speiger.src.collections.longs.utils.maps

Class Long2LongMaps.SynchronizedMap

java.lang.Object

java.util.AbstractMap<java.lang.Long,java.lang.Long>

speiger.src.collections.longs.maps.abstracts.AbstractLong2LongMap

speiger.src.collections.longs.utils.maps.Long2LongMaps.SynchronizedMap

All Implemented Interfaces:

java.util.function.LongUnaryOperator, java.util.Map<java.lang.Long,java.lang.Long>, Long2LongFunction, Long2LongMap

Direct Known Subclasses:

Long2LongMaps.SynchronizedOrderedMap, Long2LongMaps.SynchronizedSortedMap

Enclosing class:

Long2LongMaps

public static class Long2LongMaps.SynchronizedMap
extends AbstractLong2LongMap
implements Long2LongMap

The Synchronized Map implementation used by the synchronizedMap helper function

Nested Class Summary

Nested classes/interfaces inherited from class speiger.src.collections.longs.maps.abstracts.AbstractLong2LongMap

AbstractLong2LongMap.BasicEntry

Nested classes/interfaces inherited from class java.util.AbstractMap

java.util.AbstractMap.SimpleEntry<K,V>, java.util.AbstractMap.SimpleImmutableEntry<K,V>

Nested classes/interfaces inherited from interface speiger.src.collections.longs.maps.interfaces.Long2LongMap

Long2LongMap.BuilderCache, Long2LongMap.Entry, Long2LongMap.FastEntrySet, Long2LongMap.MapBuilder

