Mercurial > hg > truffle
annotate graal/com.oracle.max.base/src/com/sun/max/util/Symbolizer.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.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<>(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 @SafeVarargs |
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87 public static <S extends Symbol> Symbolizer<S> from(Class<S> symbolType, S... symbols) { |
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88 return new ListSymbolizer<>(symbolType, Arrays.asList(symbols)); |
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89 } |
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90 |
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91 @SafeVarargs |
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92 public static <S extends Symbol> Symbolizer<S> fromList(Class<S> symbolType, Iterable< ? extends S> symbols, |
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93 final S... additionalSymbols) { |
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94 final List<S> list = new ArrayList<>(Arrays.asList(additionalSymbols)); |
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95 for (S symbol : symbols) { |
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96 list.add(symbol); |
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97 } |
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98 return new ListSymbolizer<>(symbolType, list); |
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99 } |
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100 |
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101 @SafeVarargs |
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102 public static <S extends Symbol> Symbolizer<S> append(Symbolizer<S> symbolizer, S... symbols) { |
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103 return fromList(symbolizer.type(), symbolizer, symbols); |
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104 } |
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105 |
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106 @SafeVarargs |
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107 public static <S extends Symbol> Symbolizer<S> append(Class<S> symbolType, Symbolizer< ? extends S> symbolizer, |
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108 final S... symbols) { |
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109 return fromList(symbolType, symbolizer, symbols); |
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110 } |
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111 |
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112 public static <S extends Symbol> Symbolizer<S> initialize(Class staticNameFieldClass, Class<S> symbolType) { |
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113 final List<S> list = new ArrayList<>(); |
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114 final List<StaticFieldName> staticFieldNames = StaticFieldName.Static.initialize(staticNameFieldClass); |
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115 for (StaticFieldName staticFieldName : staticFieldNames) { |
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116 if (symbolType.isInstance(staticFieldName)) { |
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117 list.add(symbolType.cast(staticFieldName)); |
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118 } |
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119 } |
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120 return new ListSymbolizer<>(symbolType, list); |
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121 } |
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122 |
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123 public static <S extends Symbol> Symbolizer<S> initialize(Class<S> symbolType) { |
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124 return initialize(symbolType, symbolType); |
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125 } |
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126 |
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127 public static <S extends Symbol> Symbolizer<S> fromSymbolizer(Symbolizer<S> symbolizer, Predicate<S> predicate) { |
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128 if (predicate == null) { |
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129 return symbolizer; |
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130 } |
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131 final List<S> result = new LinkedList<>(); |
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132 for (S element : symbolizer) { |
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133 if (predicate.evaluate(element)) { |
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134 result.add(element); |
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135 } |
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136 } |
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137 List<S> filtered = result; |
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138 return fromList(symbolizer.type(), filtered); |
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139 } |
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140 |
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141 } |
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142 } |