org.wicketstuff.lambda

Class OptionalFunction<T,R>

java.lang.Object

org.wicketstuff.lambda.OptionalFunction<T,R>

Type Parameters:

T - - the type of the input to the function

R - - the type of the result of the function

All Implemented Interfaces:

Serializable, Function<T,R>, SerializableFunction<T,R>

public class OptionalFunction<T,R>
extends Object
implements SerializableFunction<T,R>

SerializableFunction mapping T to R. Wraps a SerializableFunction mapping T to Optional<R>. The apply(T) method unwraps the Optional<R> value to either R or a default value if the Optional is null.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
OptionalFunction(SerializableFunction<T,Optional<R>> opFunction)
OptionalFunction(SerializableFunction<T,Optional<R>> opFunction, SerializableSupplier<R> defaultValueSupplier)

Method Summary

Modifier and Type	Method and Description
R	apply(T t)

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.function.Function

andThen, compose, identity

Constructor Detail

OptionalFunction

public OptionalFunction(SerializableFunction<T,Optional<R>> opFunction)

Parameters:

opFunction - ISerializableFunction mapping T to an Optional R value

OptionalFunction

public OptionalFunction(SerializableFunction<T,Optional<R>> opFunction,
                        SerializableSupplier<R> defaultValueSupplier)

Parameters:

opFunction - ISerializableFunction mapping T to an Optional R value

defaultValueSupplier - ISerializableSupplier that is invoked to provide a default value for the function if it returns null

Method Detail

apply

public R apply(T t)

Specified by:

apply in interface Function<T,R>