Mercurial > hg > truffle
annotate graal/com.oracle.max.base/src/com/sun/max/Utils.java @ 4266:e2499e6d8aa7
Merge
author | Lukas Stadler <lukas.stadler@jku.at> |
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date | Wed, 11 Jan 2012 16:31:46 +0100 |
parents | bc8527f3071c |
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rev | line source |
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1 /* |
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2 * Copyright (c) 2010, 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; |
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24 |
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25 import java.io.*; |
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26 import java.util.*; |
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27 |
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28 import com.sun.max.program.*; |
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29 |
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30 /** |
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31 * Miscellaneous utility methods. |
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32 */ |
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33 public final class Utils { |
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34 |
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35 private Utils() { |
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36 } |
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37 |
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38 /** |
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39 * Gets the first element in a list. |
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40 */ |
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41 public static <T> T first(List<T> list) { |
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42 if (list instanceof Queue) { |
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43 Queue queue = (Queue) list; |
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44 Class<T> type = null; |
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45 T t = cast(type, queue.peek()); |
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46 return t; |
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47 } |
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48 return list.get(0); |
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49 } |
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50 |
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51 /** |
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52 * Gets the last element in a list. |
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53 */ |
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54 public static <T> T last(List<T> list) { |
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55 if (list instanceof Deque) { |
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56 Deque deque = (Deque) list; |
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57 Class<T> type = null; |
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58 T t = cast(type, deque.getLast()); |
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59 return t; |
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60 } |
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61 return list.get(list.size() - 1); |
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62 } |
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63 |
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64 /** |
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65 * Creates an array of a generic type. |
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66 * |
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67 * @param <T> the type of the array elements |
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68 * @param length the length of the array to create |
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69 * @return a generic array of type {@code <T>} with a length of {@code length} |
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70 */ |
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71 public static <T> T[] newArray(int length) { |
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72 return cast(new Object[length]); |
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73 } |
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74 |
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75 /** |
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76 * Creates an array of a generic type. |
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77 * |
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78 * @param <T> the type of the array elements |
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79 * @param type explicit class of {@code <T[]>} needed due to javac bug (see {@link #cast(Class, Object)}) |
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80 * @param length the length of the array to create |
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81 * @return a generic array of type {@code <T>} with a length of {@code length} |
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82 */ |
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83 public static <T> T[] newArray(Class<T[]> type, int length) { |
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84 return cast(type, new Object[length]); |
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85 } |
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86 |
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87 /** |
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88 * Adds a set of key-value pairs to a given map. |
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89 * |
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90 * @param <K> |
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91 * @param <V> |
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92 * @param map |
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93 * @param keyValuePairs |
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94 * @return |
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95 */ |
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96 public static <K, V> Map<K, V> addEntries(Map<K, V> map, Object... keyValuePairs) { |
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97 assert keyValuePairs.length % 2 == 0; |
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98 for (int i = 0; i < keyValuePairs.length; i += 2) { |
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99 Object key = keyValuePairs[i]; |
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100 Object value = keyValuePairs[i + 1]; |
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101 Class<K> keyType = null; |
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102 Class<V> valueType = null; |
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103 map.put(cast(keyType, key), cast(valueType, value)); |
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104 } |
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105 return map; |
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106 } |
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107 |
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108 /** |
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109 * Creates an array of a generic type and {@linkplain Arrays#asList(Object...) wraps} it with |
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110 * a fixed-size list. |
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111 * |
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112 * @param <T> the type of the array elements |
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113 * @param length the length of the array to create |
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114 * @return a fixed-size list backed by a new generic array of type {@code <T>} with a length of {@code length} |
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115 */ |
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116 public static <T> List<T> newArrayAsList(int length) { |
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117 Class<T[]> type = null; |
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118 T[] array = newArray(type, length); |
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119 return Arrays.asList(array); |
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120 } |
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121 |
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122 /** |
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123 * Returns the index in {@code list} of the first occurrence identical to {@code value}, or -1 if |
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124 * {@code list} does not contain {@code value}. More formally, returns the lowest index |
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125 * {@code i} such that {@code (list.get(i) == value)}, or -1 if there is no such index. |
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126 */ |
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127 public static int indexOfIdentical(List list, Object value) { |
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128 int i = 0; |
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129 for (Object element : list) { |
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130 if (element == value) { |
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131 return i; |
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132 } |
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133 ++i; |
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134 } |
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135 return -1; |
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136 } |
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137 |
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138 /** |
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139 * Returns the index in {@code array} of the first occurrence identical to {@code value}, or -1 if |
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140 * {@code array} does not contain {@code value}. More formally, returns the lowest index |
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141 * {@code i} such that {@code (array[i] == value)}, or -1 if there is no such index. |
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142 */ |
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143 public static int indexOfIdentical(Object[] array, Object value) { |
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144 for (int i = 0; i < array.length; i++) { |
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145 if (array[i] == value) { |
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146 return i; |
