Characteristics
class Characteristics
kotlin.Any | ||
↳ | kotlin.Enum<java.util.stream.Collector.Characteristics> | |
↳ | java.util.stream.Collector.Characteristics |
Characteristics indicating properties of a Collector
, which can be used to optimize reduction implementations.
Summary
Enum values | |
---|---|
Indicates that this collector is concurrent, meaning that the result container can support the accumulator function being called concurrently with the same result container from multiple threads. |
|
Indicates that the finisher function is the identity function and can be elided. |
|
Indicates that the collection operation does not commit to preserving the encounter order of input elements. |
Enum values
CONCURRENT
enum val CONCURRENT : Collector.Characteristics
Indicates that this collector is concurrent, meaning that the result container can support the accumulator function being called concurrently with the same result container from multiple threads.
If a CONCURRENT
collector is not also UNORDERED
, then it should only be evaluated concurrently if applied to an unordered data source.
IDENTITY_FINISH
enum val IDENTITY_FINISH : Collector.Characteristics
Indicates that the finisher function is the identity function and can be elided. If set, it must be the case that an unchecked cast from A to R will succeed.
UNORDERED
enum val UNORDERED : Collector.Characteristics
Indicates that the collection operation does not commit to preserving the encounter order of input elements. (This might be true if the result container has no intrinsic order, such as a Set
.)