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 Egnorimport com.google.common.annotations.GwtIncompatible; 26bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 27bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnorimport java.io.Serializable; 28bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnorimport java.util.AbstractList; 29bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnorimport java.util.Arrays; 30bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnorimport java.util.Collection; 31bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnorimport java.util.Collections; 32bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnorimport java.util.Comparator; 33bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnorimport java.util.List; 34bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnorimport java.util.RandomAccess; 35bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 36bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor/** 37bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Static utility methods pertaining to {@code long} primitives, that are not 38bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * already found in either {@link Long} or {@link Arrays}. 39bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 40bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @author Kevin Bourrillion 411d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * @since 1.0 42bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 431d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert@GwtCompatible(emulated = true) 44bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnorpublic final class Longs { 45bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor private Longs() {} 46bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 47bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 48bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * The number of bytes required to represent a primitive {@code long} 49bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * value. 50bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 51bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public static final int BYTES = Long.SIZE / Byte.SIZE; 52bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 53bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 541d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * The largest power of two that can be represented as a {@code long}. 551d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * 561d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * @since 10.0 571d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert */ 581d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert public static final long MAX_POWER_OF_TWO = 1L << (Long.SIZE - 2); 591d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 601d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert /** 61bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Returns a hash code for {@code value}; equal to the result of invoking 62bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * {@code ((Long) value).hashCode()}. 63bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 641d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * <p>This method always return the value specified by {@link 651d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Long#hashCode()} in java, which might be different from 661d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * {@code ((Long) value).hashCode()} in GWT because {@link Long#hashCode()} 671d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * in GWT does not obey the JRE contract. 681d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * 69bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param value a primitive {@code long} value 70bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @return a hash code for the value 71bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 72bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public static int hashCode(long value) { 73bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return (int) (value ^ (value >>> 32)); 74bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 75bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 76bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 77bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Compares the two specified {@code long} values. The sign of the value 78bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * returned is the same as that of {@code ((Long) a).compareTo(b)}. 79bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 80bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param a the first {@code long} to compare 81bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param b the second {@code long} to compare 82bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @return a negative value if {@code a} is less than {@code b}; a positive 83bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * value if {@code a} is greater than {@code b}; or zero if they are equal 84bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 85bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public static int compare(long a, long b) { 86bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return (a < b) ? -1 : ((a > b) ? 1 : 0); 87bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 88bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 89bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 90bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Returns {@code true} if {@code target} is present as an element anywhere in 91bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * {@code array}. 92bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 93bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param array an array of {@code long} values, possibly empty 94bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param target a primitive {@code long} value 95bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @return {@code true} if {@code array[i] == target} for some value of {@code 96bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * i} 97bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 98bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public static boolean contains(long[] array, long target) { 99bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor for (long value : array) { 100bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (value == target) { 101bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return true; 102bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 103bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 104bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return false; 105bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 106bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 107bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 108bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Returns the index of the first appearance of the value {@code target} in 109bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * {@code array}. 110bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 111bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param array an array of {@code long} values, possibly empty 112bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param target a primitive {@code long} value 113bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @return the least index {@code i} for which {@code array[i] == target}, or 114bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * {@code -1} if no such index exists. 115bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 116bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public static int indexOf(long[] array, long target) { 117bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return indexOf(array, target, 0, array.length); 118bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 119bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 1201d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert // TODO(kevinb): consider making this public 121bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor private static int indexOf( 122bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor long[] array, long target, int start, int end) { 123bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor for (int i = start; i < end; i++) { 124bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (array[i] == target) { 125bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return i; 126bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 127bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 128bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return -1; 129bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 130bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 131bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 132bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Returns the start position of the first occurrence of the specified {@code 133bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * target} within {@code array}, or {@code -1} if there is no such occurrence. 134bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 135bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * <p>More formally, returns the lowest index {@code i} such that {@code 136bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * java.util.Arrays.copyOfRange(array, i, i + target.length)} contains exactly 137bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * the same elements as {@code target}. 138bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 139bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param array the array to search for the sequence {@code target} 140bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param target the array to search for as a sub-sequence of {@code array} 141bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 142bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public static int indexOf(long[] array, long[] target) { 143bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor checkNotNull(array, "array"); 144bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor checkNotNull(target, "target"); 145bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (target.length == 0) { 146bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return 0; 147bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 148bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 149bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor outer: 150bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor for (int i = 0; i < array.length - target.length + 1; i++) { 151bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor for (int j = 0; j < target.length; j++) { 152bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (array[i + j] != target[j]) { 153bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor continue outer; 154bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 155bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 156bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return i; 157bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 158bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return -1; 159bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 160bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 161bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 162bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Returns the index of the last appearance of the value {@code target} in 163bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * {@code array}. 164bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 165bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param array an array of {@code long} values, possibly empty 166bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param target a primitive {@code long} value 167bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @return the greatest index {@code i} for which {@code array[i] == target}, 168bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * or {@code -1} if no such index exists. 169bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 170bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public static int lastIndexOf(long[] array, long target) { 171bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return lastIndexOf(array, target, 0, array.length); 172bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 173bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 1741d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert // TODO(kevinb): consider making this public 175bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor private static int lastIndexOf( 176bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor long[] array, long target, int start, int end) { 177bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor for (int i = end - 1; i >= start; i--) { 178bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (array[i] == target) { 179bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return i; 180bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 181bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 182bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return -1; 183bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 184bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 185bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 186bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Returns the least value present in {@code array}. 187bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 188bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param array a <i>nonempty</i> array of {@code long} values 189bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @return the value present in {@code array} that is less than or equal to 190bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * every other value in the array 191bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @throws IllegalArgumentException if {@code array} is empty 192bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 193bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public static long min(long... array) { 194bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor checkArgument(array.length > 0); 195bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor long min = array[0]; 196bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor for (int i = 1; i < array.length; i++) { 197bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (array[i] < min) { 198bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor min = array[i]; 199bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 200bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 201bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return min; 202bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 203bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 204bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 205bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Returns the greatest value present in {@code array}. 206bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 207bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param array a <i>nonempty</i> array of {@code long} values 208bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @return the value present in {@code array} that is greater than or equal to 209bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * every other value in the array 210bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @throws IllegalArgumentException if {@code array} is empty 211bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 212bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public static long max(long... array) { 213bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor checkArgument(array.length > 0); 214bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor long max = array[0]; 215bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor for (int i = 1; i < array.length; i++) { 216bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (array[i] > max) { 217bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor max = array[i]; 218bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 219bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 220bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return max; 221bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 222bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 223bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 224bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Returns the values from each provided array combined into a single array. 225bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * For example, {@code concat(new long[] {a, b}, new long[] {}, new 226bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * long[] {c}} returns the array {@code {a, b, c}}. 227bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 228bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param arrays zero or more {@code long} arrays 229bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @return a single array containing all the values from the source arrays, in 230bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * order 231bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 232bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public static long[] concat(long[]... arrays) { 233bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor int length = 0; 234bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor for (long[] array : arrays) { 235bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor length += array.length; 236bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 237bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor long[] result = new long[length]; 238bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor int pos = 0; 239bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor for (long[] array : arrays) { 240bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor System.arraycopy(array, 0, result, pos, array.length); 241bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor pos += array.length; 242bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 243bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return result; 244bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 245bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 246bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 247bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Returns a big-endian representation of {@code value} in an 8-element byte 248bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * array; equivalent to {@code ByteBuffer.allocate(8).putLong(value).array()}. 249bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * For example, the input value {@code 0x1213141516171819L} would yield the 250bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * byte array {@code {0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19}}. 251bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 252bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * <p>If you need to convert and concatenate several values (possibly even of 253bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * different types), use a shared {@link java.nio.ByteBuffer} instance, or use 254bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * {@link com.google.common.io.ByteStreams#newDataOutput()} to get a growable 255bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * buffer. 256bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 257bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor @GwtIncompatible("doesn't work") 258bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public static byte[] toByteArray(long value) { 259bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return new byte[] { 260bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor (byte) (value >> 56), 261bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor (byte) (value >> 48), 262bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor (byte) (value >> 40), 263bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor (byte) (value >> 32), 264bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor (byte) (value >> 24), 265bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor (byte) (value >> 16), 266bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor (byte) (value >> 8), 267bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor (byte) value}; 268bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 269bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 270bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 271bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Returns the {@code long} value whose big-endian representation is 272bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * stored in the first 8 bytes of {@code bytes}; equivalent to {@code 273bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * ByteBuffer.wrap(bytes).getLong()}. For example, the input byte array 274bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * {@code {0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19}} would yield the 275bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * {@code long} value {@code 0x1213141516171819L}. 276bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 277bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * <p>Arguably, it's preferable to use {@link java.nio.ByteBuffer}; that 278bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * library exposes much more flexibility at little cost in readability. 279bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 280bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @throws IllegalArgumentException if {@code bytes} has fewer than 8 281bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * elements 282bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 283bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor @GwtIncompatible("doesn't work") 284bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public static long fromByteArray(byte[] bytes) { 285bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor checkArgument(bytes.length >= BYTES, 286bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor "array too small: %s < %s", bytes.length, BYTES); 2871d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return fromBytes(bytes[0], bytes[1], bytes[2], bytes[3], 2881d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert bytes[4], bytes[5], bytes[6], bytes[7]) ; 2891d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 2901d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 2911d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert /** 2921d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Returns the {@code long} value whose byte representation is the given 8 2931d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * bytes, in big-endian order; equivalent to {@code Longs.fromByteArray(new 2941d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * byte[] {b1, b2, b3, b4, b5, b6, b7, b8})}. 2951d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * 2961d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * @since 7.0 2971d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert */ 2981d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert @GwtIncompatible("doesn't work") 2991d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert public static long fromBytes(byte b1, byte b2, byte b3, byte b4, 3001d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert byte b5, byte b6, byte b7, byte b8) { 3011d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return (b1 & 0xFFL) << 56 3021d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert | (b2 & 0xFFL) << 48 3031d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert | (b3 & 0xFFL) << 40 3041d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert | (b4 & 0xFFL) << 32 3051d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert | (b5 & 0xFFL) << 24 3061d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert | (b6 & 0xFFL) << 16 3071d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert | (b7 & 0xFFL) << 8 3081d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert | (b8 & 0xFFL); 309bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 310bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 311bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 312bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Returns an array containing the same values as {@code array}, but 313bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * guaranteed to be of a specified minimum length. If {@code array} already 314bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * has a length of at least {@code minLength}, it is returned directly. 315bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Otherwise, a new array of size {@code minLength + padding} is returned, 316bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * containing the values of {@code array}, and zeroes in the remaining places. 317bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 318bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param array the source array 319bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param minLength the minimum length the returned array must guarantee 320bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param padding an extra amount to "grow" the array by if growth is 321bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * necessary 322bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @throws IllegalArgumentException if {@code minLength} or {@code padding} is 323bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * negative 324bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @return an array containing the values of {@code array}, with guaranteed 325bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * minimum length {@code minLength} 326bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 327bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public static long[] ensureCapacity( 328bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor long[] array, int minLength, int padding) { 329bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor checkArgument(minLength >= 0, "Invalid minLength: %s", minLength); 330bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor checkArgument(padding >= 0, "Invalid padding: %s", padding); 331bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return (array.length < minLength) 332bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor ? copyOf(array, minLength + padding) 333bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor : array; 334bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 335bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 336bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor // Arrays.copyOf() requires Java 6 337bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor private static long[] copyOf(long[] original, int length) { 338bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor long[] copy = new long[length]; 339bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor System.arraycopy(original, 0, copy, 0, Math.min(original.length, length)); 340bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return copy; 341bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 342bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 343bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 344bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Returns a string containing the supplied {@code long} values separated 345bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * by {@code separator}. For example, {@code join("-", 1L, 2L, 3L)} returns 346bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * the string {@code "1-2-3"}. 347bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 348bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param separator the text that should appear between consecutive values in 349bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * the resulting string (but not at the start or end) 350bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param array an array of {@code long} values, possibly empty 351bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 352bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public static String join(String separator, long... array) { 353bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor checkNotNull(separator); 354bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (array.length == 0) { 355bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return ""; 356bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 357bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 358bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor // For pre-sizing a builder, just get the right order of magnitude 359bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor StringBuilder builder = new StringBuilder(array.length * 10); 360bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor builder.append(array[0]); 361bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor for (int i = 1; i < array.length; i++) { 362bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor builder.append(separator).append(array[i]); 363bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 364bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return builder.toString(); 365bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 366bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 367bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 368bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Returns a comparator that compares two {@code long} arrays 369bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * lexicographically. That is, it compares, using {@link 370bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * #compare(long, long)}), the first pair of values that follow any 371bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * common prefix, or when one array is a prefix of the other, treats the 372bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * shorter array as the lesser. For example, 373bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * {@code [] < [1L] < [1L, 2L] < [2L]}. 374bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 375bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * <p>The returned comparator is inconsistent with {@link 376bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Object#equals(Object)} (since arrays support only identity equality), but 377bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * it is consistent with {@link Arrays#equals(long[], long[])}. 378bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 379bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @see <a href="http://en.wikipedia.org/wiki/Lexicographical_order"> 3801d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Lexicographical order article at Wikipedia</a> 3811d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * @since 2.0 382bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 383bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public static Comparator<long[]> lexicographicalComparator() { 384bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return LexicographicalComparator.INSTANCE; 385bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 386bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 387bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor private enum LexicographicalComparator implements Comparator<long[]> { 388bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor INSTANCE; 389bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 3901d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert @Override 391bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public int compare(long[] left, long[] right) { 392bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor int minLength = Math.min(left.length, right.length); 393bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor for (int i = 0; i < minLength; i++) { 394bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor int result = Longs.compare(left[i], right[i]); 395bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (result != 0) { 396bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return result; 397bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 398bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 399bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return left.length - right.length; 400bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 401bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 402bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 403bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 404bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Copies a collection of {@code Long} instances into a new array of 405bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * primitive {@code long} values. 406bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 407bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * <p>Elements are copied from the argument collection as if by {@code 408bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * collection.toArray()}. Calling this method is as thread-safe as calling 409bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * that method. 410bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 411bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param collection a collection of {@code Long} objects 412bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @return an array containing the same values as {@code collection}, in the 413bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * same order, converted to primitives 414bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @throws NullPointerException if {@code collection} or any of its elements 415bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * is null 416bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 417bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public static long[] toArray(Collection<Long> collection) { 418bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (collection instanceof LongArrayAsList) { 419bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return ((LongArrayAsList) collection).toLongArray(); 420bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 421bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 422bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor Object[] boxedArray = collection.toArray(); 423bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor int len = boxedArray.length; 424bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor long[] array = new long[len]; 425bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor for (int i = 0; i < len; i++) { 4261d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert // checkNotNull for GWT (do not optimize) 4271d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert array[i] = (Long) checkNotNull(boxedArray[i]); 428bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 429bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return array; 430bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 431bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 432bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 433bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Returns a fixed-size list backed by the specified array, similar to {@link 434bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Arrays#asList(Object[])}. The list supports {@link List#set(int, Object)}, 435bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * but any attempt to set a value to {@code null} will result in a {@link 436bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * NullPointerException}. 437bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 438bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * <p>The returned list maintains the values, but not the identities, of 439bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * {@code Long} objects written to or read from it. For example, whether 440bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * {@code list.get(0) == list.get(0)} is true for the returned list is 441bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * unspecified. 442bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 443bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param backingArray the array to back the list 444bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @return a list view of the array 445bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 446bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public static List<Long> asList(long... backingArray) { 447bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (backingArray.length == 0) { 448bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return Collections.emptyList(); 449bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 450bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return new LongArrayAsList(backingArray); 451bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 452bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 453bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor @GwtCompatible 454bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor private static class LongArrayAsList extends AbstractList<Long> 455bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor implements RandomAccess, Serializable { 456bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor final long[] array; 457bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor final int start; 458bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor final int end; 459bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 460bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor LongArrayAsList(long[] array) { 461bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor this(array, 0, array.length); 462bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 463bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 464bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor LongArrayAsList(long[] array, int start, int end) { 465bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor this.array = array; 466bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor this.start = start; 467bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor this.end = end; 468bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 469bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 470bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor @Override public int size() { 471bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return end - start; 472bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 473bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 474bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor @Override public boolean isEmpty() { 475bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return false; 476bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 477bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 478bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor @Override public Long get(int index) { 479bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor checkElementIndex(index, size()); 480bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return array[start + index]; 481bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 482bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 483bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor @Override public boolean contains(Object target) { 484bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor // Overridden to prevent a ton of boxing 485bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return (target instanceof Long) 486bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor && Longs.indexOf(array, (Long) target, start, end) != -1; 487bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 488bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 489bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor @Override public int indexOf(Object target) { 490bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor // Overridden to prevent a ton of boxing 491bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (target instanceof Long) { 492bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor int i = Longs.indexOf(array, (Long) target, start, end); 493bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (i >= 0) { 494bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return i - start; 495bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 496bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 497bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return -1; 498bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 499bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 500bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor @Override public int lastIndexOf(Object target) { 501bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor // Overridden to prevent a ton of boxing 502bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (target instanceof Long) { 503bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor int i = Longs.lastIndexOf(array, (Long) target, start, end); 504bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (i >= 0) { 505bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return i - start; 506bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 507bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 508bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return -1; 509bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 510bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 511bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor @Override public Long set(int index, Long element) { 512bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor checkElementIndex(index, size()); 513bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor long oldValue = array[start + index]; 5141d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert array[start + index] = checkNotNull(element); // checkNotNull for GWT (do not optimize) 515bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return oldValue; 516bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 517bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 5181d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert @Override public List<Long> subList(int fromIndex, int toIndex) { 519bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor int size = size(); 520bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor checkPositionIndexes(fromIndex, toIndex, size); 521bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (fromIndex == toIndex) { 522bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return Collections.emptyList(); 523bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 524bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return new LongArrayAsList(array, start + fromIndex, start + toIndex); 525bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 526bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 527bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor @Override public boolean equals(Object object) { 528bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (object == this) { 529bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return true; 530bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 531bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (object instanceof LongArrayAsList) { 532bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor LongArrayAsList that = (LongArrayAsList) object; 533bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor int size = size(); 534bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (that.size() != size) { 535bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return false; 536bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 537bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor for (int i = 0; i < size; i++) { 538bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (array[start + i] != that.array[that.start + i]) { 539bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return false; 540bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 541bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 542bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return true; 543bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 544bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return super.equals(object); 545bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 546bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 547bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor @Override public int hashCode() { 548bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor int result = 1; 549bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor for (int i = start; i < end; i++) { 550bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor result = 31 * result + Longs.hashCode(array[i]); 551bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 552bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return result; 553bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 554bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 555bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor @Override public String toString() { 556bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor StringBuilder builder = new StringBuilder(size() * 10); 557bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor builder.append('[').append(array[start]); 558bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor for (int i = start + 1; i < end; i++) { 559bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor builder.append(", ").append(array[i]); 560bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 561bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return builder.append(']').toString(); 562bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 563bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 564bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor long[] toLongArray() { 565bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor // Arrays.copyOfRange() requires Java 6 566bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor int size = size(); 567bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor long[] result = new long[size]; 568bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor System.arraycopy(array, start, result, 0, size); 569bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return result; 570bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 571bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 572bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor private static final long serialVersionUID = 0; 573bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 574bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor} 575