11d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert/* 21d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Copyright (C) 2011 The Guava Authors 31d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * 41d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except 51d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * in compliance with the License. You may obtain a copy of the License at 61d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * 71d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * http://www.apache.org/licenses/LICENSE-2.0 81d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * 91d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Unless required by applicable law or agreed to in writing, software distributed under the 101d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either 111d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * express or implied. See the License for the specific language governing permissions and 121d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * limitations under the License. 131d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert */ 141d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 151d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertpackage com.google.common.primitives; 161d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 171d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport static com.google.common.base.Preconditions.checkArgument; 181d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport static com.google.common.base.Preconditions.checkNotNull; 191d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 201d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport java.util.Arrays; 211d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport java.util.Comparator; 221d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 231d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport com.google.common.annotations.Beta; 241d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport com.google.common.annotations.GwtCompatible; 251d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 261d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert/** 271d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Static utility methods pertaining to {@code int} primitives that interpret values as 281d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * <i>unsigned</i> (that is, any negative value {@code x} is treated as the positive value 291d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * {@code 2^32 + x}). The methods for which signedness is not an issue are in {@link Ints}, as well 301d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * as signed versions of methods for which signedness is an issue. 311d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * 321d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * <p>In addition, this class provides several static methods for converting an {@code int} to a 331d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * {@code String} and a {@code String} to an {@code int} that treat the {@code int} as an unsigned 341d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * number. 351d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * 361d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * <p>Users of these utilities must be <i>extremely careful</i> not to mix up signed and unsigned 371d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * {@code int} values. When possible, it is recommended that the {@link UnsignedInteger} wrapper 381d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * class be used, at a small efficiency penalty, to enforce the distinction in the type system. 391d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * 401d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * @author Louis Wasserman 411d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * @since 11.0 421d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert */ 431d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert@Beta 441d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert@GwtCompatible 451d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertpublic final class UnsignedInts { 461d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert static final long INT_MASK = 0xffffffffL; 471d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 481d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert private UnsignedInts() {} 491d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 501d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert static int flip(int value) { 511d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return value ^ Integer.MIN_VALUE; 521d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 531d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 541d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert /** 551d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Compares the two specified {@code int} values, treating them as unsigned values between 561d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * {@code 0} and {@code 2^32 - 1} inclusive. 571d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * 581d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * @param a the first unsigned {@code int} to compare 591d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * @param b the second unsigned {@code int} to compare 601d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * @return a negative value if {@code a} is less than {@code b}; a positive value if {@code a} is 611d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * greater than {@code b}; or zero if they are equal 621d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert */ 631d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert public static int compare(int a, int b) { 641d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return Ints.compare(flip(a), flip(b)); 651d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 661d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 671d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert /** 681d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Returns the value of the given {@code int} as a {@code long}, when treated as unsigned. 691d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert */ 701d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert public static long toLong(int value) { 711d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return value & INT_MASK; 721d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 731d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 741d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert /** 751d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Returns the least value present in {@code array}, treating values as unsigned. 761d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * 771d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * @param array a <i>nonempty</i> array of unsigned {@code int} values 781d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * @return the value present in {@code array} that is less than or equal to every other value in 791d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * the array according to {@link #compare} 801d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * @throws IllegalArgumentException if {@code array} is empty 811d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert */ 821d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert public static int min(int... array) { 831d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert checkArgument(array.length > 0); 841d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert int min = flip(array[0]); 851d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert for (int i = 1; i < array.length; i++) { 861d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert int next = flip(array[i]); 871d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert if (next < min) { 881d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert min = next; 891d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 901d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 911d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return flip(min); 921d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 931d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 941d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert /** 951d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Returns the greatest value present in {@code array}, treating values as unsigned. 961d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * 971d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * @param array a <i>nonempty</i> array of unsigned {@code int} values 981d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * @return the value present in {@code array} that is greater than or equal to every other value 991d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * in the array according to {@link #compare} 1001d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * @throws IllegalArgumentException if {@code array} is empty 1011d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert */ 1021d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert public static int max(int... array) { 1031d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert checkArgument(array.length > 0); 1041d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert int max = flip(array[0]); 1051d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert for (int i = 1; i < array.length; i++) { 1061d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert int next = flip(array[i]); 1071d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert if (next > max) { 1081d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert max = next; 1091d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 1101d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 1111d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return flip(max); 1121d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 1131d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 1141d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert /** 1151d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Returns a string containing the supplied unsigned {@code int} values separated by 1161d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * {@code separator}. For example, {@code join("-", 1, 2, 3)} returns the string {@code "1-2-3"}. 