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annotate src/org/tmatesoft/hg/internal/ByteVector.java @ 574:88afffd39899

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Improve memory consumption of HgManifest#getFileRevision(): avoid extra byte[] instances
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 16 Apr 2013 14:44:57 +0200
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children a62079bc422b
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574
88afffd39899 Improve memory consumption of HgManifest#getFileRevision(): avoid extra byte[] instances
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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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.ByteArrayOutputStream;
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20
88afffd39899 Improve memory consumption of HgManifest#getFileRevision(): avoid extra byte[] instances
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21 /**
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22 * Alternative to {@link ByteArrayOutputStream}, with extra operation that prevent extra byte[] instances
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23 *
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24 * @author Artem Tikhomirov
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25 * @author TMate Software Ltd.
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26 */
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27 public class ByteVector {
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28 private byte[] data;
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29 private int count;
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30 private final int increment;
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31
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32
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33 public ByteVector(int initialSize, int increment) {
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34 data = new byte[initialSize];
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35 this.increment = increment;
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36 }
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37
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38 public void add(int b) {
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39 if (count == data.length) {
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40 byte[] newData = new byte[count + increment];
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41 System.arraycopy(data, 0, newData, 0, count);
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42 data = newData;
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43 }
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44 data[count++] = (byte) b;
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45 }
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46
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47 public int size() {
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48 return count;
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49 }
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50
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51 public void clear() {
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52 count = 0;
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53 }
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54
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55 public boolean equalsTo(byte[] array) {
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56 if (array == null || array.length != count) {
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57 return false;
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58 }
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59 for (int i = 0; i < count; i++) {
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60 if (data[i] != array[i]) {
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61 return false;
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62 }
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63 }
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64 return true;
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65 }
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66
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67 /**
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68 * Copies content of this vector into destination array.
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69 * @param destination array, greater or equal to {@link #size()} of the vector
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70 */
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71 public void copyTo(byte[] destination) {
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72 if (destination == null || destination.length < count) {
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73 throw new IllegalArgumentException();
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74 }
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75 System.arraycopy(data, 0, destination, 0, count);
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76 }
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77
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78 public byte[] toByteArray() {
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79 byte[] rv = new byte[count];
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80 copyTo(rv);
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81 return rv;
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82 }
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83 }