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annotate src/org/tmatesoft/hg/internal/IntVector.java @ 288:b11f6a08f748

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Avoid boxing int values and list resizes on revlog read
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Sat, 10 Sep 2011 00:18:39 +0200
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children a674b8590362
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b11f6a08f748 Avoid boxing int values and list resizes on revlog read
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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1 /*
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2 * Copyright (c) 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.internal;
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18
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19 /**
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20 *
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21 * @author Artem Tikhomirov
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22 * @author TMate Software Ltd.
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23 */
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24 class IntVector {
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25
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26 private int[] data;
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27 private final int increment;
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28 private int count;
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29
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30
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31 public IntVector() {
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32 this(16, -1);
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33 }
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34
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35 // increment == -1: grow by power of two.
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36 // increment == 0: no resize (Exception will be thrown on attempt to add past capacity)
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37 public IntVector(int initialCapacity, int increment) {
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38 data = new int[initialCapacity];
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39 this.increment = increment;
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40 }
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41
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42 public void add(int v) {
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43 if (count == data.length) {
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44 grow();
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45 }
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46 data[count++] = v;
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47 }
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48
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49 public int get(int i) {
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50 if (i < 0 || i >= count) {
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51 throw new IndexOutOfBoundsException(String.format("Index: %d, size: %d", i, count));
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52 }
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53 return data[i];
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54 }
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55
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56 public int size() {
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57 return count;
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58 }
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59
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60 public int[] toArray() {
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61 int[] rv = new int[count];
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62 System.arraycopy(data, 0, rv, 0, count);
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63 return rv;
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64 }
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65
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66 /**
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67 * Use only when this instance won't be used any longer
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68 */
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69 @Experimental
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70 int[] toArray(boolean internalIfSizeMatchCapacity) {
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71 if (count == data.length) {
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72 return data;
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73 }
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74 return toArray();
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75 }
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76
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77 private void grow() {
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78 if (increment == 0) {
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79 // throw specific exception right away
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80 return;
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81 }
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82 int newCapacity = increment < 0 ? data.length << 1 : data.length + increment;
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83 assert newCapacity > 0 && newCapacity != data.length : newCapacity;
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84 int[] newData = new int[newCapacity];
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85 System.arraycopy(data, 0, newData, 0, count);
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86 data = newData;
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87 }
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88 }