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package bjc.utils.graph;
/**
* An edge in a weighted graph.
*
* @author ben
*
* @param <T>
* The type of the nodes in the graph.
*/
public class Edge<T> {
/* The distance from initial to terminal node. */
private final int 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 int 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;
}
@Override
public boolean equals(final Object obj) {
if(this == obj)
return true;
else if(obj == null)
return false;
else if(getClass() != obj.getClass())
return false;
else {
final Edge<?> other = (Edge<?>) obj;
if(distance != other.distance)
return false;
else if(source == null) {
if(other.source != null) return false;
} else if(!source.equals(other.source))
return false;
else if(target == null) {
if(other.target != null) return false;
} else if(!target.equals(other.target)) return false;
return true;
}
}
/**
* Get the distance in this edge.
*
* @return The distance between the initial and terminal nodes of this
* edge.
*/
public int 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 int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + distance;
result = prime * result + (source == null ? 0 : source.hashCode());
result = prime * result + (target == null ? 0 : target.hashCode());
return result;
}
@Override
public String toString() {
String msg = String.format("source vertex %s to target vertex %s with distance: %s", source, target,
distance);
return msg;
}
}
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