Method Summary

Modifier and Type	Method and Description
long	addTo(long key, long value) A Helper method to add a primitives together.
void	addToAll(Long2LongMap m) A Helper method to bulk add primitives together.
void	clear() Deprecated.
java.lang.Long	compute(java.lang.Long key, java.util.function.BiFunction<? super java.lang.Long,? super java.lang.Long,? extends java.lang.Long> mappingFunction) Deprecated.
java.lang.Long	computeIfAbsent(java.lang.Long key, java.util.function.Function<? super java.lang.Long,? extends java.lang.Long> mappingFunction) Deprecated.
java.lang.Long	computeIfPresent(java.lang.Long key, java.util.function.BiFunction<? super java.lang.Long,? super java.lang.Long,? extends java.lang.Long> mappingFunction) Deprecated.
long	computeLong(long key, LongLongUnaryOperator mappingFunction) A Type Specific compute method to reduce boxing/unboxing
long	computeLongIfAbsent(long key, Long2LongFunction mappingFunction) A Type Specific compute method to reduce boxing/unboxing
long	computeLongIfPresent(long key, LongLongUnaryOperator mappingFunction) A Type Specific compute method to reduce boxing/unboxing
boolean	containsKey(long key) Type Specific method to reduce boxing/unboxing of values
boolean	containsKey(java.lang.Object key) Deprecated.
boolean	containsValue(long value) Type Specific method to reduce boxing/unboxing of values
boolean	containsValue(java.lang.Object value) Deprecated.
Long2LongMap	copy() A Function that does a shallow clone of the Map itself.
void	forEach(java.util.function.BiConsumer<? super java.lang.Long,? super java.lang.Long> action) Deprecated.
void	forEach(LongLongConsumer action) Type Specific forEach method to reduce boxing/unboxing
long	get(long key) A Type Specific get method to reduce boxing/unboxing
java.lang.Long	get(java.lang.Object key) Deprecated.
long	getDefaultReturnValue() Method to see what the default return value is.
long	getOrDefault(long key, long defaultValue) A Type Specific getOrDefault method to reduce boxing/unboxing
java.lang.Long	getOrDefault(java.lang.Object key, java.lang.Long defaultValue) Deprecated.
LongSet	keySet()
ObjectSet<Long2LongMap.Entry>	long2LongEntrySet() Type Sensitive EntrySet to reduce boxing/unboxing and optionally Temp Object Allocation.
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> mappingFunction) Deprecated.
void	mergeAllLong(Long2LongMap m, LongLongUnaryOperator mappingFunction) A Bulk method for merging Maps.
long	mergeLong(long key, long value, LongLongUnaryOperator mappingFunction) A Type Specific merge method to reduce boxing/unboxing
long	put(long key, long value) Type Specific method to reduce boxing/unboxing of values
java.lang.Long	put(java.lang.Long key, java.lang.Long value) Deprecated.
void	putAll(long[] keys, long[] values, int offset, int size) Type Specific array method to bulk add elements into a map without creating a wrapper and increasing performances
void	putAll(Long2LongMap m) Type Specific function for the bull putting of values
void	putAll(java.util.Map<? extends java.lang.Long,? extends java.lang.Long> m)
void	putAllIfAbsent(Long2LongMap m) Type-Specific bulk put method put elements into the map if not present.
long	putIfAbsent(long key, long value) Type Specific method to reduce boxing/unboxing of values
java.lang.Long	putIfAbsent(java.lang.Long key, java.lang.Long value) Deprecated.
long	remove(long key) Type Specific remove function to reduce boxing/unboxing
boolean	remove(long key, long value) Type Specific remove function to reduce boxing/unboxing
java.lang.Long	remove(java.lang.Object key) Deprecated.
boolean	remove(java.lang.Object key, java.lang.Object value) Deprecated.
long	removeOrDefault(long key, long defaultValue) Type-Specific Remove function with a default return value if wanted.
long	replace(long key, long value) A Type Specific replace method to reduce boxing/unboxing replace an existing value
java.lang.Long	replace(java.lang.Long key, java.lang.Long value) Deprecated.
boolean	replace(long key, long oldValue, long newValue) A Type Specific replace method to replace an existing value
boolean	replace(java.lang.Long key, java.lang.Long oldValue, java.lang.Long newValue) Deprecated.
void	replaceAll(java.util.function.BiFunction<? super java.lang.Long,? super java.lang.Long,? extends java.lang.Long> mappingFunction) Deprecated.
void	replaceLongs(Long2LongMap m) Type-Specific bulk replace method.
void	replaceLongs(LongLongUnaryOperator mappingFunction) A Type Specific mass replace method to reduce boxing/unboxing
AbstractLong2LongMap	setDefaultReturnValue(long v) Method to define the default return value if a requested key isn't present
int	size()
long	subFrom(long key, long value) A Helper method to subtract from primitive from each other.
long	supplyLongIfAbsent(long key, LongSupplier valueProvider) A Supplier based computeIfAbsent function to fill the most used usecase of this function
LongCollection	values()

Methods inherited from class speiger.src.collections.longs.maps.abstracts.AbstractLong2LongMap

entrySet, equals, hashCode, putAll

Methods inherited from class java.util.AbstractMap

isEmpty, toString

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface speiger.src.collections.longs.maps.interfaces.Long2LongMap

builder, entrySet, putAll, putAll, putAll, synchronize, synchronize, unmodifiable

Methods inherited from interface java.util.Map

equals, hashCode, isEmpty

Methods inherited from interface speiger.src.collections.longs.functions.function.Long2LongFunction

applyAsLong

Methods inherited from interface java.util.function.LongUnaryOperator

andThen, compose, identity

Method Detail

getDefaultReturnValue

public long getDefaultReturnValue()

Description copied from interface: Long2LongMap

Method to see what the default return value is.

