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ChunkPlatform.scala
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ChunkPlatform.scala
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/*
* Copyright (c) 2013 Functional Streams for Scala
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
* the Software, and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
package fs2
import scodec.bits.ByteVector
import scala.collection.immutable.ArraySeq
import scala.collection.immutable
import scala.reflect.ClassTag
private[fs2] trait ChunkPlatform[+O] { self: Chunk[O] =>
def toArraySeq[O2 >: O: ClassTag]: ArraySeq[O2] = {
val array: Array[O2] = new Array[O2](size)
copyToArray(array)
ArraySeq.unsafeWrapArray[O2](array)
}
def toArraySeqUntagged: ArraySeq[O] = {
val buf = ArraySeq.untagged.newBuilder[O]
buf.sizeHint(size)
var i = 0
while (i < size) {
buf += apply(i)
i += 1
}
buf.result()
}
def toIArray[O2 >: O: ClassTag]: IArray[O2] = IArray.unsafeFromArray(toArray)
def toIArraySlice[O2 >: O](implicit ct: ClassTag[O2]): Chunk.IArraySlice[O2] =
this match {
case as: Chunk.IArraySlice[_] if ct.wrap.runtimeClass eq as.getClass =>
as.asInstanceOf[Chunk.IArraySlice[O2]]
case _ => new Chunk.IArraySlice(IArray.unsafeFromArray(toArray(ct)), 0, size)
}
}
private[fs2] trait ChunkCompanionPlatform { self: Chunk.type =>
protected def platformIterable[O](i: Iterable[O]): Option[Chunk[O]] =
i match {
case a: immutable.ArraySeq[O] => Some(arraySeq(a))
case _ => None
}
/** Creates a chunk backed by an immutable `ArraySeq`.
*/
def arraySeq[O](arraySeq: immutable.ArraySeq[O]): Chunk[O] = {
val arr = arraySeq.unsafeArray.asInstanceOf[Array[O]]
array(arr)(ClassTag[O](arr.getClass.getComponentType))
}
/** Creates a chunk backed by an immutable array.
*/
def iarray[O: ClassTag](arr: IArray[O]): Chunk[O] = new IArraySlice(arr, 0, arr.length)
/** Creates a chunk backed by a slice of an immutable array.
*/
def iarray[O: ClassTag](arr: IArray[O], offset: Int, length: Int): Chunk[O] =
new IArraySlice(arr, offset, length)
case class IArraySlice[O](values: IArray[O], offset: Int, length: Int)(implicit ct: ClassTag[O])
extends Chunk[O] {
require(
offset >= 0 && offset <= values.size && length >= 0 && length <= values.size && offset + length <= values.size
)
def size = length
def apply(i: Int) = values(offset + i)
def copyToArray[O2 >: O](xs: Array[O2], start: Int): Unit =
if (xs.getClass eq ct.wrap.runtimeClass) System.arraycopy(values, offset, xs, start, length)
else {
values.iterator.slice(offset, offset + length).copyToArray(xs, start)
()
}
override def drop(n: Int): Chunk[O] =
if (n <= 0) this
else if (n >= size) Chunk.empty
else IArraySlice(values, offset + n, length - n)
override def take(n: Int): Chunk[O] =
if (n <= 0) Chunk.empty
else if (n >= size) this
else IArraySlice(values, offset, n)
protected def splitAtChunk_(n: Int): (Chunk[O], Chunk[O]) =
IArraySlice(values, offset, n) -> IArraySlice(values, offset + n, length - n)
override def toArray[O2 >: O: ClassTag]: Array[O2] =
values.slice(offset, offset + length).asInstanceOf[Array[O2]]
override def toIArray[O2 >: O: ClassTag]: IArray[O2] =
if (offset == 0 && length == values.length) values
else super.toIArray[O2]
override def toByteVector[B >: O](implicit ev: B =:= Byte): ByteVector =
if (values.isInstanceOf[Array[Byte]])
ByteVector.view(values.asInstanceOf[Array[Byte]], offset, length)
else ByteVector.viewAt(i => apply(i.toInt), size.toLong)
}
/** Creates a chunk from a `scala.collection.IterableOnce`. */
def iterableOnce[O](i: collection.IterableOnce[O]): Chunk[O] =
iterator(i.iterator)
}