org.dmfs.jems.optional.decorators

Class Mapped<From,To>

java.lang.Object

org.dmfs.jems.optional.decorators.Mapped<From,To>

All Implemented Interfaces:

Optional<To>

public final class Mapped<From,To>
extends java.lang.Object
implements Optional<To>

Optional that maps an Optional if it's present using the given Function.

Constructor Summary

Constructors

Constructor and Description
Mapped(Function<From,To> conversion, Optional<From> fromValue)

Method Summary

Modifier and Type	Method and Description
boolean	isPresent() Returns whether the optional value is present.
To	value() Returns the optional value.
To	value(To defaultValue) Returns the optional value or the given default value if the optional value is not present.

Methods inherited from class java.lang.Object

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

Constructor Detail

Mapped

public Mapped(Function<From,To> conversion,
              Optional<From> fromValue)

Method Detail

isPresent

public boolean isPresent()

Description copied from interface: Optional

Returns whether the optional value is present.

Specified by:

isPresent in interface Optional<To>

Returns:

true if the value is present, false otherwise.

value

public To value()
         throws java.util.NoSuchElementException

Description copied from interface: Optional

Returns the optional value.

Specified by:

value in interface Optional<To>

Returns:

The value.

Throws:

java.util.NoSuchElementException - if the optional value is not present.

value

public To value(To defaultValue)

Description copied from interface: Optional

Returns the optional value or the given default value if the optional value is not present.

Parameters:

defaultValue - The value to return if the optional value is not present.

Returns:

The optional value or the default value.