Specified by:

getDefaultReturnValue in interface Long2LongMap

Overrides:

getDefaultReturnValue in class AbstractLong2LongMap

Returns:

default return value

setDefaultReturnValue

public AbstractLong2LongMap setDefaultReturnValue(long v)

Description copied from interface: Long2LongMap

Method to define the default return value if a requested key isn't present

Specified by:

setDefaultReturnValue in interface Long2LongMap

Overrides:

setDefaultReturnValue in class AbstractLong2LongMap

Parameters:

v - value that should be the default return value

Returns:

itself

put

public long put(long key,
                long value)

Description copied from interface: Long2LongMap

Type Specific method to reduce boxing/unboxing of values

Specified by:

put in interface Long2LongMap

Parameters:

key - the key that should be inserted,

value - the value that should be inserted

Returns:

the last present value or default return value.

See Also:

Map.put(Object, Object)

putIfAbsent

public long putIfAbsent(long key,
                        long value)

Description copied from interface: Long2LongMap

Type Specific method to reduce boxing/unboxing of values

Specified by:

putIfAbsent in interface Long2LongMap

Parameters:

key - the key that should be inserted,

value - the value that should be inserted

Returns:

the last present value or default return value.

See Also:

Map.putIfAbsent(Object, Object)

putAllIfAbsent

public void putAllIfAbsent(Long2LongMap m)

Description copied from interface: Long2LongMap

Type-Specific bulk put method put elements into the map if not present.

Specified by:

putAllIfAbsent in interface Long2LongMap

Overrides:

putAllIfAbsent in class AbstractLong2LongMap

Parameters:

m - elements that should be added if not present.

addTo

public long addTo(long key,
                  long value)

Description copied from interface: Long2LongMap

A Helper method to add a primitives together. If key is not present then this functions as a put.

Specified by:

addTo in interface Long2LongMap

Parameters:

key - the key that should be inserted,

value - the value that should be inserted / added

Returns:

the last present value or default return value.

subFrom

public long subFrom(long key,
                    long value)

Description copied from interface: Long2LongMap

A Helper method to subtract from primitive from each other. If the key is not present it will just return the defaultValue How the implementation works is that it will subtract from the current value (if not present it will do nothing) and fence it to the Long2LongMap.getDefaultReturnValue() If the fence is reached the element will be automaticall removed

Specified by:

subFrom in interface Long2LongMap

Parameters:

key - that should be subtract from

value - that should be subtract

Returns:

the last present or default return value

addToAll

public void addToAll(Long2LongMap m)

Description copied from interface: Long2LongMap

A Helper method to bulk add primitives together.

Specified by:

addToAll in interface Long2LongMap

Overrides:

addToAll in class AbstractLong2LongMap

Parameters:

m - the values that should be added/inserted

putAll

public void putAll(Long2LongMap m)

Description copied from interface: Long2LongMap

Type Specific function for the bull putting of values

Specified by:

putAll in interface Long2LongMap

Overrides:

putAll in class AbstractLong2LongMap

Parameters:

m - the elements that should be inserted

putAll

public void putAll(java.util.Map<? extends java.lang.Long,? extends java.lang.Long> m)

Specified by:

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

Overrides:

putAll in class AbstractLong2LongMap

putAll

public void putAll(long[] keys,
                   long[] values,
                   int offset,
                   int size)

Description copied from interface: Long2LongMap

Type Specific array method to bulk add elements into a map without creating a wrapper and increasing performances

Specified by:

putAll in interface Long2LongMap

Overrides:

putAll in class AbstractLong2LongMap

Parameters:

keys - the keys that should be added

values - the values that should be added

offset - where the to start in the array

size - how many elements should be added

See Also:

Map.putAll(Map)

containsKey

public boolean containsKey(long key)

Description copied from interface: Long2LongMap

Type Specific method to reduce boxing/unboxing of values

Specified by:

containsKey in interface Long2LongMap

Overrides:

containsKey in class AbstractLong2LongMap

Parameters:

key - element that is searched for

Returns:

if the key is present

containsValue

public boolean containsValue(long value)

Description copied from interface: Long2LongMap

Type Specific method to reduce boxing/unboxing of values

Specified by:

containsValue in interface Long2LongMap

Overrides:

containsValue in class AbstractLong2LongMap

Parameters:

value - element that is searched for

Returns:

if the value is present

get

public long get(long key)

