MutableLongObjectMap

public final class MutableLongObjectMap<V extends Object> extends LongObjectMap

java.lang.Object
   ↳ androidx.collection.LongObjectMap
     ↳ androidx.collection.MutableLongObjectMap

MutableLongObjectMap is a container with a MutableMap-like interface for keys with Long primitives and reference type values.

The underlying implementation is designed to avoid allocations from boxing, and insertion, removal, retrieval, and iteration operations. Allocations may still happen on insertion when the underlying storage needs to grow to accommodate newly added entries to the table. In addition, this implementation minimizes memory usage by avoiding the use of separate objects to hold key/value pairs.

This implementation makes no guarantee as to the order of the keys and values stored, nor does it make guarantees that the order remains constant over time.

This implementation is not thread-safe: if multiple threads access this container concurrently, and one or more threads modify the structure of the map (insertion or removal for instance), the calling code must provide the appropriate synchronization. Multiple threads are safe to read from this map concurrently if no write is happening.

See also
ScatterMap

Summary

Public constructors
<V extends Object> MutableLongObjectMap(int initialCapacity)

Creates a new MutableLongObjectMap

Public methods
final void

Removes all mappings from this map.
final @NonNull V
getOrPut(long key, @NonNull Function0<@NonNull V> defaultValue)

Returns the value to which the specified key is mapped, if the value is present in the map and not null.
final void
minusAssign(long key)

Removes the specified key and its associated value from the map.
final void
minusAssign(@NonNull long[] keys)

Removes the specified keys and their associated value from the map.
final void

Removes the specified keys and their associated value from the map.
final void

Removes the specified keys and their associated value from the map.
final void

Puts all the key/value mappings in the from map into this map.
final V
put(long key, @NonNull V value)

Creates a new mapping from key to value in this map.
final void

Puts all the key/value mappings in the from map into this map.
final V
remove(long key)

Removes the specified key and its associated value from the map.
final boolean
remove(long key, @NonNull V value)

Removes the specified key and its associated value from the map if the associated value equals value.
final void
removeIf(
    @NonNull Function2<@NonNull Long, @NonNull V, @NonNull Boolean> predicate
)

Removes any mapping for which the specified predicate returns true.
final void
set(long key, @NonNull V value)

Creates a new mapping from key to value in this map.
final int

Trims this MutableLongObjectMap's storage so it is sized appropriately to hold the current mappings.

Inherited methods
From androidx.collection.LongObjectMap
final boolean
all(@NonNull Function2<@NonNull Long, @NonNull V, @NonNull Boolean> predicate)

Returns true if all entries match the given predicate.
final boolean
any()

Returns true if this map has at least one entry.
final boolean
any(@NonNull Function2<@NonNull Long, @NonNull V, @NonNull Boolean> predicate)

Returns true if at least one entry matches the given predicate.
final boolean
contains(long key)

Returns true if the specified key is present in this map, false otherwise.
final boolean
containsKey(long key)

Returns true if the specified key is present in this map, false otherwise.
final boolean

Returns true if the specified value is present in this map, false otherwise.
final int

Returns the number of entries in this map.
final int
count(
    @NonNull Function2<@NonNull Long, @NonNull V, @NonNull Boolean> predicate
)

Returns the number of entries matching the given predicate.
boolean
equals(Object other)

Compares the specified object other with this hash map for equality.
final void
forEach(@NonNull Function2<@NonNull Long, @NonNull value, Unit> block)

Iterates over every key/value pair stored in this map by invoking the specified block lambda.
final void
forEachKey(@NonNull Function1<@NonNull Long, Unit> block)

Iterates over every key stored in this map by invoking the specified block lambda.
final void
forEachValue(@NonNull Function1<@NonNull value, Unit> block)

Iterates over every value stored in this map by invoking the specified block lambda.
final V
get(long key)

Returns the value corresponding to the given key, or null if such a key is not present in the map.
final int

Returns the number of key-value pairs that can be stored in this map without requiring internal storage reallocation.
final @NonNull V
getOrDefault(long key, @NonNull V defaultValue)

