- All Implemented Interfaces:
Serializable
,Comparable<Collector.Characteristics>
,Constable
Characteristics indicating properties of a
Collector
, which can
be used to optimize reduction implementations.-
Nested Class Summary
Nested classes/interfaces declared in class java.lang.Enum
Enum.EnumDesc<E extends Enum<E>>
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Enum Constant Summary
Enum ConstantDescriptionIndicates 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. -
Method Summary
Modifier and TypeMethodDescriptionstatic Collector.Characteristics
Returns the enum constant of this class with the specified name.static Collector.Characteristics[]
values()
Returns an array containing the constants of this enum class, in the order they are declared.
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Enum Constant Details
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CONCURRENT
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 alsoUNORDERED
, then it should only be evaluated concurrently if applied to an unordered data source. -
UNORDERED
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 aSet
.) -
IDENTITY_FINISH
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.
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Method Details
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values
Returns an array containing the constants of this enum class, in the order they are declared.- Returns:
- an array containing the constants of this enum class, in the order they are declared
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valueOf
Returns the enum constant of this class with the specified name. The string must match exactly an identifier used to declare an enum constant in this class. (Extraneous whitespace characters are not permitted.)- Parameters:
name
- the name of the enum constant to be returned.- Returns:
- the enum constant with the specified name
- Throws:
IllegalArgumentException
- if this enum class has no constant with the specified nameNullPointerException
- if the argument is null
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