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annotate src/org/tmatesoft/hg/internal/WorkingDirFileWriter.java @ 574:88afffd39899

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Improve memory consumption of HgManifest#getFileRevision(): avoid extra byte[] instances
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 16 Apr 2013 14:44:57 +0200
parents becd2a1310a2
children bd5926e24aa3
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1 /*
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2 * Copyright (c) 2012-2013 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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18
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19 import java.io.File;
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20 import java.io.FileOutputStream;
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21 import java.io.IOException;
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22 import java.nio.ByteBuffer;
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23 import java.nio.channels.FileChannel;
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24
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25 import org.tmatesoft.hg.repo.HgDataFile;
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26 import org.tmatesoft.hg.util.ByteChannel;
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27 import org.tmatesoft.hg.util.CancelledException;
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28 import org.tmatesoft.hg.util.LogFacility.Severity;
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29 import org.tmatesoft.hg.util.Path;
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30
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31 /**
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32 *
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33 * @author Artem Tikhomirov
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34 * @author TMate Software Ltd.
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35 */
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36 public class WorkingDirFileWriter implements ByteChannel {
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37
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38
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39 private final Internals hgRepo;
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40 private File dest;
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41 private FileChannel destChannel;
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42 private int totalBytesWritten;
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43
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44 public WorkingDirFileWriter(Internals internalRepo) {
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45 hgRepo = internalRepo;
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46 }
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47
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48 /**
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49 * Information purposes only, to find out trouble location if {@link #processFile(HgDataFile, int)} fails
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50 */
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51 public File getDestinationFile() {
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52 return dest;
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53 }
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54
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55 public void processFile(HgDataFile df, int fileRevIndex) throws IOException {
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56 try {
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57 prepare(df.getPath());
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58 df.contentWithFilters(fileRevIndex, this);
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59 } catch (CancelledException ex) {
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60 hgRepo.getSessionContext().getLog().dump(getClass(), Severity.Error, ex, "Our impl doesn't throw cancellation");
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61 }
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62 finish();
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63 }
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64
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65 public void prepare(Path fname) throws IOException {
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66 String fpath = fname.toString();
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67 dest = new File(hgRepo.getRepo().getWorkingDir(), fpath);
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68 if (fpath.indexOf('/') != -1) {
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69 dest.getParentFile().mkdirs();
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70 }
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71 destChannel = new FileOutputStream(dest).getChannel();
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72 totalBytesWritten = 0;
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73 }
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74
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75 public int write(ByteBuffer buffer) throws IOException, CancelledException {
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76 int written = destChannel.write(buffer);
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77 totalBytesWritten += written;
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78 return written;
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79 }
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80
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81 public void finish() throws IOException {
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82 destChannel.close();
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83 dest = null;
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84 }
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85
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86 public int bytesWritten() {
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87 return totalBytesWritten;
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88 }
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89 }