Package org.orekit.propagation.events

Class FieldAbstractDetector<D extends FieldEventDetector<T>,T extends RealFieldElement<T>>

java.lang.Object

org.orekit.propagation.events.FieldAbstractDetector<D,T>

All Implemented Interfaces:

FieldEventDetector<T>

Direct Known Subclasses:

FieldAltitudeDetector, FieldApsideDetector, FieldDateDetector, FieldEclipseDetector, FieldElevationDetector, FieldNodeDetector

public abstract class FieldAbstractDetector<D extends FieldEventDetector<T>,T extends RealFieldElement<T>>
extends Object
implements FieldEventDetector<T>

Common parts shared by several orbital events finders.

Author:

Luc Maisonobe

See Also:

Propagator.addEventDetector(EventDetector)

Field Summary

Fields

Modifier and Type	Field	Description
static int	DEFAULT_MAX_ITER	Default cmaximum number of iterations in the event time search.
static double	DEFAULT_MAXCHECK	Default maximum checking interval (s).
static double	DEFAULT_THRESHOLD	Default convergence threshold (s).

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	FieldAbstractDetector(T maxCheck, T threshold, int maxIter, FieldEventHandler<? super D,T> handler)	Build a new instance.

Method Summary

Modifier and Type	Method	Description
protected abstract D	create(T newMaxCheck, T newThreshold, int newMaxIter, FieldEventHandler<? super D,T> newHandler)	Build a new instance.
FieldEventHandler.Action	eventOccurred(FieldSpacecraftState<T> s, boolean increasing)	Handle the event.
abstract T	g(FieldSpacecraftState<T> s)	Compute the value of the switching function.
FieldEventHandler<? super D,T>	getHandler()	Get the handler.
T	getMaxCheckInterval()	Get maximal time interval between switching function checks.
int	getMaxIterationCount()	Get maximal number of iterations in the event time search.
T	getThreshold()	Get the convergence threshold in the event time search.
void	init(FieldSpacecraftState<T> s0, FieldAbsoluteDate<T> t)	Initialize event handler at the start of a propagation.
boolean	isForward()	Check if the current propagation is forward or backward.
FieldSpacecraftState<T>	resetState(FieldSpacecraftState<T> oldState)	Reset the state prior to continue propagation.
D	withHandler(FieldEventHandler<? super D,T> newHandler)	Setup the event handler to call at event occurrences.
D	withMaxCheck(T newMaxCheck)	Setup the maximum checking interval.
D	withMaxIter(int newMaxIter)	Setup the maximum number of iterations in the event time search.
D	withThreshold(T newThreshold)	Setup the convergence threshold.

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_MAXCHECK

public static final double DEFAULT_MAXCHECK

Default maximum checking interval (s).

See Also:

Constant Field Values

DEFAULT_THRESHOLD

public static final double DEFAULT_THRESHOLD

Default convergence threshold (s).

See Also:

Constant Field Values

DEFAULT_MAX_ITER

public static final int DEFAULT_MAX_ITER

Default cmaximum number of iterations in the event time search.

See Also:

Constant Field Values

Constructor Detail

FieldAbstractDetector

protected FieldAbstractDetector(T maxCheck,
                                T threshold,
                                int maxIter,
                                FieldEventHandler<? super D,T> handler)

Build a new instance.

Parameters:

maxCheck - maximum checking interval (s)

threshold - convergence threshold (s)

maxIter - maximum number of iterations in the event time search

handler - event handler to call at event occurrences

Method Detail

init

public void init(FieldSpacecraftState<T> s0,
                 FieldAbsoluteDate<T> t)
          throws OrekitException

Initialize event handler at the start of a propagation.

This method is called once at the start of the propagation. It may be used by the event handler to initialize some internal data if needed.

The default implementation does nothing

Specified by:

init in interface FieldEventDetector<D extends FieldEventDetector<T>>

Parameters:

s0 - initial state

t - target time for the integration

Throws:

OrekitException - if some specific error occurs

g

public abstract T g(FieldSpacecraftState<T> s)
             throws OrekitException

Compute the value of the switching function. This function must be continuous (at least in its roots neighborhood), as the integrator will need to find its roots to locate the events.

