MutableScatterSet

Artifact: androidx.collection:collection

Added in 1.4.0

Kotlin |Java

Cmn

class MutableScatterSet<E : Any?> : ScatterSet

kotlin.Any
↳	androidx.collection.ScatterSet
	↳	androidx.collection.MutableScatterSet

MutableScatterSet is a container with a MutableSet-like interface based on a flat hash table implementation. The underlying implementation is designed to avoid all allocations on insertion, removal, retrieval, and iteration. Allocations may still happen on insertion when the underlying storage needs to grow to accommodate newly added elements to the set.

This implementation makes no guarantee as to the order of the elements 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 set (insertion or removal for instance), the calling code must provide the appropriate synchronization. Concurrent reads are however safe.

Note: when a Set is absolutely necessary, you can use the method asSet to create a thin wrapper around a MutableScatterSet. Please refer to asSet for more details and caveats.

Note: when a MutableSet is absolutely necessary, you can use the method asMutableSet to create a thin wrapper around a MutableScatterSet. Please refer to asMutableSet for more details and caveats.

See also
`Set`

Summary

Public constructors
`<E : Any?> MutableScatterSet(initialCapacity: Int)` Creates a new `MutableScatterSet`	Cmn

Public functions
`Boolean`	`add(element: E)` Adds the specified element to the set.	Cmn
`Boolean`	`addAll(elements: Array<E>)` Adds all the `elements` into this set.	Cmn
`Boolean`	`addAll(elements: Iterable<E>)` Adds all the `elements` into this set.	Cmn
`Boolean`	`addAll(elements: ObjectList<E>)` Adds all the elements in the `elements` set into this set.	Cmn
`Boolean`	`addAll(elements: ScatterSet<E>)` Adds all the elements in the `elements` set into this set.	Cmn
`Boolean`	`addAll(elements: Sequence<E>)` Adds all the `elements` into this set.	Cmn
`MutableSet<E>`	`asMutableSet()` Wraps this `ScatterSet` with a `MutableSet` interface.	Cmn
`Unit`	`clear()` Removes all elements from this set.	Cmn
`operator Unit`	`minusAssign(element: E)` Removes the specified `element` from the set if it is present.	Cmn
`operator Unit`	`minusAssign(elements: Array<E>)` Removes the specified `elements` from the set, if present.	Cmn
`operator Unit`	`minusAssign(elements: Iterable<E>)` Removes the specified `elements` from the set, if present.	Cmn
`operator Unit`	`minusAssign(elements: ObjectList<E>)` Removes the specified `elements` from the set, if present.	Cmn
`operator Unit`	`minusAssign(elements: ScatterSet<E>)` Removes the specified `elements` from the set, if present.	Cmn
`operator Unit`	`minusAssign(elements: Sequence<E>)` Removes the specified `elements` from the set, if present.	Cmn
`operator Unit`	`plusAssign(element: E)` Adds the specified element to the set.	Cmn
`operator Unit`	`plusAssign(elements: Array<E>)` Adds all the `elements` into this set.	Cmn
`operator Unit`	`plusAssign(elements: Iterable<E>)` Adds all the `elements` into this set.	Cmn
`operator Unit`	`plusAssign(elements: ObjectList<E>)` Adds all the elements in the `elements` set into this set.	Cmn
`operator Unit`	`plusAssign(elements: ScatterSet<E>)` Adds all the elements in the `elements` set into this set.	Cmn
`operator Unit`	`plusAssign(elements: Sequence<E>)` Adds all the `elements` into this set.	Cmn
`Boolean`	`remove(element: E)` Removes the specified `element` from the set.	Cmn
`Boolean`	`removeAll(elements: Array<E>)` Removes the specified `elements` from the set, if present.	Cmn
`Boolean`	`removeAll(elements: Iterable<E>)` Removes the specified `elements` from the set, if present.	Cmn
`Boolean`	`removeAll(elements: ObjectList<E>)` Removes the specified `elements` from the set, if present.	Cmn
`Boolean`	`removeAll(elements: ScatterSet<E>)` Removes the specified `elements` from the set, if present.	Cmn
`Boolean`	`removeAll(elements: Sequence<E>)` Removes the specified `elements` from the set, if present.	Cmn
`inline Unit`	`removeIf(predicate: (E) -> Boolean)` Removes any values for which the specified `predicate` returns true.	Cmn
`@IntRange(from = 0) Int`	`trim()` Trims this `MutableScatterSet`'s storage so it is sized appropriately to hold the current elements.	Cmn

