it.unimi.dsi.fastutil.objects

Class Reference2ReferenceMaps.EmptyMap<K,V>

java.lang.Object

it.unimi.dsi.fastutil.objects.AbstractReference2ReferenceFunction<K,V>

it.unimi.dsi.fastutil.objects.Reference2ReferenceFunctions.EmptyFunction<K,V>

it.unimi.dsi.fastutil.objects.Reference2ReferenceMaps.EmptyMap<K,V>

All Implemented Interfaces:

Reference2ReferenceFunction<K,V>, Reference2ReferenceMap<K,V>, Serializable, Cloneable, Function<K,V>, Map<K,V>

Direct Known Subclasses:

Reference2ReferenceSortedMaps.EmptySortedMap

Enclosing class:

Reference2ReferenceMaps

public static class Reference2ReferenceMaps.EmptyMap<K,V>
extends Reference2ReferenceFunctions.EmptyFunction<K,V>
implements Reference2ReferenceMap<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

Nested Class Summary

Nested classes/interfaces inherited from interface it.unimi.dsi.fastutil.objects.Reference2ReferenceMap

Reference2ReferenceMap.Entry<K,V>, Reference2ReferenceMap.FastEntrySet<K,V>

Field Summary

Fields inherited from class it.unimi.dsi.fastutil.objects.AbstractReference2ReferenceFunction

defRetValue

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	EmptyMap()

Method Summary

Modifier and Type	Method and Description
Object	clone()
boolean	containsValue(Object v)
boolean	equals(Object o)
int	hashCode()
boolean	isEmpty()
ReferenceSet<K>	keySet()
void	putAll(Map<? extends K,? extends V> m)
ObjectSet<Reference2ReferenceMap.Entry<K,V>>	reference2ReferenceEntrySet() Returns a type-specific set view of the mappings contained in this map.
String	toString()
ReferenceCollection<V>	values()

Methods inherited from class it.unimi.dsi.fastutil.objects.Reference2ReferenceFunctions.EmptyFunction

clear, containsKey, defaultReturnValue, defaultReturnValue, get, size

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface it.unimi.dsi.fastutil.objects.Reference2ReferenceMap

clear, containsKey, defaultReturnValue, defaultReturnValue, entrySet, put, remove, size

Methods inherited from interface it.unimi.dsi.fastutil.objects.Reference2ReferenceFunction

get

Methods inherited from interface it.unimi.dsi.fastutil.Function

apply

Methods inherited from interface java.util.function.Function

andThen, compose, identity

Methods inherited from interface java.util.Map

compute, computeIfAbsent, computeIfPresent, forEach, get, getOrDefault, merge, putIfAbsent, remove, replace, replace, replaceAll

Constructor Detail

EmptyMap

protected EmptyMap()

Method Detail

containsValue

public boolean containsValue(Object v)

Specified by:

containsValue in interface Map<K,V>

putAll

public void putAll(Map<? extends K,? extends V> m)

Specified by:

putAll in interface Map<K,V>

reference2ReferenceEntrySet

public ObjectSet<Reference2ReferenceMap.Entry<K,V>> reference2ReferenceEntrySet()

Description copied from interface: Reference2ReferenceMap

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 an ObjectSet of type-specific entries (the latter makes it possible to access keys and values with type-specific methods).

Specified by:

reference2ReferenceEntrySet in interface Reference2ReferenceMap<K,V>

Returns:

a type-specific set view of the mappings contained in this map.

See Also:

Map.entrySet()

keySet

public ReferenceSet<K> keySet()

Description copied from interface: Reference2ReferenceMap

Note that this specification strengthens the one given in Map.keySet().

Specified by:

keySet in interface Reference2ReferenceMap<K,V>

Specified by:

keySet in interface Map<K,V>

Returns:

a set view of the keys contained in this map.

See Also:

Map.keySet()

values

public ReferenceCollection<V> values()

Description copied from interface: Reference2ReferenceMap

Note that this specification strengthens the one given in Map.values().

Specified by:

values in interface Reference2ReferenceMap<K,V>

Specified by:

values in interface Map<K,V>

Returns:

a set view of the values contained in this map.

See Also:

Map.values()

clone

public Object clone()

Overrides:

clone in class Reference2ReferenceFunctions.EmptyFunction<K,V>

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface Map<K,V>

hashCode

public int hashCode()

Specified by:

hashCode in interface Map<K,V>

Overrides:

hashCode in class Reference2ReferenceFunctions.EmptyFunction<K,V>

equals

public boolean equals(Object o)

Specified by:

equals in interface Map<K,V>

Overrides:

equals in class Reference2ReferenceFunctions.EmptyFunction<K,V>

toString

public String toString()

Overrides:

toString in class Reference2ReferenceFunctions.EmptyFunction<K,V>