public class OptionalLong
extends ObjectGDK enhancements for OptionalLong.
| Type Params | Return Type | Name and description |
|---|---|---|
|
public OptionalLong |
filter(LongPredicate test)If a value is present in the OptionalLong, tests the value using
the given predicate and returns the optional if the test returns true or
else empty.
|
|
public long |
get()If a value is present in the OptionalLong, returns the value. |
<T> |
public Optional<T> |
mapToObj(LongFunction<? extends T> mapper)If a value is present in the OptionalLong, returns an Optional
consisting of the result of applying the given function to the value or else empty.
|
|
public OptionalLong |
peek(LongConsumer action)If a value is present in the OptionalLong, executes the specified
action with the value as input and then returns self. |
|
public LongStream |
stream()If a value is present in the OptionalLong, returns a LongStream with the value as its source or else an empty stream. |
| Methods inherited from class | Name |
|---|---|
class Object |
addShutdownHook, any, any, asBoolean, asType, collect, collect, collect, dump, each, eachMatch, eachMatch, eachWithIndex, every, every, find, find, findAll, findAll, findIndexOf, findIndexOf, findIndexValues, findIndexValues, findLastIndexOf, findLastIndexOf, findResult, findResult, findResult, findResult, getAt, getMetaClass, getMetaPropertyValues, getProperties, grep, grep, hasProperty, identity, inject, inject, inspect, invokeMethod, is, isCase, isNotCase, iterator, metaClass, print, print, printf, printf, println, println, println, putAt, respondsTo, respondsTo, setMetaClass, sleep, sleep, split, sprintf, sprintf, stream, tap, toString, use, use, use, with, with, withCloseable, withCloseable, withMethodClosure, withStream, withStream, withTraits |
If a value is present in the OptionalLong, tests the value using
the given predicate and returns the optional if the test returns true or
else empty.
assert !OptionalLong.empty().filter(n -> true).isPresent()
assert OptionalLong.of(123L).filter(n -> true).isPresent()
assert !OptionalLong.of(123L).filter(n -> false).isPresent()
assert OptionalLong.of(123L).filter(n -> true).getAsLong() == 123L
If a value is present in the OptionalLong, returns the value.
assert OptionalLong.of(1234L).get() == 1234L
If a value is present in the OptionalLong, returns an Optional
consisting of the result of applying the given function to the value or else empty.
assert !OptionalLong.empty().mapToObj(x -> new Object()).isPresent()
assert OptionalLong.of(123L).mapToObj(x -> new Object()).isPresent()
assert !OptionalLong.of(123L).mapToObj(x -> null).isPresent()
assert OptionalLong.of(1234L).mapToObj(Long::toString).get() == '1234'
If a value is present in the OptionalLong, executes the specified
action with the value as input and then returns self.
boolean called = false
def opt = OptionalLong.empty()
def out = opt.peek{ called = true }
assert out === opt
assert !called
opt = OptionalLong.of(42L)
out = opt.peek{ assert it == 42L; called = true }
assert out === opt
assert called
If a value is present in the OptionalLong, returns a LongStream with the value as its source or else an empty stream.