1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. You may obtain a copy of the License at
9 *
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 * @param <E> The element type
30 *
31 * @author <a href="http://mina.apache.org">Apache MINA Project</a>
32 */
33 public class IdentityHashSet<E> extends MapBackedSet<E> {
34 private static final long serialVersionUID = 6948202189467167147L;
35
36 /**
37 * Creates a new IdentityHashSet instance
38 */
39 public IdentityHashSet() {
40 super(new IdentityHashMap<E, Boolean>());
41 }
42
43 /**
44 * Creates a new IdentityHashSet instance
45 *
46 * @param expectedMaxSize The maximum size for the map
47 */
48 public IdentityHashSet(int expectedMaxSize) {
49 super(new IdentityHashMap<E, Boolean>(expectedMaxSize));
50 }
51
52 /**
53 * Creates a new IdentityHashSet instance
54 *
55 * @param c The elements to put in the map
56 */
57 public IdentityHashSet(Collection<E> c) {
58 super(new IdentityHashMap<E, Boolean>(), c);
59 }
60 }