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scala.collection.immutable.Map.scala Maven / Gradle / Ivy
/*
* Scala (https://www.scala-lang.org)
*
* Copyright EPFL and Lightbend, Inc.
*
* Licensed under Apache License 2.0
* (http://www.apache.org/licenses/LICENSE-2.0).
*
* See the NOTICE file distributed with this work for
* additional information regarding copyright ownership.
*/
package scala
package collection
package immutable
import scala.annotation.unchecked.uncheckedVariance
import scala.collection.generic.DefaultSerializable
import scala.collection.immutable.Map.Map4
import scala.collection.mutable.{Builder, ReusableBuilder}
/** Base type of immutable Maps */
trait Map[K, +V]
extends Iterable[(K, V)]
with collection.Map[K, V]
with MapOps[K, V, Map, Map[K, V]]
with MapFactoryDefaults[K, V, Map, Iterable] {
override def mapFactory: scala.collection.MapFactory[Map] = Map
override final def toMap[K2, V2](implicit ev: (K, V) <:< (K2, V2)): Map[K2, V2] = this.asInstanceOf[Map[K2, V2]]
/** The same map with a given default function.
* Note: The default is only used for `apply`. Other methods like `get`, `contains`, `iterator`, `keys`, etc.
* are not affected by `withDefault`.
*
* Invoking transformer methods (e.g. `map`) will not preserve the default value.
*
* @param d the function mapping keys to values, used for non-present keys
* @return a wrapper of the map with a default value
*/
def withDefault[V1 >: V](d: K => V1): Map[K, V1] = new Map.WithDefault[K, V1](this, d)
/** The same map with a given default value.
* Note: The default is only used for `apply`. Other methods like `get`, `contains`, `iterator`, `keys`, etc.
* are not affected by `withDefaultValue`.
*
* Invoking transformer methods (e.g. `map`) will not preserve the default value.
*
* @param d default value used for non-present keys
* @return a wrapper of the map with a default value
*/
def withDefaultValue[V1 >: V](d: V1): Map[K, V1] = new Map.WithDefault[K, V1](this, _ => d)
}
/** Base trait of immutable Maps implementations
*
* @define coll immutable map
* @define Coll `immutable.Map`
*/
trait MapOps[K, +V, +CC[X, +Y] <: MapOps[X, Y, CC, _], +C <: MapOps[K, V, CC, C]]
extends IterableOps[(K, V), Iterable, C]
with collection.MapOps[K, V, CC, C] {
protected def coll: C with CC[K, V]
/** Removes a key from this map, returning a new map.
*
* @param key the key to be removed
* @return a new map without a binding for ''key''
*/
def removed(key: K): C
/** Alias for `removed` */
@`inline` final def - (key: K): C = removed(key)
@deprecated("Use -- with an explicit collection", "2.13.0")
def - (key1: K, key2: K, keys: K*): C = removed(key1).removed(key2).removedAll(keys)
/** Creates a new $coll from this $coll by removing all elements of another
* collection.
*
* $willForceEvaluation
*
* @param keys the collection containing the removed elements.
* @return a new $coll that contains all elements of the current $coll
* except one less occurrence of each of the elements of `elems`.
*/
def removedAll(keys: IterableOnce[K]): C = keys.iterator.foldLeft[C](coll)(_ - _)
/** Alias for `removedAll` */
@`inline` final override def -- (keys: IterableOnce[K]): C = removedAll(keys)
/** Creates a new map obtained by updating this map with a given key/value pair.
* @param key the key
* @param value the value
* @tparam V1 the type of the added value
* @return A new map with the new key/value mapping added to this map.
*
* @inheritdoc
*/
def updated[V1 >: V](key: K, value: V1): CC[K, V1]
/**
* Update a mapping for the specified key and its current optionally-mapped value
* (`Some` if there is current mapping, `None` if not).
*
* If the remapping function returns `Some(v)`, the mapping is updated with the new value `v`.
* If the remapping function returns `None`, the mapping is removed (or remains absent if initially absent).
* If the function itself throws an exception, the exception is rethrown, and the current mapping is left unchanged.
