All Superinterfaces:: Function<K,V>, Function<K,V>, Map<K,V>, Reference2ReferenceFunction<K,V>

All Known Subinterfaces:: Reference2ReferenceSortedMap<K,V>

All Known Implementing Classes:: AbstractReference2ReferenceMap, AbstractReference2ReferenceSortedMap, Reference2ReferenceArrayMap, Reference2ReferenceLinkedOpenHashMap, Reference2ReferenceMaps.EmptyMap, Reference2ReferenceMaps.Singleton, Reference2ReferenceMaps.SynchronizedMap, Reference2ReferenceMaps.UnmodifiableMap, Reference2ReferenceOpenCustomHashMap, Reference2ReferenceOpenHashMap, Reference2ReferenceSortedMaps.EmptySortedMap, Reference2ReferenceSortedMaps.Singleton, Reference2ReferenceSortedMaps.SynchronizedSortedMap, Reference2ReferenceSortedMaps.UnmodifiableSortedMap

public interface Reference2ReferenceMap<K,V>
extends Reference2ReferenceFunction<K,V>, Map<K,V>

A type-specific Map; provides some additional methods that use polymorphism to avoid (un)boxing, and handling of a default return value.

Besides extending the corresponding type-specific function, this interface strengthens Map.entrySet(), keySet() and values(). Moreover, a number of methods, such as size(), defaultReturnValue(), etc., are un-defaulted as their function default do not make sense for a map. Maps returning entry sets of type Reference2ReferenceMap.FastEntrySet support also fast iteration.

A submap or subset may or may not have an independent default return value (which however must be initialized to the default return value of the originator).

See Also:: Map

Nested Class Summary

Nested Classes
Modifier and Type	Interface	Description
`static interface`	`Reference2ReferenceMap.Entry<K,V>`	A type-specific `Map.Entry`; provides some additional methods that use polymorphism to avoid (un)boxing.
`static interface`	`Reference2ReferenceMap.FastEntrySet<K,V>`	An entry set providing fast iteration.

Method Summary

Modifier and Type	Method	Description
`default void`	`clear()`	Removes all of the mappings from this map (optional operation).
`boolean`	`containsKey(Object key)`	Returns true if this function contains a mapping for the specified key.
`V`	`defaultReturnValue()`	Gets the default return value.
`void`	`defaultReturnValue(V rv)`	Sets the default return value (optional operation).
`default ObjectSet<Map.Entry<K,V>>`	`entrySet()`	Returns a set view of the mappings contained in this map.
`ReferenceSet<K>`	`keySet()`
`default V`	`put(K key, V value)`	Adds a pair to the map (optional operation).
`ObjectSet<Reference2ReferenceMap.Entry<K,V>>`	`reference2ReferenceEntrySet()`	Returns a type-specific set view of the mappings contained in this map.
`default V`	`remove(Object key)`	Removes the mapping with the given key (optional operation).
`int`	`size()`	Returns the number of key/value mappings in this map.
`ReferenceCollection<V>`	`values()`

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

apply

Methods inherited from interface java.util.function.Function

andThen, compose

Methods inherited from interface java.util.Map

compute, computeIfAbsent, computeIfPresent, containsValue, equals, forEach, get, getOrDefault, hashCode, isEmpty, merge, putAll, putIfAbsent, remove, replace, replace, replaceAll

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

get

Method Details
- size
  
  int size()
  
  Returns the number of key/value mappings in this map. If the map contains more than Integer.MAX_VALUE elements, returns Integer.MAX_VALUE.
  
  Specified by:
  
  size in interface Function<K,V>
  
  Specified by:
  
  size in interface Map<K,V>
  
  Returns:
  
  the number of key-value mappings in this map.
  
  See Also:
  
  Size64
- clear
  
  default void clear()
  
  Removes all of the mappings from this map (optional operation). The map will be empty after this call returns.
  
