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Diffstat (limited to 'src/library/scalax/collection/mutable/DefaultMapModel.scala')
| -rw-r--r-- | src/library/scalax/collection/mutable/DefaultMapModel.scala | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/src/library/scalax/collection/mutable/DefaultMapModel.scala b/src/library/scalax/collection/mutable/DefaultMapModel.scala new file mode 100644 index 0000000000..fda7798e26 --- /dev/null +++ b/src/library/scalax/collection/mutable/DefaultMapModel.scala @@ -0,0 +1,44 @@ +/* __ *\ +** ________ ___ / / ___ Scala API ** +** / __/ __// _ | / / / _ | (c) 2003-2009, LAMP/EPFL ** +** __\ \/ /__/ __ |/ /__/ __ | ** +** /____/\___/_/ |_/____/_/ | | ** +** |/ ** +\* */ + +// $Id: DefaultMapModel.scala 16893 2009-01-13 13:09:22Z cunei $ + + +package scalax.collection.mutable + +/** This class is used internally. It implements the mutable <code>Map</code> + * class in terms of three functions: <code>findEntry</code>, + * <code>addEntry</code>, and <code>entries</code>. + * + * @author Matthias Zenger + * @version 1.0, 08/07/2003 + */ +trait DefaultMapModel[A, B] extends Map[A, B] { + + type Entry = DefaultEntry[A, B] + + protected def findEntry(key: A): Entry + protected def addEntry(e: Entry) + protected def entries: Iterator[Entry] + + def get(key: A): Option[B] = { + val e = findEntry(key) + if (e == null) None + else Some(e.value); + } + + def update(key: A, value: B): this.type = { + val e = findEntry(key) + if (e == null) addEntry(new Entry(key, value)) + else e.value = value + this + } + + def elements = entries map {e => (e.key, e.value)} +} + |