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<?php
namespace Doctrine\Common\Collections;
use ArrayAccess;
use Closure;
use Countable;
use IteratorAggregate;
/**
* The missing (SPL) Collection/Array/OrderedMap interface.
*
* A Collection resembles the nature of a regular PHP array. That is,
* it is essentially an <b>ordered map</b> that can also be used
* like a list.
*
* A Collection has an internal iterator just like a PHP array. In addition,
* a Collection can be iterated with external iterators, which is preferable.
* To use an external iterator simply use the foreach language construct to
* iterate over the collection (which calls {@link getIterator()} internally) or
* explicitly retrieve an iterator though {@link getIterator()} which can then be
* used to iterate over the collection.
* You can not rely on the internal iterator of the collection being at a certain
* position unless you explicitly positioned it before. Prefer iteration with
* external iterators.
*/
interface Collection extends Countable, IteratorAggregate, ArrayAccess
{
/**
* Adds an element at the end of the collection.
*
* @param mixed $element The element to add.
*
* @return bool Always TRUE.
*/
public function add($element);
/**
* Clears the collection, removing all elements.
*
* @return void
*/
public function clear();
/**
* 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 $element The element to search for.
*
* @return bool TRUE if the collection contains the element, FALSE otherwise.
*/
public function contains($element);
/**
* Checks whether the collection is empty (contains no elements).
*
* @return bool TRUE if the collection is empty, FALSE otherwise.
*/
public function isEmpty();
/**
* Removes the element at the specified index from the collection.
*
* @param string|int $key The key/index of the element to remove.
*
* @return mixed The removed element or NULL, if the collection did not contain the element.
*/
public function remove($key);
/**
* Removes the specified element from the collection, if it is found.
*
* @param mixed $element The element to remove.
*
* @return bool TRUE if this collection contained the specified element, FALSE otherwise.
*/
public function removeElement($element);
/**
* Checks whether the collection contains an element with the specified key/index.
*
* @param string|int $key The key/index to check for.
*
* @return bool TRUE if the collection contains an element with the specified key/index,
* FALSE otherwise.
*/
public function containsKey($key);
/**
* Gets the element at the specified key/index.
*
* @param string|int $key The key/index of the element to retrieve.
*
* @return mixed
*/
public function get($key);
/**
* Gets all keys/indices of the collection.
*
* @return array The keys/indices of the collection, in the order of the corresponding
* elements in the collection.
*/
public function getKeys();
/**
* Gets all values of the collection.
*
* @return array The values of all elements in the collection, in the order they
* appear in the collection.
*/
public function getValues();
/**
* Sets an element in the collection at the specified key/index.
*
* @param string|int $key The key/index of the element to set.
* @param mixed $value The element to set.
*
* @return void
*/
public function set($key, $value);
/**
* Gets a native PHP array representation of the collection.
*
* @return array
*/
public function toArray();
/**
* Sets the internal iterator to the first element in the collection and returns this element.
*
* @return mixed
*/
public function first();
/**
* Sets the internal iterator to the last element in the collection and returns this element.
*
* @return mixed
*/
public function last();
/**
* Gets the key/index of the element at the current iterator position.
*
* @return int|string
*/
public function key();
/**
* Gets the element of the collection at the current iterator position.
*
* @return mixed
*/
public function current();
/**
* Moves the internal iterator position to the next element and returns this element.
*
* @return mixed
*/
public function next();
/**
* Tests for the existence of an element that satisfies the given predicate.
*
* @param Closure $p The predicate.
*
* @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.
*
* @return Collection A collection with the results of the filter operation.
*/
public function filter(Closure $p);
/**
* Tests whether the given predicate p holds for all elements of this collection.
*
* @param Closure $p The predicate.
*
* @return bool TRUE, if the predicate yields TRUE for all elements, FALSE otherwise.
*/
public function forAll(Closure $p);
/**
* Applies the given function to each element in the collection and returns
* a new collection with the elements returned by the function.
*
* @return Collection
*/
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.
*
* @return Collection[] 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.
*/
public function partition(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 $element The element to search for.
*
* @return int|string|bool The key/index of the element or FALSE if the element was not found.
*/
public function indexOf($element);
/**
* 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 $length The maximum number of elements to return, or null for no limit.
*
* @return array
*/
public function slice($offset, $length = null);
}