Mercurial > hg > truffle
annotate graal/com.oracle.max.base/src/com/sun/max/util/Enumerator.java @ 4231:d713eaf4d288
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author | Christian Wimmer <Christian.Wimmer@Oracle.com> |
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date | Thu, 05 Jan 2012 16:09:47 -0800 |
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1 /* |
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2 * Copyright (c) 2007, 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.*; |
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28 |
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29 /** |
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30 * @see Enumerable |
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31 */ |
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32 public class Enumerator<E extends Enum<E> & Enumerable<E>> |
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33 implements Symbolizer<E> { |
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34 |
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35 private final Class<E> type; |
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36 private final E[] ordinalMap; |
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37 private final E[] valueMap; |
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38 private final int lowestValue; |
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39 |
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40 public Enumerator(Class<E> type) { |
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41 this.type = type; |
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42 ordinalMap = type.getEnumConstants(); |
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43 |
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44 int lowValue = 0; |
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45 int highestValue = ordinalMap.length - 1; |
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46 boolean valuesAreSameAsOrdinals = true; |
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47 for (E e : ordinalMap) { |
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48 final int value = e.value(); |
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49 if (value != e.ordinal()) { |
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50 valuesAreSameAsOrdinals = false; |
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51 } |
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52 if (value < lowValue) { |
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53 lowValue = value; |
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54 } else if (value > highestValue) { |
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55 highestValue = value; |
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56 } |
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57 } |
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58 |
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59 if (valuesAreSameAsOrdinals) { |
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60 this.lowestValue = 0; |
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61 valueMap = ordinalMap; |
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62 } else { |
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63 final int valueMapLength = (highestValue - lowValue) + 1; |
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64 final Class<E[]> arrayType = null; |
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65 this.lowestValue = lowValue; |
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66 valueMap = Utils.cast(arrayType, new Enum[valueMapLength]); |
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67 for (E e : ordinalMap) { |
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68 final int value = e.value(); |
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69 // The enumerable with the lowest ordinal is stored in the value map: |
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70 if (valueMap[value] == null) { |
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71 valueMap[value] = e; |
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72 } |
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73 } |
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74 } |
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75 } |
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76 |
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77 public Class<E> type() { |
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78 return type; |
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79 } |
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80 |
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81 public int numberOfValues() { |
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82 return ordinalMap.length; |
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83 } |
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84 |
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85 /** |
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86 * Adds all the enumerable constants in this enumerator to a given set. |
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87 * |
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88 * @param set |
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89 * the set to which the enumerable constants are to be added |
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90 */ |
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91 public void addAll(Set<E> set) { |
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92 for (E e : this) { |
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93 set.add(e); |
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94 } |
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95 } |
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96 |
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97 public int size() { |
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98 return ordinalMap.length; |
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99 } |
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100 |
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101 public Iterator<E> iterator() { |
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102 return Arrays.asList(ordinalMap).iterator(); |
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103 } |
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104 |
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105 /** |
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106 * Gets the enumerable constant denoted by a given ordinal. Note that this differs from {@link #fromValue(int)} in |
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107 * that the latter retrieves an enumerable constant matching a given {@linkplain Enumerable#value() value}. An |
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108 * enumerable's value is not necessarily the same as its ordinal. |
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109 * |
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110 * @throws IndexOutOfBoundsException |
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111 * if {@code 0 < ordinal || ordinal >= length()} |
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112 */ |
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113 public E get(int ordinal) throws IndexOutOfBoundsException { |
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114 return ordinalMap[ordinal]; |
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115 } |
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116 |
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117 /** |
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118 * Gets the enumerable constant matching a given value. That is, this method gets an enumerable from this enumerator |
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119 * whose {@linkplain Enumerable#value() value} is equal to {@code value}. Note that the given value may not match |
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120 * any enumerable in this enumerator in which case null is returned. Additionally, there may be more than one |
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121 * enumerable with a matching value in which case the matching enumerable with the lowest |
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122 * {@linkplain Enum#ordinal() ordinal} is returned. |
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123 */ |
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124 public E fromValue(int value) { |
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125 final int index = value - lowestValue; |
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126 if (index >= 0 && index < valueMap.length) { |
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127 return valueMap[index]; |
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128 } |
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129 return null; |
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130 } |
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131 } |