--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/base/src/java/util/HashSet.d	Sat Mar 21 11:33:57 2009 +0100
@@ -0,0 +1,178 @@
+module java.util.HashSet;
+
+import java.lang.all;
+import java.util.Set;
+import java.util.Collection;
+import java.util.Iterator;
+
+version(Tango){
+    static import tango.util.container.HashSet;
+} else { // Phobos
+}
+
+class HashSet : Set {
+    version(Tango){
+        alias tango.util.container.HashSet.HashSet!(Object) SetType;
+        private SetType set;
+    } else { // Phobos
+    }
+
+    public this(){
+        version(Tango){
+            set = new SetType();
+        } else { // Phobos
+            implMissing( __FILE__, __LINE__ );
+        }
+    }
+    public this(Collection c){
+        implMissing( __FILE__, __LINE__ );
+    }
+    public this(int initialCapacity){
+        implMissing( __FILE__, __LINE__ );
+    }
+    public this(int initialCapacity, float loadFactor){
+        implMissing( __FILE__, __LINE__ );
+    }
+    public bool    add(Object o){
+        version(Tango){
+            return set.add(o);
+        } else { // Phobos
+            implMissing( __FILE__, __LINE__ );
+            return false;
+        }
+    }
+    public bool    add(String o){
+        return add(stringcast(o));
+    }
+    public bool    addAll(Collection c){
+        implMissing( __FILE__, __LINE__ );
+        return false;
+    }
+    public void   clear(){
+        version(Tango){
+            set.clear();
+        } else { // Phobos
+            implMissing( __FILE__, __LINE__ );
+        }
+    }
+    public bool    contains(Object o){
+        version(Tango){
+            return set.contains(o);
+        } else { // Phobos
+            implMissing( __FILE__, __LINE__ );
+            return false;
+        }
+    }
+    public bool     contains(String o){
+        return contains(stringcast(o));
+    }
+    public bool    containsAll(Collection c){
+        implMissing( __FILE__, __LINE__ );
+        return false;
+    }
+    public override equals_t    opEquals(Object o){
+        implMissing( __FILE__, __LINE__ );
+        return 0;
+    }
+    public override hash_t    toHash(){
+        implMissing( __FILE__, __LINE__ );
+        return 0;
+    }
+    public bool    isEmpty(){
+        version(Tango){
+            return set.isEmpty();
+        } else { // Phobos
+            implMissing( __FILE__, __LINE__ );
+            return false;
+        }
+    }
+    version(Tango){
+        class LocalIterator : Iterator {
+            SetType.Iterator iter;
+            Object nextElem;
+            this( SetType.Iterator iter){
+                this.iter = iter;
+            }
+            public bool hasNext(){
+                return iter.next(nextElem);
+            }
+            public Object next(){
+                return nextElem;
+            }
+            public void  remove(){
+                iter.remove();
+            }
+        }
+    } else { // Phobos
+    }
+    public Iterator   iterator(){
+        version(Tango){
+            return new LocalIterator(set.iterator());
+        } else { // Phobos
+            implMissing( __FILE__, __LINE__ );
+            return null;
+        }
+    }
+    public bool    remove(Object o){
+        version(Tango){
+            return set.remove(o);
+        } else { // Phobos
+            implMissing( __FILE__, __LINE__ );
+            return false;
+        }
+    }
+    public bool remove(String key){
+        return remove(stringcast(key));
+    }
+    public bool    removeAll(Collection c){
+        implMissing( __FILE__, __LINE__ );
+        return false;
+    }
+    public bool    retainAll(Collection c){
+        implMissing( __FILE__, __LINE__ );
+        return false;
+    }
+    public int    size(){
+        version(Tango){
+            return set.size();
+        } else { // Phobos
+            implMissing( __FILE__, __LINE__ );
+            return 0;
+        }
+    }
+    public Object[]   toArray(){
+        version(Tango){
+            Object[] res;
+            res.length = size();
+            int idx = 0;
+            foreach( o; set ){
+                res[idx] = o;
+                idx++;
+            }
+            return res;
+        } else { // Phobos
+            implMissing( __FILE__, __LINE__ );
+            return null;
+        }
+    }
+    public Object[]   toArray(Object[] a){
+        implMissing( __FILE__, __LINE__ );
+        return null;
+    }
+    public override String toString(){
+        implMissing( __FILE__, __LINE__ );
+        return null;
+    }
+
+    // only for D
+    public int opApply (int delegate(ref Object value) dg){
+        version(Tango){
+            return set.opApply(dg);
+        } else { // Phobos
+            implMissing( __FILE__, __LINE__ );
+            return 0;
+        }
+    }
+
+}
+