it.unimi.dsi.fastutil.longs

Interface Long2LongMap

All Superinterfaces:

java.util.function.Function<java.lang.Long,java.lang.Long>, Long2LongFunction, java.util.function.LongUnaryOperator, java.util.Map<java.lang.Long,java.lang.Long>

All Known Subinterfaces:

Long2LongSortedMap

All Known Implementing Classes:

AbstractLong2LongMap, AbstractLong2LongSortedMap, Long2LongArrayMap, Long2LongAVLTreeMap, Long2LongLinkedOpenHashMap, Long2LongMaps.EmptyMap, Long2LongMaps.Singleton, Long2LongMaps.SynchronizedMap, Long2LongMaps.UnmodifiableMap, Long2LongOpenCustomHashMap, Long2LongOpenHashMap, Long2LongRBTreeMap, Long2LongSortedMaps.EmptySortedMap, Long2LongSortedMaps.Singleton, Long2LongSortedMaps.SynchronizedSortedMap, Long2LongSortedMaps.UnmodifiableSortedMap

public interface Long2LongMap
extends Long2LongFunction, java.util.Map<java.lang.Long,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 Long2LongMap.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 and Description
static interface	Long2LongMap.Entry A type-specific Map.Entry; provides some additional methods that use polymorphism to avoid (un)boxing.
static interface	Long2LongMap.FastEntrySet 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	compute(long key, java.util.function.BiFunction<? super java.lang.Long,? 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 java.lang.Long	compute(java.lang.Long key, 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 java.lang.Long	computeIfAbsent(java.lang.Long key, java.util.function.Function<? super java.lang.Long,? extends java.lang.Long> mappingFunction) Deprecated. Please use the corresponding type-specific method instead.
default long	computeIfAbsent(long key, java.util.function.LongUnaryOperator 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	computeIfAbsentNullable(long key, java.util.function.LongFunction<? extends java.lang.Long> 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 it is null.
default long	computeIfAbsentPartial(long key, Long2LongFunction 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	computeIfPresent(long key, java.util.function.BiFunction<? super java.lang.Long,? 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.
default java.lang.Long	computeIfPresent(java.lang.Long key, 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.
boolean	containsKey(long key) Returns true if this function contains a mapping for the specified key.
default boolean	containsKey(java.lang.Object key) Deprecated. Please use the corresponding type-specific method instead.
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 ObjectSet<java.util.Map.Entry<java.lang.Long,java.lang.Long>>	entrySet() Deprecated. Please use the corresponding type-specific method instead.
default java.lang.Long	get(java.lang.Object key) Deprecated. Please use the corresponding type-specific method instead.
default long	getOrDefault(long 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.
LongSet	keySet() Note that this specification strengthens the one given in Map.keySet().
ObjectSet<Long2LongMap.Entry>	long2LongEntrySet() Returns a type-specific set view of the mappings contained in this map.
default long	merge(long 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(java.lang.Long 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 java.lang.Long	put(java.lang.Long key, java.lang.Long value) Deprecated. Please use the corresponding type-specific method instead.
default long	putIfAbsent(long 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(java.lang.Long key, java.lang.Long value) Deprecated. Please use the corresponding type-specific method instead.
default boolean	remove(long key, long value) Removes the entry for the specified key only if it is currently mapped to the specified value.
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, java.lang.Object value) Deprecated. Please use the corresponding type-specific method instead.
default long	replace(long key, long value) Replaces the entry for the specified key only if it is currently mapped to some value.
default java.lang.Long	replace(java.lang.Long key, java.lang.Long value) Deprecated. Please use the corresponding type-specific method instead.
default boolean	replace(long key, long oldValue, long newValue) Replaces the entry for the specified key only if currently mapped to the specified value.
default boolean	replace(java.lang.Long 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.
LongCollection	values() Note that this specification strengthens the one given in Map.values().

Methods inherited from interface it.unimi.dsi.fastutil.longs.Long2LongFunction

applyAsLong, get, put, remove

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

apply

Methods inherited from interface java.util.function.Function

andThen, compose, identity

Methods inherited from interface java.util.function.LongUnaryOperator

andThen, compose, identity

Methods inherited from interface java.util.Map

equals, forEach, 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<java.lang.Long,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<java.lang.Long,java.lang.Long>

Throws:

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

See Also:

Map.clear()

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 Long2LongFunction

Parameters:

rv - the new default return value.

See Also:

defaultReturnValue()

defaultReturnValue

long defaultReturnValue()

Gets the default return value.

