Add Extractor and apply Method for SoftReference

scala.ref.WeakReference has two features which are lacking in
scala.ref.SoftReference, an extractor and
a .apply method that greatly enhance the usability of
that class.  This commit simply replicates that functionality for
SoftReference.

1 files changed, 13 insertions, 0 deletions

diff --git a/src/library/scala/ref/SoftReference.scala b/src/library/scala/ref/SoftReference.scala
index e4ce667981..5e60f00788 100644
--- a/src/library/scala/ref/SoftReference.scala
+++ b/src/library/scala/ref/SoftReference.scala
@@ -20,6 +20,19 @@ class SoftReference[+T <: AnyRef](value : T, queue : ReferenceQueue[T]) extends
 }
 
 /**
+ *  A companion object that implements an extractor for `SoftReference` values
+ *  @author Rebecca Claire Murphy
+ */
+object SoftReference {
+
+  /** Creates a `SoftReference` pointing to `value` */
+  def apply[T <: AnyRef](value: T) = new SoftReference(value)
+
+  /** Optionally returns the referenced value, or `None` if that value no longer exists */
+  def unapply[T <: AnyRef](sr: SoftReference[T]): Option[T] = Option(sr.underlying.get)
+}
+
+/**
  *  @author Philipp Haller
  */
 private class SoftReferenceWithWrapper[T <: AnyRef](value: T, queue: ReferenceQueue[T], val wrapper: SoftReference[T])