Mercurial > hg4j
annotate src/org/tmatesoft/hg/internal/IntVector.java @ 558:154718ae23ed
Annotate: refactor/reuse range handling code
author | Artem Tikhomirov <tikhomirov.artem@gmail.com> |
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date | Mon, 25 Feb 2013 18:41:44 +0100 |
parents | 45751456b471 |
children | d3c71498919c |
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1 /* |
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2 * Copyright (c) 2011-2013 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 /** |
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20 * Vector of primitive values |
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21 * |
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22 * @author Artem Tikhomirov |
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23 * @author TMate Software Ltd. |
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24 */ |
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25 public class IntVector { |
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26 |
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27 private int[] data; |
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28 private final int increment; |
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29 private int count; |
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30 |
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31 |
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32 public IntVector() { |
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33 this(16, -1); |
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34 } |
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35 |
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36 // increment == -1: grow by power of two. |
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37 // increment == 0: no resize (Exception will be thrown on attempt to add past capacity) |
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38 public IntVector(int initialCapacity, int increment) { |
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39 data = new int[initialCapacity]; |
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40 this.increment = increment; |
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41 } |
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42 |
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43 public void add(int v) { |
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44 if (count == data.length) { |
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45 grow(0); |
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46 } |
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47 data[count++] = v; |
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48 } |
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49 |
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50 public void add(int... values) { |
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51 if (count + values.length > data.length) { |
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52 grow(count + values.length); |
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53 } |
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54 for (int v : values) { |
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55 data[count++] = v; |
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56 } |
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57 } |
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58 |
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59 public int get(int i) { |
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60 if (i < 0 || i >= count) { |
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61 throw new IndexOutOfBoundsException(String.format("Index: %d, size: %d", i, count)); |
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62 } |
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63 return data[i]; |
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64 } |
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65 |
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66 public void set(int i, int v) { |
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67 if (i < 0 || i >= count) { |
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68 throw new IndexOutOfBoundsException(String.format("Index: %d, size: %d", i, count)); |
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69 } |
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70 data[i] = v; |
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71 } |
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72 |
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73 public int size() { |
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74 return count; |
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75 } |
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76 |
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77 public boolean isEmpty() { |
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78 return count == 0; |
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79 } |
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80 |
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81 public void clear() { |
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82 count = 0; |
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83 } |
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84 |
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85 public void trimToSize() { |
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86 data = toArray(true); |
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87 } |
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88 |
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89 |
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90 public int[] toArray() { |
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91 int[] rv = new int[count]; |
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92 System.arraycopy(data, 0, rv, 0, count); |
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93 return rv; |
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94 } |
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95 |
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96 public void reverse() { |
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97 for (int a = 0, b = count-1; a < b; a++, b--) { |
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98 int t = data[b]; |
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99 data[b] = data[a]; |
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100 data[a] = t; |
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101 } |
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102 } |
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103 |
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104 @Override |
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105 public String toString() { |
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106 return String.format("%s[%d]", IntVector.class.getSimpleName(), size()); |
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107 } |
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108 |
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109 /** |
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110 * Use only when this instance won't be used any longer |
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111 */ |
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112 @Experimental |
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113 int[] toArray(boolean internalIfSizeMatchCapacity) { |
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114 if (count == data.length) { |
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115 return data; |
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116 } |
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117 return toArray(); |
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118 } |
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119 |
551
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120 private void grow(int newCapacityHint) { |
288
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121 if (increment == 0) { |
329
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122 throw new UnsupportedOperationException("This vector is not allowed to expand"); |
288
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123 } |
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124 int newCapacity = increment < 0 ? data.length << 1 : data.length + increment; |
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125 if (newCapacityHint > 0 && newCapacity < newCapacityHint) { |
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126 newCapacity = newCapacityHint; |
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127 } |
288
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128 assert newCapacity > 0 && newCapacity != data.length : newCapacity; |
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129 int[] newData = new int[newCapacity]; |
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130 System.arraycopy(data, 0, newData, 0, count); |
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131 data = newData; |
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132 } |
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133 } |