Mercurial > jhg

annotate src/org/tmatesoft/hg/internal/DataAccessInputStream.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 545b1d4cc11d
children
rev   line source
673
545b1d4cc11d Refactor HgBundle.GroupElement (clear experimental mark), resolve few technical debt issues
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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.
545b1d4cc11d Refactor HgBundle.GroupElement (clear experimental mark), resolve few technical debt issues
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7 *
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8 * This program is distributed in the hope that it will be useful,
545b1d4cc11d Refactor HgBundle.GroupElement (clear experimental mark), resolve few technical debt issues
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
545b1d4cc11d Refactor HgBundle.GroupElement (clear experimental mark), resolve few technical debt issues
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
545b1d4cc11d Refactor HgBundle.GroupElement (clear experimental mark), resolve few technical debt issues
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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.IOException;
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20 import java.io.InputStream;
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21
545b1d4cc11d Refactor HgBundle.GroupElement (clear experimental mark), resolve few technical debt issues
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22 /**
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23 * Wrap our internal API into a public one
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24 *
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25 * @author Artem Tikhomirov
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26 * @author TMate Software Ltd.
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27 */
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28 public class DataAccessInputStream extends InputStream {
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29
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30 private final DataAccess da;
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31 private int bytesLeft = -1;
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32
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33 public DataAccessInputStream(DataAccess dataAccess) {
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34 da = dataAccess;
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35 }
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36
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37 @Override
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38 public int available() throws IOException {
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39 initAvailable();
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40 return bytesLeft;
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41 }
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42
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43 @Override
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44 public int read() throws IOException {
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45 initAvailable();
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46 if (bytesLeft == 0) {
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47 return -1;
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48 }
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49 int rv = da.readByte();
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50 bytesLeft--;
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51 return rv;
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52 }
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53
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54 @Override
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55 public int read(byte[] b, int off, int len) throws IOException {
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56 initAvailable();
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57 if (bytesLeft == 0) {
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58 return -1;
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59 }
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60 if (len == 0) {
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61 return 0;
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62 }
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63 int x = Math.min(len, bytesLeft);
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64 da.readBytes(b, off, x);
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65 bytesLeft -= x;
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66 return x;
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67 }
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68
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69
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70 private void initAvailable() throws IOException {
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71 da.reset();
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72 if (bytesLeft == -1) {
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73 bytesLeft = da.length();
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74 }
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75 }
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76 }