01: /*
02: * Licensed to the Apache Software Foundation (ASF) under one
03: * or more contributor license agreements. See the NOTICE file
04: * distributed with this work for additional information
05: * regarding copyright ownership. The ASF licenses this file
06: * to you under the Apache License, Version 2.0 (the
07: * "License"); you may not use this file except in compliance
08: * with the License. You may obtain a copy of the License at
09: *
10: * http://www.apache.org/licenses/LICENSE-2.0
11: *
12: * Unless required by applicable law or agreed to in writing,
13: * software distributed under the License is distributed on an
14: * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15: * KIND, either express or implied. See the License for the
16: * specific language governing permissions and limitations
17: * under the License.
18: *
19: */
20: package org.apache.mina.util;
21:
22: import java.util.Collection;
23: import java.util.IdentityHashMap;
24: import java.util.Set;
25:
26: /**
27: * An {@link IdentityHashMap}-backed {@link Set}.
28: *
29: * @author The Apache MINA Project (dev@mina.apache.org)
30: * @version $Rev: 597692 $, $Date: 2007-11-23 08:56:32 -0700 (Fri, 23 Nov 2007) $
31: */
32: public class IdentityHashSet<E> extends MapBackedSet<E> {
33:
34: private static final long serialVersionUID = 6948202189467167147L;
35:
36: public IdentityHashSet() {
37: super (new IdentityHashMap<E, Boolean>());
38: }
39:
40: public IdentityHashSet(int expectedMaxSize) {
41: super (new IdentityHashMap<E, Boolean>(expectedMaxSize));
42: }
43:
44: public IdentityHashSet(Collection<E> c) {
45: super (new IdentityHashMap<E, Boolean>(), c);
46: }
47: }
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