Specified by:

defaultReturnValue in interface Long2LongFunction

Returns:

the current default return value.

long2LongEntrySet

ObjectSet<Long2LongMap.Entry> long2LongEntrySet()

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 ObjectSet<java.util.Map.Entry<java.lang.Long,java.lang.Long>> entrySet()

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

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 java.util.Map<java.lang.Long,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(java.lang.Long key,
                                       java.lang.Long value)

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

Associates the specified value with the specified key in this function (optional operation).

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

Specified by:

put in interface Long2LongFunction

Specified by:

put in interface java.util.Map<java.lang.Long,java.lang.Long>

Parameters:

key - the key.

value - the value.

Returns:

the old value, or null if no value was present for the given key.

See Also:

Map.put(Object,Object)

get

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

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

Returns the value associated by this function to the specified key.

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

Specified by:

get in interface Long2LongFunction

Specified by:

get in interface java.util.Map<java.lang.Long,java.lang.Long>

Parameters:

key - the key.

Returns:

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

See Also:

Map.get(Object)

remove

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

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

Removes this key and the associated value from this function if it is present (optional operation).

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

Specified by:

remove in interface Long2LongFunction

Specified by:

remove in interface java.util.Map<java.lang.Long,java.lang.Long>

Parameters:

key - the key.

Returns:

the old value, or null if no value was present for the given key.

See Also:

Map.remove(Object)

keySet

LongSet keySet()

Note that this specification strengthens the one given in Map.keySet().

Specified by:

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

Returns:

a set view of the keys contained in this map.

See Also:

Map.keySet()

values

LongCollection values()

Note that this specification strengthens the one given in Map.values().

Specified by:

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

Returns:

a set view of the values contained in this map.

See Also:

Map.values()

containsKey

boolean containsKey(long key)

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

Specified by:

containsKey in interface Long2LongFunction

Parameters:

key - the key.

Returns:

true if this function associates a value to key.

See Also:

Map.containsKey(Object)

containsKey

@Deprecated
default boolean containsKey(java.lang.Object key)

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

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

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

Specified by:

containsKey in interface Long2LongFunction

Specified by:

containsKey in interface java.util.Map<java.lang.Long,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<java.lang.Long,java.lang.Long>

getOrDefault

default long getOrDefault(long 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.

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)

putIfAbsent

default long putIfAbsent(long 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(long 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(long 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(long 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(long key,
                             java.util.function.LongUnaryOperator 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)

computeIfAbsentNullable

default long computeIfAbsentNullable(long key,
                                     java.util.function.LongFunction<? extends java.lang.Long> 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 it is null.

Note that this version of computeIfAbsent() should be used only if you plan to return null in the mapping function.

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, or the default return value if the computed value is null.

Since:

8.0.0

See Also:

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

computeIfAbsentPartial

default long computeIfAbsentPartial(long key,
                                    Long2LongFunction 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)

computeIfPresent

default long computeIfPresent(long key,
                              java.util.function.BiFunction<? super java.lang.Long,? 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)

compute

default long compute(long key,
                     java.util.function.BiFunction<? super java.lang.Long,? 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(long 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)

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<java.lang.Long,java.lang.Long>

putIfAbsent

@Deprecated
default java.lang.Long putIfAbsent(java.lang.Long 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<java.lang.Long,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<java.lang.Long,java.lang.Long>

replace

@Deprecated
default boolean replace(java.lang.Long 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<java.lang.Long,java.lang.Long>

replace

@Deprecated
default java.lang.Long replace(java.lang.Long 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<java.lang.Long,java.lang.Long>

computeIfAbsent

@Deprecated
default java.lang.Long computeIfAbsent(java.lang.Long key,
                                                   java.util.function.Function<? super java.lang.Long,? extends java.lang.Long> mappingFunction)

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

This default implementation just delegates to the corresponding Map method.

Specified by:

computeIfAbsent in interface java.util.Map<java.lang.Long,java.lang.Long>

computeIfPresent

@Deprecated
default java.lang.Long computeIfPresent(java.lang.Long key,
                                                    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:

computeIfPresent in interface java.util.Map<java.lang.Long,java.lang.Long>

compute

@Deprecated
default java.lang.Long compute(java.lang.Long key,
                                           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:

compute in interface java.util.Map<java.lang.Long,java.lang.Long>

merge

@Deprecated
default java.lang.Long merge(java.lang.Long 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<java.lang.Long,java.lang.Long>