Package org.apache.commons.functor

Basic functor interfaces.

See:
Description

Interface Summary

BinaryFunction<L,R,T>	A functor that takes two arguments and returns a value.
BinaryFunctor<L,R>	Marker interface for binary (two-argument) functors.
BinaryPredicate<L,R>	A functor that takes two arguments and returns a boolean value.
BinaryProcedure<L,R>	A functor that takes two arguments and has no return value.
Function<T>	A functor that takes no arguments and returns a value.
Functor	Functor marker interface.
NullaryFunctor	Marker interface for nullary (zero-argument) functors.
Predicate	A functor that takes no arguments and returns a boolean value.
Procedure	A functor that takes no arguments and returns no value.
UnaryFunction<A,T>	A functor that takes one argument and returns an Object value.
UnaryFunctor<A>	Marker interface for unary (single-argument) functors.
UnaryPredicate<A>	A functor that takes one argument and returns a boolean value.
UnaryProcedure<A>	A functor that takes one argument and returns no value.

Package org.apache.commons.functor Description

Basic functor interfaces.

Implementors are encouraged, but not strictly required, to make each functor implementation Serializable.

Note that each functor interface extends the Object.equals contract to state that equals can return true only if the specified Object implements the same functor interface and is known to produce the same results and/or side-effects for the same arguments (if any). Note that the default Object.equals implementation does in fact adhere to the functor equals contract.