Inherited functions

From androidx.collection.ScatterSet

`inline Boolean`	`all(predicate: (element) -> Boolean)` Returns true if all elements match the given `predicate`.	Cmn
`Boolean`	`any()` Returns `true` if this set has at least one element.	Cmn
`inline Boolean`	`any(predicate: (element) -> Boolean)` Returns true if at least one element matches the given `predicate`.	Cmn
`Set<E>`	`asSet()` Wraps this `ScatterSet` with a `Set` interface.	Cmn
`operator Boolean`	`contains(element: E)` Returns true if the specified `element` is present in this hash set, false otherwise.	Cmn
`@IntRange(from = 0) Int`	`count()` Returns the number of elements in this set.	Cmn
`inline @IntRange(from = 0) Int`	`count(predicate: (element) -> Boolean)` Returns the number of elements matching the given `predicate`.	Cmn
`open operator Boolean`	`equals(other: Any?)` Compares the specified object `other` with this hash set for equality.	Cmn
`inline E`	`first()` Returns the first element in the collection.	Cmn
`inline E`	`first(predicate: (element) -> Boolean)` Returns the first element in the collection for which `predicate` returns `true`	Cmn
`inline E?`	`firstOrNull(predicate: (element) -> Boolean)` Returns the first element in the collection for which `predicate` returns `true` or `null` if there are no elements that match `predicate`.	Cmn
`inline Unit`	`forEach(block: (element) -> Unit)` Iterates over every element stored in this set by invoking the specified `block` lambda.	Cmn
`open Int`	`hashCode()` Returns the hash code value for this set.	Cmn
`Boolean`	`isEmpty()` Indicates whether this set is empty.	Cmn
`Boolean`	`isNotEmpty()` Returns `true` if this set is not empty.	Cmn
`String`	`joinToString( separator: CharSequence, prefix: CharSequence, postfix: CharSequence, limit: Int, truncated: CharSequence, transform: ((E) -> CharSequence)? )` Creates a String from the elements separated by `separator` and using `prefix` before and `postfix` after, if supplied.	Cmn
`Boolean`	`none()` Returns `true` if this set has no elements.	Cmn
`open String`	`toString()` Returns a string representation of this set.	Cmn

Inherited properties

From androidx.collection.ScatterSet

`Int`	`capacity` Returns the number of elements that can be stored in this set without requiring internal storage reallocation.	Cmn
`Int`	`size` Returns the number of elements in this set.	Cmn

Public constructors

MutableScatterSet

Cmn

<E : Any?> MutableScatterSet(initialCapacity: Int = DefaultScatterCapacity)

Creates a new MutableScatterSet

Parameters
`initialCapacity: Int = DefaultScatterCapacity`	The initial desired capacity for this container. the container will honor this value by guaranteeing its internal structures can hold that many elements without requiring any allocations. The initial capacity can be set to 0.

Public functions

add

Cmn

Added in 1.4.0

fun add(element: E): Boolean

Adds the specified element to the set.

Parameters
`element: E`	The element to add to the set.

Returns
`Boolean`	`true` if the element has been added or `false` if the element is already contained within the set.

addAll

Cmn

Added in 1.4.0

fun addAll(elements: Array<E>): Boolean

Adds all the elements into this set.

Parameters
`elements: Array<E>`	An array of elements to add to the set.

Returns
`Boolean`	`true` if any of the specified elements were added to the collection, `false` if the collection was not modified.

addAll

Cmn

fun addAll(elements: Iterable<E>): Boolean

Adds all the elements into this set.

Parameters
`elements: Iterable<E>`	Iterable elements to add to the set.

Returns
`Boolean`	`true` if any of the specified elements were added to the collection, `false` if the collection was not modified.

addAll

Cmn

Added in 1.4.0

fun addAll(elements: ObjectList<E>): Boolean

Adds all the elements in the elements set into this set.

Parameters
`elements: ObjectList<E>`	An `ObjectList` whose elements are to be added to the set

Returns
`Boolean`	`true` if any of the specified elements were added to the collection, `false` if the collection was not modified.

addAll

Cmn

Added in 1.4.0

fun addAll(elements: ScatterSet<E>): Boolean

Adds all the elements in the elements set into this set.

Parameters
`elements: ScatterSet<E>`	A `ScatterSet` whose elements are to be added to the set

Returns
`Boolean`	`true` if any of the specified elements were added to the collection, `false` if the collection was not modified.

addAll

Cmn

fun addAll(elements: Sequence<E>): Boolean

Adds all the elements into this set.

Parameters
`elements: Sequence<E>`	The sequence of elements to add to the set.

Returns
`Boolean`	`true` if any of the specified elements were added to the collection, `false` if the collection was not modified.

asMutableSet

Cmn

Added in 1.4.0

fun asMutableSet(): MutableSet<E>

Wraps this ScatterSet with a MutableSet interface. The MutableSet is backed by the ScatterSet, so changes to the ScatterSet are reflected in the MutableSet and vice-versa. If the ScatterSet is modified while an iteration over the MutableSet is in progress (and vice- versa), the results of the iteration are undefined.

Note: while this method is useful to use this MutableScatterSet with APIs accepting MutableSet interfaces, it is less efficient to do so than to use MutableScatterSet's APIs directly. While the MutableSet implementation returned by this method tries to be as efficient as possible, the semantics of MutableSet may require the allocation of temporary objects for access and iteration.

clear

Cmn

Added in 1.4.0

fun clear(): Unit

Removes all elements from this set.

minusAssign

Cmn

Added in 1.4.0

operator fun minusAssign(element: E): Unit

Removes the specified element from the set if it is present.

