Added constraints for selectable attribute.

src/Validator/Constraints/NoneOfItsChildrenValidator.php

@@ -37,6 +37,7 @@ use Symfony\Bundle\MakerBundle\Str;
 use Symfony\Component\Form\Exception\UnexpectedTypeException;
 use Symfony\Component\Validator\Constraint;
 use Symfony\Component\Validator\ConstraintValidator;
+use Symfony\Component\Validator\Exception\UnexpectedValueException;
 
 /**
  * The validator for the NoneOfItsChildren annotation.
@@ -62,6 +63,11 @@ class NoneOfItsChildrenValidator extends ConstraintValidator
             return;
         }
 
+        //Check type of value. Validating only works for StructuralDBElements
+        if (!$value instanceof StructuralDBElement) {
+            throw new UnexpectedValueException($value, 'StructuralDBElement');
+        }
+
         //Check if the object is assigned to itself
         /** @var StructuralDBElement $entity */
         $entity = $this->context->getObject();

src/Validator/Constraints/Selectable.php

@@ -0,0 +1,47 @@
+<?php
+/**
+ *
+ * part-db version 0.1
+ * Copyright (C) 2005 Christoph Lechner
+ * http://www.cl-projects.de/
+ *
+ * part-db version 0.2+
+ * Copyright (C) 2009 K. Jacobs and others (see authors.php)
+ * http://code.google.com/p/part-db/
+ *
+ * Part-DB Version 0.4+
+ * Copyright (C) 2016 - 2019 Jan Böhmer
+ * https://github.com/jbtronics
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ *
+ */
+
+namespace App\Validator\Constraints;
+
+
+use Symfony\Component\Validator\Constraint;
+
+/**
+ * If a property is marked with this constraint, the choosen value (of type StructuralDBElement)
+ * must NOT be marked as not selectable.
+ *
+ * @package App\Validator\Constraints
+ * @Annotation
+ */
+class Selectable extends Constraint
+{
+    public $message = 'validator.isSelectable';
+}

src/Validator/Constraints/SelectableValidator.php

@@ -0,0 +1,78 @@
+<?php
+/**
+ *
+ * part-db version 0.1
+ * Copyright (C) 2005 Christoph Lechner
+ * http://www.cl-projects.de/
+ *
+ * part-db version 0.2+
+ * Copyright (C) 2009 K. Jacobs and others (see authors.php)
+ * http://code.google.com/p/part-db/
+ *
+ * Part-DB Version 0.4+
+ * Copyright (C) 2016 - 2019 Jan Böhmer
+ * https://github.com/jbtronics
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ *
+ */
+
+namespace App\Validator\Constraints;
+
+use App\Entity\Base\StructuralDBElement;
+use Symfony\Component\Form\Exception\UnexpectedTypeException;
+use Symfony\Component\Validator\Constraint;
+use Symfony\Component\Validator\ConstraintValidator;
+use Symfony\Component\Validator\Exception\UnexpectedValueException;
+
+/**
+ * The validator for the Selectable constraint.
+ * @package App\Validator\Constraints
+ */
+class SelectableValidator extends ConstraintValidator
+{
+
+    /**
+     * Checks if the passed value is valid.
+     *
+     * @param mixed $value The value that should be validated
+     * @param \Symfony\Component\Validator\Constraint $constraint The constraint for the validation
+     */
+    public function validate($value, Constraint $constraint)
+    {
+        if (!$constraint instanceof Selectable) {
+            throw new UnexpectedTypeException($constraint, Selectable::class);
+        }
+
+        // custom constraints should ignore null and empty values to allow
+        // other constraints (NotBlank, NotNull, etc.) take care of that
+        if (null === $value || '' === $value) {
+            return;
+        }
+
+        //Check type of value. Validating only works for StructuralDBElements
+        if (!$value instanceof StructuralDBElement) {
+            throw new UnexpectedValueException($value, 'StructuralDBElement');
+        }
+
+        //Check if the value is not selectable -> show error message then.
+        if ($value->isNotSelectable()) {
+            $this->context->buildViolation($constraint->message)
+                ->setParameter('{{ name }}', $value->getName())
+                ->setParameter('{{ full_path }}', $value->getFullPath())
+                ->addViolation();
+        }
+    }
+}