Returns the value to which the specified key is mapped, or defaultValue if this map contains no mapping for the key.
final @NonNull V
getOrElse(long key, @NonNull Function0<@NonNull V> defaultValue)

Returns the value for the given key if the value is present and not null.
final int

Returns the number of key-value pairs in this map.
int

Returns the hash code value for this map.
final boolean

Indicates whether this map is empty.
final boolean

Returns true if this map is not empty.
final @NonNull String
joinToString(
    @NonNull CharSequence separator,
    @NonNull CharSequence prefix,
    @NonNull CharSequence postfix,
    int limit,
    @NonNull CharSequence truncated
)

Creates a String from the entries, separated by separator and using prefix before and postfix after, if supplied.
final @NonNull String
joinToString(
    @NonNull CharSequence separator,
    @NonNull CharSequence prefix,
    @NonNull CharSequence postfix,
    int limit,
    @NonNull CharSequence truncated,
    @NonNull Function2<@NonNull Long, @NonNull value, @NonNull CharSequence> transform
)

Creates a String from the entries, separated by separator and using prefix before and postfix after, if supplied.
final boolean

Returns true if this map has no entries.
@NonNull String

Returns a string representation of this map.

Public constructors

MutableLongObjectMap

public <V extends Object> MutableLongObjectMap(int initialCapacity)

Creates a new MutableLongObjectMap

Parameters
int initialCapacity

The initial desired capacity for this container. the container will honor this value by guaranteeing its internal structures can hold that many entries without requiring any allocations. The initial capacity can be set to 0.

Public methods

clear

Added in 1.4.0
public final void clear()

Removes all mappings from this map.

getOrPut

Added in 1.4.0
public final @NonNull V getOrPut(long key, @NonNull Function0<@NonNull V> defaultValue)

Returns the value to which the specified key is mapped, if the value is present in the map and not null. Otherwise, calls defaultValue() and puts the result in the map associated with key.

minusAssign

Added in 1.4.0
public final void minusAssign(long key)

Removes the specified key and its associated value from the map.

minusAssign

Added in 1.4.0
public final void minusAssign(@NonNull long[] keys)

Removes the specified keys and their associated value from the map.

minusAssign

Added in 1.4.0
public final void minusAssign(@NonNull LongList keys)

Removes the specified keys and their associated value from the map.

minusAssign

Added in 1.4.0
public final void minusAssign(@NonNull LongSet keys)

Removes the specified keys and their associated value from the map.

plusAssign

Added in 1.4.0
public final void plusAssign(@NonNull LongObjectMap<@NonNull V> from)

Puts all the key/value mappings in the from map into this map.

put

Added in 1.4.0
public final V put(long key, @NonNull V value)

Creates a new mapping from key to value in this map. If key is already present in the map, the association is modified and the previously associated value is replaced with value. If key is not present, a new entry is added to the map, which may require to grow the underlying storage and cause allocations. Return the previous value associated with the key, or null if the key was not present in the map.

putAll

Added in 1.4.0
public final void putAll(@NonNull LongObjectMap<@NonNull V> from)

Puts all the key/value mappings in the from map into this map.

remove

Added in 1.4.0
public final V remove(long key)

Removes the specified key and its associated value from the map. If the key was present in the map, this function returns the value that was present before removal.

remove

Added in 1.4.0
public final boolean remove(long key, @NonNull V value)

Removes the specified key and its associated value from the map if the associated value equals value. Returns whether the removal happened.

removeIf

Added in 1.4.0
public final void removeIf(
    @NonNull Function2<@NonNull Long, @NonNull V, @NonNull Boolean> predicate
)

Removes any mapping for which the specified predicate returns true.

set

Added in 1.4.0
public final void set(long key, @NonNull V value)

Creates a new mapping from key to value in this map. If key is already present in the map, the association is modified and the previously associated value is replaced with value. If key is not present, a new entry is added to the map, which may require to grow the underlying storage and cause allocations.

trim

Added in 1.4.0
public final int trim()

Trims this MutableLongObjectMap's storage so it is sized appropriately to hold the current mappings.

Returns the number of empty entries removed from this map's storage. Returns be 0 if no trimming is necessary or possible.