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<?php
declare(strict_types=1);
namespace Doctrine\Common\Collections;
use Closure;
use Countable;
use IteratorAggregate;
/**
* @psalm-template TKey of array-key
* @template-covariant T
* @template-extends IteratorAggregate<TKey, T>
*/
interface ReadableCollection extends Countable, IteratorAggregate
{
/**
* Checks whether an element is contained in the collection.
* This is an O(n) operation, where n is the size of the collection.
*
* @param mixed $element The element to search for.
* @psalm-param TMaybeContained $element
*
* @return bool TRUE if the collection contains the element, FALSE otherwise.
* @psalm-return (TMaybeContained is T ? bool : false)
*
* @template TMaybeContained
*/
public function contains(mixed $element);
/**
* Checks whether the collection is empty (contains no elements).
*
* @return bool TRUE if the collection is empty, FALSE otherwise.
*/
public function isEmpty();
/**
* Checks whether the collection contains an element with the specified key/index.
*
* @param string|int $key The key/index to check for.
* @psalm-param TKey $key
*
* @return bool TRUE if the collection contains an element with the specified key/index,
* FALSE otherwise.
*/
public function containsKey(string|int $key);
/**
* Gets the element at the specified key/index.
*
* @param string|int $key The key/index of the element to retrieve.
* @psalm-param TKey $key
*
* @return mixed
* @psalm-return T|null
*/
public function get(string|int $key);
/**
* Gets all keys/indices of the collection.
*
* @return int[]|string[] The keys/indices of the collection, in the order of the corresponding
* elements in the collection.
* @psalm-return list<TKey>
*/
public function getKeys();
/**
* Gets all values of the collection.
*
* @return mixed[] The values of all elements in the collection, in the
* order they appear in the collection.
* @psalm-return list<T>
*/
public function getValues();
/**
* Gets a native PHP array representation of the collection.
*
* @return mixed[]
* @psalm-return array<TKey,T>
*/
public function toArray();
/**
* Sets the internal iterator to the first element in the collection and returns this element.
*
* @return mixed
* @psalm-return T|false
*/
public function first();
/**
* Sets the internal iterator to the last element in the collection and returns this element.
*
* @return mixed
* @psalm-return T|false
*/
public function last();
/**
* Gets the key/index of the element at the current iterator position.
*
* @return int|string|null
* @psalm-return TKey|null
*/
public function key();
/**
* Gets the element of the collection at the current iterator position.
*
* @return mixed
* @psalm-return T|false
*/
public function current();
/**
* Moves the internal iterator position to the next element and returns this element.
*
* @return mixed
* @psalm-return T|false
*/
public function next();
/**
* Extracts a slice of $length elements starting at position $offset from the Collection.
*
* If $length is null it returns all elements from $offset to the end of the Collection.
* Keys have to be preserved by this method. Calling this method will only return the
* selected slice and NOT change the elements contained in the collection slice is called on.
*
* @param int $offset The offset to start from.
* @param int|null $length The maximum number of elements to return, or null for no limit.
*
* @return mixed[]
* @psalm-return array<TKey,T>
*/
public function slice(int $offset, int|null $length = null);
/**
* Tests for the existence of an element that satisfies the given predicate.
*
* @param Closure $p The predicate.
* @psalm-param Closure(TKey, T):bool $p
*
* @return bool TRUE if the predicate is TRUE for at least one element, FALSE otherwise.
*/
public function exists(Closure $p);
/**
* Returns all the elements of this collection that satisfy the predicate p.
* The order of the elements is preserved.
*
* @param Closure $p The predicate used for filtering.
* @psalm-param Closure(T, TKey):bool $p
*
* @return ReadableCollection<mixed> A collection with the results of the filter operation.
* @psalm-return ReadableCollection<TKey, T>
*/
public function filter(Closure $p);
/**
* Applies the given function to each element in the collection and returns
* a new collection with the elements returned by the function.
*
* @psalm-param Closure(T):U $func
*
* @return ReadableCollection<mixed>
* @psalm-return ReadableCollection<TKey, U>
*
* @psalm-template U
*/
public function map(Closure $func);
/**
* Partitions this collection in two collections according to a predicate.
* Keys are preserved in the resulting collections.
*
* @param Closure $p The predicate on which to partition.
* @psalm-param Closure(TKey, T):bool $p
*
* @return ReadableCollection<mixed>[] An array with two elements. The first element contains the collection
* of elements where the predicate returned TRUE, the second element
* contains the collection of elements where the predicate returned FALSE.
* @psalm-return array{0: ReadableCollection<TKey, T>, 1: ReadableCollection<TKey, T>}
*/
public function partition(Closure $p);
/**
* Tests whether the given predicate p holds for all elements of this collection.
*
* @param Closure $p The predicate.
* @psalm-param Closure(TKey, T):bool $p
*
* @return bool TRUE, if the predicate yields TRUE for all elements, FALSE otherwise.
*/
public function forAll(Closure $p);
/**
* Gets the index/key of a given element. The comparison of two elements is strict,
* that means not only the value but also the type must match.
* For objects this means reference equality.
*
* @param mixed $element The element to search for.
* @psalm-param TMaybeContained $element
*
* @return int|string|bool The key/index of the element or FALSE if the element was not found.
* @psalm-return (TMaybeContained is T ? TKey|false : false)
*
* @template TMaybeContained
*/
public function indexOf(mixed $element);
/**
* Returns the first element of this collection that satisfies the predicate p.
*
* @param Closure $p The predicate.
* @psalm-param Closure(TKey, T):bool $p
*
* @return mixed The first element respecting the predicate,
* null if no element respects the predicate.
* @psalm-return T|null
*/
public function findFirst(Closure $p);
/**
* Applies iteratively the given function to each element in the collection,
* so as to reduce the collection to a single value.
*
* @psalm-param Closure(TReturn|TInitial|null, T):(TInitial|TReturn) $func
* @psalm-param TInitial|null $initial
*
* @return mixed
* @psalm-return TReturn|TInitial|null
*
* @psalm-template TReturn
* @psalm-template TInitial
*/
public function reduce(Closure $func, mixed $initial = null);
}
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