1 package org.opentrafficsim.road.gtu.lane.perception;
2
3 import java.util.Iterator;
4 import java.util.LinkedHashSet;
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) 2013-2024 Delft University of Technology, PO Box 5, 2600 AA, Delft, the Netherlands. All rights reserved. <br>
15 * BSD-style license. See <a href="https://opentrafficsim.org/docs/license.html">OpenTrafficSim License</a>.
16 * </p>
17 * @author <a href="https://github.com/averbraeck">Alexander Verbraeck</a>
18 * @author <a href="https://tudelft.nl/staff/p.knoppers-1">Peter Knoppers</a>
19 * @author <a href="https://github.com/wjschakel">Wouter Schakel</a>
20 * @param <H> headway type
21 */
22 public class PerceptionIterableSet<H extends Headway> implements PerceptionIterable<H>
23 {
24
25 /** Internal set. */
26 private Set<H> set;
27
28 /**
29 * Creates an empty iterable.
30 */
31 public PerceptionIterableSet()
32 {
33 this.set = new LinkedHashSet<>();
34 }
35
36 /**
37 * Creates a single-value iterable.
38 * @param headway H; headway
39 */
40 public PerceptionIterableSet(final H headway)
41 {
42 this.set = new LinkedHashSet<>();
43 this.set.add(headway);
44 }
45
46 /**
47 * Creates an iterable from a sorted set.
48 * @param headways SortedSet<H>; set of headway
49 */
50 public PerceptionIterableSet(final SortedSet<H> headways)
51 {
52 this.set = headways;
53 }
54
55 /** {@inheritDoc} */
56 @Override
57 public Iterator<H> iterator()
58 {
59 return this.set.iterator();
60 }
61
62 /** {@inheritDoc} */
63 @Override
64 public H first()
65 {
66 return this.set.iterator().next();
67 }
68
69 /** {@inheritDoc} */
70 @Override
71 public boolean isEmpty()
72 {
73 return this.set.isEmpty();
74 }
75
76 }