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/* __ *\
** ________ ___ / / ___ Scala API **
** / __/ __// _ | / / / _ | (c) 2002-2013, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ | http://scala-lang.org/ **
** /____/\___/_/ |_/____/_/ | | **
** |/ **
\* */
package scala
package collection
package mutable
import scala.reflect.ClassTag
import scala.runtime.ScalaRunTime._
import scala.collection.generic._
import scala.collection.parallel.mutable.ParArray
/**
* A class representing `Array[T]`.
*
* @tparam T type of the elements in this wrapped array.
*
* @author Martin Odersky, Stephane Micheloud
* @version 1.0
* @since 2.8
* @define Coll `WrappedArray`
* @define coll wrapped array
* @define orderDependent
* @define orderDependentFold
* @define mayNotTerminateInf
* @define willNotTerminateInf
*/
abstract class WrappedArray[T]
extends AbstractSeq[T]
with IndexedSeq[T]
with ArrayLike[T, WrappedArray[T]]
with CustomParallelizable[T, ParArray[T]]
{
override protected[this] def thisCollection: WrappedArray[T] = this
override protected[this] def toCollection(repr: WrappedArray[T]): WrappedArray[T] = repr
/** The tag of the element type */
def elemTag: ClassTag[T]
@deprecated("use elemTag instead", "2.10.0")
def elemManifest: ClassManifest[T] = ClassManifest.fromClass[T](arrayElementClass(elemTag).asInstanceOf[Class[T]])
/** The length of the array */
def length: Int
/** The element at given index */
def apply(index: Int): T
/** Update element at given index */
def update(index: Int, elem: T): Unit
/** The underlying array */
def array: Array[T]
override def par = ParArray.handoff(array)
private def elementClass: Class[_] =
arrayElementClass(array.getClass)
override def toArray[U >: T : ClassTag]: Array[U] = {
val thatElementClass = arrayElementClass(implicitly[ClassTag[U]])
if (elementClass eq thatElementClass)
array.asInstanceOf[Array[U]]
else
super.toArray[U]
}
override def stringPrefix = "WrappedArray"
/** Clones this object, including the underlying Array. */
override def clone(): WrappedArray[T] = WrappedArray make array.clone()
/** Creates new builder for this collection ==> move to subclasses
*/
override protected[this] def newBuilder: Builder[T, WrappedArray[T]] =
new WrappedArrayBuilder[T](elemTag)
}
/** A companion object used to create instances of `WrappedArray`.
*/
object WrappedArray {
// This is reused for all calls to empty.
private val EmptyWrappedArray = new ofRef[AnyRef](new Array[AnyRef](0))
def empty[T <: AnyRef]: WrappedArray[T] = EmptyWrappedArray.asInstanceOf[WrappedArray[T]]
// If make is called explicitly we use whatever we're given, even if it's
// empty. This may be unnecesssary (if WrappedArray is to honor the collections
// contract all empty ones must be equal, so discriminating based on the reference
// equality of an empty array should not come up) but we may as well be
// conservative since wrapRefArray contributes most of the unnecessary allocations.
def make[T](x: AnyRef): WrappedArray[T] = (x match {
case null => null
case x: Array[AnyRef] => new ofRef[AnyRef](x)
case x: Array[Int] => new ofInt(x)
case x: Array[Double] => new ofDouble(x)
case x: Array[Long] => new ofLong(x)
case x: Array[Float] => new ofFloat(x)
case x: Array[Char] => new ofChar(x)
case x: Array[Byte] => new ofByte(x)
case x: Array[Short] => new ofShort(x)
case x: Array[Boolean] => new ofBoolean(x)
case x: Array[Unit] => new ofUnit(x)
}).asInstanceOf[WrappedArray[T]]
implicit def canBuildFrom[T](implicit m: ClassTag[T]): CanBuildFrom[WrappedArray[_], T, WrappedArray[T]] =
new CanBuildFrom[WrappedArray[_], T, WrappedArray[T]] {
def apply(from: WrappedArray[_]): Builder[T, WrappedArray[T]] =
ArrayBuilder.make[T]()(m) mapResult WrappedArray.make[T]
def apply: Builder[T, WrappedArray[T]] =
ArrayBuilder.make[T]()(m) mapResult WrappedArray.make[T]
}
def newBuilder[A]: Builder[A, IndexedSeq[A]] = new ArrayBuffer
final class ofRef[T <: AnyRef](val array: Array[T]) extends WrappedArray[T] with Serializable {
lazy val elemTag = ClassTag[T](arrayElementClass(array.getClass))
def length: Int = array.length
def apply(index: Int): T = array(index).asInstanceOf[T]
def update(index: Int, elem: T) { array(index) = elem }
}
final class ofByte(val array: Array[Byte]) extends WrappedArray[Byte] with Serializable {
def elemTag = ClassTag.Byte
def length: Int = array.length
def apply(index: Int): Byte = array(index)
def update(index: Int, elem: Byte) { array(index) = elem }
}
final class ofShort(val array: Array[Short]) extends WrappedArray[Short] with Serializable {
def elemTag = ClassTag.Short
def length: Int = array.length
def apply(index: Int): Short = array(index)
def update(index: Int, elem: Short) { array(index) = elem }
}
final class ofChar(val array: Array[Char]) extends WrappedArray[Char] with Serializable {
def elemTag = ClassTag.Char
def length: Int = array.length
def apply(index: Int): Char = array(index)
def update(index: Int, elem: Char) { array(index) = elem }
}
final class ofInt(val array: Array[Int]) extends WrappedArray[Int] with Serializable {
def elemTag = ClassTag.Int
def length: Int = array.length
def apply(index: Int): Int = array(index)
def update(index: Int, elem: Int) { array(index) = elem }
}
final class ofLong(val array: Array[Long]) extends WrappedArray[Long] with Serializable {
def elemTag = ClassTag.Long
def length: Int = array.length
def apply(index: Int): Long = array(index)
def update(index: Int, elem: Long) { array(index) = elem }
}
final class ofFloat(val array: Array[Float]) extends WrappedArray[Float] with Serializable {
def elemTag = ClassTag.Float
def length: Int = array.length
def apply(index: Int): Float = array(index)
def update(index: Int, elem: Float) { array(index) = elem }
}
final class ofDouble(val array: Array[Double]) extends WrappedArray[Double] with Serializable {
def elemTag = ClassTag.Double
def length: Int = array.length
def apply(index: Int): Double = array(index)
def update(index: Int, elem: Double) { array(index) = elem }
}
final class ofBoolean(val array: Array[Boolean]) extends WrappedArray[Boolean] with Serializable {
def elemTag = ClassTag.Boolean
def length: Int = array.length
def apply(index: Int): Boolean = array(index)
def update(index: Int, elem: Boolean) { array(index) = elem }
}
final class ofUnit(val array: Array[Unit]) extends WrappedArray[Unit] with Serializable {
def elemTag = ClassTag.Unit
def length: Int = array.length
def apply(index: Int): Unit = array(index)
def update(index: Int, elem: Unit) { array(index) = elem }
}
}
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