  Specified by:
  
  clear in interface Function<K,V>
  
  Specified by:
  
  clear in interface Map<K,V>
  
  Throws:
  
  UnsupportedOperationException - if the clear() operation is not supported by this map
  
  See Also:
  
  Map.clear()
- defaultReturnValue
  
  void defaultReturnValue(V rv)
  
  Sets the default return value (optional operation). This value must be returned by type-specific versions of get(), put() and remove() to denote that the map does not contain the specified key. It must be null by default.
  Warning: Changing this to a non-null value can have unforeseen consequences. Especially, it breaks compatibility with the specifications of Java's Map interface. It has to be used with great care and thorough study of all method comments is recommended.
  
  Specified by:
  
  defaultReturnValue in interface Reference2ReferenceFunction<K,V>
  
  Parameters:
  
  rv - the new default return value.
  
  See Also:
  
  defaultReturnValue()
- defaultReturnValue
  
  V defaultReturnValue()
  
  Gets the default return value.
  
  Specified by:
  
  defaultReturnValue in interface Reference2ReferenceFunction<K,V>
  
  Returns:
  
  the current default return value.
- reference2ReferenceEntrySet
  
  ObjectSet<Reference2ReferenceMap.Entry<K,V>> reference2ReferenceEntrySet()
  
  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).
  
  Returns:
  
  a type-specific set view of the mappings contained in this map.
  
  See Also:
  
  Map.entrySet()
- entrySet
  
  default ObjectSet<Map.Entry<K,V>> entrySet()
  
  Returns a set view of the mappings contained in this map.
  Note that this specification strengthens the one given in Map.entrySet().
  
  Specified by:
  
  entrySet in interface Map<K,V>
  
  Returns:
  
  a set view of the mappings contained in this map.
  
  See Also:
  
  Map.entrySet()
- put
  
  default V put(K key, V value)
  
  Adds a pair to the map (optional operation).
  This default implementation just delegates to the corresponding function method.
  
  Specified by:
  
  put in interface Function<K,V>
  
  Specified by:
  
  put in interface Map<K,V>
  
  Specified by:
  
  put in interface Reference2ReferenceFunction<K,V>
  
  Parameters:
  
  key - the key.
  
  value - the value.
  
  Returns:
  
  the old value, or the default return value if no value was present for the given key.
  
  See Also:
  
  Function.put(Object,Object)
- remove
  
  default V remove(Object key)
  
  Removes the mapping with the given key (optional operation).
  This default implementation just delegates to the corresponding type-specific–function method.
  
  Specified by:
  
  remove in interface Function<K,V>
  
  Specified by:
  
  remove in interface Map<K,V>
  
  Specified by:
  
  remove in interface Reference2ReferenceFunction<K,V>
  
  Parameters:
  
  key - the key.
  
  Returns:
  
  the old value, or the default return value if no value was present for the given key.
  
  See Also:
  
  Function.remove(Object)
- keySet
  
  ReferenceSet<K> keySet()
  
  Note that this specification strengthens the one given in Map.keySet().
  
  Specified by:
  
  keySet in interface Map<K,V>
  
  Returns:
  
  a set view of the keys contained in this map.
  
  See Also:
  
  Map.keySet()
- values
  
  ReferenceCollection<V> values()
  
  Note that this specification strengthens the one given in Map.values().
  
  Specified by:
  
  values in interface Map<K,V>
  
  Returns:
  
  a set view of the values contained in this map.
  
  See Also:
  
  Map.values()
- containsKey
  
  boolean containsKey(Object key)
  
  Returns true if this function contains a mapping for the specified key.
  
  Specified by:
  
  containsKey in interface Function<K,V>
  
  Specified by:
  
  containsKey in interface Map<K,V>
  
  Parameters:
  
  key - the key.
  
  Returns:
  
  true if this function associates a value to key.
  
  See Also:
  
  Map.containsKey(Object)

Interface Reference2ReferenceMap<K,​V>