1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
|
package bjc.utils.graph;
import java.util.Objects;
/**
* An edge in a weighted graph.
*
* @author ben
*
* @param <T> The type of the nodes in the graph.
*/
public class Edge<T, W> {
/* The distance from initial to terminal node. */
private final W distance;
/* The initial and terminal nodes of this edge. */
private final T source, target;
/**
* Create a new edge with set parameters.
*
* @param initial The initial node of the edge.
*
* @param terminal The terminal node of the edge.
*
* @param distance The distance between initial and terminal edge.
*/
public Edge(final T initial, final T terminal, final W distance) {
if (initial == null)
throw new NullPointerException("Initial node must not be null");
else if (terminal == null)
throw new NullPointerException("Terminal node must not be null");
this.source = initial;
this.target = terminal;
this.distance = distance;
}
/**
* Get the distance in this edge.
*
* @return The distance between the initial and terminal nodes of this edge.
*/
public W getDistance() {
return distance;
}
/**
* Get the initial node of an edge.
*
* @return The initial node of this edge.
*/
public T getSource() {
return source;
}
/**
* Get the target node of an edge.
*
* @return The target node of this edge.
*/
public T getTarget() {
return target;
}
@Override
public String toString() {
String msg = String.format("source vertex %s to target vertex %s with distance: %s", source, target, distance);
return msg;
}
@Override
public int hashCode() {
return Objects.hash(distance, source, target);
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
Edge<?, ?> other = (Edge<?, ?>) obj;
return Objects.equals(distance, other.distance) && Objects.equals(source, other.source)
&& Objects.equals(target, other.target);
}
}
|
