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annotate graal/com.oracle.max.base/src/com/sun/max/util/Enumerator.java @ 4222:8e2985cdaaa5

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Renaming of VMExits and VMEntries part 3.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Wed, 04 Jan 2012 21:13:44 +0100
parents e233f5660da4
children
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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 }