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annotate src/org/tmatesoft/hg/internal/FileContentSupplier.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 12a4f60ea972
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rev   line source
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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.FileInputStream;
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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.core.HgIOException;
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26 import org.tmatesoft.hg.core.SessionContext;
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27 import org.tmatesoft.hg.internal.DataSerializer.DataSource;
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28 import org.tmatesoft.hg.repo.HgRepository;
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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 * {@link DataSource} that reads from regular files
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33 *
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34 * @author Artem Tikhomirov
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35 * @author TMate Software Ltd.
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36 */
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37 public class FileContentSupplier implements DataSource {
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38 private final File file;
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39 private final SessionContext ctx;
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40
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41 public FileContentSupplier(HgRepository repo, Path file) {
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42 this(repo, new File(repo.getWorkingDir(), file.toString()));
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43 }
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44
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45 public FileContentSupplier(SessionContext.Source ctxSource, File f) {
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46 ctx = ctxSource.getSessionContext();
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47 file = f;
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48 }
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49
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50 public void serialize(DataSerializer out) throws HgIOException {
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51 FileInputStream fis = null;
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52 try {
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53 fis = new FileInputStream(file);
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54 FileChannel fc = fis.getChannel();
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55 ByteBuffer buffer = ByteBuffer.allocate((int) Math.min(100*1024, fc.size()));
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56 while (fc.read(buffer) != -1) {
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57 buffer.flip();
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58 // #allocate() above ensures backing array
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59 out.write(buffer.array(), 0, buffer.limit());
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60 buffer.clear();
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61 }
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62 } catch (IOException ex) {
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63 throw new HgIOException("Failed to get content of the file", ex, file);
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64 } finally {
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65 new FileUtils(ctx.getLog(), this).closeQuietly(fis);
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66 }
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67 }
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69 public int serializeLength() {
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70 return Internals.ltoi(file.length());
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71 }
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72 }