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/* __ *\
** ________ ___ / / ___ Scala API **
** / __/ __// _ | / / / _ | (c) 2002-2009, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ | http://scala-lang.org/ **
** /____/\___/_/ |_/____/_/ | | **
** |/ **
\* */
// $Id: BoxedArray.scala 17000 2009-01-29 13:05:53Z odersky $
package scalax.runtime
import Predef._
import collection.mutable.{Vector, ArrayBuffer}
import collection.generic._
/**
* <p>A class representing <code>Array[T]</code></p>
*
* @author Martin Odersky, Stephane Micheloud
* @version 1.0
*/
abstract class BoxedArray[A] extends Vector[A] with MutableVectorTemplate[BoxedArray, A] with Boxed {
/** The length of the array */
def length: Int
/** The element at given index */
def apply(index: Int): A
/** Update element at given index */
def update(index: Int, elem: A): Unit
/** Creates new builder for this collection ==> move to subclasses
*
* */
def newBuilder[B] = new ArrayBuffer[B].mapResult[BoxedArray] { // !!! Adriaan: can't drop [BoxedArray] here
_.toArray.asInstanceOf[BoxedArray[B]]
}
/** Convert to Java array.
* @param elemTag Either one of the tags ".N" where N is the name of a primitive type
* (@see ScalaRunTime), or a full class name.
*/
def unbox(elemClass: Class[_]): AnyRef
/** The underlying array value
*/
def value: AnyRef
def copyFrom(src: AnyRef, from: Int, to: Int, len: Int): Unit =
Array.copy(src, from, value, to, len)
def copyTo(from: Int, dest: AnyRef, to: Int, len: Int): Unit = {
Array.copy(value, from, dest, to, len)
}
override def equals(other: Any) =
(value == other) ||
other.isInstanceOf[BoxedArray[_]] && (value == other.asInstanceOf[BoxedArray[_]].value)
override def hashCode(): Int = value.hashCode()
/** Fills the given array <code>xs</code> with the elements of
* this sequence starting at position <code>start</code>.
*
* @param xs the array to fill.
* @param start starting index.
* @pre the array must be large enough to hold all elements.
*/
override def copyToArray[B](xs: Array[B], start: Int, len: Int): Unit =
copyTo(0, xs, start, len)
final def deepToString() = deepMkString(stringPrefix + "(", ", ", ")")
final def deepMkString(start: String, sep: String, end: String): String = {
def _deepToString(x: Any) = x match {
case a: AnyRef if ScalaRunTime.isArray(a) =>
ScalaRunTime.boxArray(a).deepMkString(start, sep, end)
case _ =>
ScalaRunTime.stringOf(x)
}
val buf = new StringBuilder()
buf.append(start)
val elems = elements
if (elems.hasNext) buf.append(_deepToString(elems.next))
while (elems.hasNext) {
buf.append(sep); buf.append(_deepToString(elems.next))
}
buf.append(end)
buf.toString
}
final def deepMkString(sep: String): String = this.deepMkString("", sep, "")
final def deepEquals(that: Any): Boolean = {
def _deepEquals(x1: Any, x2: Any) = (x1, x2) match {
case (a1: BoxedArray[_], a2: BoxedArray[_]) =>
_sameElements(a1, a2)
case (a1: AnyRef, a2: AnyRef)
if ScalaRunTime.isArray(a1) && ScalaRunTime.isArray(a2) =>
_sameElements(ScalaRunTime.boxArray(a1), ScalaRunTime.boxArray(a2))
case _ =>
x1.equals(x2)
}
def _sameElements(a1: BoxedArray[_], a2: BoxedArray[_]): Boolean = {
val it1 = a1.elements
val it2 = a2.elements
var res = true
while (res && it1.hasNext && it2.hasNext)
res = _deepEquals(it1.next, it2.next)
!it1.hasNext && !it2.hasNext && res
}
that match {
case a: BoxedArray[_] =>
_sameElements(this, a)
case a: AnyRef if ScalaRunTime.isArray(a) =>
_sameElements(this, ScalaRunTime.boxArray(a))
case _ =>
false
}
}
override final def stringPrefix: String = "Array"
protected def countAndMemo(p: A => Boolean): (Int, Array[Boolean]) = {
val len = length
val memo = new Array[Boolean](len)
var count = 0
var i = 0
while (i < len) {
if (p(this(i))) { memo(i) = true; count += 1 }
i += 1
}
(count, memo)
}
}
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