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/*
* Copyright 2010-2016 JetBrains s.r.o.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
@file:kotlin.jvm.JvmMultifileClass
@file:kotlin.jvm.JvmName("CollectionsKt")
package kotlin.collections
import java.io.Serializable
import java.util.*
import kotlin.comparisons.compareValues
internal object EmptyIterator : ListIterator {
override fun hasNext(): Boolean = false
override fun hasPrevious(): Boolean = false
override fun nextIndex(): Int = 0
override fun previousIndex(): Int = -1
override fun next(): Nothing = throw NoSuchElementException()
override fun previous(): Nothing = throw NoSuchElementException()
}
internal object EmptyList : List, Serializable, RandomAccess {
private const val serialVersionUID: Long = -7390468764508069838L
override fun equals(other: Any?): Boolean = other is List<*> && other.isEmpty()
override fun hashCode(): Int = 1
override fun toString(): String = "[]"
override val size: Int get() = 0
override fun isEmpty(): Boolean = true
override fun contains(element: Nothing): Boolean = false
override fun containsAll(elements: Collection): Boolean = elements.isEmpty()
override fun get(index: Int): Nothing = throw IndexOutOfBoundsException("Empty list doesn't contain element at index $index.")
override fun indexOf(element: Nothing): Int = -1
override fun lastIndexOf(element: Nothing): Int = -1
override fun iterator(): Iterator = EmptyIterator
override fun listIterator(): ListIterator = EmptyIterator
override fun listIterator(index: Int): ListIterator {
if (index != 0) throw IndexOutOfBoundsException("Index: $index")
return EmptyIterator
}
override fun subList(fromIndex: Int, toIndex: Int): List {
if (fromIndex == 0 && toIndex == 0) return this
throw IndexOutOfBoundsException("fromIndex: $fromIndex, toIndex: $toIndex")
}
private fun readResolve(): Any = EmptyList
}
internal fun Array.asCollection(): Collection = ArrayAsCollection(this, isVarargs = false)
private class ArrayAsCollection(val values: Array, val isVarargs: Boolean): Collection {
override val size: Int get() = values.size
override fun isEmpty(): Boolean = values.isEmpty()
override fun contains(element: T): Boolean = values.contains(element)
override fun containsAll(elements: Collection): Boolean = elements.all { contains(it) }
override fun iterator(): Iterator = values.iterator()
// override hidden toArray implementation to prevent copying of values array
public fun toArray(): Array = values.copyToArrayOfAny(isVarargs)
}
/** Returns an empty read-only list. The returned list is serializable (JVM). */
public fun emptyList(): List = EmptyList
/** Returns a new read-only list of given elements. The returned list is serializable (JVM). */
public fun listOf(vararg elements: T): List = if (elements.size > 0) elements.asList() else emptyList()
/** Returns an empty read-only list. The returned list is serializable (JVM). */
@kotlin.internal.InlineOnly
public inline fun listOf(): List = emptyList()
/* Not available on platform: JS */
/** Returns a new [MutableList] with the given elements. */
public fun mutableListOf(vararg elements: T): MutableList
= if (elements.size == 0) ArrayList() else ArrayList(ArrayAsCollection(elements, isVarargs = true))
/** Returns a new [ArrayList] with the given elements. */
public fun arrayListOf(vararg elements: T): ArrayList
= if (elements.size == 0) ArrayList() else ArrayList(ArrayAsCollection(elements, isVarargs = true))
/** Returns a new read-only list either of single given element, if it is not null, or empty list it the element is null. The returned list is serializable (JVM). */
public fun listOfNotNull(element: T?): List = if (element != null) listOf(element) else emptyList()
/** Returns a new read-only list only of those given elements, that are not null. The returned list is serializable (JVM). */
public fun listOfNotNull(vararg elements: T?): List = elements.filterNotNull()
/**
* Returns an [IntRange] of the valid indices for this collection.
*/
public val Collection<*>.indices: IntRange
get() = 0..size - 1
/**
* Returns the index of the last item in the list or -1 if the list is empty.
*
* @sample test.collections.ListSpecificTest.lastIndex
*/
public val List.lastIndex: Int
get() = this.size - 1
/** Returns `true` if the collection is not empty. */
@kotlin.internal.InlineOnly
public inline fun Collection.isNotEmpty(): Boolean = !isEmpty()
/** Returns this Collection if it's not `null` and the empty list otherwise. */
@kotlin.internal.InlineOnly
public inline fun Collection?.orEmpty(): Collection = this ?: emptyList()
/** Returns this List if it's not `null` and the empty list otherwise. */
@kotlin.internal.InlineOnly
public inline fun List?.orEmpty(): List = this ?: emptyList()
/* Not available on platform: JS */
/**
* Checks if all elements in the specified collection are contained in this collection.
*
* Allows to overcome type-safety restriction of `containsAll` that requires to pass a collection of type `Collection`.
*/
@kotlin.internal.InlineOnly
public inline fun <@kotlin.internal.OnlyInputTypes T> Collection.containsAll(elements: Collection): Boolean = this.containsAll(elements)
internal fun List.optimizeReadOnlyList() = when (size) {
0 -> emptyList()
1 -> listOf(this[0])
else -> this
}
/* Not available on platform: JS */
/**
* Searches this list or its range for the provided [element] using the binary search algorithm.
