ownerBaseFieldDefinitions example

$this->get($source_field_name)->getDataDefinition()->setConstraints($source_field_constraints);
    }

    return parent::validate();
  }

  /** * {@inheritdoc} */
  public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
    $fields = parent::baseFieldDefinitions($entity_type);
    $fields += static::ownerBaseFieldDefinitions($entity_type);

    $fields['name'] = BaseFieldDefinition::create('string')
      ->setLabel(t('Name'))
      ->setRequired(TRUE)
      ->setTranslatable(TRUE)
      ->setRevisionable(TRUE)
      ->setDefaultValue('')
      ->setSetting('max_length', 255)
      ->setDisplayOptions('form', [
        'type' => 'string_textfield',
        'weight' => -5,
      ])

class Workspace extends ContentEntityBase implements WorkspaceInterface {

  use EntityChangedTrait;
  use EntityOwnerTrait;

  /** * {@inheritdoc} */
  public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
    $fields = parent::baseFieldDefinitions($entity_type);
    $fields += static::ownerBaseFieldDefinitions($entity_type);

    $fields['id'] = BaseFieldDefinition::create('string')
      ->setLabel(new TranslatableMarkup('Workspace ID'))
      ->setDescription(new TranslatableMarkup('The workspace ID.'))
      ->setSetting('max_length', 128)
      ->setRequired(TRUE)
      ->addConstraint('UniqueField')
      ->addConstraint('DeletedWorkspace')
      ->addPropertyConstraints('value', ['Regex' => ['pattern' => '/^[a-z0-9_]+$/']]);

    $fields['label'] = BaseFieldDefinition::create('string')
      

$uri->setOption('fragment', 'comment-' . $this->id());
    return $uri;
  }

  /** * {@inheritdoc} */
  public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
    /** @var \Drupal\Core\Field\BaseFieldDefinition[] $fields */
    $fields = parent::baseFieldDefinitions($entity_type);
    $fields += static::publishedBaseFieldDefinitions($entity_type);
    $fields += static::ownerBaseFieldDefinitions($entity_type);

    $fields['cid']->setLabel(t('Comment ID'))
      ->setDescription(t('The comment ID.'));

    $fields['uuid']->setDescription(t('The comment UUID.'));

    $fields['comment_type']->setLabel(t('Comment Type'))
      ->setDescription(t('The comment type.'));

    $fields['langcode']->setDescription(t('The comment language code.'));

    

class ContentModerationState extends ContentEntityBase implements ContentModerationStateInterface {

  use EntityOwnerTrait;

  /** * {@inheritdoc} */
  public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
    $fields = parent::baseFieldDefinitions($entity_type);
    $fields += static::ownerBaseFieldDefinitions($entity_type);

    $fields['uid']
      ->setLabel(t('User'))
      ->setDescription(t('The username of the entity creator.'))
      ->setRevisionable(TRUE);

    $fields['workflow'] = BaseFieldDefinition::create('entity_reference')
      ->setLabel(t('Workflow'))
      ->setDescription(t('The workflow the moderation state is in.'))
      ->setSetting('target_type', 'workflow')
      ->setRequired(TRUE)
      

// Ignore and continue.       }
    }
  }

  /** * {@inheritdoc} */
  public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
    /** @var \Drupal\Core\Field\BaseFieldDefinition[] $fields */
    $fields = parent::baseFieldDefinitions($entity_type);
    $fields += static::ownerBaseFieldDefinitions($entity_type);

    $fields['fid']->setLabel(t('File ID'))
      ->setDescription(t('The file ID.'));

    $fields['uuid']->setDescription(t('The file UUID.'));

    $fields['langcode']->setLabel(t('Language code'))
      ->setDescription(t('The file language code.'));

    $fields['uid']
      ->setDescription(t('The user ID of the file.'));

    

  public function setSticky($sticky) {
    $this->set('sticky', $sticky ? NodeInterface::STICKY : NodeInterface::NOT_STICKY);
    return $this;
  }

  /** * {@inheritdoc} */
  public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
    $fields = parent::baseFieldDefinitions($entity_type);
    $fields += static::ownerBaseFieldDefinitions($entity_type);

    $fields['title'] = BaseFieldDefinition::create('string')
      ->setLabel(t('Title'))
      ->setRequired(TRUE)
      ->setTranslatable(TRUE)
      ->setRevisionable(TRUE)
      ->setSetting('max_length', 255)
      ->setDisplayOptions('view', [
        'label' => 'hidden',
        'type' => 'string',
        'weight' => -5,
      ])