Package it.unimi.dsi.fastutil.objects
Class Object2ObjectMaps.EmptyMap<K,V>
- java.lang.Object
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- it.unimi.dsi.fastutil.objects.AbstractObject2ObjectFunction<K,V>
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- it.unimi.dsi.fastutil.objects.Object2ObjectFunctions.EmptyFunction<K,V>
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- it.unimi.dsi.fastutil.objects.Object2ObjectMaps.EmptyMap<K,V>
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- All Implemented Interfaces:
Function<K,V>
,Object2ObjectFunction<K,V>
,Object2ObjectMap<K,V>
,Serializable
,Cloneable
,Function<K,V>
,Map<K,V>
- Direct Known Subclasses:
Object2ObjectSortedMaps.EmptySortedMap
- Enclosing class:
- Object2ObjectMaps
public static class Object2ObjectMaps.EmptyMap<K,V> extends Object2ObjectFunctions.EmptyFunction<K,V> implements Object2ObjectMap<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:
- Serialized Form
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Nested Class Summary
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Nested classes/interfaces inherited from interface it.unimi.dsi.fastutil.objects.Object2ObjectMap
Object2ObjectMap.Entry<K,V>, Object2ObjectMap.FastEntrySet<K,V>
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description Object
clone()
boolean
containsValue(Object v)
boolean
equals(Object o)
int
hashCode()
boolean
isEmpty()
ObjectSet<K>
keySet()
ObjectSet<Object2ObjectMap.Entry<K,V>>
object2ObjectEntrySet()
Returns a type-specific set view of the mappings contained in this map.void
putAll(Map<? extends K,? extends V> m)
String
toString()
ObjectCollection<V>
values()
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Methods inherited from class it.unimi.dsi.fastutil.objects.Object2ObjectFunctions.EmptyFunction
clear, containsKey, defaultReturnValue, defaultReturnValue, get, size
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Methods inherited from interface java.util.Map
compute, computeIfAbsent, computeIfPresent, forEach, get, getOrDefault, merge, putIfAbsent, remove, replace, replace, replaceAll
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Methods inherited from interface it.unimi.dsi.fastutil.objects.Object2ObjectFunction
get
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Methods inherited from interface it.unimi.dsi.fastutil.objects.Object2ObjectMap
clear, containsKey, defaultReturnValue, defaultReturnValue, entrySet, put, remove, size
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Method Detail
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containsValue
public boolean containsValue(Object v)
- Specified by:
containsValue
in interfaceMap<K,V>
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object2ObjectEntrySet
public ObjectSet<Object2ObjectMap.Entry<K,V>> object2ObjectEntrySet()
Description copied from interface:Object2ObjectMap
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:
object2ObjectEntrySet
in interfaceObject2ObjectMap<K,V>
- Returns:
- a type-specific set view of the mappings contained in this map.
- See Also:
Map.entrySet()
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keySet
public ObjectSet<K> keySet()
Description copied from interface:Object2ObjectMap
Note that this specification strengthens the one given in
Map.keySet()
.- Specified by:
keySet
in interfaceMap<K,V>
- Specified by:
keySet
in interfaceObject2ObjectMap<K,V>
- Returns:
- a set view of the keys contained in this map.
- See Also:
Map.keySet()
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values
public ObjectCollection<V> values()
Description copied from interface:Object2ObjectMap
Note that this specification strengthens the one given in
Map.values()
.- Specified by:
values
in interfaceMap<K,V>
- Specified by:
values
in interfaceObject2ObjectMap<K,V>
- Returns:
- a set view of the values contained in this map.
- See Also:
Map.values()
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clone
public Object clone()
- Overrides:
clone
in classObject2ObjectFunctions.EmptyFunction<K,V>
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hashCode
public int hashCode()
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equals
public boolean equals(Object o)
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toString
public String toString()
- Overrides:
toString
in classObject2ObjectFunctions.EmptyFunction<K,V>
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