Mercurial > hg > truffle

annotate graal/com.oracle.max.base/src/com/sun/max/util/ArrayValueHistory.java @ 4142:bc8527f3071c

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Adjust code base to new level of warnings.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Sun, 18 Dec 2011 05:24:06 +0100
parents e233f5660da4
children
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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<>();
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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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parents:
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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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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
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154 return -1;
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155 }
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parents:
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156
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157 }