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annotate src/org/tmatesoft/hg/internal/WorkingCopyContent.java @ 681:4f93bbc73b64

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Do not instantiate thousands of small arrays(numerous readInt/readLong calls)
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Sun, 21 Jul 2013 17:48:05 +0200
parents 6526d8adbc0f
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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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18
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19 import java.io.File;
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20 import java.io.IOException;
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21 import java.nio.ByteBuffer;
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22
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23 import org.tmatesoft.hg.core.HgCommitCommand;
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24 import org.tmatesoft.hg.core.HgIOException;
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25 import org.tmatesoft.hg.repo.HgDataFile;
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26 import org.tmatesoft.hg.repo.HgInvalidFileException;
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27 import org.tmatesoft.hg.repo.HgInvalidStateException;
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28 import org.tmatesoft.hg.repo.HgRepository;
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29 import org.tmatesoft.hg.repo.HgRuntimeException;
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30 import org.tmatesoft.hg.util.ByteChannel;
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31 import org.tmatesoft.hg.util.CancelledException;
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32
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33 /**
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34 * Access content of the working copy. The difference with {@link FileContentSupplier} is that this one doesn't need {@link File}
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35 * in the working directory. However, provided this class is used from {@link HgCommitCommand} when "modified" file was detected,
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36 * it's odd to expect no file in the working dir.
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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 WorkingCopyContent implements DataSerializer.DataSource {
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42 private final HgDataFile file;
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43
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44 public WorkingCopyContent(HgDataFile dataFile) {
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45 file = dataFile;
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46 if (!dataFile.exists()) {
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47 throw new IllegalArgumentException();
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48 }
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49 }
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50
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51 public void serialize(final DataSerializer out) throws HgIOException, HgRuntimeException {
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52 final HgIOException failure[] = new HgIOException[1];
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53 try {
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54 // TODO #workingCopy API is very limiting, CancelledException is inconvenient,
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55 // and absence of HgIOException is very uncomfortable
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56 file.workingCopy(new ByteChannel() {
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57
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58 public int write(ByteBuffer buffer) throws IOException {
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59 try {
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60 if (buffer.hasArray()) {
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61 out.write(buffer.array(), buffer.position(), buffer.remaining());
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62 }
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63 int rv = buffer.remaining();
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64 buffer.position(buffer.limit()); // pretend we've consumed the data
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65 return rv;
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66 } catch (HgIOException ex) {
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67 failure[0] = ex;
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68 IOException e = new IOException();
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69 ex.initCause(ex); // XXX Java 1.5
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70 throw e;
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71 }
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72 }
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73 });
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74 } catch (HgInvalidFileException ex) {
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75 if (failure[0] != null) {
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76 throw failure[0];
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77 }
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78 throw new HgIOException("Write failure", ex, new File(file.getRepo().getWorkingDir(), file.getPath().toString()));
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79 } catch (CancelledException ex) {
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80 throw new HgInvalidStateException("Our channel doesn't cancel here");
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81 }
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82 }
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83
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84 public int serializeLength() throws HgRuntimeException {
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85 return file.getLength(HgRepository.WORKING_COPY);
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86 }
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87 }