it.unimi.dsi.fastutil.objects

Class Reference2ObjectMaps.Singleton<K,V>

java.lang.Object

it.unimi.dsi.fastutil.objects.AbstractReference2ObjectFunction<K,V>

it.unimi.dsi.fastutil.objects.Reference2ObjectFunctions.Singleton<K,V>

it.unimi.dsi.fastutil.objects.Reference2ObjectMaps.Singleton<K,V>

All Implemented Interfaces:

it.unimi.dsi.fastutil.objects.Reference2ObjectFunction<K,V>, Reference2ObjectMap<K,V>, java.io.Serializable, java.lang.Cloneable, java.util.function.Function<K,V>, java.util.Map<K,V>

Direct Known Subclasses:

Reference2ObjectSortedMaps.Singleton

Enclosing class:

Reference2ObjectMaps

public static class Reference2ObjectMaps.Singleton<K,V>
extends Reference2ObjectFunctions.Singleton<K,V>
implements Reference2ObjectMap<K,V>, java.io.Serializable, java.lang.Cloneable

An immutable class representing a type-specific singleton 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.Reference2ObjectMap

Reference2ObjectMap.Entry<K,V>, Reference2ObjectMap.FastEntrySet<K,V>

Field Summary

Fields

Modifier and Type	Field and Description
protected it.unimi.dsi.fastutil.objects.ObjectSet<Reference2ObjectMap.Entry<K,V>>	entries
protected it.unimi.dsi.fastutil.objects.ReferenceSet<K>	keys
protected it.unimi.dsi.fastutil.objects.ObjectCollection<V>	values

Fields inherited from class it.unimi.dsi.fastutil.objects.Reference2ObjectFunctions.Singleton

key, value

Fields inherited from class it.unimi.dsi.fastutil.objects.AbstractReference2ObjectFunction

defRetValue

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	Singleton(K key, V value)

Method Summary

Modifier and Type	Method and Description
boolean	containsValue(java.lang.Object v)
it.unimi.dsi.fastutil.objects.ObjectSet<java.util.Map.Entry<K,V>>	entrySet() Returns a set view of the mappings contained in this map.
boolean	equals(java.lang.Object o)
int	hashCode()
boolean	isEmpty()
it.unimi.dsi.fastutil.objects.ReferenceSet<K>	keySet()
void	putAll(java.util.Map<? extends K,? extends V> m)
it.unimi.dsi.fastutil.objects.ObjectSet<Reference2ObjectMap.Entry<K,V>>	reference2ObjectEntrySet() Returns a type-specific set view of the mappings contained in this map.
java.lang.String	toString()
it.unimi.dsi.fastutil.objects.ObjectCollection<V>	values()

Methods inherited from class it.unimi.dsi.fastutil.objects.Reference2ObjectFunctions.Singleton

clone, containsKey, get, getOrDefault, size

Methods inherited from class it.unimi.dsi.fastutil.objects.AbstractReference2ObjectFunction

defaultReturnValue, defaultReturnValue

Methods inherited from class java.lang.Object

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

Methods inherited from interface it.unimi.dsi.fastutil.objects.Reference2ObjectMap

clear, compute, computeIfAbsent, computeIfPresent, computeObjectIfAbsentPartial, containsKey, defaultReturnValue, defaultReturnValue, forEach, getOrDefault, merge, put, putIfAbsent, remove, remove, replace, replace, size

Methods inherited from interface it.unimi.dsi.fastutil.objects.Reference2ObjectFunction

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.Function

apply

Methods inherited from interface java.util.function.Function

andThen, compose, identity

Methods inherited from interface java.util.Map

computeIfAbsent, get, replaceAll

Field Detail

entries

protected transient it.unimi.dsi.fastutil.objects.ObjectSet<Reference2ObjectMap.Entry<K,V>> entries

keys

protected transient it.unimi.dsi.fastutil.objects.ReferenceSet<K> keys

values

protected transient it.unimi.dsi.fastutil.objects.ObjectCollection<V> values

Constructor Detail

Singleton

protected Singleton(K key,
                    V value)

Method Detail

containsValue

public boolean containsValue(java.lang.Object v)

Specified by:

containsValue in interface java.util.Map<K,V>

putAll

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

Specified by:

putAll in interface java.util.Map<K,V>

reference2ObjectEntrySet

public it.unimi.dsi.fastutil.objects.ObjectSet<Reference2ObjectMap.Entry<K,V>> reference2ObjectEntrySet()

Description copied from interface: Reference2ObjectMap

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:

reference2ObjectEntrySet in interface Reference2ObjectMap<K,V>

Returns:

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

See Also:

Map.entrySet()

entrySet

public it.unimi.dsi.fastutil.objects.ObjectSet<java.util.Map.Entry<K,V>> entrySet()

Returns a set view of the mappings contained in this map.

Specified by:

entrySet in interface Reference2ObjectMap<K,V>

Specified by:

entrySet in interface java.util.Map<K,V>

Returns:

a set view of the mappings contained in this map.

See Also:

Map.entrySet()

keySet

public it.unimi.dsi.fastutil.objects.ReferenceSet<K> keySet()

Description copied from interface: Reference2ObjectMap

Specified by:

keySet in interface Reference2ObjectMap<K,V>

Specified by:

keySet in interface java.util.Map<K,V>

Returns:

a set view of the keys contained in this map.

See Also:

Map.keySet()

values

public it.unimi.dsi.fastutil.objects.ObjectCollection<V> values()

Description copied from interface: Reference2ObjectMap

Specified by:

values in interface Reference2ObjectMap<K,V>

Specified by:

values in interface java.util.Map<K,V>

Returns:

a set view of the values contained in this map.

See Also:

Map.values()

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface java.util.Map<K,V>

hashCode

public int hashCode()

Specified by:

hashCode in interface java.util.Map<K,V>

Overrides:

hashCode in class java.lang.Object

equals

public boolean equals(java.lang.Object o)

Specified by:

equals in interface java.util.Map<K,V>

Overrides:

equals in class java.lang.Object

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object