it.unimi.dsi.fastutil.objects

Interface Reference2IntMap<K>

All Superinterfaces:

java.util.function.Function<K,java.lang.Integer>, java.util.Map<K,java.lang.Integer>, it.unimi.dsi.fastutil.objects.Reference2IntFunction<K>, java.util.function.ToIntFunction<K>

All Known Subinterfaces:

Reference2IntSortedMap<K>

All Known Implementing Classes:

AbstractReference2IntMap, AbstractReference2IntSortedMap, Reference2IntArrayMap, Reference2IntLinkedOpenHashMap, Reference2IntMaps.EmptyMap, Reference2IntMaps.Singleton, Reference2IntMaps.SynchronizedMap, Reference2IntMaps.UnmodifiableMap, Reference2IntOpenCustomHashMap, Reference2IntOpenHashMap, Reference2IntSortedMaps.EmptySortedMap, Reference2IntSortedMaps.Singleton, Reference2IntSortedMaps.SynchronizedSortedMap, Reference2IntSortedMaps.UnmodifiableSortedMap

public interface Reference2IntMap<K>
extends it.unimi.dsi.fastutil.objects.Reference2IntFunction<K>, java.util.Map<K,java.lang.Integer>

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 Reference2IntMap.FastEntrySet support also fast iteration.

This interface specifies reference equality semantics (members will be compared equal with == instead of equals) for its keys or values (or both), which may result in breaks in contract if attempted to be used with non reference-equality semantics based Maps. For example, a aReferenceToIntMap.equals(aObjectToIntMap) may return different a different result then aObjectToIntMap.equals(aReferenceToIntMap), in violation of equals's contract requiring it being symmetric.

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 and Description
static interface	Reference2IntMap.Entry<K> A type-specific Map.Entry; provides some additional methods that use polymorphism to avoid (un)boxing.
static interface	Reference2IntMap.FastEntrySet<K> An entry set providing fast iteration.

