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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 eistimates to guide the A* search. In order to guarantee optimality of A* search result, the heuristic cost from the current point to the goal point must be smaller than the minimum cost from the current point to the goal point.

Since:

Oracle Database 11g Release 2 (11.2)

Method Summary

double	getHeuristicCost(HeavyPointOnNet currentPoint, HeavyPointOnNet goalPoint) Returns the heuristic cost from the current point to the goal point.
int[]	getUserDataCategories() Returns the required user data categories.

Method Detail

getHeuristicCost

double getHeuristicCost(HeavyPointOnNet currentPoint,
                        HeavyPointOnNet goalPoint)

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

Parameters:

currentPoint - current point

goalPoint - goal point

Returns:

emtimated cost from current node to goal node)

getUserDataCategories

int[] getUserDataCategories()

Returns the required user data categories.

Returns:

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