Specified by:

g in interface FieldEventDetector<D extends FieldEventDetector<T>>

Parameters:

s - the current state information: date, kinematics, attitude

Returns:

value of the switching function

Throws:

OrekitException - if some specific error occurs

getMaxCheckInterval

public T getMaxCheckInterval()

Get maximal time interval between switching function checks.

Specified by:

getMaxCheckInterval in interface FieldEventDetector<D extends FieldEventDetector<T>>

Returns:

maximal time interval (s) between switching function checks

getMaxIterationCount

public int getMaxIterationCount()

Get maximal number of iterations in the event time search.

Specified by:

getMaxIterationCount in interface FieldEventDetector<D extends FieldEventDetector<T>>

Returns:

maximal number of iterations in the event time search

getThreshold

public T getThreshold()

Get the convergence threshold in the event time search.

Specified by:

getThreshold in interface FieldEventDetector<D extends FieldEventDetector<T>>

Returns:

convergence threshold (s)

withMaxCheck

public D withMaxCheck(T newMaxCheck)

Setup the maximum checking interval.

This will override a maximum checking interval if it has been configured previously.

Parameters:

newMaxCheck - maximum checking interval (s)

Returns:

a new detector with updated configuration (the instance is not changed)

Since:

6.1

withMaxIter

public D withMaxIter(int newMaxIter)

Setup the maximum number of iterations in the event time search.

This will override a number of iterations if it has been configured previously.

Parameters:

newMaxIter - maximum number of iterations in the event time search

Returns:

a new detector with updated configuration (the instance is not changed)

Since:

6.1

withThreshold

public D withThreshold(T newThreshold)

Setup the convergence threshold.

This will override a convergence threshold if it has been configured previously.

Parameters:

newThreshold - convergence threshold (s)

Returns:

a new detector with updated configuration (the instance is not changed)

Since:

6.1

withHandler

public D withHandler(FieldEventHandler<? super D,T> newHandler)

Setup the event handler to call at event occurrences.

This will override a handler if it has been configured previously.

Parameters:

newHandler - event handler to call at event occurrences

Returns:

a new detector with updated configuration (the instance is not changed)

Since:

6.1

getHandler

public FieldEventHandler<? super D,T> getHandler()

Get the handler.

Returns:

event handler to call at event occurrences

eventOccurred

public FieldEventHandler.Action eventOccurred(FieldSpacecraftState<T> s,
                                              boolean increasing)
                                       throws OrekitException

Handle the event.

Specified by:

eventOccurred in interface FieldEventDetector<D extends FieldEventDetector<T>>

Parameters:

s - SpaceCraft state to be used in the evaluation

increasing - with the event occurred in an "increasing" or "decreasing" slope direction

Returns:

the Action that the calling detector should pass back to the evaluation system

Throws:

OrekitException - if some specific error occurs

resetState

public FieldSpacecraftState<T> resetState(FieldSpacecraftState<T> oldState)
                                   throws OrekitException

Reset the state prior to continue propagation.

This method is called after the step handler has returned and before the next step is started, but only when FieldEventDetector.eventOccurred(org.orekit.propagation.FieldSpacecraftState<T>, boolean) has itself returned the FieldEventHandler.Action.RESET_STATE indicator. It allows the user to reset the state for the next step, without perturbing the step handler of the finishing step. If the FieldEventDetector.eventOccurred(org.orekit.propagation.FieldSpacecraftState<T>, boolean) never returns the FieldEventHandler.Action.RESET_STATE indicator, this function will never be called, and it is safe to simply return null.

The default implementation simply returns its argument.

Specified by:

resetState in interface FieldEventDetector<D extends FieldEventDetector<T>>

Parameters:

oldState - old state

Returns:

new state

Throws:

OrekitException - if the state cannot be reseted

create

protected abstract D create(T newMaxCheck,
                            T newThreshold,
                            int newMaxIter,
                            FieldEventHandler<? super D,T> newHandler)

Build a new instance.

Parameters:

newMaxCheck - maximum checking interval (s)

newThreshold - convergence threshold (s)

newMaxIter - maximum number of iterations in the event time search

newHandler - event handler to call at event occurrences

Returns:

a new instance of the appropriate sub-type

isForward

public boolean isForward()

Check if the current propagation is forward or backward.

Returns:

true if the current propagation is forward

Since:

7.2