Mercurial > hg > truffle
annotate graal/com.oracle.max.base/src/com/sun/max/util/ArrayValueHistory.java @ 3733:e233f5660da4
Added Java files from Maxine project.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Sat, 17 Dec 2011 19:59:18 +0100 |
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children | bc8527f3071c |
rev | line source |
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1 /* |
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2 * Copyright (c) 2009, 2011, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. |
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8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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13 * accompanied this code). |
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14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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18 * |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
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22 */ |
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23 package com.sun.max.util; |
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24 |
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25 import java.util.*; |
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26 |
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27 import com.sun.max.program.*; |
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28 |
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29 /** |
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30 * An array-based recording of the history of a value, with |
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31 * time expressed as the number of generations back from the current generation (0). |
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32 */ |
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33 public final class ArrayValueHistory<E> { |
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34 |
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35 private final ArrayDeque<E> generations; |
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36 private final int limit; |
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37 private int age = -1; |
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38 |
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39 public ArrayValueHistory(int limit) { |
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40 this.generations = new ArrayDeque<E>(); |
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41 this.limit = limit; |
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42 } |
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43 |
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44 public ArrayValueHistory() { |
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45 this (Integer.MAX_VALUE); |
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46 } |
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47 |
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48 /** |
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49 * Adds a new value, which becomes the current generation. |
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50 * The generation of all previously recorded values increases by 1. |
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51 */ |
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52 public void addNew(E newValue) { |
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53 // if (generations.size() > 0) { |
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54 // if (newValue.equals(generations.getFirst())) { |
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55 // if (age >= 0) { |
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56 // age++; |
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57 // } |
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58 // } else { |
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59 // age = 0; |
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60 // } |
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61 // } |
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62 generations.addFirst(newValue); |
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63 if (generations.size() > limit) { |
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64 generations.removeLast(); |
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65 } |
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66 this.age = currentAge(); |
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67 } |
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68 |
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69 /** |
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70 * Replaces the current value in the history. |
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71 * |
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72 * @param newValue value which becomes current |
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73 * @throws ProgramError if no values have been recorded. |
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74 */ |
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75 public void updateCurrent(E newValue) { |
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76 if (generations.size() > 0) { |
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77 if (!newValue.equals(generations.getFirst())) { |
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78 generations.pop(); |
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79 addNew(newValue); |
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80 } |
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81 } else { |
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82 throw ProgramError.unexpected("attempt to update empty history"); |
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83 } |
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84 } |
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85 |
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86 /** |
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87 * Gets the historical value at some generation, 0 is current. |
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88 * |
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89 * @return The value at a specified generation. |
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90 * @throws ProgramError if the index is out of range of the current history |
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91 */ |
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92 public E value(int generation) { |
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93 if (generation == 0 && generations.size() > 0) { |
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94 return generations.getFirst(); |
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95 } |
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96 final Iterator<E> iterator = generations.iterator(); |
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97 int index = 0; |
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98 while (iterator.hasNext()) { |
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99 if (index == generation) { |
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100 return iterator.next(); |
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101 } |
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102 index++; |
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103 } |
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104 throw ProgramError.unexpected("exceeded history"); |
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105 } |
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106 |
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107 /** |
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108 * @return the age, in generations, of the current value, since recording began. |
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109 * 0 if different from immediate predecessor; -1 if no different value ever recorded |
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110 * Comparison uses {@linkplain Object#equals(Object) equals}. |
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111 */ |
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112 public int currentValueAge() { |
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113 return age; |
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114 } |
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115 |
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116 /** |
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117 * @return the maximum number of generations that can be recorded. |
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118 */ |
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119 public int getLimit() { |
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120 return limit; |
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121 } |
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122 |
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123 /** |
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124 * @return the number of generations recorded; initially 0. |
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125 */ |
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126 public int size() { |
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127 return generations.size(); |
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128 } |
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129 |
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130 /** |
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131 * @return iteration of the values recorded in the history, starting with the current |
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132 * generation and proceeding backward in time. |
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133 */ |
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134 public Iterator<E> generations() { |
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135 return generations.iterator(); |
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136 } |
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137 |
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138 /** |
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139 * Computes the age of the current generation, defined to be the number of |
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140 * preceding values that are equal, or -1 if no different value exists. |
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141 */ |
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142 private int currentAge() { |
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143 assert generations.size() > 0; |
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144 final Iterator<E> iterator = generations.iterator(); |
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145 E currentValue = iterator.next(); |
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146 int duplicates = 0; |
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147 while (iterator.hasNext()) { |
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148 if (iterator.next().equals(currentValue)) { |
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149 duplicates++; |
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150 } else { |
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151 return duplicates; |
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152 } |
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153 } |
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154 return -1; |
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155 } |
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156 |
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157 } |