Package org.orekit.propagation.events.handlers

Class FieldRecallLastOccurrence<T extends CalculusFieldElement<T>>

java.lang.Object

org.orekit.propagation.events.handlers.FieldRecallLastOccurrence<T>

Type Parameters:

T - field type

All Implemented Interfaces:

FieldEventHandler<T>

public class FieldRecallLastOccurrence<T extends CalculusFieldElement<T>>
extends Object
implements FieldEventHandler<T>

Event handler wrapping another, arbitrary one whilst remembering date of last detection. If never used, the cache is null. If used but nothing detected, it returns past infinity in case of forward propagation and future infinity otherwise.

Since:

12.1

Author:

Romain Serra

See Also:

RecallLastOccurrence

Constructor Summary

Constructors

Constructor	Description
FieldRecallLastOccurrence(FieldEventHandler<T> wrappedHandler)	Constructor.

Method Summary

Modifier and Type	Method	Description
Action	eventOccurred(FieldSpacecraftState<T> s, FieldEventDetector<T> detector, boolean increasing)	Handle an event.
FieldAbsoluteDate<T>	getLastOccurrence()	Getter for last occurrence.
void	init(FieldSpacecraftState<T> initialState, FieldAbsoluteDate<T> target, FieldEventDetector<T> detector)	Initialize event handler at the start of a propagation.
FieldSpacecraftState<T>	resetState(FieldEventDetector<T> detector, FieldSpacecraftState<T> oldState)	Reset the state prior to continue propagation.

Methods inherited from class java.lang.Object

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

Constructor Detail

FieldRecallLastOccurrence

public FieldRecallLastOccurrence(FieldEventHandler<T> wrappedHandler)

Constructor.

Parameters:

wrappedHandler - event handler to wrap

Method Detail

getLastOccurrence

public FieldAbsoluteDate<T> getLastOccurrence()

Getter for last occurrence.

Returns:

last date when underlying event was detected

init

public void init(FieldSpacecraftState<T> initialState,
                 FieldAbsoluteDate<T> target,
                 FieldEventDetector<T> detector)

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 FieldEventHandler<T extends CalculusFieldElement<T>>

Parameters:

initialState - initial state

target - target date for the propagation

detector - event detector related to the event handler

eventOccurred

public Action eventOccurred(FieldSpacecraftState<T> s,
                            FieldEventDetector<T> detector,
                            boolean increasing)

Handle an event.

Specified by:

eventOccurred in interface FieldEventHandler<T extends CalculusFieldElement<T>>

Parameters:

s - SpaceCraft state to be used in the evaluation

detector - object with appropriate type that can be used in determining correct return state

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

resetState

public FieldSpacecraftState<T> resetState(FieldEventDetector<T> detector,
                                          FieldSpacecraftState<T> oldState)

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 FieldEventHandler.eventOccurred(org.orekit.propagation.FieldSpacecraftState<T>, org.orekit.propagation.events.FieldEventDetector<T>, boolean) has itself returned the 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 FieldEventHandler.eventOccurred(org.orekit.propagation.FieldSpacecraftState<T>, org.orekit.propagation.events.FieldEventDetector<T>, boolean) never returns the Action.RESET_STATE indicator, this function will never be called, and it is safe to simply return null.

The default implementation simply return its argument.

Specified by:

resetState in interface FieldEventHandler<T extends CalculusFieldElement<T>>

Parameters:

detector - object with appropriate type that can be used in determining correct return state

oldState - old state

Returns:

new state