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<?php
/**
* This file is part of the ramsey/collection library
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*
* @copyright Copyright (c) Ben Ramsey <ben@benramsey.com>
* @license http://opensource.org/licenses/MIT MIT
*/
declare(strict_types=1);
namespace Ramsey\Collection;
use Ramsey\Collection\Exception\CollectionMismatchException;
use Ramsey\Collection\Exception\InvalidArgumentException;
use Ramsey\Collection\Exception\InvalidPropertyOrMethod;
use Ramsey\Collection\Exception\NoSuchElementException;
use Ramsey\Collection\Exception\UnsupportedOperationException;
/**
* A collection represents a group of values, known as its elements.
*
* Some collections allow duplicate elements and others do not. Some are ordered
* and others unordered.
*
* @template T
* @extends ArrayInterface<T>
*/
interface CollectionInterface extends ArrayInterface
{
/**
* Ensures that this collection contains the specified element (optional
* operation).
*
* Returns `true` if this collection changed as a result of the call.
* (Returns `false` if this collection does not permit duplicates and
* already contains the specified element.)
*
* Collections that support this operation may place limitations on what
* elements may be added to this collection. In particular, some
* collections will refuse to add `null` elements, and others will impose
* restrictions on the type of elements that may be added. Collection
* classes should clearly specify in their documentation any restrictions
* on what elements may be added.
*
* If a collection refuses to add a particular element for any reason other
* than that it already contains the element, it must throw an exception
* (rather than returning `false`). This preserves the invariant that a
* collection always contains the specified element after this call returns.
*
* @param T $element The element to add to the collection.
*
* @return bool `true` if this collection changed as a result of the call.
*
* @throws InvalidArgumentException if the collection refuses to add the
* $element for any reason other than that it already contains the element.
*/
public function add(mixed $element): bool;
/**
* Returns `true` if this collection contains the specified element.
*
* @param T $element The element to check whether the collection contains.
* @param bool $strict Whether to perform a strict type check on the value.
*/
public function contains(mixed $element, bool $strict = true): bool;
/**
* Returns the type associated with this collection.
*/
public function getType(): string;
/**
* Removes a single instance of the specified element from this collection,
* if it is present.
*
* @param T $element The element to remove from the collection.
*
* @return bool `true` if an element was removed as a result of this call.
*/
public function remove(mixed $element): bool;
/**
* Returns the values from the given property, method, or array key.
*
* @param string $propertyOrMethod The name of the property, method, or
* array key to evaluate and return.
*
* @return list<mixed>
*
* @throws InvalidPropertyOrMethod if the $propertyOrMethod does not exist
* on the elements in this collection.
* @throws UnsupportedOperationException if unable to call column() on this
* collection.
*/
public function column(string $propertyOrMethod): array;
/**
* Returns the first item of the collection.
*
* @return T
*
* @throws NoSuchElementException if this collection is empty.
*/
public function first(): mixed;
/**
* Returns the last item of the collection.
*
* @return T
*
* @throws NoSuchElementException if this collection is empty.
*/
public function last(): mixed;
/**
* Sort the collection by a property, method, or array key with the given
* sort order.
*
* If $propertyOrMethod is `null`, this will sort by comparing each element.
*
* This will always leave the original collection untouched and will return
* a new one.
*
* @param string | null $propertyOrMethod The property, method, or array key
* to sort by.
* @param Sort $order The sort order for the resulting collection.
*
* @return CollectionInterface<T>
*
* @throws InvalidPropertyOrMethod if the $propertyOrMethod does not exist
* on the elements in this collection.
* @throws UnsupportedOperationException if unable to call sort() on this
* collection.
*/
public function sort(?string $propertyOrMethod = null, Sort $order = Sort::Ascending): self;
/**
* Filter out items of the collection which don't match the criteria of
* given callback.
*
* This will always leave the original collection untouched and will return
* a new one.
*
* See the {@link http://php.net/manual/en/function.array-filter.php PHP array_filter() documentation}
* for examples of how the `$callback` parameter works.
*
* @param callable(T): bool $callback A callable to use for filtering elements.
*
* @return CollectionInterface<T>
*/
public function filter(callable $callback): self;
/**
* Create a new collection where the result of the given property, method,
* or array key of each item in the collection equals the given value.
*
* This will always leave the original collection untouched and will return
* a new one.
*
* @param string | null $propertyOrMethod The property, method, or array key
* to evaluate. If `null`, the element itself is compared to $value.
* @param mixed $value The value to match.
*
* @return CollectionInterface<T>
*
* @throws InvalidPropertyOrMethod if the $propertyOrMethod does not exist
* on the elements in this collection.
* @throws UnsupportedOperationException if unable to call where() on this
* collection.
*/
public function where(?string $propertyOrMethod, mixed $value): self;
/**
* Apply a given callback method on each item of the collection.
*
* This will always leave the original collection untouched. The new
* collection is created by mapping the callback to each item of the
* original collection.
*
* See the {@link http://php.net/manual/en/function.array-map.php PHP array_map() documentation}
* for examples of how the `$callback` parameter works.
*
* @param callable(T): TCallbackReturn $callback A callable to apply to each
* item of the collection.
*
* @return CollectionInterface<TCallbackReturn>
*
* @template TCallbackReturn
*/
public function map(callable $callback): self;
/**
* Apply a given callback method on each item of the collection
* to reduce it to a single value.
*
* See the {@link http://php.net/manual/en/function.array-reduce.php PHP array_reduce() documentation}
* for examples of how the `$callback` and `$initial` parameters work.
*
* @param callable(TCarry, T): TCarry $callback A callable to apply to each
* item of the collection to reduce it to a single value.
* @param TCarry $initial This is the initial value provided to the callback.
*
* @return TCarry
*
* @template TCarry
*/
public function reduce(callable $callback, mixed $initial): mixed;
/**
* Create a new collection with divergent items between current and given
* collection.
*
* @param CollectionInterface<T> $other The collection to check for divergent
* items.
*
* @return CollectionInterface<T>
*
* @throws CollectionMismatchException if the compared collections are of
* differing types.
*/
public function diff(CollectionInterface $other): self;
/**
* Create a new collection with intersecting item between current and given
* collection.
*
* @param CollectionInterface<T> $other The collection to check for
* intersecting items.
*
* @return CollectionInterface<T>
*
* @throws CollectionMismatchException if the compared collections are of
* differing types.
*/
public function intersect(CollectionInterface $other): self;
/**
* Merge current items and items of given collections into a new one.
*
* @param CollectionInterface<T> ...$collections The collections to merge.
*
* @return CollectionInterface<T>
*
* @throws CollectionMismatchException if unable to merge any of the given
* collections or items within the given collections due to type
* mismatch errors.
*/
public function merge(CollectionInterface ...$collections): self;
}