1 package org.opentrafficsim.road.gtu.lane.perception;
2
3 import java.util.HashSet;
4 import java.util.Iterator;
5 import java.util.Set;
6 import java.util.SortedSet;
7
8 import org.opentrafficsim.road.gtu.lane.perception.headway.Headway;
9
10 /**
11 * Simple implementation of {@code PerceptionIterable} which wraps a set. Constructors are available for an empty set, a
12 * single-valued set, or a sorted set.
13 * <p>
14 * Copyright (c) 2013-2019 Delft University of Technology, PO Box 5, 2600 AA, Delft, the Netherlands. All rights reserved. <br>
15 * BSD-style license. See <a href="http://opentrafficsim.org/node/13">OpenTrafficSim License</a>.
16 * <p>
17 * @version $Revision$, $LastChangedDate$, by $Author$, initial version 26 feb. 2018 <br>
18 * @author <a href="http://www.tbm.tudelft.nl/averbraeck">Alexander Verbraeck</a>
19 * @author <a href="http://www.tudelft.nl/pknoppers">Peter Knoppers</a>
20 * @author <a href="http://www.transport.citg.tudelft.nl">Wouter Schakel</a>
21 * @param <H> headway type
22 */
23 public class PerceptionIterableSet<H extends Headway> implements PerceptionIterable<H>
24 {
25
26 /** Internal set. */
27 private Set<H> set;
28
29 /**
30 * Creates an empty iterable.
31 */
32 public PerceptionIterableSet()
33 {
34 this.set = new HashSet<>();
35 }
36
37 /**
38 * Creates a single-value iterable.
39 * @param headway H; headway
40 */
41 public PerceptionIterableSet(final H headway)
42 {
43 this.set = new HashSet<>();
44 this.set.add(headway);
45 }
46
47 /**
48 * Creates an iterable from a sorted set.
49 * @param headways SortedSet<H>; set of headway
50 */
51 public PerceptionIterableSet(final SortedSet<H> headways)
52 {
53 this.set = headways;
54 }
55
56 /** {@inheritDoc} */
57 @Override
58 public Iterator<H> iterator()
59 {
60 return this.set.iterator();
61 }
62
63 /** {@inheritDoc} */
64 @Override
65 public H first()
66 {
67 return this.set.iterator().next();
68 }
69
70 /** {@inheritDoc} */
71 @Override
72 public boolean isEmpty()
73 {
74 return this.set.isEmpty();
75 }
76
77 }