*
* @param key the key value
* @param remappingFunction a partial function that receives current optionally-mapped value and return a new mapping
* @return A new map with the updated mapping with the key
*/
def updatedWith[V1 >: V](key: K)(remappingFunction: Option[V] => Option[V1]): CC[K,V1] = {
val previousValue = this.get(key)
val nextValue = remappingFunction(previousValue)
(previousValue, nextValue) match {
case (None, None) => coll
case (Some(_), None) => this.removed(key).coll
case (_, Some(v)) => this.updated(key, v)
}
}
/**
* Alias for `updated`
*
* @param kv the key/value pair.
* @tparam V1 the type of the value in the key/value pair.
* @return A new map with the new binding added to this map.
*/
override def + [V1 >: V](kv: (K, V1)): CC[K, V1] = updated(kv._1, kv._2)
/** This function transforms all the values of mappings contained
* in this map with function `f`.
*
* @param f A function over keys and values
* @return the updated map
*/
def transform[W](f: (K, V) => W): CC[K, W] = map { case (k, v) => (k, f(k, v)) }
override def keySet: Set[K] = new ImmutableKeySet
/** The implementation class of the set returned by `keySet` */
protected class ImmutableKeySet extends AbstractSet[K] with GenKeySet with DefaultSerializable {
def incl(elem: K): Set[K] = if (this(elem)) this else empty ++ this + elem
def excl(elem: K): Set[K] = if (this(elem)) empty ++ this - elem else this
}
}
trait StrictOptimizedMapOps[K, +V, +CC[X, +Y] <: MapOps[X, Y, CC, _], +C <: MapOps[K, V, CC, C]]
extends MapOps[K, V, CC, C]
with collection.StrictOptimizedMapOps[K, V, CC, C]
with StrictOptimizedIterableOps[(K, V), Iterable, C] {
override def concat [V1 >: V](that: collection.IterableOnce[(K, V1)]): CC[K, V1] = {
var result: CC[K, V1] = coll
val it = that.iterator
while (it.hasNext) result = result + it.next()
result
}
}
/**
* $factoryInfo
* @define coll immutable map
* @define Coll `immutable.Map`
*/
@SerialVersionUID(3L)
object Map extends MapFactory[Map] {
@SerialVersionUID(3L)
class WithDefault[K, +V](val underlying: Map[K, V], val defaultValue: K => V)
extends AbstractMap[K, V]
with MapOps[K, V, Map, WithDefault[K, V]] with Serializable {
def get(key: K): Option[V] = underlying.get(key)
override def default(key: K): V = defaultValue(key)
override def iterableFactory: IterableFactory[Iterable] = underlying.iterableFactory
def iterator: Iterator[(K, V)] = underlying.iterator
override def isEmpty: Boolean = underlying.isEmpty
override def mapFactory: MapFactory[Map] = underlying.mapFactory
override def concat [V2 >: V](xs: collection.IterableOnce[(K, V2)]): WithDefault[K, V2] =
new WithDefault(underlying.concat(xs), defaultValue)
def removed(key: K): WithDefault[K, V] = new WithDefault[K, V](underlying.removed(key), defaultValue)
def updated[V1 >: V](key: K, value: V1): WithDefault[K, V1] =
new WithDefault[K, V1](underlying.updated(key, value), defaultValue)
override def empty: WithDefault[K, V] = new WithDefault[K, V](underlying.empty, defaultValue)
override protected def fromSpecific(coll: collection.IterableOnce[(K, V)] @uncheckedVariance): WithDefault[K, V] =
new WithDefault[K, V](mapFactory.from(coll), defaultValue)
override protected def newSpecificBuilder: Builder[(K, V), WithDefault[K, V]] @uncheckedVariance =
Map.newBuilder.mapResult((p: Map[K, V]) => new WithDefault[K, V](p, defaultValue))
}
def empty[K, V]: Map[K, V] = EmptyMap.asInstanceOf[Map[K, V]]
