1 package org.djutils.event;
2
3 import java.io.Serializable;
4
5 import org.djutils.exceptions.Throw;
6
7 /**
8 * The TimedEvent is the reference implementation for a timed event. Because events are often sent over the network, the
9 * interface demands that the event, content and timestamp are serializable. It is the repsonsibility of the programmer, though,
10 * that the <b>fields</b> of the content and timestamp are serializable as well.
11 * <p>
12 * Copyright (c) 2002-2024 Delft University of Technology, Jaffalaan 5, 2628 BX Delft, the Netherlands. All rights reserved. See
13 * for project information <a href="https://djutils.org" target="_blank"> https://djutils.org</a>. The DJUTILS project is
14 * distributed under a three-clause BSD-style license, which can be found at
15 * <a href="https://djutils.org/docs/license.html" target="_blank"> https://djutils.org/docs/license.html</a>. This class was
16 * originally part of the DSOL project, see <a href="https://simulation.tudelft.nl/dsol/manual" target="_blank">
17 * https://simulation.tudelft.nl/dsol/manual</a>.
18 * </p>
19 * @author <a href="https://www.linkedin.com/in/peterhmjacobs">Peter Jacobs </a>
20 * @author <a href="https://www.tudelft.nl/averbraeck">Alexander Verbraeck</a>
21 * @param <T> the Comparable type that represents time
22 */
23 public class TimedEvent<T extends Comparable<T> & Serializable> extends Event implements Comparable<TimedEvent<T>>
24 {
25 /** The default serial version UID for serializable classes. */
26 private static final long serialVersionUID = 20140826L;
27
28 /** Time stamp of this TimedEvent. */
29 private final T timeStamp;
30
31 /**
32 * Construct a new timed event, where compliance with the metadata is verified.
33 * @param type EventType; the eventType of the event.
34 * @param content Serializable; the content of the event.
35 * @param timeStamp T; the timeStamp.
36 */
37 public TimedEvent(final EventType type, final Serializable content, final T timeStamp)
38 {
39 this(type, content, timeStamp, true);
40 }
41
42 /**
43 * Construct a new timed event, with a choice to verify compliance with metadata.
44 * @param type EventType; the eventType of the event.
45 * @param content Serializable; the content of the event.
46 * @param timeStamp T; the timeStamp.
47 * @param verifyMetaData boolean; whether to verify the compliance with metadata or not
48 */
49 public TimedEvent(final EventType type, final Serializable content, final T timeStamp, final boolean verifyMetaData)
50 {
51 super(type, content, verifyMetaData);
52 Throw.whenNull(timeStamp, "timeStamp cannot be null");
53 this.timeStamp = timeStamp;
54 }
55
56 /**
57 * Returns the timeStamp of this event.
58 * @return T; the time stamp
59 */
60 public T getTimeStamp()
61 {
62 return this.timeStamp;
63 }
64
65 @Override
66 public int hashCode()
67 {
68 final int prime = 31;
69 int result = super.hashCode();
70 result = prime * result + ((this.timeStamp == null) ? 0 : this.timeStamp.hashCode());
71 return result;
72 }
73
74 @Override
75 @SuppressWarnings("checkstyle:needbraces")
76 public boolean equals(final Object obj)
77 {
78 if (this == obj)
79 return true;
80 if (!super.equals(obj))
81 return false;
82 TimedEvent<?> other = (TimedEvent<?>) obj;
83 if (this.timeStamp == null)
84 {
85 if (other.timeStamp != null)
86 return false;
87 }
88 else if (!this.timeStamp.equals(other.timeStamp))
89 return false;
90 return true;
91 }
92
93 @Override
94 public int compareTo(final TimedEvent<T> o)
95 {
96 return this.timeStamp.compareTo(o.getTimeStamp());
97 }
98
99 @Override
100 public String toString()
101 {
102 return "[" + this.getClass().getName() + ";" + this.getType() + ";" + this.getContent() + ";" + this.getTimeStamp()
103 + "]";
104 }
105
106 }