it.unimi.dsi.fastutil.objects

Interface Reference2LongMap<K>

All Superinterfaces:

java.util.function.Function<K,java.lang.Long>, java.util.Map<K,java.lang.Long>, it.unimi.dsi.fastutil.objects.Reference2LongFunction<K>, java.util.function.ToLongFunction<K>

All Known Subinterfaces:

Reference2LongSortedMap<K>

All Known Implementing Classes:

AbstractReference2LongMap, AbstractReference2LongSortedMap, Reference2LongArrayMap, Reference2LongLinkedOpenHashMap, Reference2LongMaps.EmptyMap, Reference2LongMaps.Singleton, Reference2LongMaps.SynchronizedMap, Reference2LongMaps.UnmodifiableMap, Reference2LongOpenCustomHashMap, Reference2LongOpenHashMap, Reference2LongSortedMaps.EmptySortedMap, Reference2LongSortedMaps.Singleton, Reference2LongSortedMaps.SynchronizedSortedMap, Reference2LongSortedMaps.UnmodifiableSortedMap

public interface Reference2LongMap<K>
extends it.unimi.dsi.fastutil.objects.Reference2LongFunction<K>, java.util.Map<K,java.lang.Long>

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 Reference2LongMap.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	Reference2LongMap.Entry<K> A type-specific Map.Entry; provides some additional methods that use polymorphism to avoid (un)boxing.
static interface	Reference2LongMap.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 long	computeIfAbsent(K key, it.unimi.dsi.fastutil.objects.Reference2LongFunction<? 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 long	computeIfAbsent(K key, java.util.function.ToLongFunction<? 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 long	computeLong(K key, java.util.function.BiFunction<? super K,? super java.lang.Long,? extends java.lang.Long> remappingFunction) Attempts to compute a mapping for the specified key and its current mapped value (or null if there is no current mapping).
default long	computeLongIfAbsent(K key, java.util.function.ToLongFunction<? super K> mappingFunction) Deprecated. Please use computeIfAbsent() instead.
default long	computeLongIfAbsentPartial(K key, it.unimi.dsi.fastutil.objects.Reference2LongFunction<? super K> mappingFunction) Deprecated. Please use computeIfAbsent() instead.
default long	computeLongIfPresent(K key, java.util.function.BiFunction<? super K,? super java.lang.Long,? extends java.lang.Long> 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(long 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.
long	defaultReturnValue() Gets the default return value.
void	defaultReturnValue(long rv) Sets the default return value (optional operation).
default it.unimi.dsi.fastutil.objects.ObjectSet<java.util.Map.Entry<K,java.lang.Long>>	entrySet() Deprecated. Please use the corresponding type-specific method instead.
default void	forEach(java.util.function.BiConsumer<? super K,? super java.lang.Long> consumer)
default java.lang.Long	get(java.lang.Object key) Deprecated. Please use the corresponding type-specific method instead.
default long	getOrDefault(java.lang.Object key, long 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.Long	getOrDefault(java.lang.Object key, java.lang.Long defaultValue) Deprecated. Please use the corresponding type-specific method instead.
it.unimi.dsi.fastutil.objects.ReferenceSet<K>	keySet()
default long	merge(K key, long value, java.util.function.BiFunction<? super java.lang.Long,? super java.lang.Long,? extends java.lang.Long> remappingFunction) If the specified key is not already associated with a value, associates it with the given value.
default java.lang.Long	merge(K key, java.lang.Long value, java.util.function.BiFunction<? super java.lang.Long,? super java.lang.Long,? extends java.lang.Long> remappingFunction) Deprecated. Please use the corresponding type-specific method instead.
default long	mergeLong(K key, long value, java.util.function.BiFunction<? super java.lang.Long,? super java.lang.Long,? extends java.lang.Long> remappingFunction) Deprecated. Please use merge() instead.
default long	mergeLong(K key, long value, java.util.function.LongBinaryOperator remappingFunction) If the specified key is not already associated with a value, associates it with the given value.
default long	mergeLong(K key, long value, it.unimi.dsi.fastutil.longs.LongBinaryOperator remappingFunction) If the specified key is not already associated with a value, associates it with the given value.
default java.lang.Long	put(K key, java.lang.Long value) Deprecated. Please use the corresponding type-specific method instead.
default long	putIfAbsent(K key, long 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.Long	putIfAbsent(K key, java.lang.Long value) Deprecated. Please use the corresponding type-specific method instead.
it.unimi.dsi.fastutil.objects.ObjectSet<Reference2LongMap.Entry<K>>	reference2LongEntrySet() Returns a type-specific set view of the mappings contained in this map.
default java.lang.Long	remove(java.lang.Object key) Deprecated. Please use the corresponding type-specific method instead.
default boolean	remove(java.lang.Object key, long 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 long	replace(K key, long value) Replaces the entry for the specified key only if it is currently mapped to some value.
default java.lang.Long	replace(K key, java.lang.Long value) Deprecated. Please use the corresponding type-specific method instead.
default boolean	replace(K key, long oldValue, long newValue) Replaces the entry for the specified key only if currently mapped to the specified value.
default boolean	replace(K key, java.lang.Long oldValue, java.lang.Long newValue) Deprecated. Please use the corresponding type-specific method instead.
int	size() Returns the number of key/value mappings in this map.
it.unimi.dsi.fastutil.longs.LongCollection	values()

