org.jgrapht.alg

Class DijkstraShortestPath<V,E>

java.lang.Object

org.jgrapht.alg.DijkstraShortestPath<V,E>

public final class DijkstraShortestPath<V,E>
extends Object

An implementation of Dijkstra's shortest path algorithm using ClosestFirstIterator.

Since:

Sep 2, 2003

Author:

John V. Sichi

Constructor Summary

Constructors

Constructor and Description
DijkstraShortestPath(Graph<V,E> graph, V startVertex, V endVertex) Creates and executes a new DijkstraShortestPath algorithm instance.
DijkstraShortestPath(Graph<V,E> graph, V startVertex, V endVertex, double radius) Creates and executes a new DijkstraShortestPath algorithm instance.

Method Summary

Methods

Modifier and Type	Method and Description
static <V,E> List<E>	findPathBetween(Graph<V,E> graph, V startVertex, V endVertex) Convenience method to find the shortest path via a single static method call.
GraphPath<V,E>	getPath() Return the path found.
List<E>	getPathEdgeList() Return the edges making up the path found.
double	getPathLength() Return the weighted length of the path found.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

DijkstraShortestPath

public DijkstraShortestPath(Graph<V,E> graph,
                    V startVertex,
                    V endVertex)

Creates and executes a new DijkstraShortestPath algorithm instance. An instance is only good for a single search; after construction, it can be accessed to retrieve information about the path found.

Parameters:

graph - the graph to be searched

startVertex - the vertex at which the path should start

endVertex - the vertex at which the path should end

DijkstraShortestPath

public DijkstraShortestPath(Graph<V,E> graph,
                    V startVertex,
                    V endVertex,
                    double radius)

Creates and executes a new DijkstraShortestPath algorithm instance. An instance is only good for a single search; after construction, it can be accessed to retrieve information about the path found.

Parameters:

graph - the graph to be searched

startVertex - the vertex at which the path should start

endVertex - the vertex at which the path should end

radius - limit on weighted path length, or Double.POSITIVE_INFINITY for unbounded search

Method Detail

getPathEdgeList

public List<E> getPathEdgeList()

Return the edges making up the path found.

Returns:

List of Edges, or null if no path exists

getPath

public GraphPath<V,E> getPath()

Return the path found.

Returns:

path representation, or null if no path exists

getPathLength

public double getPathLength()

Return the weighted length of the path found.

Returns:

path length, or Double.POSITIVE_INFINITY if no path exists

findPathBetween

public static <V,E> List<E> findPathBetween(Graph<V,E> graph,
                            V startVertex,
                            V endVertex)

Convenience method to find the shortest path via a single static method call. If you need a more advanced search (e.g. limited by radius, or computation of the path length), use the constructor instead.

Parameters:

graph - the graph to be searched

startVertex - the vertex at which the path should start

endVertex - the vertex at which the path should end

Returns:

List of Edges, or null if no path exists