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annotate src/org/tmatesoft/hg/internal/ManifestEntryBuilder.java @ 656:a937e63b6e02

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Performance: rebuild information about branches takes too long (my improvement: 3 times, 11-15 s to less than 4 sec)
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 04 Jul 2013 18:40:03 +0200
parents 7c0d2ce340b8
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1 /*
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2 * Copyright (c) 2012 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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18
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19 import java.io.ByteArrayOutputStream;
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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.Nodeid;
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23 import org.tmatesoft.hg.internal.DataSerializer.DataSource;
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24
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25 /**
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26 * Create binary manifest entry ready to write down into 00manifest.i
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27 * <p>Usage:
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28 * <pre>
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29 * ManifestEntryBuilder mb = new ManifestEntryBuilder();
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30 * mb.reset().add("file1", file1.getRevision(r1));
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31 * mb.add("file2", file2.getRevision(r2));
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32 * byte[] manifestRecordData = mb.build();
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33 * byte[] manifestRevlogHeader = buildRevlogHeader(..., sha1(parents, manifestRecordData), manifestRecordData.length);
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34 * manifestIndexOutputStream.write(manifestRevlogHeader);
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35 * manifestIndexOutputStream.write(manifestRecordData);
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36 * </pre>
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37 *
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38 * @author Artem Tikhomirov
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39 * @author TMate Software Ltd.
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40 */
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41 public class ManifestEntryBuilder implements DataSource {
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42 private final ByteArrayOutputStream buffer = new ByteArrayOutputStream();
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43 private final EncodingHelper encHelper;
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44
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45 public ManifestEntryBuilder(EncodingHelper encodingHelper) {
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46 encHelper = encodingHelper;
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47 }
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49 public ManifestEntryBuilder reset() {
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50 buffer.reset();
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51 return this;
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52 }
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53 public ManifestEntryBuilder add(String fname, Nodeid revision) {
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54 byte[] b = encHelper.toManifest(fname);
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55 buffer.write(b, 0, b.length);
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56 buffer.write('\0');
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57 b = revision.toString().getBytes();
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58 buffer.write(b, 0, b.length);
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59 buffer.write('\n');
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60 return this;
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61 }
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63 public byte[] build() {
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64 return buffer.toByteArray();
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65 }
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66
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67 public void serialize(DataSerializer out) throws HgIOException {
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68 byte[] r = build();
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69 out.write(r, 0 , r.length);
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70 }
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71
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72 public int serializeLength() {
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73 return buffer.size();
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74 }
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75
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76 }