. */ namespace Doctrine\Common\Collections; use Closure, Countable, IteratorAggregate, ArrayAccess; /** * The missing (SPL) Collection/Array/OrderedMap interface. * * A Collection resembles the nature of a regular PHP array. That is, * it is essentially an ordered map 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 preferrable. * 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. * * @license http://www.opensource.org/licenses/lgpl-license.php LGPL * @link www.doctrine-project.org * @since 2.0 * @version $Revision: 3938 $ * @author Guilherme Blanco * @author Jonathan Wage * @author Roman Borschel */ interface Collection extends Countable, IteratorAggregate, ArrayAccess { /** * Adds an element at the end of the collection. * * @param mixed $element The element to add. * @return boolean Always TRUE. */ function add($element); /** * Clears the collection, removing all elements. */ 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 $element The element to search for. * @return boolean TRUE if the collection contains the element, FALSE otherwise. */ function contains($element); /** * Checks whether the collection is empty (contains no elements). * * @return boolean TRUE if the collection is empty, FALSE otherwise. */ function isEmpty(); /** * Removes the element at the specified index from the collection. * * @param string|integer $key The kex/index of the element to remove. * @return mixed The removed element or NULL, if the collection did not contain the element. */ function remove($key); /** * Removes an element from the collection. * * @param mixed $element The element to remove. * @return mixed The removed element or NULL, if the collection did not contain the element. */ function removeElement($element); /** * Checks whether the collection contains an element with the specified key/index. * * @param string|integer $key The key/index to check for. * @return boolean TRUE if the collection contains an element with the specified key/index, * FALSE otherwise. */ function containsKey($key); /** * Gets the element at the specified key/index. * * @param string|integer $key The key/index of the element to retrieve. * @return mixed */ function get($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. */ 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. */ function getValues(); /** * Sets an element in the collection at the specified key/index. * * @param string|integer $key The key/index of the element to set. * @param mixed $value The element to set. */ function set($key, $value); /** * Gets a native PHP array representation of the collection. * * @return array */ function toArray(); /** * Sets the internal iterator to the first element in the collection and * returns this element. * * @return mixed */ function first(); /** * Sets the internal iterator to the last element in the collection and * returns this element. * * @return mixed */ function last(); /** * Gets the key/index of the element at the current iterator position. * */ function key(); /** * Gets the element of the collection at the current iterator position. * */ function current(); /** * Moves the internal iterator position to the next element. * */ function next(); /** * Tests for the existence of an element that satisfies the given predicate. * * @param Closure $p The predicate. * @return boolean TRUE if the predicate is TRUE for at least one element, FALSE otherwise. */ 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. */ function filter(Closure $p); /** * Applies the given predicate p to all elements of this collection, * returning true, if the predicate yields true for all elements. * * @param Closure $p The predicate. * @return boolean TRUE, if the predicate yields TRUE for all elements, FALSE otherwise. */ 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. * * @param Closure $func * @return Collection */ 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 array 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. */ 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 $element The element to search for. * @return mixed The key/index of the element or FALSE if the element was not found. */ function indexOf($element); }