Parameters
`element: E`	The element to be removed from the set.

minusAssign

Cmn

Added in 1.4.0

operator fun minusAssign(elements: Array<E>): Unit

Removes the specified elements from the set, if present.

Parameters
`elements: Array<E>`	An array of elements to be removed from the set.

minusAssign

Cmn

operator fun minusAssign(elements: Iterable<E>): Unit

Removes the specified elements from the set, if present.

Parameters
`elements: Iterable<E>`	A Iterable of elements to be removed from the set.

minusAssign

Cmn

Added in 1.4.0

operator fun minusAssign(elements: ObjectList<E>): Unit

Removes the specified elements from the set, if present.

Parameters
`elements: ObjectList<E>`	An `ObjectList` whose elements should be removed from the set.

minusAssign

Cmn

Added in 1.4.0

operator fun minusAssign(elements: ScatterSet<E>): Unit

Removes the specified elements from the set, if present.

Parameters
`elements: ScatterSet<E>`	A `ScatterSet` whose elements should be removed from the set.

minusAssign

Cmn

operator fun minusAssign(elements: Sequence<E>): Unit

Removes the specified elements from the set, if present.

Parameters
`elements: Sequence<E>`	A sequence of elements to be removed from the set.

plusAssign

Cmn

Added in 1.4.0

operator fun plusAssign(element: E): Unit

Adds the specified element to the set.

Parameters
`element: E`	The element to add to the set.

plusAssign

Cmn

Added in 1.4.0

operator fun plusAssign(elements: Array<E>): Unit

Adds all the elements into this set.

Parameters
`elements: Array<E>`	An array of elements to add to the set.

plusAssign

Cmn

operator fun plusAssign(elements: Iterable<E>): Unit

Adds all the elements into this set.

Parameters
`elements: Iterable<E>`	Iterable elements to add to the set.

plusAssign

Cmn

Added in 1.4.0

operator fun plusAssign(elements: ObjectList<E>): Unit

Adds all the elements in the elements set into this set.

Parameters
`elements: ObjectList<E>`	An `ObjectList` whose elements are to be added to the set

plusAssign

Cmn

Added in 1.4.0

operator fun plusAssign(elements: ScatterSet<E>): Unit

Adds all the elements in the elements set into this set.

Parameters
`elements: ScatterSet<E>`	A `ScatterSet` whose elements are to be added to the set

plusAssign

Cmn

operator fun plusAssign(elements: Sequence<E>): Unit

Adds all the elements into this set.

Parameters
`elements: Sequence<E>`	The sequence of elements to add to the set.

remove

Cmn

Added in 1.4.0

fun remove(element: E): Boolean

Removes the specified element from the set.

Parameters
`element: E`	The element to be removed from the set.

Returns
`Boolean`	`true` if the `element` was present in the set, or `false` if it wasn't present before removal.

removeAll

Cmn

Added in 1.4.0

fun removeAll(elements: Array<E>): Boolean

Removes the specified elements from the set, if present.

Parameters
`elements: Array<E>`	An array of elements to be removed from the set.

Returns
`Boolean`	`true` if the set was changed or `false` if none of the elements were present.

removeAll

Cmn

fun removeAll(elements: Iterable<E>): Boolean

Removes the specified elements from the set, if present.

Parameters
`elements: Iterable<E>`	A Iterable of elements to be removed from the set.

Returns
`Boolean`	`true` if the set was changed or `false` if none of the elements were present.

removeAll

Cmn

Added in 1.4.0

fun removeAll(elements: ObjectList<E>): Boolean

Removes the specified elements from the set, if present.

Parameters
`elements: ObjectList<E>`	An `ObjectList` whose elements should be removed from the set.

Returns
`Boolean`	`true` if the set was changed or `false` if none of the elements were present.

removeAll

Cmn

Added in 1.4.0

fun removeAll(elements: ScatterSet<E>): Boolean

Removes the specified elements from the set, if present.

Parameters
`elements: ScatterSet<E>`	A `ScatterSet` whose elements should be removed from the set.

Returns
`Boolean`	`true` if the set was changed or `false` if none of the elements were present.

removeAll

Cmn

fun removeAll(elements: Sequence<E>): Boolean

Removes the specified elements from the set, if present.

Parameters
`elements: Sequence<E>`	A sequence of elements to be removed from the set.

Returns
`Boolean`	`true` if the set was changed or `false` if none of the elements were present.

removeIf

Cmn

Added in 1.4.0

inline fun removeIf(predicate: (E) -> Boolean): Unit

Removes any values for which the specified predicate returns true.

trim

Cmn

Added in 1.4.0

fun trim(): @IntRange(from = 0) Int

Trims this MutableScatterSet's storage so it is sized appropriately to hold the current elements.

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