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147 } |
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148 } |
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149 return -1; |
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150 } |
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151 |
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152 /** |
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153 * Statically cast an object to an arbitrary type. The cast is still dynamically checked. |
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154 * |
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155 * This alternate version of {@link #cast(Object)} is required due to bug |
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156 * <a href="http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6302954">6302954</a> in javac. |
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157 * |
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158 * The pattern for calling this method is: |
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159 * <pre> |
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160 * Foo foo = ...; |
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161 * Class<Foo<T>> type = null; |
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162 * Foo<T> genericFoo = uncheckedCast(type, foo); |
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163 * </pre> |
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164 * |
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165 */ |
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166 @SuppressWarnings("unchecked") |
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167 public static <T> T cast(@SuppressWarnings("unused") Class<T> type, Object object) { |
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168 return (T) object; |
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169 } |
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170 |
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171 /** |
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172 * Statically cast an object to an arbitrary type. The cast is still dynamically checked. |
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173 */ |
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174 @SuppressWarnings("unchecked") |
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175 public static <T> T cast(Object object) { |
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176 return (T) object; |
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177 } |
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178 |
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179 /** |
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180 * Concatenates two arrays. |
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181 * |
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182 * @param <T> the type of elements in the source arrays |
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183 * @param head the prefix of the result array |
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184 * @param tail the elements to be concatenated to {@code head} |
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185 * @return the result of concatenating {@code tail} to the end of {@code head} |
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186 */ |
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187 @SafeVarargs |
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188 public static <T> T[] concat(T[] head, T... tail) { |
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189 T[] result = Arrays.copyOf(head, head.length + tail.length); |
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190 System.arraycopy(tail, 0, result, head.length, tail.length); |
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191 return result; |
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192 } |
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193 |
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194 /** |
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195 * Concatenates two arrays. |
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196 * |
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197 * @param <T> the type of elements in the source arrays |
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198 * @param tail the elements to be concatenated to the end of {@code head} |
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199 * @param head the prefix of the result array |
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200 * @return the result of concatenating {@code tail} to the end of {@code head} |
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201 */ |
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202 @SafeVarargs |
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203 public static <T> T[] prepend(T[] tail, T... head) { |
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204 return concat(head, tail); |
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205 } |
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206 |
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207 /** |
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208 * Returns a string representation of the contents of the specified array. |
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209 * If the array contains other arrays as elements, they are converted to |
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210 * strings by the {@link Object#toString} method inherited from |
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211 * <tt>Object</tt>, which describes their <i>identities</i> rather than |
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212 * their contents. |
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213 * |
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214 * @param array the array whose string representation to return |
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215 * @param separator the separator to use |
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216 * @return a string representation of <tt>array</tt> |
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217 * @throws NullPointerException if {@code array} or {@code separator} is null |
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218 */ |
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219 public static <T> String toString(T[] array, String separator) { |
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220 if (array == null || separator == null) { |
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221 throw new NullPointerException(); |
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222 } |
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223 if (array.length == 0) { |
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224 return ""; |
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225 } |
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226 |
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227 final StringBuilder builder = new StringBuilder(); |
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228 builder.append(array[0]); |
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229 |
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230 for (int i = 1; i < array.length; i++) { |
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231 builder.append(separator); |
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232 builder.append(array[i]); |
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233 } |
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234 |
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235 return builder.toString(); |
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236 } |
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237 |
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238 /** |
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239 * Tests a given exception to see if it is an instance of a given exception type, casting and throwing it if so. |
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240 * Otherwise if the exception is an unchecked exception (i.e. an instance of a {@link RuntimeException} or |
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241 * {@link Error}) then it is cast to the appropriate unchecked exception type and thrown. Otherwise, it is wrapped |
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242 * in a {@link ProgramError} and thrown. |
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243 * |
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244 * This method declares a return type simply so that a call to this method can be the expression to a throw |
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245 * instruction. |
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246 */ |
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247 public static <T extends Throwable> T cast(Class<T> exceptionType, Throwable exception) throws T { |
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248 if (exceptionType.isInstance(exception)) { |
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249 throw exceptionType.cast(exception); |
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250 } |
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251 if (exception instanceof Error) { |
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252 throw (Error) exception; |
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253 } |
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254 if (exception instanceof RuntimeException) { |
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255 throw (RuntimeException) exception; |
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256 } |
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257 throw ProgramError.unexpected(exception); |
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258 } |
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259 |
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260 /** |
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261 * Gets the stack trace for a given exception as a string. |
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262 */ |
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263 public static String stackTraceAsString(Throwable throwable) { |
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264 final StringWriter stringWriter = new StringWriter(); |
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265 throwable.printStackTrace(new PrintWriter(stringWriter)); |
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266 return stringWriter.getBuffer().toString(); |
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267 } |
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268 } |