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Diffstat (limited to 'src/library/scala/collection/mutable/ImmutableMapAdaptor.scala')
-rw-r--r-- | src/library/scala/collection/mutable/ImmutableMapAdaptor.scala | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/src/library/scala/collection/mutable/ImmutableMapAdaptor.scala b/src/library/scala/collection/mutable/ImmutableMapAdaptor.scala new file mode 100644 index 0000000000..5167636b40 --- /dev/null +++ b/src/library/scala/collection/mutable/ImmutableMapAdaptor.scala @@ -0,0 +1,64 @@ +/* __ *\ +** ________ ___ / / ___ Scala API ** +** / __/ __// _ | / / / _ | (c) 2003, LAMP/EPFL ** +** __\ \/ /__/ __ |/ /__/ __ | ** +** /____/\___/_/ |_/____/_/ | | ** +** |/ ** +** $Id$ +\* */ + +package scala.collection.mutable; + + +/** This class can be used as an adaptor to create mutable maps from + * immutable map implementations. Only method <code>empty</code> has + * to be redefined if the immutable map on which this mutable map is + * originally based is not empty. <code>empty</code> is supposed to + * return the representation of an empty map. + * + * @author Matthias Zenger + * @version 1.0, 21/07/2003 + */ +[serializable] +class ImmutableMapAdaptor[A, B](m: scala.collection.immutable.Map[A, B]) extends Map[A, B] { + + protected var imap = m; + + def size: Int = imap.size; + + def get(key: A): Option[B] = imap.get(key); + + override def isEmpty: Boolean = imap.isEmpty; + + override def apply(key: A): B = imap.apply(key); + + override def contains(key: A): Boolean = imap.contains(key); + + override def isDefinedAt(key: A) = imap.isDefinedAt(key); + + override def keys: Iterator[A] = imap.keys; + + override def values: Iterator[B] = imap.values; + + def elements: Iterator[Pair[A, B]] = imap.elements; + + override def foreach(f: (A, B) => Unit) = imap.foreach(f); + + override def toList: List[Pair[A, B]] = imap.toList; + + override def toString() = imap.toString(); + + def update(key: A, value: B): Unit = { imap = imap.update(key, value); } + + def -=(key: A): Unit = { imap = imap - key; } + + override def clear: Unit = { imap = empty; } + + override def map(f: (A, B) => B): Unit = { imap = imap.map(f); } + + override def filter(p: (A, B) => Boolean): Unit = { imap = imap.filter(p); } + + override def mappingToString(p: Pair[A, B]) = imap.mappingToString(p); + + protected def empty: scala.collection.immutable.Map[A, B] = m; +} |