Package gaiasky.util.gaia

Class BaseAttitudeDataServer<A extends Attitude>

java.lang.Object

gaiasky.util.gaia.BaseAttitudeDataServer<A>

Type Parameters:

A - type of Attitude that the server is serving

Direct Known Subclasses:

AnalyticalAttitudeDataServer, NumericalAttitudeDataServer

public abstract class BaseAttitudeDataServer<A extends Attitude>
extends java.lang.Object

Common base class for all attitude data servers. This holds all common fields e.g. the time origin for relative time scales (in ns) and implements getAttitude(long) in terms of getAttitude(long) which is the same for all servers. The time context and its possible switch is implemented in a thread-safe manner. Derived classes should hence be likewise thread-safe.

Field Summary

Fields

Modifier and Type	Field	Description
protected boolean	initialized	Some scanning laws have constants or tables for interpolation that need to be computed before the first use and recomputed after changing certain reference values.
protected TimeContext	initialRequestedTimeContext
protected TimeContext	nativeTimeContext	native and initially requested time context of the server - has to be set by the implementing class
protected boolean	withUncertaintiesCorrelations	switch to decide if attitude uncertainties and correlations should be calculated

Constructor Summary

Constructors

Constructor	Description
BaseAttitudeDataServer()

Method Summary

Modifier and Type	Method	Description
A	getAttitude(long time)
A	getAttitude(java.util.Date date)
protected abstract A	getAttitudeNative(long time)	Evaluate the attitude in the native time system of the server
long	getRefTime()
boolean	isInitialized()
void	setInitialized(boolean initialized)
void	setRefTime(long t)

Methods inherited from class java.lang.Object

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

Field Detail

initialized

protected boolean initialized

Some scanning laws have constants or tables for interpolation that need to be computed before the first use and recomputed after changing certain reference values. This flag indicates that the constants or tables (whatever applicable) are up to date.

nativeTimeContext

protected TimeContext nativeTimeContext

native and initially requested time context of the server - has to be set by the implementing class

initialRequestedTimeContext

protected TimeContext initialRequestedTimeContext

withUncertaintiesCorrelations

protected boolean withUncertaintiesCorrelations

switch to decide if attitude uncertainties and correlations should be calculated

Constructor Detail

BaseAttitudeDataServer

public BaseAttitudeDataServer()

Method Detail

isInitialized

public boolean isInitialized()

Returns:

Returns the initialised.

setInitialized

public void setInitialized(boolean initialized)

getAttitude

public A getAttitude(java.util.Date date)

getAttitude

public A getAttitude(long time)

Parameters:

time - The elapsed time in nanoseconds since J2010

getAttitudeNative

protected abstract A getAttitudeNative(long time)

Evaluate the attitude in the native time system of the server

setRefTime

public void setRefTime(long t)

Parameters:

t - Reference time in nanoseconds (jd)

getRefTime

public long getRefTime()

Returns:

The reference time in ns