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 24bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnorimport com.google.common.annotations.GwtCompatible; 25bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 26bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnorimport java.io.Serializable; 27bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnorimport java.util.AbstractList; 28bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnorimport java.util.Collection; 29bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnorimport java.util.Collections; 30bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnorimport java.util.Comparator; 31bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnorimport java.util.List; 32bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnorimport java.util.RandomAccess; 33bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 34bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor/** 35bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Static utility methods pertaining to {@code char} primitives, that are not 36bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * already found in either {@link Character} or {@link Arrays}. 37bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 381d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * <p>All the operations in this class treat {@code char} values strictly 391d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * numerically; they are neither Unicode-aware nor locale-dependent. 401d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * 41bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @author Kevin Bourrillion 421d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * @since 1.0 43bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 441d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert@GwtCompatible(emulated = true) 45bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnorpublic final class Chars { 46bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor private Chars() {} 47bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 48bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 49bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * The number of bytes required to represent a primitive {@code char} 50bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * value. 51bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 52bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public static final int BYTES = Character.SIZE / Byte.SIZE; 53bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 54bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 55bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Returns a hash code for {@code value}; equal to the result of invoking 56bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * {@code ((Character) value).hashCode()}. 57bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 58bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param value a primitive {@code char} value 59bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @return a hash code for the value 60bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 61bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public static int hashCode(char value) { 62bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return value; 63bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 64bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 65bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 66bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Returns the {@code char} value that is equal to {@code value}, if possible. 67bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 68bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param value any value in the range of the {@code char} type 69bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @return the {@code char} value that equals {@code value} 70bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @throws IllegalArgumentException if {@code value} is greater than {@link 71bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Character#MAX_VALUE} or less than {@link Character#MIN_VALUE} 72bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 73bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public static char checkedCast(long value) { 74bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor char result = (char) value; 75bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor checkArgument(result == value, "Out of range: %s", value); 76bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return result; 77bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 78bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 79bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 80bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Returns the {@code char} nearest in value to {@code value}. 81bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 82bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param value any {@code long} value 83bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @return the same value cast to {@code char} if it is in the range of the 84bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * {@code char} type, {@link Character#MAX_VALUE} if it is too large, 85bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * or {@link Character#MIN_VALUE} if it is too small 86bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 87bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public static char saturatedCast(long value) { 88bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (value > Character.MAX_VALUE) { 89bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return Character.MAX_VALUE; 90bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 91bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (value < Character.MIN_VALUE) { 92bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return Character.MIN_VALUE; 93bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 94bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return (char) value; 95bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 96bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 97bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 98bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Compares the two specified {@code char} values. The sign of the value 99bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * returned is the same as that of {@code ((Character) a).compareTo(b)}. 100bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 101bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param a the first {@code char} to compare 102bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param b the second {@code char} to compare 103bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @return a negative value if {@code a} is less than {@code b}; a positive 104bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * value if {@code a} is greater than {@code b}; or zero if they are equal 105bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 106bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public static int compare(char a, char b) { 107bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return a - b; // safe due to restricted range 108bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 109bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 110bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 111bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Returns {@code true} if {@code target} is present as an element anywhere in 112bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * {@code array}. 113bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 114bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param array an array of {@code char} values, possibly empty 115bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param target a primitive {@code char} value 116bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @return {@code true} if {@code array[i] == target} for some value of {@code 117bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * i} 118bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 119bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public static boolean contains(char[] array, char target) { 120bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor for (char value : array) { 121bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (value == target) { 122bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return true; 123bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 124bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 125bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return false; 126bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 127bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 128bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 129bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Returns the index of the first appearance of the value {@code target} in 130bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * {@code array}. 131bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 132bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param array an array of {@code char} values, possibly empty 133bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param target a primitive {@code char} value 134bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @return the least index {@code i} for which {@code array[i] == target}, or 135bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * {@code -1} if no such index exists. 136bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 137bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public static int indexOf(char[] array, char target) { 138bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return indexOf(array, target, 0, array.length); 139bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 140bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 1411d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert // TODO(kevinb): consider making this public 142bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor private static int indexOf( 143bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor char[] array, char target, int start, int end) { 144bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor for (int i = start; i < end; i++) { 145bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (array[i] == target) { 146bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return i; 147bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 148bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 149bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return -1; 150bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 151bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 152bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 153bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Returns the start position of the first occurrence of the specified {@code 154bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * target} within {@code array}, or {@code -1} if there is no such occurrence. 155bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 156bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * <p>More formally, returns the lowest index {@code i} such that {@code 157bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * java.util.Arrays.copyOfRange(array, i, i + target.length)} contains exactly 158bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * the same elements as {@code target}. 159bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 160bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param array the array to search for the sequence {@code target} 161bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param target the array to search for as a sub-sequence of {@code array} 162bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 163bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public static int indexOf(char[] array, char[] target) { 164bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor checkNotNull(array, "array"); 165bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor checkNotNull(target, "target"); 166bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (target.length == 0) { 167bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return 0; 168bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 169bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 170bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor outer: 171bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor for (int i = 0; i < array.length - target.length + 1; i++) { 172bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor for (int j = 0; j < target.length; j++) { 173bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (array[i + j] != target[j]) { 174bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor continue outer; 175bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 176bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 177bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return i; 178bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 179bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return -1; 180bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 181bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 182bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 183bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Returns the index of the last appearance of the value {@code target} in 184bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * {@code array}. 185bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 186bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param array an array of {@code char} values, possibly empty 187bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param target a primitive {@code char} value 188bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @return the greatest index {@code i} for which {@code array[i] == target}, 189bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * or {@code -1} if no such index exists. 190bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 191bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public static int lastIndexOf(char[] array, char target) { 192bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return lastIndexOf(array, target, 0, array.length); 193bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 194bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 1951d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert // TODO(kevinb): consider making this public 196bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor private static int lastIndexOf( 197bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor char[] array, char target, int start, int end) { 198bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor for (int i = end - 1; i >= start; i--) { 199bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (array[i] == target) { 200bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return i; 201bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 202bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 203bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return -1; 204bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 205bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 206bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 207bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Returns the least value present in {@code array}. 208bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 209bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param array a <i>nonempty</i> array of {@code char} values 210bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @return the value present in {@code array} that is less than or equal to 211bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * every other value in the array 212bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @throws IllegalArgumentException if {@code array} is empty 213bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 214bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public static char min(char... array) { 215bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor checkArgument(array.length > 0); 216bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor char min = array[0]; 217bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor for (int i = 1; i < array.length; i++) { 218bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (array[i] < min) { 219bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor min = array[i]; 220bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 221bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 222bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return min; 223bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 224bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 225bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 226bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Returns the greatest value present in {@code array}. 227bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 228bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param array a <i>nonempty</i> array of {@code char} values 229bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @return the value present in {@code array} that is greater than or equal to 230bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * every other value in the array 231bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @throws IllegalArgumentException if {@code array} is empty 232bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 233bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public static char max(char... array) { 234bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor checkArgument(array.length > 0); 235bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor char max = array[0]; 236bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor for (int i = 1; i < array.length; i++) { 237bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (array[i] > max) { 238bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor max = array[i]; 239bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 240bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 241bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return max; 242bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 243bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 244bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 245bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Returns the values from each provided array combined into a single array. 246bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * For example, {@code concat(new char[] {a, b}, new char[] {}, new 247bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * char[] {c}} returns the array {@code {a, b, c}}. 248bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 249bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param arrays zero or more {@code char} arrays 250bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @return a single array containing all the values from the source arrays, in 251bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * order 252bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 253bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public static char[] concat(char[]... arrays) { 254bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor int length = 0; 255bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor for (char[] array : arrays) { 256bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor length += array.length; 257bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 258bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor char[] result = new char[length]; 259bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor int pos = 0; 260bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor for (char[] array : arrays) { 261bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor System.arraycopy(array, 0, result, pos, array.length); 262bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor pos += array.length; 263bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 264bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return result; 265bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 266bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 267bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 268bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Returns an array containing the same values as {@code array}, but 269bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * guaranteed to be of a specified minimum length. If {@code array} already 270bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * has a length of at least {@code minLength}, it is returned directly. 271bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Otherwise, a new array of size {@code minLength + padding} is returned, 272bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * containing the values of {@code array}, and zeroes in the remaining places. 273bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 274bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param array the source array 275bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param minLength the minimum length the returned array must guarantee 276bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param padding an extra amount to "grow" the array by if growth is 277bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * necessary 278bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @throws IllegalArgumentException if {@code minLength} or {@code padding} is 279bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * negative 280bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @return an array containing the values of {@code array}, with guaranteed 281bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * minimum length {@code minLength} 282bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 283bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public static char[] ensureCapacity( 284bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor char[] array, int minLength, int padding) { 285bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor checkArgument(minLength >= 0, "Invalid minLength: %s", minLength); 286bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor checkArgument(padding >= 0, "Invalid padding: %s", padding); 287bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return (array.length < minLength) 288bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor ? copyOf(array, minLength + padding) 289bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor : array; 290bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 291bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 292bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor // Arrays.copyOf() requires Java 6 293bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor private static char[] copyOf(char[] original, int length) { 294bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor char[] copy = new char[length]; 295bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor System.arraycopy(original, 0, copy, 0, Math.min(original.length, length)); 296bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return copy; 297bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 298bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 299bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 300bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Returns a string containing the supplied {@code char} values separated 301bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * by {@code separator}. For example, {@code join("-", '1', '2', '3')} returns 302bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * the string {@code "1-2-3"}. 303bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 304bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param separator the text that should appear between consecutive values in 305bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * the resulting string (but not at the start or end) 306bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param array an array of {@code char} values, possibly empty 307bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 308bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public static String join(String separator, char... array) { 309bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor checkNotNull(separator); 310bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor int len = array.length; 311bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (len == 0) { 312bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return ""; 313bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 314bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 315bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor StringBuilder builder 316bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor = new StringBuilder(len + separator.length() * (len - 1)); 317bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor builder.append(array[0]); 318bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor for (int i = 1; i < len; i++) { 319bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor builder.append(separator).append(array[i]); 320bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 321bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return builder.toString(); 322bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 323bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 324bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 325bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Returns a comparator that compares two {@code char} arrays 326bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * lexicographically. That is, it compares, using {@link 327bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * #compare(char, char)}), the first pair of values that follow any 328bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * common prefix, or when one array is a prefix of the other, treats the 329bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * shorter array as the lesser. For example, 330bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * {@code [] < ['a'] < ['a', 'b'] < ['b']}. 331bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 332bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * <p>The returned comparator is inconsistent with {@link 333bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Object#equals(Object)} (since arrays support only identity equality), but 334bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * it is consistent with {@link Arrays#equals(char[], char[])}. 335bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 336bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @see <a href="http://en.wikipedia.org/wiki/Lexicographical_order"> 3371d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Lexicographical order article at Wikipedia</a> 3381d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * @since 2.0 339bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 340bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public static Comparator<char[]> lexicographicalComparator() { 341bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return LexicographicalComparator.INSTANCE; 342bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 343bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 344bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor private enum LexicographicalComparator implements Comparator<char[]> { 345bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor INSTANCE; 346bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 3471d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert @Override 348bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public int compare(char[] left, char[] right) { 349bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor int minLength = Math.min(left.length, right.length); 350bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor for (int i = 0; i < minLength; i++) { 351bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor int result = Chars.compare(left[i], right[i]); 352bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (result != 0) { 353bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return result; 354bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 355bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 356bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return left.length - right.length; 357bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 358bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 359bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 360bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 361bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Copies a collection of {@code Character} instances into a new array of 362bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * primitive {@code char} values. 363bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 364bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * <p>Elements are copied from the argument collection as if by {@code 365bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * collection.toArray()}. Calling this method is as thread-safe as calling 366bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * that method. 367bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 368bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param collection a collection of {@code Character} objects 369bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @return an array containing the same values as {@code collection}, in the 370bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * same order, converted to primitives 371bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @throws NullPointerException if {@code collection} or any of its elements 372bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * is null 373bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 374bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public static char[] toArray(Collection<Character> collection) { 375bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (collection instanceof CharArrayAsList) { 376bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return ((CharArrayAsList) collection).toCharArray(); 377bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 378bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 379bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor Object[] boxedArray = collection.toArray(); 380bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor int len = boxedArray.length; 381bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor char[] array = new char[len]; 382bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor for (int i = 0; i < len; i++) { 3831d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert // checkNotNull for GWT (do not optimize) 3841d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert array[i] = (Character) checkNotNull(boxedArray[i]); 385bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 386bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return array; 387bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 388bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 389bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 390bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Returns a fixed-size list backed by the specified array, similar to {@link 391bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Arrays#asList(Object[])}. The list supports {@link List#set(int, Object)}, 392bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * but any attempt to set a value to {@code null} will result in a {@link 393bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * NullPointerException}. 394bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 395bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * <p>The returned list maintains the values, but not the identities, of 396bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * {@code Character} objects written to or read from it. For example, whether 397bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * {@code list.get(0) == list.get(0)} is true for the returned list is 398bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * unspecified. 399bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 400bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param backingArray the array to back the list 401bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @return a list view of the array 402bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 403bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public static List<Character> asList(char... backingArray) { 404bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (backingArray.length == 0) { 405bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return Collections.emptyList(); 406bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 407bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return new CharArrayAsList(backingArray); 408bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 409bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 410bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor @GwtCompatible 411bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor private static class CharArrayAsList extends AbstractList<Character> 412bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor implements RandomAccess, Serializable { 413bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor final char[] array; 414bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor final int start; 415bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor final int end; 416bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 417bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor CharArrayAsList(char[] array) { 418bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor this(array, 0, array.length); 419bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 420bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 421bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor CharArrayAsList(char[] array, int start, int end) { 422bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor this.array = array; 423bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor this.start = start; 424bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor this.end = end; 425bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 426bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 427bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor @Override public int size() { 428bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return end - start; 429bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 430bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 431bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor @Override public boolean isEmpty() { 432bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return false; 433bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 434bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 435bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor @Override public Character get(int index) { 436bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor checkElementIndex(index, size()); 437bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return array[start + index]; 438bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 439bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 440bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor @Override public boolean contains(Object target) { 441bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor // Overridden to prevent a ton of boxing 442bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return (target instanceof Character) 443bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor && Chars.indexOf(array, (Character) target, start, end) != -1; 444bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 445bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 446bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor @Override public int indexOf(Object target) { 447bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor // Overridden to prevent a ton of boxing 448bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (target instanceof Character) { 449bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor int i = Chars.indexOf(array, (Character) target, start, end); 450bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (i >= 0) { 451bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return i - start; 452bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 453bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 454bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return -1; 455bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 456bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 457bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor @Override public int lastIndexOf(Object target) { 458bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor // Overridden to prevent a ton of boxing 459bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (target instanceof Character) { 460bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor int i = Chars.lastIndexOf(array, (Character) target, start, end); 461bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (i >= 0) { 462bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return i - start; 463bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 464bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 465bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return -1; 466bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 467bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 468bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor @Override public Character set(int index, Character element) { 469bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor checkElementIndex(index, size()); 470bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor char oldValue = array[start + index]; 4711d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert array[start + index] = checkNotNull(element); // checkNotNull for GWT (do not optimize) 472bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return oldValue; 473bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 474bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 4751d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert @Override public List<Character> subList(int fromIndex, int toIndex) { 476bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor int size = size(); 477bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor checkPositionIndexes(fromIndex, toIndex, size); 478bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (fromIndex == toIndex) { 479bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return Collections.emptyList(); 480bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 481bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return new CharArrayAsList(array, start + fromIndex, start + toIndex); 482bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 483bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 484bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor @Override public boolean equals(Object object) { 485bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (object == this) { 486bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return true; 487bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 488bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (object instanceof CharArrayAsList) { 489bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor CharArrayAsList that = (CharArrayAsList) object; 490bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor int size = size(); 491bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (that.size() != size) { 492bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return false; 493bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 494bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor for (int i = 0; i < size; i++) { 495bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (array[start + i] != that.array[that.start + i]) { 496bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return false; 497bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 498bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 499bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return true; 500bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 501bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return super.equals(object); 502bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 503bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 504bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor @Override public int hashCode() { 505bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor int result = 1; 506bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor for (int i = start; i < end; i++) { 507bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor result = 31 * result + Chars.hashCode(array[i]); 508bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 509bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return result; 510bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 511bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 512bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor @Override public String toString() { 513bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor StringBuilder builder = new StringBuilder(size() * 3); 514bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor builder.append('[').append(array[start]); 515bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor for (int i = start + 1; i < end; i++) { 516bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor builder.append(", ").append(array[i]); 517bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 518bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return builder.append(']').toString(); 519bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 520bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 521bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor char[] toCharArray() { 522bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor // Arrays.copyOfRange() requires Java 6 523bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor int size = size(); 524bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor char[] result = new char[size]; 525bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor System.arraycopy(array, start, result, 0, size); 526bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return result; 527bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 528bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 529bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor private static final long serialVersionUID = 0; 530bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 531bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor} 5321d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 533