Distance

All Known Implementing Classes:

DijkstraDistance, DijkstraShortestPath, UnweightedShortestPath
```
public interface Distance<V>
```
An interface for classes which calculate the distance between one vertex and another.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`java.lang.Number`	`getDistance(V source, V target)`	Returns the distance from the `source` vertex to the `target` vertex.
`java.util.Map<V,java.lang.Number>`	`getDistanceMap(V source)`	Returns a `Map` which maps each vertex in the graph (including the `source` vertex) to its distance (represented as a Number) from `source`.

- Method Detail
  - getDistance
```
java.lang.Number getDistance(V source,
                             V target)
```
    Returns the distance from the source vertex to the target vertex. If target is not reachable from source, returns null.
    
    Parameters:
    
    source - the vertex from which distance is to be measured
    
    target - the vertex to which distance is to be measured
    
    Returns:
    
    the distance from source to target
  - getDistanceMap
```
java.util.Map<V,java.lang.Number> getDistanceMap(V source)
```
    Returns a Map which maps each vertex in the graph (including the source vertex) to its distance (represented as a Number) from source. If any vertex is not reachable from source, no distance is stored for that vertex.
    
    Parameters:
    
    source - the vertex from which distances are to be measured
    
    Returns:
    
    a Map of the distances from source to other vertices in the graph