Method Summary

Modifier and Type	Method and Description
default void	clear() Removes all of the mappings from this map (optional operation).
default int	computeIfAbsent(K key, it.unimi.dsi.fastutil.objects.Reference2IntFunction<? super K> mappingFunction) If the specified key is not already associated with a value, attempts to compute its value using the given mapping function and enters it into this map, unless the key is not present in the given mapping function.
default int	computeIfAbsent(K key, java.util.function.ToIntFunction<? super K> mappingFunction) If the specified key is not already associated with a value, attempts to compute its value using the given mapping function and enters it into this map.
default int	computeInt(K key, java.util.function.BiFunction<? super K,? super java.lang.Integer,? extends java.lang.Integer> remappingFunction) Attempts to compute a mapping for the specified key and its current mapped value (or null if there is no current mapping).
default int	computeIntIfAbsent(K key, java.util.function.ToIntFunction<? super K> mappingFunction) Deprecated. Please use computeIfAbsent() instead.
default int	computeIntIfAbsentPartial(K key, it.unimi.dsi.fastutil.objects.Reference2IntFunction<? super K> mappingFunction) Deprecated. Please use computeIfAbsent() instead.
default int	computeIntIfPresent(K key, java.util.function.BiFunction<? super K,? super java.lang.Integer,? extends java.lang.Integer> remappingFunction) If the value for the specified key is present, attempts to compute a new mapping given the key and its current mapped value.
boolean	containsKey(java.lang.Object key) Returns true if this function contains a mapping for the specified key.
boolean	containsValue(int value) Returns true if this map maps one or more keys to the specified value.
default boolean	containsValue(java.lang.Object value) Deprecated. Please use the corresponding type-specific method instead.
int	defaultReturnValue() Gets the default return value.
void	defaultReturnValue(int rv) Sets the default return value (optional operation).
default it.unimi.dsi.fastutil.objects.ObjectSet<java.util.Map.Entry<K,java.lang.Integer>>	entrySet() Deprecated. Please use the corresponding type-specific method instead.
default void	forEach(java.util.function.BiConsumer<? super K,? super java.lang.Integer> consumer)
default java.lang.Integer	get(java.lang.Object key) Deprecated. Please use the corresponding type-specific method instead.
default int	getOrDefault(java.lang.Object key, int defaultValue) Returns the value to which the specified key is mapped, or the defaultValue if this map contains no mapping for the key.
default java.lang.Integer	getOrDefault(java.lang.Object key, java.lang.Integer defaultValue) Deprecated. Please use the corresponding type-specific method instead.
it.unimi.dsi.fastutil.objects.ReferenceSet<K>	keySet()
default int	merge(K key, int value, java.util.function.BiFunction<? super java.lang.Integer,? super java.lang.Integer,? extends java.lang.Integer> remappingFunction) If the specified key is not already associated with a value, associates it with the given value.
default java.lang.Integer	merge(K key, java.lang.Integer value, java.util.function.BiFunction<? super java.lang.Integer,? super java.lang.Integer,? extends java.lang.Integer> remappingFunction) Deprecated. Please use the corresponding type-specific method instead.
default int	mergeInt(K key, int value, java.util.function.BiFunction<? super java.lang.Integer,? super java.lang.Integer,? extends java.lang.Integer> remappingFunction) Deprecated. Please use merge() instead.
default int	mergeInt(K key, int value, java.util.function.IntBinaryOperator remappingFunction) If the specified key is not already associated with a value, associates it with the given value.
default int	mergeInt(K key, int value, it.unimi.dsi.fastutil.ints.IntBinaryOperator remappingFunction) If the specified key is not already associated with a value, associates it with the given value.
default java.lang.Integer	put(K key, java.lang.Integer value) Deprecated. Please use the corresponding type-specific method instead.
default int	putIfAbsent(K key, int value) If the specified key is not already associated with a value, associates it with the given value and returns the default return value, else returns the current value.
default java.lang.Integer	putIfAbsent(K key, java.lang.Integer value) Deprecated. Please use the corresponding type-specific method instead.
it.unimi.dsi.fastutil.objects.ObjectSet<Reference2IntMap.Entry<K>>	reference2IntEntrySet() Returns a type-specific set view of the mappings contained in this map.
default java.lang.Integer	remove(java.lang.Object key) Deprecated. Please use the corresponding type-specific method instead.
default boolean	remove(java.lang.Object key, int value) Removes the entry for the specified key only if it is currently mapped to the specified value.
default boolean	remove(java.lang.Object key, java.lang.Object value) Deprecated. Please use the corresponding type-specific method instead.
default int	replace(K key, int value) Replaces the entry for the specified key only if it is currently mapped to some value.
default java.lang.Integer	replace(K key, java.lang.Integer value) Deprecated. Please use the corresponding type-specific method instead.
default boolean	replace(K key, java.lang.Integer oldValue, java.lang.Integer newValue) Deprecated. Please use the corresponding type-specific method instead.
default boolean	replace(K key, int oldValue, int newValue) Replaces the entry for the specified key only if currently mapped to the specified value.
int	size() Returns the number of key/value mappings in this map.
it.unimi.dsi.fastutil.ints.IntCollection	values()

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.Function

apply

Methods inherited from interface java.util.function.Function

compose, identity

Methods inherited from interface java.util.Map

compute, computeIfAbsent, computeIfPresent, equals, hashCode, isEmpty, putAll, replaceAll

Method Detail

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 java.util.Map<K,java.lang.Integer>

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 java.util.Map<K,java.lang.Integer>

Throws:

java.lang.UnsupportedOperationException - if the clear() operation is not supported by this map

defaultReturnValue

void defaultReturnValue(int 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 0/false by default.

Specified by:

defaultReturnValue in interface it.unimi.dsi.fastutil.objects.Reference2IntFunction<K>

Parameters:

rv - the new default return value.

See Also:

defaultReturnValue()

defaultReturnValue

int defaultReturnValue()

Gets the default return value.