def from[K, V](it: collection.IterableOnce[(K, V)]): Map[K, V] =
it match {
case it: Iterable[_] if it.isEmpty => empty[K, V]
case m: Map[K, V] => m
case _ => (newBuilder[K, V] ++= it).result()
}
def newBuilder[K, V]: Builder[(K, V), Map[K, V]] = new MapBuilderImpl
@SerialVersionUID(3L)
private object EmptyMap extends AbstractMap[Any, Nothing] with Serializable {
override def size: Int = 0
override def knownSize: Int = 0
override def isEmpty: Boolean = true
override def apply(key: Any) = throw new NoSuchElementException("key not found: " + key)
override def contains(key: Any) = false
def get(key: Any): Option[Nothing] = None
override def getOrElse [V1](key: Any, default: => V1): V1 = default
def iterator: Iterator[(Any, Nothing)] = Iterator.empty
override def keysIterator: Iterator[Any] = Iterator.empty
override def valuesIterator: Iterator[Nothing] = Iterator.empty
def updated [V1] (key: Any, value: V1): Map[Any, V1] = new Map1(key, value)
def removed(key: Any): Map[Any, Nothing] = this
override def concat[V2 >: Nothing](suffix: IterableOnce[(Any, V2)]): Map[Any, V2] = suffix match {
case m: immutable.Map[Any, V2] => m
case _ => super.concat(suffix)
}
}
@SerialVersionUID(3L)
final class Map1[K, +V](key1: K, value1: V) extends AbstractMap[K, V] with StrictOptimizedIterableOps[(K, V), Iterable, Map[K, V]] with Serializable {
override def size: Int = 1
override def knownSize: Int = 1
override def isEmpty: Boolean = false
override def apply(key: K): V = if (key == key1) value1 else throw new NoSuchElementException("key not found: " + key)
override def contains(key: K): Boolean = key == key1
def get(key: K): Option[V] =
if (key == key1) Some(value1) else None
override def getOrElse [V1 >: V](key: K, default: => V1): V1 =
if (key == key1) value1 else default
def iterator: Iterator[(K, V)] = Iterator.single((key1, value1))
override def keysIterator: Iterator[K] = Iterator.single(key1)
override def valuesIterator: Iterator[V] = Iterator.single(value1)
def updated[V1 >: V](key: K, value: V1): Map[K, V1] =
if (key == key1) new Map1(key1, value)
else new Map2(key1, value1, key, value)
def removed(key: K): Map[K, V] =
if (key == key1) Map.empty else this
override def foreach[U](f: ((K, V)) => U): Unit = {
f((key1, value1))
}
override def exists(p: ((K, V)) => Boolean): Boolean = p((key1, value1))
override def forall(p: ((K, V)) => Boolean): Boolean = p((key1, value1))
override protected[collection] def filterImpl(pred: ((K, V)) => Boolean, isFlipped: Boolean): Map[K, V] =
if (pred((key1, value1)) != isFlipped) this else Map.empty
override def transform[W](f: (K, V) => W): Map[K, W] = {
val walue1 = f(key1, value1)
if (walue1.asInstanceOf[AnyRef] eq value1.asInstanceOf[AnyRef]) this.asInstanceOf[Map[K, W]]
else new Map1(key1, walue1)
}
override def hashCode(): Int = {
import scala.util.hashing.MurmurHash3
var a, b = 0
val N = 1
var c = 1
var h = MurmurHash3.tuple2Hash(key1, value1)
a += h
b ^= h
c *= h | 1
h = MurmurHash3.mapSeed
h = MurmurHash3.mix(h, a)
h = MurmurHash3.mix(h, b)
h = MurmurHash3.mixLast(h, c)
MurmurHash3.finalizeHash(h, N)
}
}
@SerialVersionUID(3L)
final class Map2[K, +V](key1: K, value1: V, key2: K, value2: V) extends AbstractMap[K, V] with StrictOptimizedIterableOps[(K, V), Iterable, Map[K, V]] with Serializable {
override def size: Int = 2
override def knownSize: Int = 2
override def isEmpty: Boolean = false
override def apply(key: K): V =
if (key == key1) value1
else if (key == key2) value2
