1bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor/* 21d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Copyright (C) 2008 The Guava Authors 3bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 4bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Licensed under the Apache License, Version 2.0 (the "License"); 5bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * you may not use this file except in compliance with the License. 6bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * You may obtain a copy of the License at 7bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 8bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * http://www.apache.org/licenses/LICENSE-2.0 9bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 10bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Unless required by applicable law or agreed to in writing, software 11bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * distributed under the License is distributed on an "AS IS" BASIS, 12bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * See the License for the specific language governing permissions and 14bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * limitations under the License. 15bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 16bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 17bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnorpackage com.google.common.primitives; 18bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 191d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport static com.google.common.base.Preconditions.checkArgument; 201d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport static com.google.common.base.Preconditions.checkElementIndex; 211d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport static com.google.common.base.Preconditions.checkNotNull; 221d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport static com.google.common.base.Preconditions.checkPositionIndexes; 231d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 241d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport com.google.common.annotations.Beta; 25bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnorimport com.google.common.annotations.GwtCompatible; 26bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnorimport com.google.common.annotations.GwtIncompatible; 27bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 28bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnorimport java.io.Serializable; 29bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnorimport java.util.AbstractList; 30bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnorimport java.util.Arrays; 31bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnorimport java.util.Collection; 32bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnorimport java.util.Collections; 33bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnorimport java.util.Comparator; 34bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnorimport java.util.List; 35bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnorimport java.util.RandomAccess; 36bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 371d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport javax.annotation.CheckForNull; 38bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 39bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor/** 40bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Static utility methods pertaining to {@code int} primitives, that are not 41bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * already found in either {@link Integer} or {@link Arrays}. 42bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 43bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @author Kevin Bourrillion 441d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * @since 1.0 45bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 461d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert@GwtCompatible(emulated = true) 47bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnorpublic final class Ints { 48bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor private Ints() {} 49bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 50bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 51bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * The number of bytes required to represent a primitive {@code int} 52bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * value. 53bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 54bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public static final int BYTES = Integer.SIZE / Byte.SIZE; 55bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 56bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 571d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * The largest power of two that can be represented as an {@code int}. 581d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * 591d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * @since 10.0 601d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert */ 611d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert public static final int MAX_POWER_OF_TWO = 1 << (Integer.SIZE - 2); 621d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 631d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert /** 64bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Returns a hash code for {@code value}; equal to the result of invoking 65bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * {@code ((Integer) value).hashCode()}. 66bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 67bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param value a primitive {@code int} value 68bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @return a hash code for the value 69bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 70bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public static int hashCode(int value) { 71bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return value; 72bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 73bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 74bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 75bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Returns the {@code int} value that is equal to {@code value}, if possible. 76bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 77bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param value any value in the range of the {@code int} type 78bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @return the {@code int} value that equals {@code value} 79bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @throws IllegalArgumentException if {@code value} is greater than {@link 80bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Integer#MAX_VALUE} or less than {@link Integer#MIN_VALUE} 81bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 82bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public static int checkedCast(long value) { 83bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor int result = (int) value; 84bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor checkArgument(result == value, "Out of range: %s", value); 85bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return result; 86bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 87bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 88bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 89bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Returns the {@code int} nearest in value to {@code value}. 90bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 91bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param value any {@code long} value 92bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @return the same value cast to {@code int} if it is in the range of the 93bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * {@code int} type, {@link Integer#MAX_VALUE} if it is too large, 94bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * or {@link Integer#MIN_VALUE} if it is too small 95bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 96bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public static int saturatedCast(long value) { 97bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (value > Integer.MAX_VALUE) { 98bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return Integer.MAX_VALUE; 99bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 100bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (value < Integer.MIN_VALUE) { 101bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return Integer.MIN_VALUE; 102bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 103bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return (int) value; 104bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 105bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 106bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 107bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Compares the two specified {@code int} values. The sign of the value 108bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * returned is the same as that of {@code ((Integer) a).compareTo(b)}. 109bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 110bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param a the first {@code int} to compare 111bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param b the second {@code int} to compare 112bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @return a negative value if {@code a} is less than {@code b}; a positive 113bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * value if {@code a} is greater than {@code b}; or zero if they are equal 114bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 115bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public static int compare(int a, int b) { 116bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return (a < b) ? -1 : ((a > b) ? 1 : 0); 117bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 118bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 119bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 120bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Returns {@code true} if {@code target} is present as an element anywhere in 121bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * {@code array}. 122bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 123bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param array an array of {@code int} values, possibly empty 124bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param target a primitive {@code int} value 125bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @return {@code true} if {@code array[i] == target} for some value of {@code 126bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * i} 127bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 128bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public static boolean contains(int[] array, int target) { 129bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor for (int value : array) { 130bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (value == target) { 131bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return true; 132bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 133bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 134bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return false; 135bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 136bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 137bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 138bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Returns the index of the first appearance of the value {@code target} in 139bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * {@code array}. 140bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 141bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param array an array of {@code int} values, possibly empty 142bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param target a primitive {@code int} value 143bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @return the least index {@code i} for which {@code array[i] == target}, or 144bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * {@code -1} if no such index exists. 145bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 146bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public static int indexOf(int[] array, int target) { 147bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return indexOf(array, target, 0, array.length); 148bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 149bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 1501d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert // TODO(kevinb): consider making this public 151bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor private static int indexOf( 152bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor int[] array, int target, int start, int end) { 153bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor for (int i = start; i < end; i++) { 154bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (array[i] == target) { 155bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return i; 156bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 157bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 158bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return -1; 159bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 160bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 161bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 162bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Returns the start position of the first occurrence of the specified {@code 163bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * target} within {@code array}, or {@code -1} if there is no such occurrence. 164bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 165bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * <p>More formally, returns the lowest index {@code i} such that {@code 166bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * java.util.Arrays.copyOfRange(array, i, i + target.length)} contains exactly 167bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * the same elements as {@code target}. 168bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 169bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param array the array to search for the sequence {@code target} 170bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param target the array to search for as a sub-sequence of {@code array} 171bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 172bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public static int indexOf(int[] array, int[] target) { 173bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor checkNotNull(array, "array"); 174bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor checkNotNull(target, "target"); 175bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (target.length == 0) { 176bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return 0; 177bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 178bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 179bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor outer: 180bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor for (int i = 0; i < array.length - target.length + 1; i++) { 181bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor for (int j = 0; j < target.length; j++) { 182bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (array[i + j] != target[j]) { 183bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor continue outer; 184bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 185bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 186bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return i; 187bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 188bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return -1; 189bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 190bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 191bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 192bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Returns the index of the last appearance of the value {@code target} in 193bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * {@code array}. 194bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 195bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param array an array of {@code int} values, possibly empty 196bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param target a primitive {@code int} value 197bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @return the greatest index {@code i} for which {@code array[i] == target}, 198bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * or {@code -1} if no such index exists. 199bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 200bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public static int lastIndexOf(int[] array, int target) { 201bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return lastIndexOf(array, target, 0, array.length); 202bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 203bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 2041d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert // TODO(kevinb): consider making this public 205bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor private static int lastIndexOf( 206bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor int[] array, int target, int start, int end) { 207bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor for (int i = end - 1; i >= start; i--) { 208bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (array[i] == target) { 209bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return i; 210bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 211bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 212bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return -1; 213bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 214bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 215bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 216bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Returns the least value present in {@code array}. 217bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 218bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param array a <i>nonempty</i> array of {@code int} values 219bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @return the value present in {@code array} that is less than or equal to 220bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * every other value in the array 221bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @throws IllegalArgumentException if {@code array} is empty 222bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 223bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public static int min(int... array) { 224bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor checkArgument(array.length > 0); 225bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor int min = array[0]; 226bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor for (int i = 1; i < array.length; i++) { 227bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (array[i] < min) { 228bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor min = array[i]; 229bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 230bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 231bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return min; 232bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 233bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 234bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 235bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Returns the greatest value present in {@code array}. 236bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 237bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param array a <i>nonempty</i> array of {@code int} values 238bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @return the value present in {@code array} that is greater than or equal to 239bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * every other value in the array 240bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @throws IllegalArgumentException if {@code array} is empty 241bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 242bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public static int max(int... array) { 243bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor checkArgument(array.length > 0); 244bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor int max = array[0]; 245bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor for (int i = 1; i < array.length; i++) { 246bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (array[i] > max) { 247bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor max = array[i]; 248bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 249bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 250bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return max; 251bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 252bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 253bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 254bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Returns the values from each provided array combined into a single array. 255bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * For example, {@code concat(new int[] {a, b}, new int[] {}, new 256bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * int[] {c}} returns the array {@code {a, b, c}}. 257bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 258bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param arrays zero or more {@code int} arrays 259bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @return a single array containing all the values from the source arrays, in 260bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * order 261bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 262bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public static int[] concat(int[]... arrays) { 263bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor int length = 0; 264bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor for (int[] array : arrays) { 265bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor length += array.length; 266bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 267bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor int[] result = new int[length]; 268bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor int pos = 0; 269bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor for (int[] array : arrays) { 270bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor System.arraycopy(array, 0, result, pos, array.length); 271bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor pos += array.length; 272bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 273bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return result; 274bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 275bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 276bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 277bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Returns a big-endian representation of {@code value} in a 4-element byte 278bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * array; equivalent to {@code ByteBuffer.allocate(4).putInt(value).array()}. 279bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * For example, the input value {@code 0x12131415} would yield the byte array 280bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * {@code {0x12, 0x13, 0x14, 0x15}}. 281bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 282bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * <p>If you need to convert and concatenate several values (possibly even of 283bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * different types), use a shared {@link java.nio.ByteBuffer} instance, or use 284bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * {@link com.google.common.io.ByteStreams#newDataOutput()} to get a growable 285bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * buffer. 286bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 287bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor @GwtIncompatible("doesn't work") 288bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public static byte[] toByteArray(int value) { 289bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return new byte[] { 290bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor (byte) (value >> 24), 291bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor (byte) (value >> 16), 292bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor (byte) (value >> 8), 293bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor (byte) value}; 294bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 295bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 296bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 297bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Returns the {@code int} value whose big-endian representation is stored in 298bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * the first 4 bytes of {@code bytes}; equivalent to {@code 299bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * ByteBuffer.wrap(bytes).getInt()}. For example, the input byte array {@code 300bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * {0x12, 0x13, 0x14, 0x15, 0x33}} would yield the {@code int} value {@code 301bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 0x12131415}. 302bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 303bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * <p>Arguably, it's preferable to use {@link java.nio.ByteBuffer}; that 304bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * library exposes much more flexibility at little cost in readability. 305bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 306bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @throws IllegalArgumentException if {@code bytes} has fewer than 4 elements 307bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 308bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor @GwtIncompatible("doesn't work") 309bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public static int fromByteArray(byte[] bytes) { 310bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor checkArgument(bytes.length >= BYTES, 311bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor "array too small: %s < %s", bytes.length, BYTES); 3121d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return fromBytes(bytes[0], bytes[1], bytes[2], bytes[3]); 3131d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 3141d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 3151d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert /** 3161d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Returns the {@code int} value whose byte representation is the given 4 3171d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * bytes, in big-endian order; equivalent to {@code Ints.fromByteArray(new 3181d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * byte[] {b1, b2, b3, b4})}. 3191d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * 3201d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * @since 7.0 3211d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert */ 3221d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert @GwtIncompatible("doesn't work") 3231d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert public static int fromBytes(byte b1, byte b2, byte b3, byte b4) { 3241d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return b1 << 24 | (b2 & 0xFF) << 16 | (b3 & 0xFF) << 8 | (b4 & 0xFF); 325bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 326bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 327bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 328bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Returns an array containing the same values as {@code array}, but 329bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * guaranteed to be of a specified minimum length. If {@code array} already 330bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * has a length of at least {@code minLength}, it is returned directly. 331bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Otherwise, a new array of size {@code minLength + padding} is returned, 332bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * containing the values of {@code array}, and zeroes in the remaining places. 333bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 334bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param array the source array 335bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param minLength the minimum length the returned array must guarantee 336bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param padding an extra amount to "grow" the array by if growth is 337bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * necessary 338bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @throws IllegalArgumentException if {@code minLength} or {@code padding} is 339bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * negative 340bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @return an array containing the values of {@code array}, with guaranteed 341bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * minimum length {@code minLength} 342bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 343bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public static int[] ensureCapacity( 344bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor int[] array, int minLength, int padding) { 345bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor checkArgument(minLength >= 0, "Invalid minLength: %s", minLength); 346bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor checkArgument(padding >= 0, "Invalid padding: %s", padding); 347bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return (array.length < minLength) 348bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor ? copyOf(array, minLength + padding) 349bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor : array; 350bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 351bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 352bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor // Arrays.copyOf() requires Java 6 353bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor private static int[] copyOf(int[] original, int length) { 354bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor int[] copy = new int[length]; 355bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor System.arraycopy(original, 0, copy, 0, Math.min(original.length, length)); 356bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return copy; 357bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 358bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 359bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 360bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Returns a string containing the supplied {@code int} values separated 361bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * by {@code separator}. For example, {@code join("-", 1, 2, 3)} returns 362bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * the string {@code "1-2-3"}. 363bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 364bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param separator the text that should appear between consecutive values in 365bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * the resulting string (but not at the start or end) 366bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param array an array of {@code int} values, possibly empty 367bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 368bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public static String join(String separator, int... array) { 369bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor checkNotNull(separator); 370bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (array.length == 0) { 371bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return ""; 372bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 373bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 374bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor // For pre-sizing a builder, just get the right order of magnitude 375bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor StringBuilder builder = new StringBuilder(array.length * 5); 376bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor builder.append(array[0]); 377bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor for (int i = 1; i < array.length; i++) { 378bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor builder.append(separator).append(array[i]); 379bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 380bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return builder.toString(); 381bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 382bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 383bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 384bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Returns a comparator that compares two {@code int} arrays 385bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * lexicographically. That is, it compares, using {@link 386bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * #compare(int, int)}), the first pair of values that follow any 387bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * common prefix, or when one array is a prefix of the other, treats the 388bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * shorter array as the lesser. For example, {@code [] < [1] < [1, 2] < [2]}. 389bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 390bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * <p>The returned comparator is inconsistent with {@link 391bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Object#equals(Object)} (since arrays support only identity equality), but 392bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * it is consistent with {@link Arrays#equals(int[], int[])}. 393bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 394bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @see <a href="http://en.wikipedia.org/wiki/Lexicographical_order"> 3951d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Lexicographical order article at Wikipedia</a> 3961d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * @since 2.0 397bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 398bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public static Comparator<int[]> lexicographicalComparator() { 399bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return LexicographicalComparator.INSTANCE; 400bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 401bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 402bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor private enum LexicographicalComparator implements Comparator<int[]> { 403bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor INSTANCE; 404bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 4051d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert @Override 406bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public int compare(int[] left, int[] right) { 407bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor int minLength = Math.min(left.length, right.length); 408bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor for (int i = 0; i < minLength; i++) { 409bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor int result = Ints.compare(left[i], right[i]); 410bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (result != 0) { 411bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return result; 412bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 413bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 414bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return left.length - right.length; 415bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 416bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 417bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 418bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 419bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Copies a collection of {@code Integer} instances into a new array of 420bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * primitive {@code int} values. 421bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 422bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * <p>Elements are copied from the argument collection as if by {@code 423bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * collection.toArray()}. Calling this method is as thread-safe as calling 424bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * that method. 425bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 426bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param collection a collection of {@code Integer} objects 427bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @return an array containing the same values as {@code collection}, in the 428bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * same order, converted to primitives 429bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @throws NullPointerException if {@code collection} or any of its elements 430bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * is null 431bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 432bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public static int[] toArray(Collection<Integer> collection) { 433bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (collection instanceof IntArrayAsList) { 434bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return ((IntArrayAsList) collection).toIntArray(); 435bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 436bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 437bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor Object[] boxedArray = collection.toArray(); 438bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor int len = boxedArray.length; 439bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor int[] array = new int[len]; 440bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor for (int i = 0; i < len; i++) { 4411d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert // checkNotNull for GWT (do not optimize) 4421d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert array[i] = (Integer) checkNotNull(boxedArray[i]); 443bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 444bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return array; 445bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 446bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 447bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 448bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Returns a fixed-size list backed by the specified array, similar to {@link 449bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Arrays#asList(Object[])}. The list supports {@link List#set(int, Object)}, 450bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * but any attempt to set a value to {@code null} will result in a {@link 451bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * NullPointerException}. 452bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 453bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * <p>The returned list maintains the values, but not the identities, of 454bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * {@code Integer} objects written to or read from it. For example, whether 455bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * {@code list.get(0) == list.get(0)} is true for the returned list is 456bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * unspecified. 457bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 458bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param backingArray the array to back the list 459bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @return a list view of the array 460bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 461bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public static List<Integer> asList(int... backingArray) { 462bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (backingArray.length == 0) { 463bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return Collections.emptyList(); 464bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 465bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return new IntArrayAsList(backingArray); 466bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 467bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 468bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor @GwtCompatible 469bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor private static class IntArrayAsList extends AbstractList<Integer> 470bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor implements RandomAccess, Serializable { 471bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor final int[] array; 472bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor final int start; 473bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor final int end; 474bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 475bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor IntArrayAsList(int[] array) { 476bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor this(array, 0, array.length); 477bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 478bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 479bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor IntArrayAsList(int[] array, int start, int end) { 480bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor this.array = array; 481bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor this.start = start; 482bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor this.end = end; 483bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 484bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 485bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor @Override public int size() { 486bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return end - start; 487bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 488bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 489bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor @Override public boolean isEmpty() { 490bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return false; 491bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 492bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 493bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor @Override public Integer get(int index) { 494bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor checkElementIndex(index, size()); 495bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return array[start + index]; 496bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 497bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 498bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor @Override public boolean contains(Object target) { 499bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor // Overridden to prevent a ton of boxing 500bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return (target instanceof Integer) 501bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor && Ints.indexOf(array, (Integer) target, start, end) != -1; 502bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 503bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 504bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor @Override public int indexOf(Object target) { 505bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor // Overridden to prevent a ton of boxing 506bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (target instanceof Integer) { 507bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor int i = Ints.indexOf(array, (Integer) target, start, end); 508bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (i >= 0) { 509bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return i - start; 510bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 511bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 512bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return -1; 513bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 514bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 515bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor @Override public int lastIndexOf(Object target) { 516bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor // Overridden to prevent a ton of boxing 517bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (target instanceof Integer) { 518bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor int i = Ints.lastIndexOf(array, (Integer) target, start, end); 519bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (i >= 0) { 520bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return i - start; 521bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 522bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 523bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return -1; 524bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 525bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 526bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor @Override public Integer set(int index, Integer element) { 527bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor checkElementIndex(index, size()); 528bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor int oldValue = array[start + index]; 5291d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert array[start + index] = checkNotNull(element); // checkNotNull for GWT (do not optimize) 530bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return oldValue; 531bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 532bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 5331d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert @Override public List<Integer> subList(int fromIndex, int toIndex) { 534bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor int size = size(); 535bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor checkPositionIndexes(fromIndex, toIndex, size); 536bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (fromIndex == toIndex) { 537bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return Collections.emptyList(); 538bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 539bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return new IntArrayAsList(array, start + fromIndex, start + toIndex); 540bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 541bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 542bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor @Override public boolean equals(Object object) { 543bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (object == this) { 544bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return true; 545bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 546bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (object instanceof IntArrayAsList) { 547bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor IntArrayAsList that = (IntArrayAsList) object; 548bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor int size = size(); 549bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (that.size() != size) { 550bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return false; 551bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 552bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor for (int i = 0; i < size; i++) { 553bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (array[start + i] != that.array[that.start + i]) { 554bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return false; 555bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 556bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 557bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return true; 558bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 559bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return super.equals(object); 560bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 561bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 562bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor @Override public int hashCode() { 563bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor int result = 1; 564bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor for (int i = start; i < end; i++) { 565bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor result = 31 * result + Ints.hashCode(array[i]); 566bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 567bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return result; 568bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 569bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 570bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor @Override public String toString() { 571bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor StringBuilder builder = new StringBuilder(size() * 5); 572bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor builder.append('[').append(array[start]); 573bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor for (int i = start + 1; i < end; i++) { 574bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor builder.append(", ").append(array[i]); 575bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 576bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return builder.append(']').toString(); 577bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 578bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 579bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor int[] toIntArray() { 580bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor // Arrays.copyOfRange() requires Java 6 581bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor int size = size(); 582bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor int[] result = new int[size]; 583bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor System.arraycopy(array, start, result, 0, size); 584bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return result; 585bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 586bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 587bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor private static final long serialVersionUID = 0; 588bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 5891d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 5901d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert /** 5911d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Parses the specified string as a signed decimal integer value. The ASCII 5921d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * character {@code '-'} (<code>'\u002D'</code>) is recognized as the 5931d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * minus sign. 5941d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * 5951d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * <p>Unlike {@link Integer#parseInt(String)}, this method returns 5961d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * {@code null} instead of throwing an exception if parsing fails. 5971d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * 5981d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * <p>Note that strings prefixed with ASCII {@code '+'} are rejected, even 5991d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * under JDK 7, despite the change to {@link Integer#parseInt(String)} for 6001d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * that version. 6011d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * 6021d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * @param string the string representation of an integer value 6031d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * @return the integer value represented by {@code string}, or {@code null} if 6041d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * {@code string} has a length of zero or cannot be parsed as an integer 6051d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * value 6061d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * @since 11.0 6071d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert */ 6081d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert @Beta 6091d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert @CheckForNull 6101d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert @GwtIncompatible("TODO") 6111d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert public static Integer tryParse(String string) { 6121d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return AndroidInteger.tryParse(string, 10); 6131d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 614bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor} 615