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Diffstat (limited to 'src/library/scalax/collection/immutable/Map1.scala')
-rwxr-xr-x | src/library/scalax/collection/immutable/Map1.scala | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/src/library/scalax/collection/immutable/Map1.scala b/src/library/scalax/collection/immutable/Map1.scala new file mode 100755 index 0000000000..f518c7cf17 --- /dev/null +++ b/src/library/scalax/collection/immutable/Map1.scala @@ -0,0 +1,39 @@ +/* __ *\ +** ________ ___ / / ___ 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 +} + + + |