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diff --git a/src/library/scalax/collection/immutable/Map1.scala b/src/library/scalax/collection/immutable/Map1.scala
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+/*                     __                                               *\
+**     ________ ___   / /  ___     Scala API                            **
+**    / __/ __// _ | / /  / _ |    (c) 2003-2009, LAMP/EPFL             **
+**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
+** /____/\___/_/ |_/____/_/ | |                                         **
+**                          |/                                          **
+\*                                                                      */
+
+// $Id: Map1.scala 16893 2009-01-13 13:09:22Z cunei $
+
+
+
+package scalax.collection.immutable
+
+/** This class implements immutable maps with exactly one entry
+ *
+ *  @author  Martin Oderskty
+ *  @version 1.0, 019/01/2007
+ */
+@serializable
+class Map1[A, B](key1: A, value1: B) extends Map[A, B] {
+
+  def size = 1
+
+  def get(key: A): Option[B] =
+    if (key == key1) Some(value1) else None
+
+  def elements = Iterator((key1, value1))
+
+  def update (key: A, value: B): Map[A, B] =
+    if (key == key1) new Map1(key1, value)
+    else null // new Map2(key1, value1, key, value)
+
+  def - (key: A): Map[A, B] =
+    if (key == key1) empty else this
+}
+
+
+