From 73006bc163947638aecd20d1b0be31467625751f Mon Sep 17 00:00:00 2001
From: stepancheg <stepancheg@epfl.ch>
Date: Fri, 27 Jun 2008 09:22:09 +0000
Subject: Add RandomAccessSeqProxy

---
 src/library/scala/IterableProxy.scala              |  2 +-
 src/library/scala/RandomAccessSeqProxy.scala       | 33 ++++++++++++++++++++++
 src/library/scala/SeqProxy.scala                   |  2 +-
 .../collection/mutable/PriorityQueueProxy.scala    |  6 +---
 4 files changed, 36 insertions(+), 7 deletions(-)
 create mode 100644 src/library/scala/RandomAccessSeqProxy.scala

(limited to 'src')

diff --git a/src/library/scala/IterableProxy.scala b/src/library/scala/IterableProxy.scala
index 1c51ca627a..361113a7a4 100644
--- a/src/library/scala/IterableProxy.scala
+++ b/src/library/scala/IterableProxy.scala
@@ -23,7 +23,7 @@ import scala.collection.mutable.Buffer
  */
 trait IterableProxy[+A] extends Iterable[A] with Proxy {
 
-  def self: Iterable[A]
+  override def self: Iterable[A]
   override def elements: Iterator[A] = self.elements
   @deprecated
   override def concat [B >: A](that: Iterable[B]): Collection[B] = self concat that
diff --git a/src/library/scala/RandomAccessSeqProxy.scala b/src/library/scala/RandomAccessSeqProxy.scala
new file mode 100644
index 0000000000..a5fb245f97
--- /dev/null
+++ b/src/library/scala/RandomAccessSeqProxy.scala
@@ -0,0 +1,33 @@
+/*                     __                                               *\
+**     ________ ___   / /  ___     Scala API                            **
+**    / __/ __// _ | / /  / _ |    (c) 2003-2008, LAMP/EPFL             **
+**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
+** /____/\___/_/ |_/____/_/ | |                                         **
+**                          |/                                          **
+\*                                                                      */
+
+// $Id$
+
+
+package scala
+
+/** This class implements a proxy for random access sequences. It forwards
+ *  all calls to a different sequence object.
+ *
+ *  @author  Stepan Koltsov
+ *  @version 1.0, 27/06/2008
+ */
+trait RandomAccessSeqProxy[+A] extends RandomAccessSeq[A] with SeqProxy[A] {
+  override def self: RandomAccessSeq[A]
+
+  override def drop(from: Int): RandomAccessSeq[A] = self.drop(from)
+  override def take(until: Int): RandomAccessSeq[A] = self.take(until)
+  override def slice(from: Int, until: Int) : RandomAccessSeq[A] = self.slice(from, until)
+  override def partition(p: A => Boolean): (RandomAccessSeq[A], RandomAccessSeq[A]) =
+    self.partition(p)
+  // XXX: def patch, reverse, should not return projection
+  override def ++[B >: A](that: Iterable[B]): RandomAccessSeq[B] = self ++ that
+  override def toStream: Stream[A] = self.toStream
+}
+
+// vim: set ts=2 sw=2 et:
diff --git a/src/library/scala/SeqProxy.scala b/src/library/scala/SeqProxy.scala
index 28878f7d18..b9385139fa 100644
--- a/src/library/scala/SeqProxy.scala
+++ b/src/library/scala/SeqProxy.scala
@@ -21,7 +21,7 @@ package scala
  */
 trait SeqProxy[+A] extends Seq[A] with IterableProxy[A] {
 
-  def self: Seq[A]
+  override def self: Seq[A]
 
   override def apply(i: Int): A = self(i)
   override def length: Int = self.length
diff --git a/src/library/scala/collection/mutable/PriorityQueueProxy.scala b/src/library/scala/collection/mutable/PriorityQueueProxy.scala
index 83b84cef07..ac0742cfc0 100644
--- a/src/library/scala/collection/mutable/PriorityQueueProxy.scala
+++ b/src/library/scala/collection/mutable/PriorityQueueProxy.scala
@@ -20,7 +20,7 @@ package scala.collection.mutable
  *  @version 1.0, 03/05/2004
  */
 abstract class PriorityQueueProxy[A <% Ordered[A]] extends PriorityQueue[A]
-         with SeqProxy[A]
+         with RandomAccessSeqProxy[A]
 {
 
   def self: PriorityQueue[A]
@@ -90,10 +90,6 @@ abstract class PriorityQueueProxy[A <% Ordered[A]] extends PriorityQueue[A]
    */
   override def toQueue: Queue[A] = self.toQueue
 
-  override def take(until : Int) = self take until
-  override def drop(from : Int) = self drop from
-  override def slice(from : Int, until : Int) = self.slice(from, until)
-
   /** This method clones the priority queue.
    *
    *  @return  a priority queue with the same elements.
-- 
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