else throw new NoSuchElementException("key not found: " + key)
override def contains(key: K): Boolean = (key == key1) || (key == key2)
def get(key: K): Option[V] =
if (key == key1) Some(value1)
else if (key == key2) Some(value2)
else None
override def getOrElse [V1 >: V](key: K, default: => V1): V1 =
if (key == key1) value1
else if (key == key2) value2
else default
def iterator: Iterator[(K, V)] = new Map2Iterator[(K, V)] {
override protected def nextResult(k: K, v: V): (K, V) = (k, v)
}
override def keysIterator: Iterator[K] = new Map2Iterator[K] {
override protected def nextResult(k: K, v: V): K = k
}
override def valuesIterator: Iterator[V] = new Map2Iterator[V] {
override protected def nextResult(k: K, v: V): V = v
}
private abstract class Map2Iterator[A] extends AbstractIterator[A] {
private[this] var i = 0
override def hasNext: Boolean = i < 2
override def next(): A = {
val result = i match {
case 0 => nextResult(key1, value1)
case 1 => nextResult(key2, value2)
case _ => Iterator.empty.next()
}
i += 1
result
}
override def drop(n: Int): Iterator[A] = { i += n; this }
protected def nextResult(k: K, v: V @uncheckedVariance): A
}
def updated[V1 >: V](key: K, value: V1): Map[K, V1] =
if (key == key1) new Map2(key1, value, key2, value2)
else if (key == key2) new Map2(key1, value1, key2, value)
else new Map3(key1, value1, key2, value2, key, value)
def removed(key: K): Map[K, V] =
if (key == key1) new Map1(key2, value2)
else if (key == key2) new Map1(key1, value1)
else this
override def foreach[U](f: ((K, V)) => U): Unit = {
f((key1, value1)); f((key2, value2))
}
override def exists(p: ((K, V)) => Boolean): Boolean = p((key1, value1)) || p((key2, value2))
override def forall(p: ((K, V)) => Boolean): Boolean = p((key1, value1)) && p((key2, value2))
override protected[collection] def filterImpl(pred: ((K, V)) => Boolean, isFlipped: Boolean): Map[K, V] = {
var k1 = null.asInstanceOf[K]
var v1 = null.asInstanceOf[V]
var n = 0
if (pred((key1, value1)) != isFlipped) { {k1 = key1; v1 = value1}; n += 1}
if (pred((key2, value2)) != isFlipped) { if (n == 0) {k1 = key2; v1 = value2}; n += 1}
n match {
case 0 => Map.empty
case 1 => new Map1(k1, v1)
case 2 => this
}
}
override def transform[W](f: (K, V) => W): Map[K, W] = {
val walue1 = f(key1, value1)
val walue2 = f(key2, value2)
if ((walue1.asInstanceOf[AnyRef] eq value1.asInstanceOf[AnyRef]) &&
(walue2.asInstanceOf[AnyRef] eq value2.asInstanceOf[AnyRef])) this.asInstanceOf[Map[K, W]]
else new Map2(key1, walue1, key2, walue2)
}
override def hashCode(): Int = {
import scala.util.hashing.MurmurHash3
var a, b = 0
val N = 2
var c = 1
var h = MurmurHash3.tuple2Hash(key1, value1)
a += h
b ^= h
c *= h | 1
h = MurmurHash3.tuple2Hash(key2, value2)
a += h
b ^= h
c *= h | 1
h = MurmurHash3.mapSeed
h = MurmurHash3.mix(h, a)
h = MurmurHash3.mix(h, b)
h = MurmurHash3.mixLast(h, c)
MurmurHash3.finalizeHash(h, N)
}
}
@SerialVersionUID(3L)
class Map3[K, +V](key1: K, value1: V, key2: K, value2: V, key3: K, value3: V) extends AbstractMap[K, V] with StrictOptimizedIterableOps[(K, V), Iterable, Map[K, V]] with Serializable {
override def size: Int = 3
override def knownSize: Int = 3
override def isEmpty: Boolean = false
override def apply(key: K): V =
if (key == key1) value1
else if (key == key2) value2
else if (key == key3) value3
else throw new NoSuchElementException("key not found: " + key)
override def contains(key: K): Boolean = (key == key1) || (key == key2) || (key == key3)
