Mercurial > jhg

annotate src/org/tmatesoft/hg/internal/DataAccessInputStream.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 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
545b1d4cc11d Refactor HgBundle.GroupElement (clear experimental mark), resolve few technical debt issues
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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
545b1d4cc11d Refactor HgBundle.GroupElement (clear experimental mark), resolve few technical debt issues
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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 }