Package it.unimi.dsi.fastutil.objects
Class Object2ReferenceMaps.EmptyMap<K,V>
java.lang.Object
it.unimi.dsi.fastutil.objects.AbstractObject2ReferenceFunction<K,V>
it.unimi.dsi.fastutil.objects.Object2ReferenceFunctions.EmptyFunction<K,V>
it.unimi.dsi.fastutil.objects.Object2ReferenceMaps.EmptyMap<K,V>
- All Implemented Interfaces:
Function<K,
,V> Object2ReferenceFunction<K,
,V> Object2ReferenceMap<K,
,V> Serializable
,Cloneable
,Function<K,
,V> Map<K,
V>
- Direct Known Subclasses:
Object2ReferenceSortedMaps.EmptySortedMap
- Enclosing class:
Object2ReferenceMaps
public static class Object2ReferenceMaps.EmptyMap<K,V>
extends Object2ReferenceFunctions.EmptyFunction<K,V>
implements Object2ReferenceMap<K,V>, Serializable, Cloneable
An immutable class representing an empty type-specific map.
This class may be useful to implement your own in case you subclass a type-specific map.
- See Also:
-
Nested Class Summary
Nested classes/interfaces inherited from interface it.unimi.dsi.fastutil.objects.Object2ReferenceMap
Object2ReferenceMap.Entry<K,
V>, Object2ReferenceMap.FastEntrySet<K, V> -
Method Summary
Modifier and TypeMethodDescriptionclone()
boolean
boolean
void
forEach
(BiConsumer<? super K, ? super V> consumer) getOrDefault
(Object key, V defaultValue) Returns the value associated by this function to the specified key, or give the specified value if not present.int
hashCode()
boolean
isEmpty()
keySet()
Returns a type-specific set view of the mappings contained in this map.void
toString()
values()
Methods inherited from class it.unimi.dsi.fastutil.objects.Object2ReferenceFunctions.EmptyFunction
clear, containsKey, defaultReturnValue, defaultReturnValue, get, size
Methods inherited from interface java.util.Map
computeIfAbsent, get, replaceAll
Methods inherited from interface it.unimi.dsi.fastutil.objects.Object2ReferenceFunction
andThenByte, andThenChar, andThenDouble, andThenFloat, andThenInt, andThenLong, andThenObject, andThenReference, andThenShort, composeByte, composeChar, composeDouble, composeFloat, composeInt, composeLong, composeObject, composeReference, composeShort, get
Methods inherited from interface it.unimi.dsi.fastutil.objects.Object2ReferenceMap
clear, compute, computeIfAbsent, computeIfPresent, computeReferenceIfAbsentPartial, containsKey, defaultReturnValue, defaultReturnValue, entrySet, merge, put, putIfAbsent, remove, remove, replace, replace, size
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Method Details
-
containsValue
- Specified by:
containsValue
in interfaceMap<K,
V>
-
getOrDefault
Description copied from interface:Object2ReferenceFunction
Returns the value associated by this function to the specified key, or give the specified value if not present.- Specified by:
getOrDefault
in interfaceFunction<K,
V> - Specified by:
getOrDefault
in interfaceMap<K,
V> - Specified by:
getOrDefault
in interfaceObject2ReferenceFunction<K,
V> - Specified by:
getOrDefault
in interfaceObject2ReferenceMap<K,
V> - Overrides:
getOrDefault
in classObject2ReferenceFunctions.EmptyFunction<K,
V> - Parameters:
key
- the key.defaultValue
- the value to return if not present.- Returns:
- the corresponding value, or
defaultValue
if no value was present for the given key. - See Also:
-
putAll
-
object2ReferenceEntrySet
Description copied from interface:Object2ReferenceMap
Returns a type-specific set view of the mappings contained in this map.This method is necessary because there is no inheritance along type parameters: it is thus impossible to strengthen
Map.entrySet()
so that it returns anObjectSet
of type-specific entries (the latter makes it possible to access keys and values with type-specific methods).- Specified by:
object2ReferenceEntrySet
in interfaceObject2ReferenceMap<K,
V> - Returns:
- a type-specific set view of the mappings contained in this map.
- See Also:
-
keySet
Description copied from interface:Object2ReferenceMap
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values
Description copied from interface:Object2ReferenceMap
-
forEach
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clone
- Overrides:
clone
in classObject2ReferenceFunctions.EmptyFunction<K,
V>
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isEmpty
public boolean isEmpty() -
hashCode
public int hashCode() -
equals
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toString
- Overrides:
toString
in classObject2ReferenceFunctions.EmptyFunction<K,
V>
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