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annotate src/org/tmatesoft/hg/internal/RevlogCompressor.java @ 709:497e697636fc

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Report merged lines as changed block if possible, not as a sequence of added/deleted blocks. To facilitate access to merge parent lines AddBlock got mergeLineAt() method that reports index of the line in the second parent (if any), while insertedAt() has been changed to report index in the first parent always
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 21 Aug 2013 16:23:27 +0200
parents 6526d8adbc0f
children
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1 /*
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2 * Copyright (c) 2013 TMate Software Ltd
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3 *
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; version 2 of the License.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * For information on how to redistribute this software under
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14 * the terms of a license other than GNU General Public License
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15 * contact TMate Software at support@hg4j.com
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16 */
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17 package org.tmatesoft.hg.internal;
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19 import java.util.zip.Deflater;
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20
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21 import org.tmatesoft.hg.core.HgIOException;
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22 import org.tmatesoft.hg.core.SessionContext;
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23 import org.tmatesoft.hg.repo.HgRuntimeException;
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24 import org.tmatesoft.hg.util.LogFacility.Severity;
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26 /**
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27 *
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28 * @author Artem Tikhomirov
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29 * @author TMate Software Ltd.
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30 */
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31 public class RevlogCompressor {
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32 private final SessionContext ctx;
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33 private final Deflater zip;
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34 private DataSerializer.DataSource sourceData;
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35 private int compressedLen;
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36
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37 public RevlogCompressor(SessionContext sessionCtx) {
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38 ctx = sessionCtx;
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39 zip = new Deflater();
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40 }
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41
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42 public void reset(DataSerializer.DataSource source) {
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43 sourceData = source;
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44 compressedLen = -1;
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45 }
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46
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47 // out stream is not closed!
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48 public int writeCompressedData(DataSerializer out) throws HgIOException, HgRuntimeException {
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49 zip.reset();
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50 DeflaterDataSerializer dds = new DeflaterDataSerializer(out, zip, sourceData.serializeLength());
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51 sourceData.serialize(dds);
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52 dds.finish();
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53 return zip.getTotalOut();
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54 }
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55
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56 public int getCompressedLength() throws HgRuntimeException {
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57 if (compressedLen != -1) {
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58 return compressedLen;
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59 }
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60 Counter counter = new Counter();
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61 try {
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62 compressedLen = writeCompressedData(counter);
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63 assert counter.totalWritten == compressedLen;
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64 return compressedLen;
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65 } catch (HgIOException ex) {
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66 // can't happen provided we write to our stream that does nothing but byte counting
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67 ctx.getLog().dump(getClass(), Severity.Error, ex, "Failed estimating compressed length of revlog data");
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68 return counter.totalWritten; // use best known value so far
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69 }
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70 }
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72 private static class Counter extends DataSerializer {
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73 public int totalWritten = 0;
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74
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75 public void writeByte(byte... values) throws HgIOException {
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76 totalWritten += values.length;
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77 }
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79 public void writeInt(int... values) throws HgIOException {
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80 totalWritten += 4 * values.length;
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81 }
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83 public void write(byte[] data, int offset, int length) throws HgIOException {
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84 totalWritten += length;
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85 }
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86 }
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87 }