1171d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * 1181d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * @param separator the text that should appear between consecutive values in the resulting 1191d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * string (but not at the start or end) 1201d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * @param array an array of unsigned {@code int} values, possibly empty 1211d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert */ 1221d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert public static String join(String separator, int... array) { 1231d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert checkNotNull(separator); 1241d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert if (array.length == 0) { 1251d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return ""; 1261d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 1271d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 1281d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert // For pre-sizing a builder, just get the right order of magnitude 1291d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert StringBuilder builder = new StringBuilder(array.length * 5); 1301d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert builder.append(array[0]); 1311d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert for (int i = 1; i < array.length; i++) { 1321d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert builder.append(separator).append(toString(array[i])); 1331d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 1341d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return builder.toString(); 1351d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 1361d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 1371d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert /** 1381d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Returns a comparator that compares two arrays of unsigned {@code int} values lexicographically. 1391d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * That is, it compares, using {@link #compare(int, int)}), the first pair of values that follow 1401d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * any common prefix, or when one array is a prefix of the other, treats the shorter array as the 1411d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * lesser. For example, {@code [] < [1] < [1, 2] < [2] < [1 << 31]}. 1421d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * 1431d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * <p>The returned comparator is inconsistent with {@link Object#equals(Object)} (since arrays 1441d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * support only identity equality), but it is consistent with {@link Arrays#equals(int[], int[])}. 1451d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * 1461d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * @see <a href="http://en.wikipedia.org/wiki/Lexicographical_order"> Lexicographical order 1471d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * article at Wikipedia</a> 1481d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert */ 1491d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert public static Comparator<int[]> lexicographicalComparator() { 1501d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return LexicographicalComparator.INSTANCE; 1511d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 1521d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 1531d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert enum LexicographicalComparator implements Comparator<int[]> { 1541d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert INSTANCE; 1551d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 1561d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert @Override 1571d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert public int compare(int[] left, int[] right) { 1581d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert int minLength = Math.min(left.length, right.length); 1591d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert for (int i = 0; i < minLength; i++) { 1601d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert if (left[i] != right[i]) { 1611d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return UnsignedInts.compare(left[i], right[i]); 1621d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 1631d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 1641d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return left.length - right.length; 1651d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 1661d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 1671d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 1681d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert /** 1691d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Returns dividend / divisor, where the dividend and divisor are treated as unsigned 32-bit 1701d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * quantities. 1711d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * 1721d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * @param dividend the dividend (numerator) 1731d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * @param divisor the divisor (denominator) 1741d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * @throws ArithmeticException if divisor is 0 1751d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert */ 1761d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert public static int divide(int dividend, int divisor) { 1771d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return (int) (toLong(dividend) / toLong(divisor)); 1781d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 1791d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 1801d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert /** 1811d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Returns dividend % divisor, where the dividend and divisor are treated as unsigned 32-bit 1821d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * quantities. 1831d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * 1841d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * @param dividend the dividend (numerator) 1851d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * @param divisor the divisor (denominator) 1861d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * @throws ArithmeticException if divisor is 0 1871d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert */ 1881d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert public static int remainder(int dividend, int divisor) { 1891d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return (int) (toLong(dividend) % toLong(divisor)); 1901d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 1911d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 1921d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert /** 1931d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Returns the unsigned {@code int} value represented by the given decimal string. 1941d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * 1951d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * @throws NumberFormatException if the string does not contain a valid unsigned integer, or if 1961d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * the value represented is too large to fit in an unsigned {@code int}. 1971d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * @throws NullPointerException if {@code s} is null 1981d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert */ 1991d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert public static int parseUnsignedInt(String s) { 2001d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return parseUnsignedInt(s, 10); 2011d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 2021d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 2031d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert /** 2041d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Returns the unsigned {@code int} value represented by a string with the given radix. 2051d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * 2061d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * @param string the string containing the unsigned integer representation to be parsed. 2071d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * @param radix the radix to use while parsing {@code s}; must be between 2081d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * {@link Character#MIN_RADIX} and {@link Character#MAX_RADIX}. 2091d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * @throws NumberFormatException if the string does not contain a valid unsigned {@code int}, or 2101d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * if supplied radix is invalid. 2111d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert */ 2121d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert public static int parseUnsignedInt(String string, int radix) { 2131d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert checkNotNull(string); 2141d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert long result = Long.parseLong(string, radix); 2151d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert if ((result & INT_MASK) != result) { 2161d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert throw new NumberFormatException("Input " + string + " in base " + radix 2171d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert + " is not in the range of an unsigned integer"); 2181d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 2191d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return (int) result; 2201d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 2211d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 2221d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert /** 2231d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Returns a string representation of x, where x is treated as unsigned. 2241d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert */ 2251d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert public static String toString(int x) { 2261d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return toString(x, 10); 2271d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 2281d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 2291d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert /** 2301d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Returns a string representation of {@code x} for the given radix, where {@code x} is treated 2311d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * as unsigned. 2321d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * 2331d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * @param x the value to convert to a string. 2341d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * @param radix the radix to use while working with {@code x} 2351d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * @throws IllegalArgumentException if {@code radix} is not between {@link Character#MIN_RADIX} 2361d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * and {@link Character#MAX_RADIX}. 2371d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert */ 2381d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert public static String toString(int x, int radix) { 2391d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert long asLong = x & INT_MASK; 2401d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return Long.toString(asLong, radix); 2411d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 2421d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert} 243