* The list is expected to be sorted into ascending order according to the Comparable natural ordering of its elements,
* otherwise the result is undefined.
*
* If the list contains multiple elements equal to the specified [element], there is no guarantee which one will be found.
*
* `null` value is considered to be less than any non-null value.
*
* @return the index of the element, if it is contained in the list within the specified range;
* otherwise, the inverted insertion point `(-insertion point - 1)`.
* The insertion point is defined as the index at which the element should be inserted,
* so that the list (or the specified subrange of list) still remains sorted.
*/
public fun > List.binarySearch(element: T?, fromIndex: Int = 0, toIndex: Int = size): Int {
rangeCheck(size, fromIndex, toIndex)
var low = fromIndex
var high = toIndex - 1
while (low <= high) {
val mid = (low + high).ushr(1) // safe from overflows
val midVal = get(mid)
val cmp = compareValues(midVal, element)
if (cmp < 0)
low = mid + 1
else if (cmp > 0)
high = mid - 1
else
return mid // key found
}
return -(low + 1) // key not found
}
/**
* Searches this list or its range for the provided [element] using the binary search algorithm.
* The list is expected to be sorted into ascending order according to the specified [comparator],
* otherwise the result is undefined.
*
* If the list contains multiple elements equal to the specified [element], there is no guarantee which one will be found.
*
* `null` value is considered to be less than any non-null value.
*
* @return the index of the element, if it is contained in the list within the specified range;
* otherwise, the inverted insertion point `(-insertion point - 1)`.
* The insertion point is defined as the index at which the element should be inserted,
* so that the list (or the specified subrange of list) still remains sorted according to the specified [comparator].
*/
public fun List.binarySearch(element: T, comparator: Comparator, fromIndex: Int = 0, toIndex: Int = size): Int {
rangeCheck(size, fromIndex, toIndex)
var low = fromIndex
var high = toIndex - 1
while (low <= high) {
val mid = (low + high).ushr(1) // safe from overflows
val midVal = get(mid)
val cmp = comparator.compare(midVal, element)
if (cmp < 0)
low = mid + 1
else if (cmp > 0)
high = mid - 1
else
return mid // key found
}
return -(low + 1) // key not found
}
/**
* Searches this list or its range for an element having the key returned by the specified [selector] function
* equal to the provided [key] value using the binary search algorithm.
* The list is expected to be sorted into ascending order according to the Comparable natural ordering of keys of its elements.
* otherwise the result is undefined.
*
* If the list contains multiple elements with the specified [key], there is no guarantee which one will be found.
*
* `null` value is considered to be less than any non-null value.
*
* @return the index of the element with the specified [key], if it is contained in the list within the specified range;
* otherwise, the inverted insertion point `(-insertion point - 1)`.
* The insertion point is defined as the index at which the element should be inserted,
* so that the list (or the specified subrange of list) still remains sorted.
*/
public inline fun > List.binarySearchBy(key: K?, fromIndex: Int = 0, toIndex: Int = size, crossinline selector: (T) -> K?): Int =
binarySearch(fromIndex, toIndex) { compareValues(selector(it), key) }
// do not introduce this overload --- too rare
//public fun List.binarySearchBy(key: K, comparator: Comparator, fromIndex: Int = 0, toIndex: Int = size(), selector: (T) -> K): Int =
// binarySearch(fromIndex, toIndex) { comparator.compare(selector(it), key) }
/**
* Searches this list or its range for an element for which [comparison] function returns zero using the binary search algorithm.
* The list is expected to be sorted into ascending order according to the provided [comparison],
* otherwise the result is undefined.
*
* If the list contains multiple elements for which [comparison] returns zero, there is no guarantee which one will be found.
*
* @param comparison function that compares an element of the list with the element being searched.
*
* @return the index of the found element, if it is contained in the list within the specified range;
* otherwise, the inverted insertion point `(-insertion point - 1)`.
* The insertion point is defined as the index at which the element should be inserted,
* so that the list (or the specified subrange of list) still remains sorted.
*/
public fun List.binarySearch(fromIndex: Int = 0, toIndex: Int = size, comparison: (T) -> Int): Int {
rangeCheck(size, fromIndex, toIndex)
var low = fromIndex
var high = toIndex - 1
while (low <= high) {
val mid = (low + high).ushr(1) // safe from overflows
val midVal = get(mid)
val cmp = comparison(midVal)
if (cmp < 0)
low = mid + 1
else if (cmp > 0)
high = mid - 1
else
return mid // key found
}
return -(low + 1) // key not found
}
/**
* Checks that `from` and `to` are in
* the range of [0..size] and throws an appropriate exception, if they aren't.
*/
private fun rangeCheck(size: Int, fromIndex: Int, toIndex: Int) {
when {
fromIndex > toIndex -> throw IllegalArgumentException("fromIndex ($fromIndex) is greater than toIndex ($toIndex).")
fromIndex < 0 -> throw IndexOutOfBoundsException("fromIndex ($fromIndex) is less than zero.")
toIndex > size -> throw IndexOutOfBoundsException("toIndex ($toIndex) is greater than size ($size).")
}
}
