add api to add a validation on export elements

Exports elements should implements "ExportElementValidatedInterface"

Validator/Constraints/Export/ExportElementConstraint.php

@@ -0,0 +1,47 @@
+<?php
+/*
+ * Copyright (C) 2017 Champs Libres Cooperative <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\Validator\Constraints\Export;
+
+use Symfony\Component\Validator\Constraint;
+
+/**
+ * Constraint which will check the ExportElement. 
+ *
+ * @see ExportElementConstraintValidator
+ * @author Julien Fastré <julien.fastre@champs-libres.coop>
+ */
+class ExportElementConstraint extends Constraint
+{
+    public $element;
+
+
+    public function validatedBy()
+    {
+        return ExportElementConstraintValidator::class;
+    }
+    
+    public function getRequiredOptions()
+    {
+        return array('element');
+    }
+    
+    public function getTargets()
+    {
+        return self::PROPERTY_CONSTRAINT;
+    }
+}

Validator/Constraints/Export/ExportElementConstraintValidator.php

@@ -0,0 +1,40 @@
+<?php
+/*
+ * Copyright (C) 2017 Champs Libres Cooperative <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\Validator\Constraints\Export;
+
+use Symfony\Component\Validator\Constraint;
+use Symfony\Component\Validator\ConstraintValidator;
+use Chill\MainBundle\Export\ExportElementValidatedInterface;
+
+/**
+ * This validator validate the _export element_ if this element implements
+ * {@link ExportElementValidatedInterface}. 
+ *
+ * @author Julien Fastré <julien.fastre@champs-libres.coop>
+ */
+class ExportElementConstraintValidator extends ConstraintValidator
+{
+    public function validate($value, Constraint $constraint)
+    {        
+        if ($constraint->element instanceof ExportElementValidatedInterface) {
+            if ($value["enabled"] === true) {
+                $constraint->element->validateForm($value["form"], $this->context);
+            } 
+        }
+    }
+}