Package it.unimi.dsi.fastutil.objects

Class Reference2IntMaps.EmptyMap<K>

java.lang.Object

it.unimi.dsi.fastutil.objects.AbstractReference2IntFunction<K>

it.unimi.dsi.fastutil.objects.Reference2IntFunctions.EmptyFunction<K>

it.unimi.dsi.fastutil.objects.Reference2IntMaps.EmptyMap<K>

All Implemented Interfaces:

Function<K,Integer>, Reference2IntFunction<K>, Reference2IntMap<K>, Serializable, Cloneable, Function<K,Integer>, ToIntFunction<K>, Map<K,Integer>

Direct Known Subclasses:

Reference2IntSortedMaps.EmptySortedMap

Enclosing class:

Reference2IntMaps

public static class Reference2IntMaps.EmptyMap<K>
extends Reference2IntFunctions.EmptyFunction<K>
implements Reference2IntMap<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.Reference2IntMap

Reference2IntMap.Entry<K>, Reference2IntMap.FastEntrySet<K>

Method Summary

Modifier and Type	Method	Description
Object	clone()
boolean	containsValue(int 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 Integer> consumer)
int	getOrDefault(Object key, int defaultValue)	Returns the value associated by this function to the specified key, or give the specified value if not present.
Integer	getOrDefault(Object key, Integer defaultValue)	Deprecated.
int	hashCode()
boolean	isEmpty()
ReferenceSet<K>	keySet()
void	putAll(Map<? extends K,? extends Integer> m)
ObjectSet<Reference2IntMap.Entry<K>>	reference2IntEntrySet()	Returns a type-specific set view of the mappings contained in this map.
String	toString()
IntCollection	values()

Methods inherited from class it.unimi.dsi.fastutil.objects.Reference2IntFunctions.EmptyFunction

clear, containsKey, defaultReturnValue, defaultReturnValue, getInt, 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.Reference2IntFunction

andThen, andThenByte, andThenChar, andThenDouble, andThenFloat, andThenInt, andThenLong, andThenObject, andThenReference, andThenShort, applyAsInt, composeByte, composeChar, composeDouble, composeFloat, composeInt, composeLong, composeObject, composeReference, composeShort, getInt, put, removeInt

Methods inherited from interface it.unimi.dsi.fastutil.objects.Reference2IntMap

clear, computeIfAbsent, computeIfAbsent, computeInt, computeIntIfAbsent, computeIntIfAbsentPartial, computeIntIfPresent, containsKey, defaultReturnValue, defaultReturnValue, entrySet, get, merge, merge, mergeInt, mergeInt, mergeInt, put, putIfAbsent, putIfAbsent, remove, remove, remove, replace, replace, replace, replace, size

Method Details

containsValue

public boolean containsValue(int v)

Description copied from interface: Reference2IntMap

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

Specified by:

containsValue in interface Reference2IntMap<K>

See Also:

• Map.containsValue(Object)

getOrDefault

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

Deprecated.

Description copied from interface: Reference2IntMap

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,Integer>

Specified by:

getOrDefault in interface Map<K,Integer>

Specified by:

getOrDefault in interface Reference2IntFunction<K>

Specified by:

getOrDefault in interface Reference2IntMap<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 int getOrDefault(Object key,
 int defaultValue)

Description copied from interface: Reference2IntFunction

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

Specified by:

getOrDefault in interface Reference2IntFunction<K>

Specified by:

getOrDefault in interface Reference2IntMap<K>

Overrides:

getOrDefault in class Reference2IntFunctions.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,Integer>

Specified by:

containsValue in interface Reference2IntMap<K>

putAll

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

Specified by:

putAll in interface Map<K,Integer>

reference2IntEntrySet

public ObjectSet<Reference2IntMap.Entry<K>> reference2IntEntrySet()

Description copied from interface: Reference2IntMap

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:

reference2IntEntrySet in interface Reference2IntMap<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: Reference2IntMap

Specified by:

keySet in interface Map<K,Integer>

Specified by:

keySet in interface Reference2IntMap<K>

Returns:

a set view of the keys contained in this map.

See Also:

• Map.keySet()

values

public IntCollection values()

Description copied from interface: Reference2IntMap

Specified by:

values in interface Map<K,Integer>

Specified by:

values in interface Reference2IntMap<K>

Returns:

a set view of the values contained in this map.

See Also:

• Map.values()

forEach

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

Specified by:

forEach in interface Map<K,Integer>

Specified by:

forEach in interface Reference2IntMap<K>

clone

public Object clone()

Overrides:

clone in class Reference2IntFunctions.EmptyFunction<K>

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface Map<K,Integer>

hashCode

public int hashCode()

Specified by:

hashCode in interface Map<K,Integer>

Overrides:

hashCode in class Reference2IntFunctions.EmptyFunction<K>

equals

public boolean equals(Object o)

Specified by:

equals in interface Map<K,Integer>

Overrides:

equals in class Reference2IntFunctions.EmptyFunction<K>

toString

public String toString()

Overrides:

toString in class Reference2IntFunctions.EmptyFunction<K>