Author: toad
Date: 2007-06-22 21:16:46 +0000 (Fri, 22 Jun 2007)
New Revision: 13717
Added:
trunk/freenet/src/freenet/support/WeakHashSet.java
Log:
WeakHashSet
Added: trunk/freenet/src/freenet/support/WeakHashSet.java
===================================================================
--- trunk/freenet/src/freenet/support/WeakHashSet.java
(rev 0)
+++ trunk/freenet/src/freenet/support/WeakHashSet.java 2007-06-22 21:16:46 UTC
(rev 13717)
@@ -0,0 +1,76 @@
+package freenet.support;
+
+import java.util.Collection;
+import java.util.Iterator;
+import java.util.Set;
+import java.util.WeakHashMap;
+
+public class WeakHashSet implements Set {
+
+ private WeakHashMap map;
+
+ public boolean add(Object key) {
+ return map.put(key, null) == null;
+ }
+
+ public boolean addAll(Collection arg0) {
+ boolean changed = false;
+ for(Iterator i=arg0.iterator();i.hasNext();) {
+ changed |= add(i.next());
+ }
+ return changed;
+ }
+
+ public void clear() {
+ map.clear();
+ }
+
+ public boolean contains(Object key) {
+ return map.containsKey(key);
+ }
+
+ public boolean containsAll(Collection arg0) {
+ for(Iterator i=arg0.iterator();i.hasNext();) {
+ if(!map.containsKey(i.next())) return false;
+ }
+ return true;
+ }
+
+ public boolean isEmpty() {
+ return map.isEmpty();
+ }
+
+ public Iterator iterator() {
+ return map.keySet().iterator();
+ }
+
+ public boolean remove(Object key) {
+ return map.remove(key) != null;
+ }
+
+ public boolean removeAll(Collection arg0) {
+ boolean changed = false;
+ for(Iterator i=arg0.iterator();i.hasNext();) {
+ changed |= remove(i.next());
+ }
+ return changed;
+ }
+
+ public boolean retainAll(Collection arg0) {
+ // FIXME
+ throw new UnsupportedOperationException();
+ }
+
+ public int size() {
+ return map.size();
+ }
+
+ public Object[] toArray() {
+ return map.keySet().toArray();
+ }
+
+ public Object[] toArray(Object[] arg0) {
+ return map.keySet().toArray(arg0);
+ }
+
+}
