oracle.spatial.network.lod

Interface HeuristicCostFunction

All Known Implementing Classes:

DummyCostFunction, EuclideanCostFunction, GeodeticCostFunction

public interface HeuristicCostFunction

This interface defines the heuristic cost function from one point to another. This interface is used in A* search and dynamic link level selector. This package provides two heuristic cost implementations for spatial networks: GeodeticCostFunction and EuclideanCostFunction. Users can provide their own cost estimates to guide the A* search. In order to guarantee optimality of A* search result, the heuristic cost from the current point to the target point must be smaller than the minimum cost from the current point to the target point.

Since:

11gR2

Method Summary

Modifier and Type	Method and Description
double	getHeuristicCost(HeavyPointOnNet currentPoint, HeavyPointOnNet targetPoint) Returns the heuristic cost from the current point to the target point.
int[]	getUserDataCategories() Returns the required user data categories.

Method Detail

getHeuristicCost

double getHeuristicCost(HeavyPointOnNet currentPoint,
                        HeavyPointOnNet targetPoint)

Returns the heuristic cost from the current point to the target point.

Parameters:

currentPoint - current point

targetPoint - target point

Returns:

estimated cost from current point to target point)

getUserDataCategories

int[] getUserDataCategories()

Returns the required user data categories.

Returns: