alexh.weak

Class OptionalWeak<W extends Weak<W>>

java.lang.Object

alexh.weak.OptionalWeak<W>

public class OptionalWeak<W extends Weak<W>>
extends Object

Enhanced version of an Optional, similar methods to Weak that return Optionals and don't throw

Method Summary

Modifier and Type	Method and Description
<T> Optional<T>	as(Class<T> type) Returns inner value as optional of input type, if the inner value is absent or not an instance of the input type an empty optional is returned
<T> Optional<List<T>>	asList() Shortcut for as(List.class), with malleable generic type
<K,V> Optional<Map<K,V>>	asMap() Shortcut for as(Map.class), with malleable generic type
Optional<Object>	asObject()
Optional<String>	asString() Shortcut for as(String.class)
ConverterMaybe	convert()
static <T extends Weak<T>> OptionalWeak<T>	empty()
boolean	equals(Object o)
OptionalWeak<W>	filter(Predicate<? super W> predicate)
<U> Optional<U>	flatMap(Function<? super W,Optional<U>> mapper)
W	get()
int	hashCode()
void	ifPresent(Consumer<? super W> consumer)
boolean	isPresent()
<U> Optional<U>	map(Function<? super W,? extends U> mapper)
static <T extends Weak<T>> OptionalWeak<T>	of(T val)
W	orElse(W other)
W	orElseGet(Supplier<? extends W> other)
<X extends Throwable> W	orElseThrow(Supplier<? extends X> exceptionSupplier)
String	toString()

Methods inherited from class java.lang.Object

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

Method Detail

of

public static <T extends Weak<T>> OptionalWeak<T> of(T val)

empty

public static <T extends Weak<T>> OptionalWeak<T> empty()

get

public W get()

isPresent

public boolean isPresent()

ifPresent

public void ifPresent(Consumer<? super W> consumer)

filter

public OptionalWeak<W> filter(Predicate<? super W> predicate)

map

public <U> Optional<U> map(Function<? super W,? extends U> mapper)

See Also:

Optional.map(Function)

flatMap

public <U> Optional<U> flatMap(Function<? super W,Optional<U>> mapper)

See Also:

Optional.flatMap(Function)

orElse

public W orElse(W other)

See Also:

Optional.orElse(Object)

orElseGet

public W orElseGet(Supplier<? extends W> other)

See Also:

Optional.orElseGet(Supplier)

orElseThrow

public <X extends Throwable> W orElseThrow(Supplier<? extends X> exceptionSupplier)
                                    throws X extends Throwable

Throws:

X extends Throwable

See Also:

Optional.orElseThrow(Supplier)

asObject

public Optional<Object> asObject()

Returns:

inner value as an optional

as

public <T> Optional<T> as(Class<T> type)

Returns inner value as optional of input type, if the inner value is absent or not an instance of the input type an empty optional is returned

Type Parameters:

T - cast type

Parameters:

type - cast type

Returns:

inner value as optional of input type

asString

public Optional<String> asString()

Shortcut for as(String.class)

See Also:

as(Class)

asList

public <T> Optional<List<T>> asList()

Shortcut for as(List.class), with malleable generic type

See Also:

as(Class)

asMap

public <K,V> Optional<Map<K,V>> asMap()

Shortcut for as(Map.class), with malleable generic type

See Also:

as(Class)

convert

public ConverterMaybe convert()

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object