Mercurial > hg4j

annotate src/org/tmatesoft/hg/internal/WorkingCopyContent.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
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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 }