--- /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\Persistence;
+
+/**
+ * Contract for a Doctrine persistence layer ObjectRepository class to implement.
+ *
+ * @link www.doctrine-project.org
+ * @since 2.1
+ * @author Benjamin Eberlei <kontakt@beberlei.de>
+ * @author Jonathan Wage <jonwage@gmail.com>
+ */
+interface ObjectRepository
+{
+ /**
+ * Finds an object by its primary key / identifier.
+ *
+ * @param mixed $id The identifier.
+ *
+ * @return object|null The object.
+ */
+ public function find($id);
+
+ /**
+ * Finds all objects in the repository.
+ *
+ * @return array The objects.
+ */
+ public function findAll();
+
+ /**
+ * Finds objects by a set of criteria.
+ *
+ * Optionally sorting and limiting details can be passed. An implementation may throw
+ * an UnexpectedValueException if certain values of the sorting or limiting details are
+ * not supported.
+ *
+ * @param array $criteria
+ * @param array|null $orderBy
+ * @param int|null $limit
+ * @param int|null $offset
+ *
+ * @return array The objects.
+ *
+ * @throws \UnexpectedValueException
+ */
+ public function findBy(array $criteria, array $orderBy = null, $limit = null, $offset = null);
+
+ /**
+ * Finds a single object by a set of criteria.
+ *
+ * @param array $criteria The criteria.
+ *
+ * @return object|null The object.
+ */
+ public function findOneBy(array $criteria);
+
+ /**
+ * Returns the class name of the object managed by the repository.
+ *
+ * @return string
+ */
+ public function getClassName();
+}