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link管理  ›  Long2ObjectMap (fastutil 8.5.11)
https://fastutil.di.unimi.it/docs/it/unimi/dsi/fastutil/longs/Long2ObjectMap.html
逆袭的烈马
4 月前
All Superinterfaces:
Function < Long , V> , Function < Long , V> , Long2ObjectFunction <V> , LongFunction <V> , Map < Long , V>
All Known Subinterfaces:
Long2ObjectSortedMap <V>
All Known Implementing Classes:
AbstractLong2ObjectMap , AbstractLong2ObjectSortedMap , Long2ObjectArrayMap , Long2ObjectAVLTreeMap , Long2ObjectLinkedOpenHashMap , Long2ObjectMaps.EmptyMap , Long2ObjectMaps.Singleton , Long2ObjectMaps.SynchronizedMap , Long2ObjectMaps.UnmodifiableMap , Long2ObjectOpenCustomHashMap , Long2ObjectOpenHashMap , Long2ObjectRBTreeMap , Long2ObjectSortedMaps.EmptySortedMap , Long2ObjectSortedMaps.Singleton , Long2ObjectSortedMaps.SynchronizedSortedMap , Long2ObjectSortedMaps.UnmodifiableSortedMap
public interface Long2ObjectMap<V> extends Long2ObjectFunction <V>, Map < Long , V>
A type-specific Map ; provides some additional methods that use polymorphism to avoid (un)boxing, and handling of a default return value. Besides extending the corresponding type-specific function , this interface strengthens Map.entrySet() , keySet() and values() . Moreover, a number of methods, such as size() , defaultReturnValue() , etc., are un-defaulted as their function default do not make sense for a map. Maps returning entry sets of type Long2ObjectMap.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:
Long2ObjectMap.Entry < V >
A type-specific Map.Entry ; provides some additional methods that use polymorphism to avoid (un)boxing.
static interface
Long2ObjectMap.FastEntrySet < V >
An entry set providing fast iteration.

Method Summary

Modifier and Type
Method
Description
default void
clear ()
Removes all of the mappings from this map (optional operation).
default V
compute (long key, BiFunction <? super Long , ? super V , ? extends V > remappingFunction)
Attempts to compute a mapping for the specified key and its current mapped value (or null if there is no current mapping).
default V
computeIfAbsent (long key, Long2ObjectFunction <? extends V > 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 V
computeIfAbsent (long key, LongFunction <? extends V > 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 V
computeIfAbsentPartial (long key, Long2ObjectFunction <? extends V > mappingFunction)
Deprecated.
Please use computeIfAbsent() instead.
default V
computeIfPresent (long key, BiFunction <? super Long , ? super V , ? extends V > 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 (long key)
Returns true if this function contains a mapping for the specified key.
default boolean
containsKey ( Object key)
Deprecated.
Please use the corresponding type-specific method instead.
defaultReturnValue ()
Gets the default return value.
defaultReturnValue ( V rv)
Sets the default return value (optional operation).
default ObjectSet < Map.Entry < Long , V >>
entrySet ()
Deprecated.
Please use the corresponding type-specific method instead.
default void
forEach ( BiConsumer <? super Long , ? super V > consumer)
default V
get ( Object key)
Deprecated.
Please use the corresponding type-specific method instead.
default V
getOrDefault (long key, V defaultValue)
Returns the value to which the specified key is mapped, or the defaultValue if this map contains no mapping for the key.
default V
getOrDefault ( Object key, V defaultValue)
Deprecated.
Please use the corresponding type-specific method instead.
LongSet
keySet ()
ObjectSet < Long2ObjectMap.Entry < V >>
long2ObjectEntrySet ()
Returns a type-specific set view of the mappings contained in this map.
default V
merge (long key, V value, BiFunction <? super V , ? super V , ? extends V > remappingFunction)
If the specified key is not already associated with a value, associates it with the given value .
default V
put ( Long key, V value)
Deprecated.
Please use the corresponding type-specific method instead.
default V
putIfAbsent (long key, V 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 boolean
remove (long key, Object value)
Removes the entry for the specified key only if it is currently mapped to the specified value.
default V
remove ( Object key)
Deprecated.
Please use the corresponding type-specific method instead.
default V
replace (long key, V value)
Replaces the entry for the specified key only if it is currently mapped to some value.
default boolean
replace (long key, V oldValue, V newValue)
Replaces the entry for the specified key only if currently mapped to the specified value.
size ()
Returns the number of key/value mappings in this map.
ObjectCollection < V >
values ()

Methods inherited from interface it.unimi.dsi.fastutil.longs. Long2ObjectFunction

andThenByte , andThenChar , andThenDouble , andThenFloat , andThenInt , andThenLong , andThenObject , andThenReference , andThenShort , apply , compose , composeByte , composeChar , composeDouble , composeFloat , composeInt , composeLong , composeObject , composeReference , composeShort , get , put , remove

Methods inherited from interface java.util. Map

compute , computeIfAbsent , computeIfPresent , containsValue , equals , hashCode , isEmpty , merge , putAll , putIfAbsent , remove , replace , replace , replaceAll
int size ()
Returns the number of key/value mappings in this map. If the map contains more than Integer.MAX_VALUE elements, returns Integer.MAX_VALUE .
Specified by:
size in interface Function < Long , V >
Specified by:
size in interface Map < Long , V >
Returns:
the number of key-value mappings in this map.
See Also:
  • Size64

    • clear

    default void clear ()
    Removes all of the mappings from this map (optional operation). The map will be empty after this call returns.
    Specified by:
    clear in interface Function < Long , V >
    Specified by:
    clear in interface Map < Long , V >
    Throws:
    UnsupportedOperationException - if the clear() operation is not supported by this
    See Also:
  • Map.clear()

    • defaultReturnValue

    void defaultReturnValue ( V rv)
    Sets the default return value (optional operation). This value must be returned by type-specific versions of get() , put() and remove() to denote that the map does not contain the specified key. It must be null by default. Warning : Changing this to a non-null value can have unforeseen consequences. Especially, it breaks compatibility with the specifications of Java's Map interface. It has to be used with great care and thorough study of all method comments is recommended.

