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// by Apache
sclass WeakIdentityHashMap<K, V> implements Map<K, V> {
  private final ReferenceQueue<K> queue = new ReferenceQueue<K>();
  private Map<IdentityWeakReference, V> backingStore
    = new HashMap<IdentityWeakReference, V>();
    
  *() {
    _registerWeakMap(this);
  }

  public synchronized void clear() {
    backingStore.clear();
    reap();
  }

  public synchronized boolean containsKey(Object key) {
    reap();
    return backingStore.containsKey(new IdentityWeakReference(key));
  }

  public synchronized boolean containsValue(Object value)  {
    reap();
    return backingStore.containsValue(value);
  }

  public synchronized Set<Map.Entry<K, V>> entrySet() {
    reap();
    Set<Map.Entry<K, V>> ret = new HashSet<Map.Entry<K, V>>();
    for (Map.Entry<IdentityWeakReference, V> ref : backingStore.entrySet()) {
      final K key = ref.getKey().get();
      final V value = ref.getValue();
      Map.Entry<K, V> entry = new Map.Entry<K, V>() {
        public synchronized K getKey() {
          return key;
        }
        public synchronized V getValue() {
          return value;
        }
        public synchronized V setValue(V value) {
          throw new UnsupportedOperationException();
        }
      };
      ret.add(entry);
    }
    return Collections.unmodifiableSet(ret);
  }

  public synchronized Set<K> keySet() {
    reap();
    Set<K> ret = new HashSet<K>();
    for (IdentityWeakReference ref : backingStore.keySet()) {
      ret.add(ref.get());
    }
    return Collections.unmodifiableSet(ret);
  }

  public synchronized boolean equals(Object o) {
    if (!(o instanceof WeakIdentityHashMap)) {
      return false;
    }
    return backingStore.equals(((WeakIdentityHashMap)o).backingStore);
  }

  public synchronized V get(Object key) {
    reap();
    return backingStore.get(new IdentityWeakReference(key));
  }
  public synchronized V put(K key, V value) {
    reap();
    return backingStore.put(new IdentityWeakReference(key), value);
  }

  public synchronized int hashCode() {
    reap();
    return backingStore.hashCode();
  }
  public synchronized boolean isEmpty() {
    reap();
    return backingStore.isEmpty();
  }
  public synchronized void putAll(Map t) {
    throw new UnsupportedOperationException();
  }
  public synchronized V remove(Object key) {
    reap();
    return backingStore.remove(new IdentityWeakReference(key));
  }
  public synchronized int size() {
    reap();
    return backingStore.size();
  }
  public synchronized Collection<V> values() {
    reap();
    return backingStore.values();
  }

  private synchronized void reap() {
      Object zombie = queue.poll();

      while (zombie != null) {
        IdentityWeakReference victim = (IdentityWeakReference)zombie;
        backingStore.remove(victim);
        zombie = queue.poll();
      }
    }

  class IdentityWeakReference extends WeakReference<K> {
    int hash;

    @SuppressWarnings("unchecked")
      IdentityWeakReference(Object obj) {
      super((K)obj, queue);
      hash = System.identityHashCode(obj);
    }

    public synchronized int hashCode() {
      return hash;
    }

    public synchronized boolean equals(Object o) {
      if (this == o) {
        return true;
      }
      if (!(o instanceof WeakIdentityHashMap.IdentityWeakReference)) {
        return false;
      }
      IdentityWeakReference ref = (IdentityWeakReference)o;
      if (this.get() == ref.get()) {
        return true;
      }
      return false;
    }
  }
}