Add Ephoto Dam Field Constraint

modules/ephoto_dam_field/src/Plugin/Field/FieldType/EphotoDamField.php

@@ -17,7 +17,8 @@ use Drupal\Core\TypedData\TraversableTypedDataInterface;
  *   description = @Translation("Stores a Ephoto Dam URL and then outputs some embed code"),
  *   category = @Translation("Media"),
  *   default_widget = "ephoto_dam_field_widget",
- *   default_formatter = "ephoto_dam_field_formatter"
+ *   default_formatter = "ephoto_dam_field_formatter",
+ *   constraints = {"EphotoDamFieldValidation" = {}} 
  * )
  */
 class EphotoDamField extends FieldItemBase {
@@ -64,15 +65,12 @@ class EphotoDamField extends FieldItemBase {
     public static function propertyDefinitions(FieldStorageDefinitionInterface $field_definition) {
         $properties['url'] = DataDefinition::create('string')
             ->setLabel(t('Url'));
-            //->setRequired(true);
 
         $properties['image_size'] = DataDefinition::create('string')
             ->setLabel(t('Image size'));
-            //->setRequired(true);
 
         $properties['version'] = DataDefinition::create('string')
             ->setLabel(t('Version'));
-            //->setRequired(true);
         
         return $properties;
     }

modules/ephoto_dam_field/src/Plugin/Validation/Constraint/EphotoDamFieldConstraint.php

+<?php
+
+namespace Drupal\ephoto_dam_field\Plugin\Validation\Constraint;
+
+use Symfony\Component\Validator\Constraint;
+
+/**
+ * Validation constraint for the ephoto dam field.
+ *
+ * @Constraint(
+ *   id = "EphotoDamFieldValidation"
+ * )
+ */
+class EphotoDamFieldConstraint extends Constraint {
+
+}

modules/ephoto_dam_field/src/Plugin/Validation/Constraint/EphotoDamFieldConstraintValidator.php

+<?php
+
+namespace Drupal\ephoto_dam_field\Plugin\Validation\Constraint;
+
+use Drupal\Core\DependencyInjection\ContainerInjectionInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+use Symfony\Component\Validator\Constraint;
+use Symfony\Component\Validator\ConstraintValidator;
+
+/**
+ * Validates the Ephoto Dam Field
+ */
+class EphotoDamFieldConstraintValidator extends ConstraintValidator implements ContainerInjectionInterface {
+    /**
+     * Create an instance of the validator.
+     */
+    public function __construct() {
+    
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public static function create(ContainerInterface $container) {
+        return new static();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function validate($field, Constraint $constraint) {
+        if (!isset($field->image_size)) {
+            return NULL;
+        }
+
+        error_log(var_export($field->image_size, true));
+
+        //$this->context->addViolation('');
+    }
+}