotation.Nullable;

import java.util.Collection;

/**
 * Wraps a {@link Sequence} to assign hash codes to elements.
 */
public final class FileHashes {

    private final String[] hashes;
    private final Multimap<String, Integer> linesByHash;

    private FileHashes(String[] hashes, Multimap<String, Integer> linesByHash) {
        this.hashes = hashes;
        this.linesByHash = linesByHash;
    }

    public static FileHashes create(String[] hashes) {
        int size = hashes.length;
        Multimap<String, Integer> linesByHash = LinkedHashMultimap.create();
        for (int i = 0; i < size; i++) {
            // indices in array are shifted one line before
            linesByHash.put(hashes[i], i + 1);
        }
        return new FileHashes(hashes, linesByHash);
    }

    public static FileHashes create(DefaultInputFile f) {
        final byte[][] hashes = new byte[f.lines()][];
        FileMetadata.computeLineHashesForIssueTracking(f, new LineHashConsumer() {

            @Override
            public void consume(int lineIdx, @Nullable byte[] hash) {
                hashes[lineIdx - 1] = hash;
            }
        });

        int size = hashes.length;
        Multimap<String, Integer> linesByHash = LinkedHashMultimap.create();
        String[] hexHashes = new String[size];
        for (int i = 0; i < size; i++) {
            String hash = hashes[i] != null ? Hex.encodeHexString(hashes[i]) : "";
            hexHashes[i] = hash;
            // indices in array are shifted one line before
            linesByHash.put(hash, i + 1);
        }
        return new FileHashes(hexHashes, linesByHash);
    }

    public int length() {
        return hashes.length;
    }

    public Collection<Integer> getLinesForHash(String hash) {
        return linesByHash.get(hash);
    }

    public String[] hashes() {
        return hashes;
    }

    public String getHash(int line) {
        // indices in array are shifted one line before
        return (String) ObjectUtils.defaultIfNull(hashes[line - 1], "");
    }
}