--- /dev/null
+<?php
+/*
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * This software consists of voluntary contributions made by many individuals
+ * and is licensed under the MIT license. For more information, see
+ * <http://www.doctrine-project.org>.
+ */
+
+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.
+ *
+ * @since 2.0
+ * @author Guilherme Blanco <guilhermeblanco@hotmail.com>
+ * @author Jonathan Wage <jonwage@gmail.com>
+ * @author Roman Borschel <roman@code-factory.org>
+ */
+interface Collection extends Countable, IteratorAggregate, ArrayAccess
+{
+ /**
+ * Adds an element at the end of the collection.
+ *
+ * @param mixed $element The element to add.
+ *
+ * @return boolean Always TRUE.
+ */
+ public function add($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 $element The element to search for.
+ *
+ * @return boolean TRUE if the collection contains the element, FALSE otherwise.
+ */
+ public function contains($element);
+
+ /**
+ * Checks whether the collection is empty (contains no elements).
+ *
+ * @return boolean TRUE if the collection is empty, FALSE otherwise.
+ */
+ public function isEmpty();
+
+ /**
+ * Removes the element at the specified index from the collection.
+ *
+ * @param string|integer $key The kex/index of the element to remove.
+ *
+ * @return mixed The removed element or NULL, if the collection did not contain the element.
+ */
+ public function remove($key);
+
+ /**
+ * Removes the specified element from the collection, if it is found.
+ *
+ * @param mixed $element The element to remove.
+ *
+ * @return boolean TRUE if this collection contained the specified element, FALSE otherwise.
+ */
+ public function removeElement($element);
+
+ /**
+ * Checks whether the collection contains an element with the specified key/index.
+ *
+ * @param string|integer $key The key/index to check for.
+ *
+ * @return boolean TRUE if the collection contains an element with the specified key/index,
+ * FALSE otherwise.
+ */
+ public function containsKey($key);
+
+ /**
+ * Gets the element at the specified key/index.
+ *
+ * @param string|integer $key The key/index of the element to retrieve.
+ *
+ * @return mixed
+ */
+ public function get($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|integer $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 boolean 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 boolean 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.
+ *
+ * @param Closure $func
+ *
+ * @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 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.
+ */
+ 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);
+}
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