Description copied from interface: Long2LongMap

A Type Specific get method to reduce boxing/unboxing

Specified by:

get in interface Long2LongFunction

Specified by:

get in interface Long2LongMap

Parameters:

key - the key that is searched for

Returns:

the searched value or default return value

remove

public long remove(long key)

Description copied from interface: Long2LongMap

Type Specific remove function to reduce boxing/unboxing

Specified by:

remove in interface Long2LongMap

Parameters:

key - the element that should be removed

Returns:

the value that was removed or default return value

removeOrDefault

public long removeOrDefault(long key,
                            long defaultValue)

Description copied from interface: Long2LongMap

Type-Specific Remove function with a default return value if wanted.

Specified by:

removeOrDefault in interface Long2LongMap

Parameters:

key - the element that should be removed

defaultValue - the value that should be returned if the entry doesn't exist

Returns:

the value that was removed or default value

See Also:

Map.remove(Object, Object)

remove

public boolean remove(long key,
                      long value)

Description copied from interface: Long2LongMap

Type Specific remove function to reduce boxing/unboxing

Specified by:

remove in interface Long2LongMap

Parameters:

key - the element that should be removed

value - the expected value that should be found

Returns:

true if the key and value was found and removed

See Also:

Map.remove(Object, Object)

replace

public boolean replace(long key,
                       long oldValue,
                       long newValue)

Description copied from interface: Long2LongMap

A Type Specific replace method to replace an existing value

Specified by:

replace in interface Long2LongMap

Overrides:

replace in class AbstractLong2LongMap

Parameters:

key - the element that should be searched for

oldValue - the expected value to be replaced

newValue - the value to replace the oldValue with.

Returns:

true if the value got replaced

replace

public long replace(long key,
                    long value)

Description copied from interface: Long2LongMap

A Type Specific replace method to reduce boxing/unboxing replace an existing value

Specified by:

replace in interface Long2LongMap

Overrides:

replace in class AbstractLong2LongMap

Parameters:

key - the element that should be searched for

value - the value to replace with.

Returns:

the present value or default return value

replaceLongs

public void replaceLongs(Long2LongMap m)

Description copied from interface: Long2LongMap

Type-Specific bulk replace method. Could be seen as putAllIfPresent

Specified by:

replaceLongs in interface Long2LongMap

Overrides:

replaceLongs in class AbstractLong2LongMap

Parameters:

m - elements that should be replaced.

replaceLongs

public void replaceLongs(LongLongUnaryOperator mappingFunction)

Description copied from interface: Long2LongMap

A Type Specific mass replace method to reduce boxing/unboxing

Specified by:

replaceLongs in interface Long2LongMap

Overrides:

replaceLongs in class AbstractLong2LongMap

Parameters:

mappingFunction - operation to replace all values

computeLong

public long computeLong(long key,
                        LongLongUnaryOperator mappingFunction)

Description copied from interface: Long2LongMap

A Type Specific compute method to reduce boxing/unboxing

Specified by:

computeLong in interface Long2LongMap

Overrides:

computeLong in class AbstractLong2LongMap

Parameters:

key - the key that should be computed

mappingFunction - the operator that should generate the value

Returns:

the result of the computation

computeLongIfAbsent

public long computeLongIfAbsent(long key,
                                Long2LongFunction mappingFunction)

Description copied from interface: Long2LongMap

A Type Specific compute method to reduce boxing/unboxing

Specified by:

computeLongIfAbsent in interface Long2LongMap

Overrides:

computeLongIfAbsent in class AbstractLong2LongMap

Parameters:

key - the key that should be computed

mappingFunction - the operator that should generate the value if not present

Returns:

the result of the computed value or present value

computeLongIfPresent

public long computeLongIfPresent(long key,
                                 LongLongUnaryOperator mappingFunction)

