rewrite interface and create first tests

Export/ModifierInterface.php

@@ -0,0 +1,58 @@
+<?php
+
+/*
+ * Copyright (C) 2016 Champs-Libres <info@champs-libres.coop>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+namespace Chill\MainBundle\Export;
+
+use Doctrine\ORM\QueryBuilder;
+
+/**
+ * Modifiers modify the export's query.
+ * 
+ * Known subclasses : AggregatorInterface and FilterInterface
+ *
+ * @author Julien Fastré <julien.fastre@champs-libres.coop>
+ */
+interface ModifierInterface extends ExportElementInterface
+{
+    /**
+     * The role required for executing this Modifier
+     * 
+     * If null, will used the ExportInterface::requiredRole role from
+     * the current executing export.
+     * 
+     * @return NULL|\Symfony\Component\Security\Core\Role\Role A role required to execute this ModifiersInterface
+     */
+    public function addRole();
+    
+    /**
+     * On which type of Export this ModifiersInterface may apply.
+     * 
+     * @return string the type on which the Modifiers apply
+     */
+    public function applyOn();
+    
+    /**
+     * Alter the query initiated by the export, to add the required statements 
+     * (`GROUP BY`, `SELECT`, `WHERE`)
+     * 
+     * @param QueryBuilder $qb the QueryBuilder initiated by the Export (and eventually modified by other Modifiers)
+     * @param mixed[] $data the data from the Form (builded by buildForm)
+     */
+    public function alterQuery(QueryBuilder $qb, $data);
+}