Package it.unimi.dsi.fastutil.objects

Class Reference2LongMaps.EmptyMap<K>

java.lang.Object

it.unimi.dsi.fastutil.objects.AbstractReference2LongFunction<K>

it.unimi.dsi.fastutil.objects.Reference2LongFunctions.EmptyFunction<K>

it.unimi.dsi.fastutil.objects.Reference2LongMaps.EmptyMap<K>

All Implemented Interfaces:

Function<K,Long>, Reference2LongFunction<K>, Reference2LongMap<K>, Serializable, Cloneable, Function<K,Long>, ToLongFunction<K>, Map<K,Long>

Direct Known Subclasses:

Reference2LongSortedMaps.EmptySortedMap

Enclosing class:

Reference2LongMaps

public static class Reference2LongMaps.EmptyMap<K>
extends Reference2LongFunctions.EmptyFunction<K>
implements Reference2LongMap<K>, 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.Reference2LongMap

Reference2LongMap.Entry<K>, Reference2LongMap.FastEntrySet<K>

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)
void	forEach(BiConsumer<? super K,? super Long> consumer)
long	getOrDefault(Object key, long defaultValue)	Returns the value associated by this function to the specified key, or give the specified value if not present.
Long	getOrDefault(Object key, Long defaultValue)	Deprecated.
int	hashCode()
boolean	isEmpty()
ReferenceSet<K>	keySet()
void	putAll(Map<? extends K,? extends Long> m)
ObjectSet<Reference2LongMap.Entry<K>>	reference2LongEntrySet()	Returns a type-specific set view of the mappings contained in this map.
String	toString()
LongCollection	values()

Methods inherited from class it.unimi.dsi.fastutil.objects.Reference2LongFunctions.EmptyFunction

clear, containsKey, defaultReturnValue, defaultReturnValue, getLong, 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

compose

Methods inherited from interface java.util.Map

compute, computeIfAbsent, computeIfPresent, replaceAll

Methods inherited from interface it.unimi.dsi.fastutil.objects.Reference2LongFunction

andThen, andThenByte, andThenChar, andThenDouble, andThenFloat, andThenInt, andThenLong, andThenObject, andThenReference, andThenShort, applyAsLong, composeByte, composeChar, composeDouble, composeFloat, composeInt, composeLong, composeObject, composeReference, composeShort, getLong, put, removeLong

Methods inherited from interface it.unimi.dsi.fastutil.objects.Reference2LongMap

clear, computeIfAbsent, computeIfAbsent, computeLong, computeLongIfAbsent, computeLongIfAbsentPartial, computeLongIfPresent, containsKey, defaultReturnValue, defaultReturnValue, entrySet, get, merge, merge, mergeLong, mergeLong, mergeLong, put, putIfAbsent, putIfAbsent, remove, remove, remove, replace, replace, replace, replace, size

Method Details

containsValue

public boolean containsValue(long v)

Description copied from interface: Reference2LongMap

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

Specified by:

containsValue in interface Reference2LongMap<K>

See Also:

• Map.containsValue(Object)

getOrDefault

@Deprecated
public Long getOrDefault(Object key,
 Long defaultValue)

Deprecated.

Description copied from interface: Reference2LongMap

Returns the value associated by this function to the specified key, or give the specified value if not present.

This default implementation just delegates to the corresponding Map method.

Specified by:

getOrDefault in interface Function<K,Long>

Specified by:

getOrDefault in interface Map<K,Long>

Specified by:

getOrDefault in interface Reference2LongFunction<K>

Specified by:

getOrDefault in interface Reference2LongMap<K>

Parameters:

key - the key.

defaultValue - the default value to return if not present.

Returns:

the corresponding value, or defaultValue if no value was present for the given key.

See Also:

• Map.getOrDefault(Object, Object)

getOrDefault

public long getOrDefault(Object key,
 long defaultValue)

Description copied from interface: Reference2LongFunction

Returns the value associated by this function to the specified key, or give the specified value if not present.

Specified by:

getOrDefault in interface Reference2LongFunction<K>

Specified by:

getOrDefault in interface Reference2LongMap<K>

Overrides:

getOrDefault in class Reference2LongFunctions.EmptyFunction<K>

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:

• Function.getOrDefault(Object, Object)

containsValue

@Deprecated
public boolean containsValue(Object ov)

Deprecated.

Please use the corresponding type-specific method instead.

Specified by:

containsValue in interface Map<K,Long>

Specified by:

containsValue in interface Reference2LongMap<K>

putAll

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

Specified by:

putAll in interface Map<K,Long>

reference2LongEntrySet

public ObjectSet<Reference2LongMap.Entry<K>> reference2LongEntrySet()

Description copied from interface: Reference2LongMap

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:

reference2LongEntrySet in interface Reference2LongMap<K>

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: Reference2LongMap

Specified by:

keySet in interface Map<K,Long>

Specified by:

keySet in interface Reference2LongMap<K>

Returns:

a set view of the keys contained in this map.

See Also:

• Map.keySet()

values

public LongCollection values()

Description copied from interface: Reference2LongMap

Specified by:

values in interface Map<K,Long>

Specified by:

values in interface Reference2LongMap<K>

Returns:

a set view of the values contained in this map.

See Also:

• Map.values()

forEach

public void forEach(BiConsumer<? super K,? super Long> consumer)

Specified by:

forEach in interface Map<K,Long>

Specified by:

forEach in interface Reference2LongMap<K>

clone

public Object clone()

Overrides:

clone in class Reference2LongFunctions.EmptyFunction<K>

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface Map<K,Long>

hashCode

public int hashCode()

Specified by:

hashCode in interface Map<K,Long>

Overrides:

hashCode in class Reference2LongFunctions.EmptyFunction<K>

equals

public boolean equals(Object o)

Specified by:

equals in interface Map<K,Long>

Overrides:

equals in class Reference2LongFunctions.EmptyFunction<K>

toString

public String toString()

Overrides:

toString in class Reference2LongFunctions.EmptyFunction<K>