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/* __ *\
** ________ ___ / / ___ Scala API **
** / __/ __// _ | / / / _ | (c) 2003-2007, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ | http://scala-lang.org/ **
** /____/\___/_/ |_/____/_/ | | **
** |/ **
\* */
// $Id: ResizableArray.scala 15407 2008-06-20 09:26:36Z stepancheg $
package scalax.collection.mutable
/** This class is used internally to implement data structures that
* are based on resizable arrays.
*
* @author Matthias Zenger, Burak Emir
* @version 1.0, 03/05/2004
*/
trait ResizableArray[A] extends Vector[A] {
protected def initialSize: Int = 16
protected var array: Array[AnyRef] = new Array[AnyRef](initialSize min 1)
protected var size0: Int = 0
//##########################################################################
// implement/override methods of Vector[A]
/** Returns the length of this resizable array.
*/
def length: Int = size0
def apply(idx: Int) = {
if (idx >= size0) throw new IndexOutOfBoundsException(idx.toString)
array(idx).asInstanceOf[A]
}
def update(idx: Int, elem: A) {
if (idx >= size0) throw new IndexOutOfBoundsException(idx.toString)
array(idx) = elem.asInstanceOf[AnyRef]
}
/** 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.
*/
override def copyToArray[B >: A](xs: Array[B], start: Int) {
Array.copy(array, 0, xs, start, size0)
}
/** Copy all elements to a buffer
* @param The buffer to which elements are copied
*/
override def copyToBuffer[B >: A](dest: Buffer[B]) {
dest ++= array.asInstanceOf[Iterable[A]] // !@!
}
override def foreach(f: A => Unit) {
var i = 0
while (i < size) {
f(array(i).asInstanceOf[A])
i += 1
}
}
//##########################################################################
/** remove elements of this array at indices after <code>sz</code>
*/
def reduceToSize(sz: Int) {
require(sz <= size0)
size0 = sz
}
/** ensure that the internal array has at n cells */
protected def ensureSize(n: Int) {
if (n > array.length) {
var newsize = array.length * 2
while (n > newsize)
newsize = newsize * 2
val newar: Array[AnyRef] = new Array(newsize)
Array.copy(array, 0, newar, 0, size0)
array = newar
}
}
/** Swap two elements of this array.
*/
protected def swap(a: Int, b: Int) {
val h = array(a)
array(a) = array(b)
array(b) = h
}
/** Move parts of the array.
*/
protected def copy(m: Int, n: Int, len: Int) {
Array.copy(array, m, array, n, len)
}
}
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