* </ul>
 */
@GwtIncompatible
interface ReferenceEntry<K, V> {
  /** Returns the value reference from this entry. */
  @Nullable ValueReference<K, V> getValueReference();

  /** Sets the value reference for this entry. */
  void setValueReference(ValueReference<K, V> valueReference);

  /** Returns the next entry in the chain. */
  @Nullable ReferenceEntry<K, V> getNext();

  /** Returns the entry's hash. */

      this.key = null;
    }

    private ValueReference<K, V> valueReference = unset();

    @Override
    public ValueReference<K, V> getValueReference() {
      return valueReference;
    }

    @Override
    public void setValueReference(ValueReference<K, V> valueReference) {
      this.valueReference = valueReference;
    }

    @Override

        newEntry.valueReference = entry.valueReference.copyFor(segment.queueForValues, newEntry);
        return newEntry;
      }

      @Override
      public void setValue(
          StrongKeyWeakValueSegment<K, V> segment, StrongKeyWeakValueEntry<K, V> entry, V value) {
        WeakValueReference<K, V, StrongKeyWeakValueEntry<K, V>> previous = entry.valueReference;

            (WeakValueEntry<Object, Object, ?>) segment.getEntry(keyOne, hashOne);
        WeakValueReference<Object, Object, ?> valueReference = entry.getValueReference();

        @SuppressWarnings("unchecked")
        Reference<Object> reference = (Reference<Object>) valueReference;
        reference.enqueue();

        map.put(keyTwo, valueTwo);
        assertFalse(map.containsKey(keyOne));

            (WeakValueEntry<Object, Object, ?>) segment.getEntry(keyOne, hashOne);
        WeakValueReference<Object, Object, ?> valueReference = entry.getValueReference();

        @SuppressWarnings("unchecked")
        Reference<Object> reference = (Reference<Object>) valueReference;
        reference.enqueue();

        map.put(keyTwo, valueTwo);
        assertFalse(map.containsKey(keyOne));