Description copied from interface: Long2LongMap

A Type Specific compute method to reduce boxing/unboxing

Specified by:

computeLongIfPresent in interface Long2LongMap

Overrides:

computeLongIfPresent in class AbstractLong2LongMap

Parameters:

key - the key that should be computed

mappingFunction - the operator that should generate the value if present

Returns:

the result of the default return value or present value

supplyLongIfAbsent

public long supplyLongIfAbsent(long key,
                               LongSupplier valueProvider)

Description copied from interface: Long2LongMap

A Supplier based computeIfAbsent function to fill the most used usecase of this function

Specified by:

supplyLongIfAbsent in interface Long2LongMap

Overrides:

supplyLongIfAbsent in class AbstractLong2LongMap

Parameters:

key - the key that should be computed

valueProvider - the value if not present

Returns:

the result of the computed value or present value

mergeLong

public long mergeLong(long key,
                      long value,
                      LongLongUnaryOperator mappingFunction)

Description copied from interface: Long2LongMap

A Type Specific merge method to reduce boxing/unboxing

Specified by:

mergeLong in interface Long2LongMap

Overrides:

mergeLong in class AbstractLong2LongMap

Parameters:

key - the key that should be be searched for

value - the value that should be merged with

mappingFunction - the operator that should generate the new Value

Returns:

the result of the merge

mergeAllLong

public void mergeAllLong(Long2LongMap m,
                         LongLongUnaryOperator mappingFunction)

Description copied from interface: Long2LongMap

A Bulk method for merging Maps.

Specified by:

mergeAllLong in interface Long2LongMap

Overrides:

mergeAllLong in class AbstractLong2LongMap

Parameters:

m - the entries that should be bulk added

mappingFunction - the operator that should generate the new Value

getOrDefault

public long getOrDefault(long key,
                         long defaultValue)

Description copied from interface: Long2LongMap

A Type Specific getOrDefault method to reduce boxing/unboxing

Specified by:

getOrDefault in interface Long2LongMap

Overrides:

getOrDefault in class AbstractLong2LongMap

Parameters:

key - the key that is searched for

defaultValue - the value that should be returned if the key is not present

Returns:

the searched value or defaultValue value

forEach

public void forEach(LongLongConsumer action)

Description copied from interface: Long2LongMap

Type Specific forEach method to reduce boxing/unboxing

Specified by:

forEach in interface Long2LongMap

Overrides:

forEach in class AbstractLong2LongMap

Parameters:

action - processor of the values that are iterator over

size

public int size()

Specified by:

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

Overrides:

size in class java.util.AbstractMap<java.lang.Long,java.lang.Long>

copy

public Long2LongMap copy()

Description copied from interface: Long2LongMap

A Function that does a shallow clone of the Map itself. This function is more optimized then a copy constructor since the Map does not have to be unsorted/resorted. It can be compared to Cloneable but with less exception risk

Specified by:

copy in interface Long2LongMap

Overrides:

copy in class AbstractLong2LongMap

Returns:

a Shallow Copy of the Map

keySet

public LongSet keySet()

Specified by:

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

Specified by:

keySet in interface Long2LongMap

Overrides:

keySet in class AbstractLong2LongMap

values

public LongCollection values()

Specified by:

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

Specified by:

values in interface Long2LongMap

Overrides:

values in class AbstractLong2LongMap

long2LongEntrySet

public ObjectSet<Long2LongMap.Entry> long2LongEntrySet()

Description copied from interface: Long2LongMap

Type Sensitive EntrySet to reduce boxing/unboxing and optionally Temp Object Allocation.

Specified by:

long2LongEntrySet in interface Long2LongMap

Returns:

a EntrySet of the collection

get

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

Deprecated.

Specified by:

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

Specified by:

get in interface Long2LongMap

Overrides:

get in class AbstractLong2LongMap

getOrDefault

@Deprecated
public java.lang.Long getOrDefault(java.lang.Object key,
                                                java.lang.Long defaultValue)

Deprecated.

