Package org.orekit.utils

Interface TimeStampedCache<T extends TimeStamped>

Type Parameters:

T - the type of data

All Known Implementing Classes:

GenericTimeStampedCache, ImmutableTimeStampedCache

public interface TimeStampedCache<T extends TimeStamped>

Interface for a data structure that can provide concurrent access to TimeStamped data surrounding a given date.

Author:

Luc Maisonobe, Evan Ward

See Also:

GenericTimeStampedCache, ImmutableTimeStampedCache

Method Summary

Modifier and Type	Method	Description
T	getEarliest()	Get the earliest entry in this cache.
T	getLatest()	Get the latest entry in this cache.
Stream<T>	getNeighbors(AbsoluteDate central)	Get the entries surrounding a central date.
int	getNeighborsSize()	Get the fixed size of the lists returned by getNeighbors(AbsoluteDate).

Method Detail

getNeighbors

Stream<T> getNeighbors(AbsoluteDate central)
                throws TimeStampedCacheException

Get the entries surrounding a central date.

If the central date is well within covered range, the returned array will be balanced with half the points before central date and half the points after it (depending on n parity, of course). If the central date is near the boundary, then the returned array will be unbalanced and will contain only the n earliest (or latest) entries. A typical example of the later case is leap seconds cache, since the number of leap seconds cannot be arbitrarily increased.

This method is safe for multiple threads to execute concurrently.

Parameters:

central - central date

Returns:

list of cached entries surrounding the specified date. The size of the list is guaranteed to be getNeighborsSize().

Throws:

TimeStampedCacheException - if central is outside the range of data this cache is capable of providing.

getNeighborsSize

int getNeighborsSize()

Get the fixed size of the lists returned by getNeighbors(AbsoluteDate).

Returns:

size of the list

getEarliest

T getEarliest()
       throws IllegalStateException

Get the earliest entry in this cache.

Returns:

earliest cached entry

Throws:

IllegalStateException - if this cache is empty

getLatest

T getLatest()
     throws IllegalStateException

Get the latest entry in this cache.

Returns:

latest cached entry

Throws:

IllegalStateException - if this cache is empty