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 Bringertimport static java.lang.Double.NEGATIVE_INFINITY; 241d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport static java.lang.Double.POSITIVE_INFINITY; 251d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 26bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnorimport com.google.common.annotations.GwtCompatible; 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 37bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor/** 38bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Static utility methods pertaining to {@code double} primitives, that are not 39bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * already found in either {@link Double} or {@link Arrays}. 40bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 41bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @author Kevin Bourrillion 421d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * @since 1.0 43bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 44bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor@GwtCompatible 45bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnorpublic final class Doubles { 46bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor private Doubles() {} 47bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 48bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 491d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * The number of bytes required to represent a primitive {@code double} 501d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * value. 511d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * 521d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * @since 10.0 531d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert */ 541d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert public static final int BYTES = Double.SIZE / Byte.SIZE; 551d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 561d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert /** 57bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Returns a hash code for {@code value}; equal to the result of invoking 58bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * {@code ((Double) value).hashCode()}. 59bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 60bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param value a primitive {@code double} value 61bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @return a hash code for the value 62bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 63bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public static int hashCode(double value) { 64bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return ((Double) value).hashCode(); 651d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert // TODO(kevinb): do it this way when we can (GWT problem): 66bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor // long bits = Double.doubleToLongBits(value); 67bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor // return (int)(bits ^ (bits >>> 32)); 68bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 69bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 70bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 71bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Compares the two specified {@code double} values. The sign of the value 72bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * returned is the same as that of <code>((Double) a).{@linkplain 73bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Double#compareTo compareTo}(b)</code>. As with that method, {@code NaN} is 74bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * treated as greater than all other values, and {@code 0.0 > -0.0}. 75bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 76bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param a the first {@code double} to compare 77bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param b the second {@code double} to compare 78bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @return a negative value if {@code a} is less than {@code b}; a positive 79bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * value if {@code a} is greater than {@code b}; or zero if they are equal 80bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 81bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public static int compare(double a, double b) { 82bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return Double.compare(a, b); 83bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 84bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 85bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 861d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Returns {@code true} if {@code value} represents a real number. This is 871d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * equivalent to, but not necessarily implemented as, 881d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * {@code !(Double.isInfinite(value) || Double.isNaN(value))}. 891d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * 901d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * @since 10.0 911d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert */ 921d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert public static boolean isFinite(double value) { 931d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return NEGATIVE_INFINITY < value & value < POSITIVE_INFINITY; 941d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 951d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 961d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert /** 97bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Returns {@code true} if {@code target} is present as an element anywhere in 98bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * {@code array}. Note that this always returns {@code false} when {@code 99bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * target} is {@code NaN}. 100bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 101bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param array an array of {@code double} values, possibly empty 102bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param target a primitive {@code double} value 103bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @return {@code true} if {@code array[i] == target} for some value of {@code 104bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * i} 105bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 106bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public static boolean contains(double[] array, double target) { 107bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor for (double value : array) { 108bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (value == target) { 109bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return true; 110bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 111bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 112bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return false; 113bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 114bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 115bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 116bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Returns the index of the first appearance of the value {@code target} in 117bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * {@code array}. Note that this always returns {@code -1} when {@code target} 118bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * is {@code NaN}. 119bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 120bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param array an array of {@code double} values, possibly empty 121bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param target a primitive {@code double} value 122bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @return the least index {@code i} for which {@code array[i] == target}, or 123bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * {@code -1} if no such index exists. 124bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 125bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public static int indexOf(double[] array, double target) { 126bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return indexOf(array, target, 0, array.length); 127bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 128bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 1291d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert // TODO(kevinb): consider making this public 130bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor private static int indexOf( 131bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor double[] array, double target, int start, int end) { 132bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor for (int i = start; i < end; i++) { 133bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (array[i] == target) { 134bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return i; 135bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 136bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 137bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return -1; 138bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 139bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 140bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 141bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Returns the start position of the first occurrence of the specified {@code 142bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * target} within {@code array}, or {@code -1} if there is no such occurrence. 143bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 144bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * <p>More formally, returns the lowest index {@code i} such that {@code 145bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * java.util.Arrays.copyOfRange(array, i, i + target.length)} contains exactly 146bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * the same elements as {@code target}. 147bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 148bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * <p>Note that this always returns {@code -1} when {@code target} contains 149bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * {@code NaN}. 150bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 151bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param array the array to search for the sequence {@code target} 152bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param target the array to search for as a sub-sequence of {@code array} 153bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 154bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public static int indexOf(double[] array, double[] target) { 155bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor checkNotNull(array, "array"); 156bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor checkNotNull(target, "target"); 157bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (target.length == 0) { 158bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return 0; 159bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 160bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 161bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor outer: 162bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor for (int i = 0; i < array.length - target.length + 1; i++) { 163bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor for (int j = 0; j < target.length; j++) { 164bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (array[i + j] != target[j]) { 165bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor continue outer; 166bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 167bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 168bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return i; 169bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 170bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return -1; 171bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 172bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 173bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 174bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Returns the index of the last appearance of the value {@code target} in 175bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * {@code array}. Note that this always returns {@code -1} when {@code target} 176bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * is {@code NaN}. 177bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 178bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param array an array of {@code double} values, possibly empty 179bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param target a primitive {@code double} value 180bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @return the greatest index {@code i} for which {@code array[i] == target}, 181bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * or {@code -1} if no such index exists. 182bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 183bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public static int lastIndexOf(double[] array, double target) { 184bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return lastIndexOf(array, target, 0, array.length); 185bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 186bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 1871d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert // TODO(kevinb): consider making this public 188bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor private static int lastIndexOf( 189bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor double[] array, double target, int start, int end) { 190bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor for (int i = end - 1; i >= start; i--) { 191bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (array[i] == target) { 192bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return i; 193bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 194bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 195bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return -1; 196bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 197bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 198bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 199bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Returns the least value present in {@code array}, using the same rules of 200bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * comparison as {@link Math#min(double, double)}. 201bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 202bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param array a <i>nonempty</i> array of {@code double} values 203bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @return the value present in {@code array} that is less than or equal to 204bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * every other value in the array 205bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @throws IllegalArgumentException if {@code array} is empty 206bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 207bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public static double min(double... array) { 208bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor checkArgument(array.length > 0); 209bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor double min = array[0]; 210bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor for (int i = 1; i < array.length; i++) { 211bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor min = Math.min(min, array[i]); 212bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 213bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return min; 214bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 215bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 216bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 217bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Returns the greatest value present in {@code array}, using the same rules 218bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * of comparison as {@link Math#max(double, double)}. 219bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 220bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param array a <i>nonempty</i> array of {@code double} values 221bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @return the value present in {@code array} that is greater than or equal to 222bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * every other value in the array 223bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @throws IllegalArgumentException if {@code array} is empty 224bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 225bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public static double max(double... array) { 226bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor checkArgument(array.length > 0); 227bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor double max = array[0]; 228bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor for (int i = 1; i < array.length; i++) { 229bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor max = Math.max(max, array[i]); 230bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 231bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return max; 232bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 233bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 234bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 235bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Returns the values from each provided array combined into a single array. 236bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * For example, {@code concat(new double[] {a, b}, new double[] {}, new 237bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * double[] {c}} returns the array {@code {a, b, c}}. 238bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 239bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param arrays zero or more {@code double} arrays 240bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @return a single array containing all the values from the source arrays, in 241bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * order 242bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 243bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public static double[] concat(double[]... arrays) { 244bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor int length = 0; 245bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor for (double[] array : arrays) { 246bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor length += array.length; 247bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 248bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor double[] result = new double[length]; 249bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor int pos = 0; 250bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor for (double[] array : arrays) { 251bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor System.arraycopy(array, 0, result, pos, array.length); 252bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor pos += array.length; 253bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 254bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return result; 255bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 256bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 257bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 258bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Returns an array containing the same values as {@code array}, but 259bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * guaranteed to be of a specified minimum length. If {@code array} already 260bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * has a length of at least {@code minLength}, it is returned directly. 261bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Otherwise, a new array of size {@code minLength + padding} is returned, 262bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * containing the values of {@code array}, and zeroes in the remaining places. 263bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 264bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param array the source array 265bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param minLength the minimum length the returned array must guarantee 266bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param padding an extra amount to "grow" the array by if growth is 267bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * necessary 268bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @throws IllegalArgumentException if {@code minLength} or {@code padding} is 269bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * negative 270bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @return an array containing the values of {@code array}, with guaranteed 271bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * minimum length {@code minLength} 272bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 273bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public static double[] ensureCapacity( 274bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor double[] array, int minLength, int padding) { 275bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor checkArgument(minLength >= 0, "Invalid minLength: %s", minLength); 276bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor checkArgument(padding >= 0, "Invalid padding: %s", padding); 277bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return (array.length < minLength) 278bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor ? copyOf(array, minLength + padding) 279bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor : array; 280bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 281bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 282bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor // Arrays.copyOf() requires Java 6 283bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor private static double[] copyOf(double[] original, int length) { 284bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor double[] copy = new double[length]; 285bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor System.arraycopy(original, 0, copy, 0, Math.min(original.length, length)); 286bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return copy; 287bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 288bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 289bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 290bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Returns a string containing the supplied {@code double} values, converted 291bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * to strings as specified by {@link Double#toString(double)}, and separated 292bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * by {@code separator}. For example, {@code join("-", 1.0, 2.0, 3.0)} returns 293bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * the string {@code "1.0-2.0-3.0"}. 294bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 2951d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * <p>Note that {@link Double#toString(double)} formats {@code double} 2961d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * differently in GWT sometimes. In the previous example, it returns the string 2971d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * {@code "1-2-3"}. 2981d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * 299bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param separator the text that should appear between consecutive values in 300bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * the resulting string (but not at the start or end) 301bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param array an array of {@code double} values, possibly empty 302bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 303bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public static String join(String separator, double... array) { 304bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor checkNotNull(separator); 305bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (array.length == 0) { 306bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return ""; 307bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 308bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 309bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor // For pre-sizing a builder, just get the right order of magnitude 310bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor StringBuilder builder = new StringBuilder(array.length * 12); 311bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor builder.append(array[0]); 312bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor for (int i = 1; i < array.length; i++) { 313bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor builder.append(separator).append(array[i]); 314bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 315bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return builder.toString(); 316bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 317bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 318bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 319bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Returns a comparator that compares two {@code double} arrays 320bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * lexicographically. That is, it compares, using {@link 321bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * #compare(double, double)}), the first pair of values that follow any 322bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * common prefix, or when one array is a prefix of the other, treats the 323bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * shorter array as the lesser. For example, 324bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * {@code [] < [1.0] < [1.0, 2.0] < [2.0]}. 325bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 326bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * <p>The returned comparator is inconsistent with {@link 327bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Object#equals(Object)} (since arrays support only identity equality), but 328bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * it is consistent with {@link Arrays#equals(double[], double[])}. 329bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 330bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @see <a href="http://en.wikipedia.org/wiki/Lexicographical_order"> 3311d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Lexicographical order article at Wikipedia</a> 3321d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * @since 2.0 333bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 334bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public static Comparator<double[]> lexicographicalComparator() { 335bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return LexicographicalComparator.INSTANCE; 336bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 337bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 338bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor private enum LexicographicalComparator implements Comparator<double[]> { 339bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor INSTANCE; 340bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 3411d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert @Override 342bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public int compare(double[] left, double[] right) { 343bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor int minLength = Math.min(left.length, right.length); 344bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor for (int i = 0; i < minLength; i++) { 345bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor int result = Doubles.compare(left[i], right[i]); 346bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (result != 0) { 347bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return result; 348bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 349bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 350bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return left.length - right.length; 351bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 352bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 353bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 354bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 355bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Copies a collection of {@code Double} instances into a new array of 356bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * primitive {@code double} values. 357bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 358bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * <p>Elements are copied from the argument collection as if by {@code 359bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * collection.toArray()}. Calling this method is as thread-safe as calling 360bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * that method. 361bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 362bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param collection a collection of {@code Double} objects 363bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @return an array containing the same values as {@code collection}, in the 364bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * same order, converted to primitives 365bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @throws NullPointerException if {@code collection} or any of its elements 366bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * is null 367bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 368bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public static double[] toArray(Collection<Double> collection) { 369bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (collection instanceof DoubleArrayAsList) { 370bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return ((DoubleArrayAsList) collection).toDoubleArray(); 371bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 372bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 373bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor Object[] boxedArray = collection.toArray(); 374bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor int len = boxedArray.length; 375bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor double[] array = new double[len]; 376bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor for (int i = 0; i < len; i++) { 3771d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert // checkNotNull for GWT (do not optimize) 3781d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert array[i] = (Double) checkNotNull(boxedArray[i]); 379bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 380bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return array; 381bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 382bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 383bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor /** 384bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Returns a fixed-size list backed by the specified array, similar to {@link 385bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * Arrays#asList(Object[])}. The list supports {@link List#set(int, Object)}, 386bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * but any attempt to set a value to {@code null} will result in a {@link 387bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * NullPointerException}. 388bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 389bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * <p>The returned list maintains the values, but not the identities, of 390bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * {@code Double} objects written to or read from it. For example, whether 391bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * {@code list.get(0) == list.get(0)} is true for the returned list is 392bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * unspecified. 393bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 394bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * <p>The returned list may have unexpected behavior if it contains {@code 395bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * NaN}, or if {@code NaN} is used as a parameter to any of its methods. 396bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * 397bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @param backingArray the array to back the list 398bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor * @return a list view of the array 399bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor */ 400bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor public static List<Double> asList(double... backingArray) { 401bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (backingArray.length == 0) { 402bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return Collections.emptyList(); 403bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 404bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return new DoubleArrayAsList(backingArray); 405bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 406bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 407bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor @GwtCompatible 408bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor private static class DoubleArrayAsList extends AbstractList<Double> 409bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor implements RandomAccess, Serializable { 410bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor final double[] array; 411bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor final int start; 412bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor final int end; 413bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 414bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor DoubleArrayAsList(double[] array) { 415bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor this(array, 0, array.length); 416bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 417bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 418bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor DoubleArrayAsList(double[] array, int start, int end) { 419bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor this.array = array; 420bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor this.start = start; 421bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor this.end = end; 422bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 423bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 424bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor @Override public int size() { 425bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return end - start; 426bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 427bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 428bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor @Override public boolean isEmpty() { 429bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return false; 430bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 431bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 432bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor @Override public Double get(int index) { 433bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor checkElementIndex(index, size()); 434bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return array[start + index]; 435bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 436bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 437bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor @Override public boolean contains(Object target) { 438bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor // Overridden to prevent a ton of boxing 439bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return (target instanceof Double) 440bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor && Doubles.indexOf(array, (Double) target, start, end) != -1; 441bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 442bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 443bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor @Override public int indexOf(Object target) { 444bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor // Overridden to prevent a ton of boxing 445bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (target instanceof Double) { 446bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor int i = Doubles.indexOf(array, (Double) target, start, end); 447bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (i >= 0) { 448bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return i - start; 449bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 450bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 451bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return -1; 452bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 453bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 454bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor @Override public int lastIndexOf(Object target) { 455bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor // Overridden to prevent a ton of boxing 456bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (target instanceof Double) { 457bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor int i = Doubles.lastIndexOf(array, (Double) target, start, end); 458bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (i >= 0) { 459bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return i - start; 460bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 461bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 462bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return -1; 463bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 464bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 465bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor @Override public Double set(int index, Double element) { 466bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor checkElementIndex(index, size()); 467bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor double oldValue = array[start + index]; 4681d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert array[start + index] = checkNotNull(element); // checkNotNull for GWT (do not optimize) 469bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return oldValue; 470bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 471bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 4721d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert @Override public List<Double> subList(int fromIndex, int toIndex) { 473bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor int size = size(); 474bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor checkPositionIndexes(fromIndex, toIndex, size); 475bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (fromIndex == toIndex) { 476bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return Collections.emptyList(); 477bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 478bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return new DoubleArrayAsList(array, start + fromIndex, start + toIndex); 479bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 480bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 481bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor @Override public boolean equals(Object object) { 482bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (object == this) { 483bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return true; 484bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 485bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (object instanceof DoubleArrayAsList) { 486bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor DoubleArrayAsList that = (DoubleArrayAsList) object; 487bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor int size = size(); 488bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (that.size() != size) { 489bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return false; 490bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 491bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor for (int i = 0; i < size; i++) { 492bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor if (array[start + i] != that.array[that.start + i]) { 493bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return false; 494bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 495bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 496bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return true; 497bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 498bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return super.equals(object); 499bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 500bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 501bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor @Override public int hashCode() { 502bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor int result = 1; 503bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor for (int i = start; i < end; i++) { 504bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor result = 31 * result + Doubles.hashCode(array[i]); 505bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 506bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return result; 507bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 508bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 509bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor @Override public String toString() { 510bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor StringBuilder builder = new StringBuilder(size() * 12); 511bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor builder.append('[').append(array[start]); 512bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor for (int i = start + 1; i < end; i++) { 513bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor builder.append(", ").append(array[i]); 514bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 515bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return builder.append(']').toString(); 516bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 517bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 518bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor double[] toDoubleArray() { 519bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor // Arrays.copyOfRange() requires Java 6 520bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor int size = size(); 521bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor double[] result = new double[size]; 522bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor System.arraycopy(array, start, result, 0, size); 523bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor return result; 524bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 525bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor 526bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor private static final long serialVersionUID = 0; 527bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor } 528bfe2dd089341dcb4c1fb65a5b6b077ad0ebbf6dcDan Egnor} 529