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Diffstat (limited to 'src/library/scala/collection/jcl/WeakHashMap.scala')
| -rw-r--r-- | src/library/scala/collection/jcl/WeakHashMap.scala | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/src/library/scala/collection/jcl/WeakHashMap.scala b/src/library/scala/collection/jcl/WeakHashMap.scala new file mode 100644 index 0000000000..1d8ff4207e --- /dev/null +++ b/src/library/scala/collection/jcl/WeakHashMap.scala @@ -0,0 +1,31 @@ +/* __ *\ +** ________ ___ / / ___ Scala API ** +** / __/ __// _ | / / / _ | (c) 2006-2008, LAMP/EPFL ** +** __\ \/ /__/ __ |/ /__/ __ | http://www.scala-lang.org/ ** +** /____/\___/_/ |_/____/_/ | | ** +** |/ ** +\* */ + +// $Id$ + +package scala.collection.jcl + +/** <p> + * A map that is backed by a Java weak hash map, whose keys are maintained + * as weak references. + * </p> + * <p> + * Because keys are weak references, the garbage collector can collect + * them if they are not referred to elsewhere. + * </p> + * <p> + * Useful for implementing caches. + * </p> + * + * @author Sean McDirmid + */ +class WeakHashMap[K, E](override val underlying: java.util.WeakHashMap[K, E]) extends MapWrapper[K, E] { + def this() = this(new java.util.WeakHashMap[K, E]) + override def clone: WeakHashMap[K, E] = + throw new CloneNotSupportedException("The underlying map doesn't implement the Cloneable interface") +} |