Specified by:

defaultReturnValue in interface it.unimi.dsi.fastutil.objects.Reference2IntFunction<K>

Returns:

the current default return value.

reference2IntEntrySet

it.unimi.dsi.fastutil.objects.ObjectSet<Reference2IntMap.Entry<K>> reference2IntEntrySet()

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

@Deprecated
default it.unimi.dsi.fastutil.objects.ObjectSet<java.util.Map.Entry<K,java.lang.Integer>> entrySet()

Deprecated. Please use the corresponding type-specific method instead.

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

Specified by:

entrySet in interface java.util.Map<K,java.lang.Integer>

Returns:

a set view of the mappings contained in this map.

See Also:

Map.entrySet()

put

@Deprecated
default java.lang.Integer put(K key,
                                          java.lang.Integer value)

Deprecated. Please use the corresponding type-specific method instead.

This default implementation just delegates to the corresponding type-specific–function method.

Specified by:

put in interface java.util.Map<K,java.lang.Integer>

Specified by:

put in interface it.unimi.dsi.fastutil.objects.Reference2IntFunction<K>

get

@Deprecated
default java.lang.Integer get(java.lang.Object key)

Deprecated. Please use the corresponding type-specific method instead.

This default implementation just delegates to the corresponding type-specific–function method.

Specified by:

get in interface java.util.Map<K,java.lang.Integer>

Specified by:

get in interface it.unimi.dsi.fastutil.objects.Reference2IntFunction<K>

remove

@Deprecated
default java.lang.Integer remove(java.lang.Object key)

Deprecated. Please use the corresponding type-specific method instead.

This default implementation just delegates to the corresponding type-specific–function method.

Specified by:

remove in interface java.util.Map<K,java.lang.Integer>

Specified by:

remove in interface it.unimi.dsi.fastutil.objects.Reference2IntFunction<K>

keySet

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

Specified by:

keySet in interface java.util.Map<K,java.lang.Integer>

Returns:

a set view of the keys contained in this map.

See Also:

Map.keySet()

values

it.unimi.dsi.fastutil.ints.IntCollection values()

Specified by:

values in interface java.util.Map<K,java.lang.Integer>

Returns:

a set view of the values contained in this map.

See Also:

Map.values()

containsKey

boolean containsKey(java.lang.Object key)

Returns true if this function contains a mapping for the specified key.

Specified by:

containsKey in interface java.util.Map<K,java.lang.Integer>

Parameters:

key - the key.

Returns:

true if this function associates a value to key.

See Also:

Map.containsKey(Object)

containsValue

boolean containsValue(int value)

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

See Also:

Map.containsValue(Object)

containsValue

@Deprecated
default boolean containsValue(java.lang.Object value)

Deprecated. Please use the corresponding type-specific method instead.

Specified by:

containsValue in interface java.util.Map<K,java.lang.Integer>

forEach

default void forEach(java.util.function.BiConsumer<? super K,? super java.lang.Integer> consumer)

Specified by:

forEach in interface java.util.Map<K,java.lang.Integer>

getOrDefault

default int getOrDefault(java.lang.Object key,
                         int defaultValue)

Returns the value to which the specified key is mapped, or the defaultValue if this map contains no mapping for the key.

Specified by:

getOrDefault in interface it.unimi.dsi.fastutil.objects.Reference2IntFunction<K>

Parameters:

key - the key.

defaultValue - the default mapping of the key.

Returns:

the value to which the specified key is mapped, or the defaultValue if this map contains no mapping for the key.

Since:

8.0.0

See Also:

Map.getOrDefault(Object, Object)

getOrDefault

@Deprecated
default java.lang.Integer getOrDefault(java.lang.Object key,
                                                   java.lang.Integer defaultValue)

Deprecated. Please use the corresponding type-specific method instead.

This default implementation just delegates to the corresponding Map method.

Specified by:

getOrDefault in interface java.util.Map<K,java.lang.Integer>

Specified by:

getOrDefault in interface it.unimi.dsi.fastutil.objects.Reference2IntFunction<K>

putIfAbsent

default int putIfAbsent(K key,
                        int value)

If the specified key is not already associated with a value, associates it with the given value and returns the default return value, else returns the current value.

Parameters:

key - key with which the specified value is to be associated.

value - value to be associated with the specified key.

