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:

Oracle Database 11g Release 2 (11.2)

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.
void	setUserData(PointOnNet point, NetworkExplorer ne) Sets the user data needed by the heuristic cost function for the input point.

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:

setUserData

void setUserData(PointOnNet point,
                 NetworkExplorer ne)
          throws LODNetworkException

Sets the user data needed by the heuristic cost function for the input point.

Parameters:

point -

Throws:

LODNetworkException