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annotate graal/com.oracle.max.base/src/com/sun/max/lang/Longs.java @ 4184:fa6b78681c54

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Added copyright check to the gate.
author Doug Simon <doug.simon@oracle.com>
date Tue, 03 Jan 2012 12:37:31 +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.lang;
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24
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25 /**
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26 * Additional methods that one might want in java.lang.Long.
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27 */
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28 public final class Longs {
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29
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30 private Longs() {
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31 }
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32
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33 public static final int SIZE = 8;
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34 public static final int WIDTH = 64;
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35
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36 public static final long INT_MASK = 0xffffffffL;
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37
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38 public static int compare(long greater, long lesser) {
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39 if (greater > lesser) {
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40 return 1;
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41 }
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42 if (greater == lesser) {
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43 return 0;
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44 }
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45 return -1;
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46 }
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47
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48 public static int numberOfEffectiveSignedBits(long signed) {
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49 if (signed >= 0) {
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50 return 65 - Long.numberOfLeadingZeros(signed);
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51 }
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52 return 65 - Long.numberOfLeadingZeros(~signed);
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53 }
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54
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55 public static int numberOfEffectiveUnsignedBits(long unsigned) {
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56 return 64 - Long.numberOfLeadingZeros(unsigned);
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57 }
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58
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59 public static byte getByte(long value, int index) {
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60 return (byte) ((value >> (index * 8)) & 0xffL);
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61 }
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62
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63 public static String toPaddedHexString(long n, char pad) {
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64 final String s = Long.toHexString(n);
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65 return Strings.times(pad, 16 - s.length()) + s;
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66 }
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67
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68 /**
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69 * Determines if a given number is zero or a power of two.
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70 */
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71 public static boolean isPowerOfTwoOrZero(long n) {
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72 return Long.lowestOneBit(n) == n;
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73 }
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74
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75 public static final long K = 1024;
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76 public static final long M = K * K;
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77 public static final long G = M * K;
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78 public static final long T = G * K;
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79 public static final long P = T * K;
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80
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81 /**
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82 * Converts a positive number to a string using unit suffixes to reduce the
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83 * number of digits to three or less using base 2 for sizes.
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84 *
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85 * @param number the number to convert to a string
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86 * @param onlyPowerOfTwo if {@code true}, then a unit suffix is only used if {@code number} is an exact power of 2
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87 */
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88 public static String toUnitsString(long number, boolean onlyPowerOfTwo) {
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89 if (number < 0) {
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90 throw new IllegalArgumentException(String.valueOf(number));
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91 }
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92 if (onlyPowerOfTwo && !isPowerOfTwoOrZero(number)) {
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93 return String.valueOf(number);
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94 }
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95 if (number >= P) {
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96 return number / P + "P";
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97 }
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98 if (number >= T) {
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99 return number / T + "T";
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100 }
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101 if (number >= G) {
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102 return number / G + "G";
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103 }
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104 if (number >= M) {
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105 return number / M + "M";
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106 }
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107 if (number >= K) {
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108 return number / K + "K";
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109 }
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110 return Long.toString(number);
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111 }
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112
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113 /**
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114 * Parse a size specification nX, where X := {K, M, G, T, P, k, m, g, t, p}.
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115 *
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116 * @param value a string containing a long number that can be parsed by {@link Long#parseLong(String)} followed by
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117 * an optional scaling character
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118 * @return the scaled value
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119 * @throws NumberFormatException if {@code value} does not contain a parsable {@code long} or has an invalid scale
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120 * suffix
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121 */
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122 public static long parseScaledValue(String value) throws NumberFormatException {
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123 char lastChar = value.charAt(value.length() - 1);
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124 if (!Character.isDigit(lastChar)) {
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125 long result = Long.parseLong(value.substring(0, value.length() - 1));
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126 switch (lastChar) {
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127 case 'K':
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128 case 'k': {
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129 return result * Longs.K;
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130 }
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131 case 'M':
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132 case 'm': {
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133 return result * Longs.M;
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134 }
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135 case 'G':
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136 case 'g': {
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137 return result * Longs.G;
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138 }
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139 case 'T':
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140 case 't': {
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141 return result * Longs.T;
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142 }
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143 case 'P':
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144 case 'p': {
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145 return result * Longs.P;
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146 }
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147 default: {
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148 throw new NumberFormatException("Number with unknown scale suffix: " + value);
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149 }
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150 }
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151 }
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152 return Long.parseLong(value);
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153 }
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154 }