    Specified by:
    defaultReturnValue in interface Long2ObjectFunction < V >
    Parameters:
    rv - the new default return value.
    See Also:
  • defaultReturnValue()

    • long2ObjectEntrySet

    ObjectSet < Long2ObjectMap.Entry < V >> long2ObjectEntrySet ()
    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()
    • default ObjectSet < Map.Entry < Long , V >> 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 Map < Long , V >
    Returns:
    a set view of the mappings contained in this map.
    See Also:
  • Map.entrySet()
    • API Notes:
    Note that this specification strengthens the one given in Map.entrySet() .
    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 Function < Long , V >
    Specified by:
    put in interface Long2ObjectFunction < V >
    Specified by:
    put in interface Map < Long , V >
    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)
    • default V get ( 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 Function < Long , V >
    Specified by:
    get in interface Long2ObjectFunction < V >
    Specified by:
    get in interface Map < Long , V >
    Parameters:
    key - the key.
    Returns:
    the corresponding value, or null if no value was present for the given key.
    See Also:
  • Map.get(Object)
    • default V remove ( 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 Function < Long , V >
    Specified by:
    remove in interface Long2ObjectFunction < V >
    Specified by:
    remove in interface Map < Long , V >
    Parameters:
    key - the key.
    Returns:
    the old value, or null if no value was present for the given key.
    See Also:
  • Map.remove(Object)
    • values in interface Map < Long , V >
    Returns:
    a set view of the values contained in this map.
    See Also:
  • Map.values()
    • API Notes:
    Note that this specification strengthens the one given in Map.values() .

    containsKey

    boolean containsKey (long key)
    Returns true if this function contains a mapping for the specified key.
    Specified by:
    containsKey in interface Long2ObjectFunction < V >
    Parameters:
    key - the key.
    Returns:
    true if this function associates a value to key .
    See Also:
  • Map.containsKey(Object)
    • default boolean containsKey ( 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 Function < Long , V >
    Specified by:
    containsKey in interface Long2ObjectFunction < V >
    Specified by:
    containsKey in interface Map < Long , V >
    Parameters:
    key - the key.
    Returns:
    true if this function associates a value to key .
    See Also:
  • Map.containsKey(Object)
    • default V getOrDefault (long key, V 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 Long2ObjectFunction < V >
    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)
    • Please use the corresponding type-specific method instead.
    Returns the value associated by this function to the specified key, or give the specified value if not present. This default implementation just delegates to the corresponding Map method.

    Specified by:
    getOrDefault in interface Function < Long , V >
    Specified by:
    getOrDefault in interface Long2ObjectFunction < V >
    Specified by:
    getOrDefault in interface Map < Long , V >
    Parameters:
    key - the key.
    defaultValue - the default value to return if not present.
    Returns:
    the corresponding value, or defaultValue if no value was present for the given key.
    See Also:
  • Map.getOrDefault(Object, Object)
    • default V putIfAbsent (long key, V 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
    Since:
    8.0.0
    See Also:
  • Map.putIfAbsent(Object, Object)
    • default boolean remove (long key, Object 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)
    • V oldValue, V 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)
    • default V replace (long key, V 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
    Since:
    8.0.0
    See Also:
  • Map.replace(Object, Object)

    • computeIfAbsent

    default V computeIfAbsent (long key, LongFunction <? extends V > 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)
    • API Notes:
    all computeIfAbsent() methods have a different logic based on the argument; no delegation is performed, contrarily to other superficially similar methods such as Iterator.forEachRemaining(java.util.function.Consumer<? super E>) or List.replaceAll(java.util.function.UnaryOperator<E>) .

    computeIfAbsent

    default V computeIfAbsent (long key, Long2ObjectFunction <? extends V > 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)
    • API Notes:
    all computeIfAbsent() methods have a different logic based on the argument; no delegation is performed, contrarily to other superficially similar methods such as Iterator.forEachRemaining(java.util.function.Consumer<? super E>) or List.replaceAll(java.util.function.UnaryOperator<E>) .
    @Deprecated default V computeIfAbsentPartial (long key, Long2ObjectFunction <? extends V > mappingFunction)
    Deprecated.
    Please use computeIfAbsent() instead.

    computeIfPresent

    default V computeIfPresent (long key, BiFunction <? super Long , ? super V , ? extends V > 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)
    • API Notes:
    The JDK specification for this method equates not being associated with a value with being associated with {code null}. This is not the case for this method.

    compute

    default V compute (long key, BiFunction <? super Long , ? super V , ? extends V > 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)
    • default V merge (long key, V value, BiFunction <? super V , ? super V , ? extends V > 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)
    • API Notes:
    The JDK specification for this method equates not being associated with a value with being associated with {code null}. This is not the case for this method.
     
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