Returns:

the previous value associated with the specified key, or the default return value if there was no mapping for the key.

Since:

8.0.0

See Also:

Map.putIfAbsent(Object, Object)

remove

default boolean remove(java.lang.Object key,
                       int value)

Removes the entry for the specified key only if it is currently mapped to the specified value.

Parameters:

key - key with which the specified value is associated.

value - value expected to be associated with the specified key.

Returns:

true if the value was removed.

Since:

8.0.0

See Also:

Map.remove(Object, Object)

replace

default boolean replace(K key,
                        int oldValue,
                        int newValue)

Replaces the entry for the specified key only if currently mapped to the specified value.

Parameters:

key - key with which the specified value is associated.

oldValue - value expected to be associated with the specified key.

newValue - value to be associated with the specified key.

Returns:

true if the value was replaced.

Since:

8.0.0

See Also:

Map.replace(Object, Object, Object)

replace

default int replace(K key,
                    int value)

Replaces the entry for the specified key only if it is currently mapped to some value.

Parameters:

key - key with which the specified value is associated.

value - value to be associated with the specified key.

Returns:

the previous value associated with the specified key, or the default return value if there was no mapping for the key.

Since:

8.0.0

See Also:

Map.replace(Object, Object)

computeIfAbsent

default int computeIfAbsent(K key,
                            java.util.function.ToIntFunction<? super K> mappingFunction)

If the specified key is not already associated with a value, attempts to compute its value using the given mapping function and enters it into this map.

Note that contrarily to the default computeIfAbsent(), it is not possible to not add a value for a given key, since the mappingFunction cannot return null. If such a behavior is needed, please use the corresponding nullable version.

Parameters:

key - key with which the specified value is to be associated.

mappingFunction - the function to compute a value.

Returns:

the current (existing or computed) value associated with the specified key.

Since:

8.0.0

See Also:

Map.computeIfAbsent(Object, java.util.function.Function)

computeIntIfAbsent

@Deprecated
default int computeIntIfAbsent(K key,
                                           java.util.function.ToIntFunction<? super K> mappingFunction)

Deprecated. Please use computeIfAbsent() instead.

computeIfAbsent

default int computeIfAbsent(K key,
                            it.unimi.dsi.fastutil.objects.Reference2IntFunction<? super K> mappingFunction)

If the specified key is not already associated with a value, attempts to compute its value using the given mapping function and enters it into this map, unless the key is not present in the given mapping function.

This version of computeIfAbsent() uses a type-specific version of fastutil's Function. Since Function has a containsKey() method, it is possible to avoid adding a key by having containsKey() return false for that key.

Parameters:

key - key with which the specified value is to be associated.

mappingFunction - the function to compute a value.

Returns:

the current (existing or computed) value associated with the specified key.

Since:

8.0.0

See Also:

Map.computeIfAbsent(Object, java.util.function.Function)

computeIntIfAbsentPartial

@Deprecated
default int computeIntIfAbsentPartial(K key,
                                                  it.unimi.dsi.fastutil.objects.Reference2IntFunction<? super K> mappingFunction)

Deprecated. Please use computeIfAbsent() instead.

computeIntIfPresent

default int computeIntIfPresent(K key,
                                java.util.function.BiFunction<? super K,? super java.lang.Integer,? extends java.lang.Integer> remappingFunction)

If the value for the specified key is present, attempts to compute a new mapping given the key and its current mapped value.

Parameters:

key - key with which the specified value is to be associated.

remappingFunction - the function to compute a value.

Returns:

the new value associated with the specified key, or the default return value if none.

Since:

8.0.0

See Also:

Map.computeIfPresent(Object, java.util.function.BiFunction)

computeInt

default int computeInt(K key,
                       java.util.function.BiFunction<? super K,? super java.lang.Integer,? extends java.lang.Integer> remappingFunction)

Attempts to compute a mapping for the specified key and its current mapped value (or null if there is no current mapping).

If the function returns null, the mapping is removed (or remains absent if initially absent). If the function itself throws an (unchecked) exception, the exception is rethrown, and the current mapping is left unchanged.

