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oracle.spatial.network.lod
Class DynamicLinkLevelSelector

java.lang.Object
oracle.spatial.network.lod.DynamicLinkLevelSelector

All Implemented Interfaces:

LinkLevelSelector

public class DynamicLinkLevelSelector

extends java.lang.Object

implements LinkLevelSelector

This implementation of LinkLevelSelector dynamically assigns link level to the next node according to the distance from the next node to the start/end point.

Since:

Oracle Database 11g Release 2 (11.2)

Constructor Summary

DynamicLinkLevelSelector(NetworkAnalyst analyst, int maxLinkLevel, HeuristicCostFunction costFunction, double[] costThresholds, int numHighLevelNeighbors, double costMultiplier, LODNetworkConstraint constraint)
Returns a dynamic link level selector.

Method Summary

int	getLinkLevelToExpand(LODAnalysisInfo ai) Returns the link level for the next node to expend on.
int[]	getUserDataCategories() Returns the required user data categories.
boolean	requiresAnalysisInfo() Whether analysis info is required.
void	reset(HeavyPointOnNet[][] points) Resets the attributes of this link level selector according to the input points of interest.

Methods inherited from class java.lang.Object

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

Constructor Detail

DynamicLinkLevelSelector

public DynamicLinkLevelSelector(NetworkAnalyst analyst,
                                int maxLinkLevel,
                                HeuristicCostFunction costFunction,
                                double[] costThresholds,
                                int numHighLevelNeighbors,
                                double costMultiplier,
                                LODNetworkConstraint constraint)
                         throws LODNetworkException

Returns a dynamic link level selector.

Parameters:

maxLinkLevel - maximum link level to expand on

costFunction - heuristic cost function

costThresholds - cost threshold. If the heuristic cost from the start node to the end node is less than the costThresholds[i], then the link level to expand on is set to the link level i+1.

numHighLevelNeighbors - number of high level nodes to consider while computing the start and end cost threshold. The higher the value of this parameter, the more low level expansion will be used.

costMultiplier - cost mulitplier used to compute the start and end cost threshold. The higher the value of this parameter, the more low level expansions will be used.

Throws:

LODNetworkException

Method Detail

reset

public void reset(HeavyPointOnNet[][] points)
           throws LODNetworkException

Description copied from interface: LinkLevelSelector

Resets the attributes of this link level selector according to the input points of interest.

Specified by:

reset in interface LinkLevelSelector

Parameters:

points - points of interest. Each member of the array is an array of equivalent points. For example, in a road network, equivalent points can be the points on either side of a two way road.

Throws:

LODNetworkException

getLinkLevelToExpand

public int getLinkLevelToExpand(LODAnalysisInfo ai)
                         throws LODNetworkException

Description copied from interface: LinkLevelSelector

Returns the link level for the next node to expend on.

Specified by:

getLinkLevelToExpand in interface LinkLevelSelector

Parameters:

ai - analysis information

Returns:

Throws:

LODNetworkException

requiresAnalysisInfo

public boolean requiresAnalysisInfo()

Description copied from interface: LinkLevelSelector

Whether analysis info is required.

Specified by:

requiresAnalysisInfo in interface LinkLevelSelector

Returns:

true is analysis info cannot be null; false, otherwise.

getUserDataCategories

public int[] getUserDataCategories()

Description copied from interface: LinkLevelSelector

Returns the required user data categories.

Specified by:

getUserDataCategories in interface LinkLevelSelector

Returns:

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