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annotate graal/com.oracle.max.base/src/com/sun/max/util/Symbolizer.java @ 3733:e233f5660da4

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Added Java files from Maxine project.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Sat, 17 Dec 2011 19:59:18 +0100
parents
children bc8527f3071c
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3733
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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.lang.reflect.*;
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26 import java.util.*;
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27
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28 import com.sun.max.lang.*;
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29
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30 /**
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31 * A symbolizer is used to group a set of {@link Symbol symbols}. The members of the
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32 * group can be iterated and the symbol corresponding to a given value can be
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33 * retrieved from the group.
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34 *
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35 * This class is similar to the semantics of {@code enum}s in Java but adds
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36 * the ability to have a set of predefined symbols whose primitive values are not
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37 * necessarily contiguous and starting at 0.
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38 */
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39 public interface Symbolizer<S extends Symbol> extends Iterable<S> {
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40
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41 /**
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42 * @return the concrete type of the symbols in the group
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43 */
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44 Class<S> type();
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45
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46 /**
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47 * Gets the symbol in the group whose primitive value equals {@code value}.
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48 *
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49 * @param value the search key
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50 * @return the found symbol or {@code null} if no symbol is found for {@code value}
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51 */
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52 S fromValue(int value);
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53
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54 int numberOfValues();
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55
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56 public static final class Static {
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57
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58 private Static() {
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59 }
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60
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61 public static boolean hasPackageExternalAccessibleConstructors(Class type) {
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62 final int publicOrProtected = Modifier.PUBLIC | Modifier.PROTECTED;
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63 for (Constructor constructor : type.getConstructors()) {
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64 if ((constructor.getModifiers() & publicOrProtected) != 0) {
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65 return true;
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66 }
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67 }
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68 return false;
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69 }
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70
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71 /**
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72 * Gets a map from name to symbol for all the symbols represented by a given symbolizer.
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73 *
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74 * @param <S> the type of the symbol
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75 * @param symbolizer a set of symbols
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76 * @return a map from symbol name to symbol
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77 */
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78 public static <S extends Symbol> Map<String, S> toSymbolMap(Symbolizer<S> symbolizer) {
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79 final Map<String, S> map = new HashMap<String, S>(symbolizer.numberOfValues());
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80 for (S symbol : symbolizer) {
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81 map.put(symbol.name(), symbol);
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82 }
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83 return map;
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84 }
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85
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86 public static <S extends Symbol> Symbolizer<S> from(Class<S> symbolType, S... symbols) {
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87 return new ListSymbolizer<S>(symbolType, Arrays.asList(symbols));
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88 }
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89
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90 public static <S extends Symbol> Symbolizer<S> fromList(Class<S> symbolType, Iterable< ? extends S> symbols,
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91 final S... additionalSymbols) {
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92 final List<S> list = new ArrayList<S>(Arrays.asList(additionalSymbols));
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93 for (S symbol : symbols) {
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94 list.add(symbol);
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95 }
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96 return new ListSymbolizer<S>(symbolType, list);
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97 }
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98
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99 public static <S extends Symbol> Symbolizer<S> append(Symbolizer<S> symbolizer, S... symbols) {
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100 return fromList(symbolizer.type(), symbolizer, symbols);
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101 }
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102
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103 public static <S extends Symbol> Symbolizer<S> append(Class<S> symbolType, Symbolizer< ? extends S> symbolizer,
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104 final S... symbols) {
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105 return fromList(symbolType, symbolizer, symbols);
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106 }
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107
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108 public static <S extends Symbol> Symbolizer<S> initialize(Class staticNameFieldClass, Class<S> symbolType) {
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109 final List<S> list = new ArrayList<S>();
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110 final List<StaticFieldName> staticFieldNames = StaticFieldName.Static.initialize(staticNameFieldClass);
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111 for (StaticFieldName staticFieldName : staticFieldNames) {
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112 if (symbolType.isInstance(staticFieldName)) {
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113 list.add(symbolType.cast(staticFieldName));
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114 }
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115 }
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116 return new ListSymbolizer<S>(symbolType, list);
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117 }
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118
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119 public static <S extends Symbol> Symbolizer<S> initialize(Class<S> symbolType) {
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120 return initialize(symbolType, symbolType);
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121 }
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122
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123 @SuppressWarnings("unchecked")
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124 public static <S extends Symbol> Symbolizer<S> fromSymbolizer(Symbolizer<S> symbolizer, Predicate<S> predicate) {
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125 if (predicate == null) {
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126 return symbolizer;
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127 }
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128 final List<S> result = new LinkedList<S>();
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129 for (S element : symbolizer) {
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130 if (predicate.evaluate(element)) {
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131 result.add(element);
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132 }
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133 }
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134 List<S> filtered = result;
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135 return fromList(symbolizer.type(), filtered);
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136 }
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137
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138 }
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139 }