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.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.Long>

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.Long>

Throws:

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

defaultReturnValue

void defaultReturnValue(long 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.Reference2LongFunction<K>

Parameters:

rv - the new default return value.

See Also:

defaultReturnValue()

defaultReturnValue

long defaultReturnValue()

Gets the default return value.

Specified by:

defaultReturnValue in interface it.unimi.dsi.fastutil.objects.Reference2LongFunction<K>

Returns:

the current default return value.

reference2LongEntrySet

it.unimi.dsi.fastutil.objects.ObjectSet<Reference2LongMap.Entry<K>> reference2LongEntrySet()

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.Long>> 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.Long>

Returns:

a set view of the mappings contained in this map.

See Also:

Map.entrySet()

put

@Deprecated
default java.lang.Long put(K key,
                                       java.lang.Long 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.Long>

Specified by:

put in interface it.unimi.dsi.fastutil.objects.Reference2LongFunction<K>

get

@Deprecated
default java.lang.Long 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.Long>

Specified by:

get in interface it.unimi.dsi.fastutil.objects.Reference2LongFunction<K>

remove

@Deprecated
default java.lang.Long 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.Long>

Specified by:

remove in interface it.unimi.dsi.fastutil.objects.Reference2LongFunction<K>

keySet

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

Specified by:

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

Returns:

a set view of the keys contained in this map.

See Also:

Map.keySet()

values

it.unimi.dsi.fastutil.longs.LongCollection values()

Specified by:

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

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.Long>

Parameters:

key - the key.

Returns:

true if this function associates a value to key.

See Also:

Map.containsKey(Object)

containsValue

boolean containsValue(long 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.Long>

forEach

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

Specified by:

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

getOrDefault

default long getOrDefault(java.lang.Object key,
                          long 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.Reference2LongFunction<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.Long getOrDefault(java.lang.Object key,
                                                java.lang.Long 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.Long>

Specified by:

getOrDefault in interface it.unimi.dsi.fastutil.objects.Reference2LongFunction<K>

putIfAbsent

default long putIfAbsent(K key,
                         long 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,
                       long 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,
                        long oldValue,
                        long 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 long replace(K key,
                     long 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 long computeIfAbsent(K key,
                             java.util.function.ToLongFunction<? 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)

computeLongIfAbsent

@Deprecated
default long computeLongIfAbsent(K key,
                                             java.util.function.ToLongFunction<? super K> mappingFunction)

Deprecated. Please use computeIfAbsent() instead.

computeIfAbsent

default long computeIfAbsent(K key,
                             it.unimi.dsi.fastutil.objects.Reference2LongFunction<? 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)

computeLongIfAbsentPartial

@Deprecated
default long computeLongIfAbsentPartial(K key,
                                                    it.unimi.dsi.fastutil.objects.Reference2LongFunction<? super K> mappingFunction)

Deprecated. Please use computeIfAbsent() instead.

computeLongIfPresent

default long computeLongIfPresent(K key,
                                  java.util.function.BiFunction<? super K,? super java.lang.Long,? extends java.lang.Long> 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)

computeLong

default long computeLong(K key,
                         java.util.function.BiFunction<? super K,? super java.lang.Long,? extends java.lang.Long> 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 long merge(K key,
                   long value,
                   java.util.function.BiFunction<? super java.lang.Long,? super java.lang.Long,? extends java.lang.Long> 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)

mergeLong

default long mergeLong(K key,
                       long value,
                       java.util.function.LongBinaryOperator 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)

mergeLong

default long mergeLong(K key,
                       long value,
                       it.unimi.dsi.fastutil.longs.LongBinaryOperator 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)

mergeLong

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

Deprecated. Please use merge() instead.

putIfAbsent

@Deprecated
default java.lang.Long putIfAbsent(K key,
                                               java.lang.Long 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.Long>

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.Long>

replace

@Deprecated
default boolean replace(K key,
                                    java.lang.Long oldValue,
                                    java.lang.Long 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.Long>

replace

@Deprecated
default java.lang.Long replace(K key,
                                           java.lang.Long 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.Long>

merge

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