com.graphhopper.matching.util

Class TimeStep<S,O,D>

java.lang.Object

com.graphhopper.matching.util.TimeStep<S,O,D>

Type Parameters:

S - road position type, which corresponds to the HMM state.

O - location measurement type, which corresponds to the HMM observation.

D - road path object

public class TimeStep<S,O,D>
extends Object

Contains everything the hmm-lib needs to process a new time step including emisson and observation probabilities.

Field Summary

Fields

Modifier and Type	Field and Description
Collection<S>	candidates State candidates at this time step.
Map<S,Double>	emissionLogProbabilities
O	observation Observation made at this time step.
Map<Transition<S>,D>	roadPaths Road paths between all candidates pairs of the previous and the current time step.
Map<Transition<S>,Double>	transitionLogProbabilities

Constructor Summary

Constructors

Constructor and Description
TimeStep(O observation, Collection<S> candidates)

Method Summary

Modifier and Type	Method and Description
void	addEmissionLogProbability(S candidate, double emissionLogProbability)
void	addRoadPath(S fromPosition, S toPosition, D roadPath) Does not need to be called for non-existent transitions.
void	addTransitionLogProbability(S fromPosition, S toPosition, double transitionLogProbability) Does not need to be called for non-existent transitions.

Methods inherited from class java.lang.Object

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

Field Detail

observation

public final O observation

Observation made at this time step.

candidates

public final Collection<S> candidates

State candidates at this time step.

emissionLogProbabilities

public final Map<S,Double> emissionLogProbabilities

transitionLogProbabilities

public final Map<Transition<S>,Double> transitionLogProbabilities

roadPaths

public final Map<Transition<S>,D> roadPaths

Road paths between all candidates pairs of the previous and the current time step.

Constructor Detail

TimeStep

public TimeStep(O observation,
                Collection<S> candidates)

Method Detail

addEmissionLogProbability

public void addEmissionLogProbability(S candidate,
                                      double emissionLogProbability)

addTransitionLogProbability

public void addTransitionLogProbability(S fromPosition,
                                        S toPosition,
                                        double transitionLogProbability)

Does not need to be called for non-existent transitions.

addRoadPath

public void addRoadPath(S fromPosition,
                        S toPosition,
                        D roadPath)

Does not need to be called for non-existent transitions.