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Diffstat (limited to 'src/library/scalax/collection/immutable/Map4.scala')
-rw-r--r-- | src/library/scalax/collection/immutable/Map4.scala | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/src/library/scalax/collection/immutable/Map4.scala b/src/library/scalax/collection/immutable/Map4.scala new file mode 100644 index 0000000000..ad2dcd513b --- /dev/null +++ b/src/library/scalax/collection/immutable/Map4.scala @@ -0,0 +1,50 @@ +/* __ *\ +** ________ ___ / / ___ 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 Map4[A, B](key1: A, value1: B, key2: A, value2: B, key3: A, value3: B, key4: A, value4: B) extends Map[A, B] { + + def size = 4 + + def get(key: A): Option[B] = + if (key == key1) Some(value1) + else if (key == key2) Some(value2) + else if (key == key3) Some(value3) + else if (key == key4) Some(value4) + else None + + def elements = Iterator((key1, value1), (key2, value2), (key3, value3), (key4, value4)) + + def update (key: A, value: B): Map[A, B] = + if (key == key1) new Map4(key1, value, key2, value2, key3, value3, key4, value4) + else if (key == key2) new Map4(key1, value1, key2, value, key3, value3, key4, value4) + else if (key == key3) new Map4(key1, value1, key2, value2, key3, value, key4, value4) + else if (key == key4) new Map4(key1, value1, key2, value2, key3, value3, key4, value) + else HashMap((key1, value1), (key2, value2), (key3, value3), (key4, value4), (key, value)) + + def - (key: A): Map[A, B] = + if (key == key1) new Map3(key2, value2, key3, value3, key4, value4) + else if (key == key2) new Map3(key1, value1, key3, value3, key4, value4) + else if (key == key3) new Map3(key1, value1, key2, value2, key4, value4) + else if (key == key4) new Map3(key1, value1, key2, value2, key3, value3) + else this +} + + + |