def get(key: K): Option[V] =
if (key == key1) Some(value1)
else if (key == key2) Some(value2)
else if (key == key3) Some(value3)
else None
override def getOrElse [V1 >: V](key: K, default: => V1): V1 =
if (key == key1) value1
else if (key == key2) value2
else if (key == key3) value3
else default
def iterator: Iterator[(K, V)] = new Map3Iterator[(K, V)] {
override protected def nextResult(k: K, v: V): (K, V) = (k, v)
}
override def keysIterator: Iterator[K] = new Map3Iterator[K] {
override protected def nextResult(k: K, v: V): K = k
}
override def valuesIterator: Iterator[V] = new Map3Iterator[V] {
override protected def nextResult(k: K, v: V): V = v
}
private abstract class Map3Iterator[A] extends AbstractIterator[A] {
private[this] var i = 0
override def hasNext: Boolean = i < 3
override def next(): A = {
val result = i match {
case 0 => nextResult(key1, value1)
case 1 => nextResult(key2, value2)
case 2 => nextResult(key3, value3)
case _ => Iterator.empty.next()
}
i += 1
result
}
override def drop(n: Int): Iterator[A] = { i += n; this }
protected def nextResult(k: K, v: V @uncheckedVariance): A
}
def updated[V1 >: V](key: K, value: V1): Map[K, V1] =
if (key == key1) new Map3(key1, value, key2, value2, key3, value3)
else if (key == key2) new Map3(key1, value1, key2, value, key3, value3)
else if (key == key3) new Map3(key1, value1, key2, value2, key3, value)
else new Map4(key1, value1, key2, value2, key3, value3, key, value)
def removed(key: K): Map[K, V] =
if (key == key1) new Map2(key2, value2, key3, value3)
else if (key == key2) new Map2(key1, value1, key3, value3)
else if (key == key3) new Map2(key1, value1, key2, value2)
else this
override def foreach[U](f: ((K, V)) => U): Unit = {
f((key1, value1)); f((key2, value2)); f((key3, value3))
}
override def exists(p: ((K, V)) => Boolean): Boolean = p((key1, value1)) || p((key2, value2)) || p((key3, value3))
override def forall(p: ((K, V)) => Boolean): Boolean = p((key1, value1)) && p((key2, value2)) && p((key3, value3))
override protected[collection] def filterImpl(pred: ((K, V)) => Boolean, isFlipped: Boolean): Map[K, V] = {
var k1, k2 = null.asInstanceOf[K]
var v1, v2 = null.asInstanceOf[V]
var n = 0
if (pred((key1, value1)) != isFlipped) { { k1 = key1; v1 = value1 }; n += 1}
if (pred((key2, value2)) != isFlipped) { if (n == 0) { k1 = key2; v1 = value2 } else { k2 = key2; v2 = value2 }; n += 1}
if (pred((key3, value3)) != isFlipped) { if (n == 0) { k1 = key3; v1 = value3 } else if (n == 1) { k2 = key3; v2 = value3 }; n += 1}
n match {
case 0 => Map.empty
case 1 => new Map1(k1, v1)
case 2 => new Map2(k1, v1, k2, v2)
case 3 => this
}
}
override def transform[W](f: (K, V) => W): Map[K, W] = {
val walue1 = f(key1, value1)
val walue2 = f(key2, value2)
val walue3 = f(key3, value3)
if ((walue1.asInstanceOf[AnyRef] eq value1.asInstanceOf[AnyRef]) &&
(walue2.asInstanceOf[AnyRef] eq value2.asInstanceOf[AnyRef]) &&
(walue3.asInstanceOf[AnyRef] eq value3.asInstanceOf[AnyRef])) this.asInstanceOf[Map[K, W]]
else new Map3(key1, walue1, key2, walue2, key3, walue3)
}
override def hashCode(): Int = {
import scala.util.hashing.MurmurHash3
var a, b = 0
val N = 3
var c = 1
var h = MurmurHash3.tuple2Hash(key1, value1)
a += h
b ^= h
c *= h | 1
h = MurmurHash3.tuple2Hash(key2, value2)
a += h
b ^= h
c *= h | 1
h = MurmurHash3.tuple2Hash(key3, value3)
a += h
b ^= h
c *= h | 1
h = MurmurHash3.mapSeed
