Package it.unimi.dsi.fastutil.longs

Class Long2LongMaps.EmptyMap

java.lang.Object

it.unimi.dsi.fastutil.longs.AbstractLong2LongFunction

it.unimi.dsi.fastutil.longs.Long2LongFunctions.EmptyFunction

it.unimi.dsi.fastutil.longs.Long2LongMaps.EmptyMap

All Implemented Interfaces:

Function<Long,Long>, Long2LongFunction, Long2LongMap, Serializable, Cloneable, Function<Long,Long>, LongUnaryOperator, Map<Long,Long>

Direct Known Subclasses:

Long2LongSortedMaps.EmptySortedMap

Enclosing class:

Long2LongMaps

public static class Long2LongMaps.EmptyMap
extends Long2LongFunctions.EmptyFunction
implements Long2LongMap, 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.longs.Long2LongMap

Long2LongMap.Entry, Long2LongMap.FastEntrySet

Method Summary

Modifier and Type	Method	Description
Object	clone()
boolean	containsValue(long v)	Returns true if this map maps one or more keys to the specified value.
boolean	containsValue(Object ov)	Deprecated. Please use the corresponding type-specific method instead.
boolean	equals(Object o)
int	hashCode()
boolean	isEmpty()
LongSet	keySet()
ObjectSet<Long2LongMap.Entry>	long2LongEntrySet()	Returns a type-specific set view of the mappings contained in this map.
void	putAll(Map<? extends Long,? extends Long> m)
String	toString()
LongCollection	values()

Methods inherited from class it.unimi.dsi.fastutil.longs.Long2LongFunctions.EmptyFunction

clear, containsKey, defaultReturnValue, defaultReturnValue, get, size

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

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

apply

Methods inherited from interface java.util.function.Function

andThen, compose

Methods inherited from interface it.unimi.dsi.fastutil.longs.Long2LongFunction

applyAsLong, get, put, remove

Methods inherited from interface it.unimi.dsi.fastutil.longs.Long2LongMap

clear, compute, compute, computeIfAbsent, computeIfAbsent, computeIfAbsentNullable, computeIfAbsentPartial, computeIfPresent, computeIfPresent, containsKey, containsKey, defaultReturnValue, defaultReturnValue, entrySet, get, getOrDefault, getOrDefault, merge, merge, put, putIfAbsent, putIfAbsent, remove, remove, remove, replace, replace, replace, replace, size

Methods inherited from interface java.util.function.LongUnaryOperator

andThen, compose

Methods inherited from interface java.util.Map

forEach, replaceAll

Method Detail

containsValue

public boolean containsValue(long v)

Description copied from interface: Long2LongMap

Returns true if this map maps one or more keys to the specified value.

Specified by:

containsValue in interface Long2LongMap

See Also:

Map.containsValue(Object)

containsValue

@Deprecated
public boolean containsValue(Object ov)

Deprecated.

Please use the corresponding type-specific method instead.

Specified by:

containsValue in interface Long2LongMap

Specified by:

containsValue in interface Map<Long,Long>

putAll

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

Specified by:

putAll in interface Map<Long,Long>

long2LongEntrySet

public ObjectSet<Long2LongMap.Entry> long2LongEntrySet()

Description copied from interface: Long2LongMap

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:

long2LongEntrySet in interface Long2LongMap

Returns:

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

See Also:

Map.entrySet()

keySet

public LongSet keySet()

Description copied from interface: Long2LongMap

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

Specified by:

keySet in interface Long2LongMap

Specified by:

keySet in interface Map<Long,Long>

Returns:

a set view of the keys contained in this map.

See Also:

Map.keySet()

values

public LongCollection values()

Description copied from interface: Long2LongMap

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

Specified by:

values in interface Long2LongMap

Specified by:

values in interface Map<Long,Long>

Returns:

a set view of the values contained in this map.

See Also:

Map.values()

clone

public Object clone()

Overrides:

clone in class Long2LongFunctions.EmptyFunction

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface Map<Long,Long>

hashCode

public int hashCode()

Specified by:

hashCode in interface Map<Long,Long>

Overrides:

hashCode in class Long2LongFunctions.EmptyFunction

equals

public boolean equals(Object o)

Specified by:

equals in interface Map<Long,Long>

Overrides:

equals in class Long2LongFunctions.EmptyFunction

toString

public String toString()

Overrides:

toString in class Long2LongFunctions.EmptyFunction