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+<?php
+/**
+ * ownCloud - News
+ *
+ * This file is licensed under the Affero General Public License version 3 or
+ * later. See the COPYING file.
+ *
+ * @author Alessandro Cosentino <cosenal@gmail.com>
+ * @author Bernhard Posselt <dev@bernhard-posselt.com>
+ * @copyright Alessandro Cosentino 2012
+ * @copyright Bernhard Posselt 2012, 2014
+ */
+
+namespace OCA\News\Service;
+
+use \OCP\AppFramework\Db\DoesNotExistException;
+use \OCP\AppFramework\Db\MultipleObjectsReturnedException;
+
+use \OCA\News\Db\IMapper;
+
+
+abstract class Service {
+
+	protected $mapper;
+
+	public function __construct(IMapper $mapper){
+		$this->mapper = $mapper;
+	}
+
+
+	/**
+	 * Delete an entity
+	 * @param int $id the id of the entity
+	 * @param string $userId the name of the user for security reasons
+	 * @throws DoesNotExistException if the entity does not exist
+	 * @throws MultipleObjectsReturnedException if more than one entity exists
+	 */
+	public function delete($id, $userId){
+		$entity = $this->find($id, $userId);
+		$this->mapper->delete($entity);
+	}
+
+
+	/**
+	 * Finds an entity by id
+	 * @param int $id the id of the entity
+	 * @param string $userId the name of the user for security reasons
+	 * @throws DoesNotExistException if the entity does not exist
+	 * @throws MultipleObjectsReturnedException if more than one entity exists
+	 * @return Entity the entity
+	 */
+	public function find($id, $userId){
+		try {
+			return $this->mapper->find($id, $userId);
+		} catch(DoesNotExistException $ex){
+			throw new ServiceNotFoundException($ex->getMessage());
+		} catch(MultipleObjectsReturnedException $ex){
+			throw new ServiceNotFoundException($ex->getMessage());
+		}
+	}
+
+}