com.graphhopper.routing.lm

Class LMApproximator

java.lang.Object

com.graphhopper.routing.lm.LMApproximator

All Implemented Interfaces:

WeightApproximator

public class LMApproximator
extends Object
implements WeightApproximator

This class is a weight approximation based on precalculated landmarks.

Author:

Peter Karich

Constructor Summary

Constructors

Constructor and Description
LMApproximator(Graph graph, int maxBaseNodes, LandmarkStorage lms, int activeCount, double factor, boolean reverse)

Method Summary

Modifier and Type	Method and Description
double	approximate(int queryNode)
WeightApproximator	reverse() Makes a 'reverse' copy of itself to make it possible using the two objects independent e.g.
LMApproximator	setEpsilon(double epsilon) Increase approximation with higher epsilon
void	setTo(int to)
String	toString()
void	triggerActiveLandmarkRecalculation() This method forces a lazy recalculation of the active landmark set e.g.

Methods inherited from class java.lang.Object

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

Constructor Detail

LMApproximator

public LMApproximator(Graph graph,
                      int maxBaseNodes,
                      LandmarkStorage lms,
                      int activeCount,
                      double factor,
                      boolean reverse)

Method Detail

setEpsilon

public LMApproximator setEpsilon(double epsilon)

Increase approximation with higher epsilon

approximate

public double approximate(int queryNode)

Specified by:

approximate in interface WeightApproximator

Returns:

minimal weight of the specified currentNode to the 'to' node

setTo

public void setTo(int to)

Specified by:

setTo in interface WeightApproximator

reverse

public WeightApproximator reverse()

Description copied from interface: WeightApproximator

Makes a 'reverse' copy of itself to make it possible using the two objects independent e.g. on different threads. Do not copy state depending on the current approximate calls. 'reverse' means the WeightApproximator should handle approximate calls towards the 'from' instead towards the 'to'.

Specified by:

reverse in interface WeightApproximator

triggerActiveLandmarkRecalculation

public void triggerActiveLandmarkRecalculation()

This method forces a lazy recalculation of the active landmark set e.g. necessary after the 'to' node changed.

toString

public String toString()

Overrides:

toString in class Object