h = MurmurHash3.mix(h, a)
h = MurmurHash3.mix(h, b)
h = MurmurHash3.mixLast(h, c)
MurmurHash3.finalizeHash(h, N)
}
}
@SerialVersionUID(3L)
final class Map4[K, +V](key1: K, value1: V, key2: K, value2: V, key3: K, value3: V, key4: K, value4: V)
extends AbstractMap[K, V] with StrictOptimizedIterableOps[(K, V), Iterable, Map[K, V]] with Serializable {
override def size: Int = 4
override def knownSize: Int = 4
override def isEmpty: Boolean = false
override def apply(key: K): V =
if (key == key1) value1
else if (key == key2) value2
else if (key == key3) value3
else if (key == key4) value4
else throw new NoSuchElementException("key not found: " + key)
override def contains(key: K): Boolean = (key == key1) || (key == key2) || (key == key3) || (key == key4)
def get(key: K): Option[V] =
if (key == key1) Some(value1)
else if (key == key2) Some(value2)
else if (key == key3) Some(value3)
else if (key == key4) Some(value4)
else None
override def getOrElse [V1 >: V](key: K, default: => V1): V1 =
if (key == key1) value1
else if (key == key2) value2
else if (key == key3) value3
else if (key == key4) value4
else default
def iterator: Iterator[(K, V)] = new Map4Iterator[(K, V)] {
override protected def nextResult(k: K, v: V): (K, V) = (k, v)
}
override def keysIterator: Iterator[K] = new Map4Iterator[K] {
override protected def nextResult(k: K, v: V): K = k
}
override def valuesIterator: Iterator[V] = new Map4Iterator[V] {
override protected def nextResult(k: K, v: V): V = v
}
private abstract class Map4Iterator[A] extends AbstractIterator[A] {
private[this] var i = 0
override def hasNext: Boolean = i < 4
override def next(): A = {
val result = i match {
case 0 => nextResult(key1, value1)
case 1 => nextResult(key2, value2)
case 2 => nextResult(key3, value3)
case 3 => nextResult(key4, value4)
case _ => Iterator.empty.next()
}
i += 1
result
}
override def drop(n: Int): Iterator[A] = { i += n; this }
protected def nextResult(k: K, v: V @uncheckedVariance): A
}
def updated[V1 >: V](key: K, value: V1): Map[K, V1] =
if (key == key1) new Map4(key1, value, key2, value2, key3, value3, key4, value4)
else if (key == key2) new Map4(key1, value1, key2, value, key3, value3, key4, value4)
else if (key == key3) new Map4(key1, value1, key2, value2, key3, value, key4, value4)
else if (key == key4) new Map4(key1, value1, key2, value2, key3, value3, key4, value)
else HashMap.empty[K, V1].updated(key1,value1).updated(key2, value2).updated(key3, value3).updated(key4, value4).updated(key, value)
def removed(key: K): Map[K, V] =
if (key == key1) new Map3(key2, value2, key3, value3, key4, value4)
else if (key == key2) new Map3(key1, value1, key3, value3, key4, value4)
else if (key == key3) new Map3(key1, value1, key2, value2, key4, value4)
else if (key == key4) new Map3(key1, value1, key2, value2, key3, value3)
else this
override def foreach[U](f: ((K, V)) => U): Unit = {
f((key1, value1)); f((key2, value2)); f((key3, value3)); f((key4, value4))
}
override def exists(p: ((K, V)) => Boolean): Boolean = p((key1, value1)) || p((key2, value2)) || p((key3, value3)) || p((key4, value4))
override def forall(p: ((K, V)) => Boolean): Boolean = p((key1, value1)) && p((key2, value2)) && p((key3, value3)) && p((key4, value4))
override protected[collection] def filterImpl(pred: ((K, V)) => Boolean, isFlipped: Boolean): Map[K, V] = {
var k1, k2, k3 = null.asInstanceOf[K]
var v1, v2, v3 = null.asInstanceOf[V]
var n = 0
