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annotate graal/com.oracle.max.base/src/com/sun/max/Utils.java @ 4142:bc8527f3071c

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Adjust code base to new level of warnings.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Sun, 18 Dec 2011 05:24:06 +0100
parents e233f5660da4
children
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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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diff changeset
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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diff changeset
228 builder.append(array[0]);
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229
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diff changeset
230 for (int i = 1; i < array.length; i++) {
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diff changeset
231 builder.append(separator);
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diff changeset
232 builder.append(array[i]);
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diff changeset
233 }
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234
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diff changeset
235 return builder.toString();
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
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diff changeset
236 }
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237
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parents:
diff changeset
238 /**
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diff changeset
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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diff changeset
241 * {@link Error}) then it is cast to the appropriate unchecked exception type and thrown. Otherwise, it is wrapped
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diff changeset
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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diff changeset
246 */
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diff changeset
247 public static <T extends Throwable> T cast(Class<T> exceptionType, Throwable exception) throws T {
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diff changeset
248 if (exceptionType.isInstance(exception)) {
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diff changeset
249 throw exceptionType.cast(exception);
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250 }
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diff changeset
251 if (exception instanceof Error) {
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diff changeset
252 throw (Error) exception;
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253 }
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diff changeset
254 if (exception instanceof RuntimeException) {
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diff changeset
255 throw (RuntimeException) exception;
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diff changeset
256 }
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diff changeset
257 throw ProgramError.unexpected(exception);
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diff changeset
258 }
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diff changeset
259
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
260 /**
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
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diff changeset
261 * Gets the stack trace for a given exception as a string.
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
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diff changeset
262 */
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diff changeset
263 public static String stackTraceAsString(Throwable throwable) {
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
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diff changeset
264 final StringWriter stringWriter = new StringWriter();
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diff changeset
265 throwable.printStackTrace(new PrintWriter(stringWriter));
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diff changeset
266 return stringWriter.getBuffer().toString();
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267 }
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268 }