net.time4j.engine

Interface ChronoOperator<T>

Type Parameters:

T - generic type of entities this operator can be applied to

All Known Implementing Classes:

ElementOperator, StdOperator

public interface ChronoOperator<T>

Applies a functional calculation on chronological entities and yields the result as changed copy.

Technical note: This interface is only suitable in an Java-pre8-environment (that is Java 6 + 7) if the type T is constrained to a final type. Otherwise the compiler will fail when compiling expressions like entity.with(operator) due to limited support of type inference. This constraint does not exist with Java 8 and later.

Method Summary

Modifier and Type	Method and Description
T	apply(T entity) Adjusts given entity and yields a changed copy of argument.

Method Detail

apply

T apply(T entity)

Adjusts given entity and yields a changed copy of argument.

Will be called by ChronoEntity.with(ChronoOperator).

Parameters:

entity - chronological entity to be adjusted

Returns:

adjusted copy of argument which itself remains unaffected

Throws:

ChronoException - if there is no element rule for adjusting

java.lang.IllegalArgumentException - if any invalid value is tried

java.lang.ArithmeticException - in case of numerical overflow