if (pred((key1, value1)) != isFlipped) { { k1 = key1; v1 = value1 }; n += 1}
if (pred((key2, value2)) != isFlipped) { if (n == 0) { k1 = key2; v1 = value2 } else { k2 = key2; v2 = value2 }; n += 1}
if (pred((key3, value3)) != isFlipped) { if (n == 0) { k1 = key3; v1 = value3 } else if (n == 1) { k2 = key3; v2 = value3 } else { k3 = key3; v3 = value3}; n += 1}
if (pred((key4, value4)) != isFlipped) { if (n == 0) { k1 = key4; v1 = value4 } else if (n == 1) { k2 = key4; v2 = value4 } else if (n == 2) { k3 = key4; v3 = value4 }; n += 1}
n match {
case 0 => Map.empty
case 1 => new Map1(k1, v1)
case 2 => new Map2(k1, v1, k2, v2)
case 3 => new Map3(k1, v1, k2, v2, k3, v3)
case 4 => this
}
}
override def transform[W](f: (K, V) => W): Map[K, W] = {
val walue1 = f(key1, value1)
val walue2 = f(key2, value2)
val walue3 = f(key3, value3)
val walue4 = f(key4, value4)
if ((walue1.asInstanceOf[AnyRef] eq value1.asInstanceOf[AnyRef]) &&
(walue2.asInstanceOf[AnyRef] eq value2.asInstanceOf[AnyRef]) &&
(walue3.asInstanceOf[AnyRef] eq value3.asInstanceOf[AnyRef]) &&
(walue4.asInstanceOf[AnyRef] eq value4.asInstanceOf[AnyRef])) this.asInstanceOf[Map[K, W]]
else new Map4(key1, walue1, key2, walue2, key3, walue3, key4, walue4)
}
private[immutable] def buildTo[V1 >: V](builder: HashMapBuilder[K, V1]): builder.type =
builder.addOne(key1, value1).addOne(key2, value2).addOne(key3, value3).addOne(key4, value4)
override def hashCode(): Int = {
import scala.util.hashing.MurmurHash3
var a, b = 0
val N = 4
var c = 1
var h = MurmurHash3.tuple2Hash(key1, value1)
a += h
b ^= h
c *= h | 1
h = MurmurHash3.tuple2Hash(key2, value2)
a += h
b ^= h
c *= h | 1
h = MurmurHash3.tuple2Hash(key3, value3)
a += h
b ^= h
c *= h | 1
h = MurmurHash3.tuple2Hash(key4, value4)
a += h
b ^= h
c *= h | 1
h = MurmurHash3.mapSeed
h = MurmurHash3.mix(h, a)
h = MurmurHash3.mix(h, b)
h = MurmurHash3.mixLast(h, c)
MurmurHash3.finalizeHash(h, N)
}
}
}
/** Explicit instantiation of the `Map` trait to reduce class file size in subclasses. */
abstract class AbstractMap[K, +V] extends scala.collection.AbstractMap[K, V] with Map[K, V]
private[immutable] final class MapBuilderImpl[K, V] extends ReusableBuilder[(K, V), Map[K, V]] {
private[this] var elems: Map[K, V] = Map.empty
private[this] var switchedToHashMapBuilder: Boolean = false
private[this] var hashMapBuilder: HashMapBuilder[K, V] = _
private[immutable] def getOrElse[V0 >: V](key: K, value: V0): V0 =
if (hashMapBuilder ne null) hashMapBuilder.getOrElse(key, value)
else elems.getOrElse(key, value)
override def clear(): Unit = {
elems = Map.empty
if (hashMapBuilder != null) {
hashMapBuilder.clear()
}
switchedToHashMapBuilder = false
}
override def result(): Map[K, V] =
if (switchedToHashMapBuilder) hashMapBuilder.result() else elems
def addOne(key: K, value: V): this.type = {
if (switchedToHashMapBuilder) {
hashMapBuilder.addOne(key, value)
} else if (elems.size < 4) {
elems = elems.updated(key, value)
} else {
// assert(elems.size == 4)
if (elems.contains(key)) {
elems = elems.updated(key, value)
} else {
switchedToHashMapBuilder = true
if (hashMapBuilder == null) {
hashMapBuilder = new HashMapBuilder
}
elems.asInstanceOf[Map4[K, V]].buildTo(hashMapBuilder)
hashMapBuilder.addOne(key, value)
}
}
this
}
def addOne(elem: (K, V)) = addOne(elem._1, elem._2)
override def addAll(xs: IterableOnce[(K, V)]): this.type =
if (switchedToHashMapBuilder) {
hashMapBuilder.addAll(xs)
this
} else {
super.addAll(xs)
}
}
