Package org.orekit.propagation.events

Class DateDetector

java.lang.Object

org.orekit.propagation.events.AbstractDetector<DateDetector>

org.orekit.propagation.events.DateDetector

All Implemented Interfaces:

EventDetector, TimeStamped

public class DateDetector
extends AbstractDetector<DateDetector>
implements TimeStamped

Finder for date events.

This class finds date events (i.e. occurrence of some predefined dates).

As of version 5.1, it is an enhanced date detector:

• it can be defined without prior date (DateDetector(TimeStamped...))
• several dates can be added (addEventDate(AbsoluteDate))

The gap between the added dates must be more than the minGap.

The default implementation behavior is to stop propagation at the first event date occurrence. This can be changed by calling AbstractDetector.withHandler(EventHandler) after construction.

Author:

Luc Maisonobe, Pascal Parraud

See Also:

Propagator.addEventDetector(EventDetector)

Field Summary

Fields

Modifier and Type	Field	Description
static double	DEFAULT_MAX_CHECK	Default value for max check.
static double	DEFAULT_MIN_GAP	Default value for minimum gap between added dates.
static double	DEFAULT_THRESHOLD	Default value for convergence threshold.

Fields inherited from class org.orekit.propagation.events.AbstractDetector

DEFAULT_MAX_ITER, DEFAULT_MAXCHECK

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	DateDetector(AdaptableInterval maxCheck, double threshold, int maxIter, EventHandler handler, double minGap, TimeStamped... dates)	Protected constructor with full parameters.
	DateDetector(TimeStamped... dates)	Build a new instance.

Method Summary

Modifier and Type	Method	Description
void	addEventDate(AbsoluteDate target)	Add an event date.
protected DateDetector	create(AdaptableInterval newMaxCheck, double newThreshold, int newMaxIter, EventHandler newHandler)	Build a new instance.
double	g(SpacecraftState s)	Compute the value of the switching function.
AbsoluteDate	getDate()	Get the current event date according to the propagator.
List<TimeStamped>	getDates()	Get all event dates currently managed, in chronological order.
DateDetector	withMinGap(double newMinGap)	Setup minimum gap between added dates.

Methods inherited from class org.orekit.propagation.events.AbstractDetector

getHandler, getMaxCheckInterval, getMaxIterationCount, getThreshold, init, isForward, withHandler, withMaxCheck, withMaxCheck, withMaxIter, withThreshold

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.orekit.time.TimeStamped

durationFrom

Field Detail

DEFAULT_MAX_CHECK

public static final double DEFAULT_MAX_CHECK

Default value for max check.

Since:

12.0

See Also:

Constant Field Values

DEFAULT_MIN_GAP

public static final double DEFAULT_MIN_GAP

Default value for minimum gap between added dates.

Since:

12.0

See Also:

Constant Field Values

DEFAULT_THRESHOLD

public static final double DEFAULT_THRESHOLD

Default value for convergence threshold.

Since:

12.0

See Also:

Constant Field Values

Constructor Detail

DateDetector

public DateDetector(TimeStamped... dates)

Build a new instance.

First event dates are set here, but others can be added later with addEventDate(AbsoluteDate).

Parameters:

dates - list of event dates

Since:

12.0

See Also:

addEventDate(AbsoluteDate)

DateDetector

protected DateDetector(AdaptableInterval maxCheck,
                       double threshold,
                       int maxIter,
                       EventHandler handler,
                       double minGap,
                       TimeStamped... dates)

Protected constructor with full parameters.

This constructor is not public as users are expected to use the builder API with the various withXxx() methods to set up the instance in a readable manner without using a huge amount of parameters.

Parameters:

maxCheck - maximum checking interval

threshold - convergence threshold (s)

maxIter - maximum number of iterations in the event time search

handler - event handler to call at event occurrences

minGap - minimum gap between added dates (s)

dates - list of event dates

Since:

12.0

Method Detail

withMinGap

public DateDetector withMinGap(double newMinGap)

Setup minimum gap between added dates.

Parameters:

newMinGap - new minimum gap between added dates

Returns:

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

Since:

12.0

create

protected DateDetector create(AdaptableInterval newMaxCheck,
                              double newThreshold,
                              int newMaxIter,
                              EventHandler newHandler)

Build a new instance.

Specified by:

create in class AbstractDetector<DateDetector>

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

getDates

public List<TimeStamped> getDates()

Get all event dates currently managed, in chronological order.

Returns:

all event dates currently managed, in chronological order

Since:

11.1

g

public double g(SpacecraftState s)

Compute the value of the switching function. This function measures the difference between the current and the target date.

Specified by:

g in interface EventDetector

Specified by:

g in class AbstractDetector<DateDetector>

Parameters:

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

Returns:

value of the switching function

getDate

public AbsoluteDate getDate()

Get the current event date according to the propagator.

Specified by:

getDate in interface TimeStamped

Returns:

event date

addEventDate

public void addEventDate(AbsoluteDate target)
                  throws IllegalArgumentException

Add an event date.

The date to add must be:

• less than the smallest already registered event date minus the maxCheck
• or more than the largest already registered event date plus the maxCheck

Parameters:

target - target date

Throws:

IllegalArgumentException - if the date is too close from already defined interval

See Also:

DateDetector(TimeStamped...)