Chris@0: <?php
Chris@0: 
Chris@0: namespace Drupal\user;
Chris@0: 
Chris@14: use Drupal\Core\Field\FieldDefinitionInterface;
Chris@0: use Drupal\Core\Field\Plugin\Field\FieldType\StringItem;
Chris@0: 
Chris@0: /**
Chris@0:  * Defines a custom field item class for the 'name' user entity field.
Chris@0:  */
Chris@0: class UserNameItem extends StringItem {
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   public function isEmpty() {
Chris@0:     $value = $this->get('value')->getValue();
Chris@0: 
Chris@0:     // Take into account that the name of the anonymous user is an empty string.
Chris@0:     if ($this->getEntity()->isAnonymous()) {
Chris@0:       return $value === NULL;
Chris@0:     }
Chris@0: 
Chris@0:     return $value === NULL || $value === '';
Chris@0:   }
Chris@0: 
Chris@14:   /**
Chris@14:    * {@inheritdoc}
Chris@14:    */
Chris@14:   public static function generateSampleValue(FieldDefinitionInterface $field_definition) {
Chris@14:     $values = parent::generateSampleValue($field_definition);
Chris@14:     // User names larger than 60 characters won't pass validation.
Chris@14:     $values['value'] = substr($values['value'], 0, UserInterface::USERNAME_MAX_LENGTH);
Chris@14:     return $values;
Chris@14:   }
Chris@14: 
Chris@0: }