Mercurial > hg4j

annotate cmdline/org/tmatesoft/hg/console/Cat.java @ 338:3cfa4d908fc9

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Add options to control DataAccessProvider, allow to turn off use of file memory mapping in particular to solve potential sharing violation (os file handle gets released on MappedByteByffer being GC'd, not on FileChannel.close())
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 15 Nov 2011 04:47:03 +0100
parents 45dc79e545f5
children
rev   line source
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571e1b2cc3f7 Query file for its parents. Demo of recently added ignore and digest support from within cat cmd
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1 /*
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2 * Copyright (c) 2010-2011 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.console;
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19 import static org.tmatesoft.hg.repo.HgRepository.TIP;
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21 import java.io.IOException;
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22 import java.io.OutputStream;
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23 import java.nio.ByteBuffer;
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24 import java.util.Collections;
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26 import org.tmatesoft.hg.repo.HgDataFile;
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27 import org.tmatesoft.hg.repo.HgRepository;
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28 import org.tmatesoft.hg.util.ByteChannel;
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31 /**
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32 * @author Artem Tikhomirov
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33 * @author TMate Software Ltd.
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34 */
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35 public class Cat {
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37 public static void main(String[] args) throws Exception {
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38 Options cmdLineOpts = Options.parse(args, Collections.<String>emptySet());
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39 HgRepository hgRepo = cmdLineOpts.findRepository();
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40 if (hgRepo.isInvalid()) {
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41 System.err.printf("Can't find repository in: %s\n", hgRepo.getLocation());
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42 return;
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43 }
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44 int rev = cmdLineOpts.getSingleInt(TIP, "-r", "--rev");
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45 OutputStreamChannel out = new OutputStreamChannel(System.out);
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46 for (String fname : cmdLineOpts.getList("")) {
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47 System.out.println(fname);
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48 HgDataFile fn = hgRepo.getFileNode(fname);
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49 if (fn.exists()) {
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50 fn.contentWithFilters(rev, out);
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51 System.out.println();
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52 } else {
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53 System.out.printf("%s not found!\n", fname);
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54 }
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55 }
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56 }
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58 private static class OutputStreamChannel implements ByteChannel {
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60 private final OutputStream stream;
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62 public OutputStreamChannel(OutputStream out) {
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63 stream = out;
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64 }
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66 public int write(ByteBuffer buffer) throws IOException {
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67 int count = buffer.remaining();
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68 while(buffer.hasRemaining()) {
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69 stream.write(buffer.get());
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70 }
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71 return count;
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72 }
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73 }
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74 }