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/* __ *\
** ________ ___ / / ___ Scala API **
** / __/ __// _ | / / / _ | (c) 2003, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ | **
** /____/\___/_/ |_/____/_/ | | **
** |/ **
** $Id$
\* */
package scala.collection.mutable;
/** This extensible class may be used as a basis for implementing double
* linked lists. Type variable <code>A</code> refers to the element type
* of the list, type variable <code>This</code> is used to model self
* types of linked lists.
*
* @author Matthias Zenger
* @version 1.0, 08/07/2003
*/
[serializable]
abstract class DoubleLinkedList[A, This <: DoubleLinkedList[A, This]]: This
extends SingleLinkedList[A, This] {
var prev: This = _;
override def append(that: This): Unit =
if (that == null)
()
else if (next == null) {
next = that;
that.prev = this;
} else
next.append(that);
override def insert(that: This): Unit = if (that != null) {
that.append(next);
next = that;
that.prev = this;
}
def remove: Unit = {
if (next != null)
next.prev = prev;
if (prev != null)
prev.next = next;
prev = null;
next = null;
}
}
|
