Package it.unimi.dsi.fastutil.longs
Class Long2ReferenceFunctions
java.lang.Object
it.unimi.dsi.fastutil.longs.Long2ReferenceFunctions
A class providing static methods and objects that do useful things with type-specific functions.
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Nested Class Summary
Modifier and TypeClassDescriptionstatic class
An immutable class representing an empty type-specific function.static class
An adapter for mapping generic total functions to partial primitive functions.static class
An immutable class representing a type-specific singleton function.static class
A synchronized wrapper class for functions.static class
An unmodifiable wrapper class for functions. -
Field Summary
Modifier and TypeFieldDescriptionstatic final Long2ReferenceFunctions.EmptyFunction
An empty type-specific function (immutable). -
Method Summary
Modifier and TypeMethodDescriptionstatic <V> Long2ReferenceFunction<V>
Returns a (partial) type-specific function based on the given total generic function.static <V> Long2ReferenceFunction<V>
singleton
(long key, V value) Returns a type-specific immutable function containing only the specified pair.static <V> Long2ReferenceFunction<V>
Returns a type-specific immutable function containing only the specified pair.static <V> Long2ReferenceFunction<V>
Returns a synchronized type-specific function backed by the given type-specific function.static <V> Long2ReferenceFunction<V>
synchronize
(Long2ReferenceFunction<V> f, Object sync) Returns a synchronized type-specific function backed by the given type-specific function, using an assigned object to synchronize.static <V> Long2ReferenceFunction<V>
unmodifiable
(Long2ReferenceFunction<? extends V> f) Returns an unmodifiable type-specific function backed by the given type-specific function.
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Field Details
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EMPTY_FUNCTION
An empty type-specific function (immutable). It is serializable and cloneable.
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Method Details
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singleton
Returns a type-specific immutable function containing only the specified pair. The returned function is serializable and cloneable.Note that albeit the returned function is immutable, its default return value may be changed.
- Parameters:
key
- the only key of the returned function.value
- the only value of the returned function.- Returns:
- a type-specific immutable function containing just the pair
<key,value>
.
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singleton
Returns a type-specific immutable function containing only the specified pair. The returned function is serializable and cloneable.Note that albeit the returned function is immutable, its default return value may be changed.
- Parameters:
key
- the only key of the returned function.value
- the only value of the returned function.- Returns:
- a type-specific immutable function containing just the pair
<key,value>
.
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synchronize
Returns a synchronized type-specific function backed by the given type-specific function.- Parameters:
f
- the function to be wrapped in a synchronized function.- Returns:
- a synchronized view of the specified function.
- See Also:
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synchronize
Returns a synchronized type-specific function backed by the given type-specific function, using an assigned object to synchronize.- Parameters:
f
- the function to be wrapped in a synchronized function.sync
- an object that will be used to synchronize the access to the function.- Returns:
- a synchronized view of the specified function.
- See Also:
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unmodifiable
Returns an unmodifiable type-specific function backed by the given type-specific function.- Parameters:
f
- the function to be wrapped in an unmodifiable function.- Returns:
- an unmodifiable view of the specified function.
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primitive
Returns a (partial) type-specific function based on the given total generic function.The returned function contains all keys which are not mapped to
null
. If the function already is a primitive function, it is returned without changes.Warning: If the given function is a “widened” primitive function (e.g. an
Int2IntFunction
given toShort2ShortFunctions
), it still is wrapped into a proxy, decreasing performance.- Parameters:
f
- the function to be converted to a type-specific function.- Returns:
- a primitive view of the specified function.
- Throws:
NullPointerException
- iff
is null.- Since:
- 8.1.0
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