Specified by:

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

Specified by:

getOrDefault in interface Long2LongMap

Overrides:

getOrDefault in class AbstractLong2LongMap

containsValue

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

Deprecated.

Specified by:

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

Specified by:

containsValue in interface Long2LongMap

Overrides:

containsValue in class java.util.AbstractMap<java.lang.Long,java.lang.Long>

Parameters:

value - that is searched for.

Returns:

true if found

See Also:

Map.containsValue(Object)

containsKey

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

Deprecated.

Specified by:

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

Specified by:

containsKey in interface Long2LongMap

Overrides:

containsKey in class java.util.AbstractMap<java.lang.Long,java.lang.Long>

Parameters:

key - that is searched for.

Returns:

true if found

See Also:

Map.containsKey(Object)

put

@Deprecated
public java.lang.Long put(java.lang.Long key,
                                       java.lang.Long value)

Deprecated.

Specified by:

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

Specified by:

put in interface Long2LongMap

Overrides:

put in class AbstractLong2LongMap

remove

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

Deprecated.

Specified by:

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

Specified by:

remove in interface Long2LongMap

Overrides:

remove in class AbstractLong2LongMap

Parameters:

key - the element that should be removed

Returns:

the value that was removed or default return value

See Also:

Map.remove(Object)

clear

@Deprecated
public void clear()

Deprecated.

Specified by:

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

Overrides:

clear in class java.util.AbstractMap<java.lang.Long,java.lang.Long>

putIfAbsent

@Deprecated
public java.lang.Long putIfAbsent(java.lang.Long key,
                                               java.lang.Long value)

Deprecated.

Specified by:

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

Specified by:

putIfAbsent in interface Long2LongMap

remove

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

Deprecated.

Specified by:

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

Specified by:

remove in interface Long2LongMap

Parameters:

key - the element that should be removed

value - the expected value that should be found

Returns:

true if the key and value was found and removed

See Also:

Map.remove(Object, Object)

replace

@Deprecated
public boolean replace(java.lang.Long key,
                                    java.lang.Long oldValue,
                                    java.lang.Long newValue)

Deprecated.

Specified by:

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

Specified by:

replace in interface Long2LongMap

replace

@Deprecated
public java.lang.Long replace(java.lang.Long key,
                                           java.lang.Long value)

Deprecated.

Specified by:

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

Specified by:

replace in interface Long2LongMap

replaceAll

@Deprecated
public void replaceAll(java.util.function.BiFunction<? super java.lang.Long,? super java.lang.Long,? extends java.lang.Long> mappingFunction)

Deprecated.

Specified by:

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

Specified by:

replaceAll in interface Long2LongMap

compute

@Deprecated
public java.lang.Long compute(java.lang.Long key,
                                           java.util.function.BiFunction<? super java.lang.Long,? super java.lang.Long,? extends java.lang.Long> mappingFunction)

Deprecated.

Specified by:

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

Specified by:

compute in interface Long2LongMap

computeIfAbsent

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

Deprecated.

Specified by:

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

Specified by:

computeIfAbsent in interface Long2LongMap

computeIfPresent

@Deprecated
public java.lang.Long computeIfPresent(java.lang.Long key,
                                                    java.util.function.BiFunction<? super java.lang.Long,? super java.lang.Long,? extends java.lang.Long> mappingFunction)

Deprecated.

Specified by:

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

Specified by:

computeIfPresent in interface Long2LongMap

merge

@Deprecated
public 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> mappingFunction)

Deprecated.

Specified by:

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

Specified by:

merge in interface Long2LongMap

forEach

@Deprecated
public void forEach(java.util.function.BiConsumer<? super java.lang.Long,? super java.lang.Long> action)

Deprecated.

Specified by:

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

Specified by:

forEach in interface Long2LongMap