1 package org.opentrafficsim.core.immutablecollections;
2
3 import java.util.Collection;
4 import java.util.EnumSet;
5 import java.util.HashSet;
6 import java.util.Set;
7
8 /**
9 * An immutable wrapper for a HashSet.
10 * <p>
11 * Copyright (c) 2013-2016 Delft University of Technology, PO Box 5, 2600 AA, Delft, the Netherlands. All rights reserved. <br>
12 * BSD-style license. See <a href="http://opentrafficsim.org/docs/license.html">OpenTrafficSim License</a>.
13 * </p>
14 * $LastChangedDate: 2015-07-24 02:58:59 +0200 (Fri, 24 Jul 2015) $, @version $Revision: 1147 $, by $Author: averbraeck $,
15 * initial version May 7, 2016 <br>
16 * @author <a href="http://www.tbm.tudelft.nl/averbraeck">Alexander Verbraeck</a>
17 * @author <a href="http://www.tudelft.nl/pknoppers">Peter Knoppers</a>
18 * @author <a href="http://www.transport.citg.tudelft.nl">Wouter Schakel</a>
19 * @param <E> the type of content of this Set
20 */
21 public class ImmutableHashSet<E> extends ImmutableAbstractSet<E>
22 {
23 /** */
24 private static final long serialVersionUID = 20160507L;
25
26 /**
27 * @param collection the set to use as the immutable set.
28 */
29 public ImmutableHashSet(final Collection<E> collection)
30 {
31 super(new HashSet<E>(collection));
32 }
33
34 /**
35 * @param collection the set to use as the immutable set.
36 */
37 public ImmutableHashSet(final ImmutableCollection<E> collection)
38 {
39 this(collection.toCollection());
40 }
41
42 /** {@inheritDoc} */
43 @Override
44 protected final HashSet<E> getSet()
45 {
46 return (HashSet<E>) super.getSet();
47 }
48
49 /** {@inheritDoc} */
50 @Override
51 public final Set<E> toSet()
52 {
53 return new HashSet<E>(getSet());
54 }
55
56 /** {@inheritDoc} */
57 @Override
58 public final String toString()
59 {
60 Set<E> set = getSet();
61 if (null == set)
62 {
63 return "ImmutableHashSet []";
64 }
65 return "ImmutableHashSet [" + set.toString() + "]";
66 }
67
68 }