org.placelab.client.tracker
Class PositionTracker

java.lang.Object
  org.placelab.client.tracker.Tracker
      org.placelab.client.tracker.PositionTracker

All Implemented Interfaces:

SpotterListener

public class PositionTracker

extends Tracker

A Tracker that takes PositionMeasurement objects and returns the latest measurement as its estimate of position.

Constructor Summary

PositionTracker()

Method Summary

boolean	acceptableMeasurement(Measurement m) Returns true if the tracker can make use of this reading to meaningfully update the estimate.
Estimate	getEstimate()
protected void	resetImpl() Subclasses should implement this to reset themselves to their initial state.
java.lang.String	toString()
void	updateEstimateImpl(Measurement m) Subclasses should implement this to do the actual work of updating their Estimate with the given Measurement.
void	updateWithoutMeasurement(long durationMillis) This method notifies a tracker that time has elapsed without a new mesurement.

Methods inherited from class org.placelab.client.tracker.Tracker

addEstimateListener, fireEstimateUpdate, getLastUpdatedTime, gotMeasurement, numberOfMeasurements, removeEstimateListener, reset, spotterExceptionThrown, updateEstimate

Methods inherited from class java.lang.Object

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

Constructor Detail

PositionTracker

public PositionTracker()

Method Detail

toString

public java.lang.String toString()

updateEstimateImpl

public void updateEstimateImpl(Measurement m)

Description copied from class: Tracker

Subclasses should implement this to do the actual work of updating their Estimate with the given Measurement.

Specified by:

updateEstimateImpl in class Tracker

Parameters:

m - use this to update your Estimate

getEstimate

public Estimate getEstimate()

Specified by:

getEstimate in class Tracker

Returns:

The Tracker's latest Estimate

acceptableMeasurement

public boolean acceptableMeasurement(Measurement m)

Description copied from class: Tracker

Returns true if the tracker can make use of this reading to meaningfully update the estimate.

Specified by:

acceptableMeasurement in class Tracker

updateWithoutMeasurement

public void updateWithoutMeasurement(long durationMillis)

Description copied from class: Tracker

This method notifies a tracker that time has elapsed without a new mesurement. This gives the tracker a chance to update its estimate to account for predicted motion.

Specified by:

updateWithoutMeasurement in class Tracker

resetImpl

protected void resetImpl()

Description copied from class: Tracker

Subclasses should implement this to reset themselves to their initial state.

Specified by:

resetImpl in class Tracker