Parameters:

key - key with which the specified value is to be associated.

remappingFunction - the function to compute a value.

Returns:

the new value associated with the specified key, or the default return value if none.

Since:

8.0.0

See Also:

Map.compute(Object, java.util.function.BiFunction)

merge

default int merge(K key,
                  int value,
                  java.util.function.BiFunction<? super java.lang.Integer,? super java.lang.Integer,? extends java.lang.Integer> remappingFunction)

If the specified key is not already associated with a value, associates it with the given value. Otherwise, replaces the associated value with the results of the given remapping function, or removes if the result is null.

Parameters:

key - key with which the resulting value is to be associated.

value - the value to be merged with the existing value associated with the key or, if no existing value is associated with the key, to be associated with the key.

remappingFunction - the function to recompute a value if present.

Returns:

the new value associated with the specified key, or the default return value if no value is associated with the key.

Since:

8.0.0

See Also:

Map.merge(Object, Object, java.util.function.BiFunction)

mergeInt

default int mergeInt(K key,
                     int value,
                     java.util.function.IntBinaryOperator remappingFunction)

If the specified key is not already associated with a value, associates it with the given value. Otherwise, replaces the associated value with the results of the given remapping function.

Parameters:

key - key with which the resulting value is to be associated.

value - the value to be merged with the existing value associated with the key or, if no existing value is associated with the key, to be associated with the key.

remappingFunction - the function to recompute a value if present.

Returns:

the new value associated with the specified key.

Since:

8.5.0

See Also:

Map.merge(Object, Object, java.util.function.BiFunction)

mergeInt

default int mergeInt(K key,
                     int value,
                     it.unimi.dsi.fastutil.ints.IntBinaryOperator remappingFunction)

If the specified key is not already associated with a value, associates it with the given value. Otherwise, replaces the associated value with the results of the given remapping function.

Parameters:

key - key with which the resulting value is to be associated.

value - the value to be merged with the existing value associated with the key or, if no existing value is associated with the key, to be associated with the key.

remappingFunction - the function to recompute a value if present.

Since:

8.5.1

See Also:

Map.merge(Object, Object, java.util.function.BiFunction)

mergeInt

@Deprecated
default int mergeInt(K key,
                                 int value,
                                 java.util.function.BiFunction<? super java.lang.Integer,? super java.lang.Integer,? extends java.lang.Integer> remappingFunction)

Deprecated. Please use merge() instead.

putIfAbsent

@Deprecated
default java.lang.Integer putIfAbsent(K key,
                                                  java.lang.Integer value)

Deprecated. Please use the corresponding type-specific method instead.

This default implementation just delegates to the corresponding Map method.

Specified by:

putIfAbsent in interface java.util.Map<K,java.lang.Integer>

remove

@Deprecated
default boolean remove(java.lang.Object key,
                                   java.lang.Object value)

Deprecated. Please use the corresponding type-specific method instead.

This default implementation just delegates to the corresponding Map method.

Specified by:

remove in interface java.util.Map<K,java.lang.Integer>

replace

@Deprecated
default boolean replace(K key,
                                    java.lang.Integer oldValue,
                                    java.lang.Integer newValue)

Deprecated. Please use the corresponding type-specific method instead.

This default implementation just delegates to the corresponding Map method.

Specified by:

replace in interface java.util.Map<K,java.lang.Integer>

replace

@Deprecated
default java.lang.Integer replace(K key,
                                              java.lang.Integer value)

Deprecated. Please use the corresponding type-specific method instead.

This default implementation just delegates to the corresponding Map method.

Specified by:

replace in interface java.util.Map<K,java.lang.Integer>

merge

@Deprecated
default java.lang.Integer merge(K key,
                                            java.lang.Integer value,
                                            java.util.function.BiFunction<? super java.lang.Integer,? super java.lang.Integer,? extends java.lang.Integer> remappingFunction)

Deprecated. Please use the corresponding type-specific method instead.

This default implementation just delegates to the corresponding Map method.

Specified by:

merge in interface java.util.Map<K,java.lang.Integer>