net.time4j.engine

Interface ChronoFunction<T,R>

Type Parameters:

T - generic type of source

R - generic type of result

public interface ChronoFunction<T,R>

Represents any temporal query using the strategy pattern approach.

See Also:

ChronoEntity.get(ChronoFunction)

Method Summary

Modifier and Type	Method and Description
R	apply(T context) Reads and evaluates given time value context to a specific result of type R.

Method Detail

apply

R apply(T context)

Reads and evaluates given time value context to a specific result of type R.

Will be called by ChronoEntity.get(ChronoFunction). Concrete implementations must document if they rather yield null or throw an exception in case of undefined results.

Parameters:

context - time context to be evaluated

Returns:

result of query or null if undefined

Throws:

ChronoException - if this query is not executable