Package io.atlassian.fugue

Class Option.None

java.lang.Object

io.atlassian.fugue.Option<java.lang.Object>

io.atlassian.fugue.Option.None

All Implemented Interfaces:

Effect.Applicant<java.lang.Object>, Maybe<java.lang.Object>, java.io.Serializable, java.lang.Iterable<java.lang.Object>

Enclosing class:

Option<A>

static final class Option.None
extends Option<java.lang.Object>

One of the big two actual implementation classes.

Since:

4.2.0

Nested Class Summary

Nested classes/interfaces inherited from class io.atlassian.fugue.Option

Option.None, Option.Some<A>

Field Summary

Fields

Modifier and Type	Field	Description
private static Option<java.lang.Object>	NONE
private static long	serialVersionUID

Constructor Summary

Constructors

Constructor	Description
None()

Method Summary

Modifier and Type	Method	Description
boolean	contains(java.lang.Object elem)	Tests whether the option contains a given value as an element.
<B> B	fold(java.util.function.Supplier<? extends B> none, java.util.function.Function<? super java.lang.Object,? extends B> some)	If this is a some value apply the some function, otherwise get the None value.
void	foreach(Effect<? super java.lang.Object> effect)	Deprecated.
void	forEach(java.util.function.Consumer<? super java.lang.Object> effect)
java.lang.Object	get()	Get the value if defined.
java.lang.Object	getOrError(java.util.function.Supplier<java.lang.String> err)	Get the value or throws an error with the supplied message if not defined.
<X extends java.lang.Throwable> java.lang.Object	getOrThrow(java.util.function.Supplier<X> ifUndefined)	Get the value or throws the supplied throwable if not defined.
boolean	isDefined()	If the type contains a value return true.
private java.lang.Object	readResolve()
java.util.Optional<java.lang.Object>	toOptional()	Create an Optional from this option.
java.util.stream.Stream<java.lang.Object>	toStream()	Create a Stream from this option.

Methods inherited from class io.atlassian.fugue.Option

defined, equals, exists, filter, filterNot, flatMap, forall, fromOptional, getOr, getOrElse, getOrElse, getOrNull, hashCode, isEmpty, iterator, map, none, none, noneSupplier, option, orElse, orElse, some, toLeft, toRight, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.lang.Iterable

spliterator

Field Detail

serialVersionUID

private static final long serialVersionUID

See Also:

Constant Field Values

NONE

private static final Option<java.lang.Object> NONE

Constructor Detail

None

None()

Method Detail

fold

public <B> B fold(java.util.function.Supplier<? extends B> none,
                  java.util.function.Function<? super java.lang.Object,? extends B> some)

Description copied from class: Option

If this is a some value apply the some function, otherwise get the None value.

Specified by:

fold in class Option<java.lang.Object>

Type Parameters:

B - the result type

Parameters:

none - the supplier of the None type

some - the function to apply if this is a Some

Returns:

the appropriate value

get

public java.lang.Object get()

Description copied from interface: Maybe

Get the value if defined. Throw an exception otherwise.

Returns:

the wrapped value

isDefined

public boolean isDefined()

Description copied from interface: Maybe

If the type contains a value return true.

Returns:

true if this holds a value, false otherwise.

getOrError

public java.lang.Object getOrError(java.util.function.Supplier<java.lang.String> err)

Description copied from interface: Maybe

Get the value or throws an error with the supplied message if not defined.

Used when absolutely sure this is defined.

Parameters:

err - the message for the error.

Returns:

the contained value.

getOrThrow

public <X extends java.lang.Throwable> java.lang.Object getOrThrow(java.util.function.Supplier<X> ifUndefined)
                                                            throws X extends java.lang.Throwable

Description copied from interface: Maybe

Get the value or throws the supplied throwable if not defined.

Used when absolutely sure this is defined.

Type Parameters:

X - exception type

Parameters:

ifUndefined - the supplier of the throwable.

Returns:

the contained value.

Throws:

X - the throwable the supplier creates if there is no value.

X extends java.lang.Throwable

foreach

@Deprecated
public void foreach(Effect<? super java.lang.Object> effect)

Deprecated.

Description copied from interface: Effect.Applicant

Perform the given side-effect for each contained element.

Parameters:

effect - the input to use for performing the effect.

forEach

public void forEach(java.util.function.Consumer<? super java.lang.Object> effect)

toOptional

public java.util.Optional<java.lang.Object> toOptional()

Description copied from class: Option

Create an Optional from this option. Will throw a NullPointerException if this option is defined and contains a null value.

Specified by:

toOptional in class Option<java.lang.Object>

Returns:

Optional.of(Object) with the value if defined and not null, Optional.empty() if not defined.

toStream

public java.util.stream.Stream<java.lang.Object> toStream()

Description copied from class: Option

Create a Stream from this option.

Specified by:

toStream in class Option<java.lang.Object>

Returns:

Stream.of(Object) with the value if defined, Stream.empty() if not defined.

contains

public boolean contains(java.lang.Object elem)

Description copied from interface: Maybe

Tests whether the option contains a given value as an element.

Parameters:

elem - the element to test

Returns:

true if the option has an element that is equal to elem, false otherwise

readResolve

private java.lang.Object readResolve()