class EntityTest

class EntityTest extends ContentEntityBase implements EntityOwnerInterface {
    
    /**
     * {@inheritdoc}
     */
    public static function preCreate(EntityStorageInterface $storage, array &$values) {
        parent::preCreate($storage, $values);
        if (empty($values['type'])) {
            $values['type'] = $storage->getEntityTypeId();
        }
    }
    
    /**
     * {@inheritdoc}
     */
    public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
        $fields = parent::baseFieldDefinitions($entity_type);
        $fields['name'] = BaseFieldDefinition::create('string')->setLabel(t('Name'))
            ->setDescription(t('The name of the test entity.'))
            ->setTranslatable(TRUE)
            ->setSetting('max_length', 32)
            ->setDisplayOptions('view', [
            'label' => 'hidden',
            'type' => 'string',
            'weight' => -5,
        ])
            ->setDisplayOptions('form', [
            'type' => 'string_textfield',
            'weight' => -5,
        ]);
        $fields['created'] = BaseFieldDefinition::create('created')->setLabel(t('Authored on'))
            ->setDescription(t('Time the entity was created'))
            ->setTranslatable(TRUE);
        $fields['user_id'] = BaseFieldDefinition::create('entity_reference')->setLabel(t('User ID'))
            ->setDescription(t('The ID of the associated user.'))
            ->setSetting('target_type', 'user')
            ->setSetting('handler', 'default')
            ->setDefaultValue([
            0 => [
                'target_id' => 1,
            ],
        ])
            ->setTranslatable(TRUE)
            ->setDisplayOptions('form', [
            'type' => 'entity_reference_autocomplete',
            'weight' => -1,
            'settings' => [
                'match_operator' => 'CONTAINS',
                'size' => '60',
                'placeholder' => '',
            ],
        ]);
        return $fields + \Drupal::state()->get($entity_type->id() . '.additional_base_field_definitions', []);
    }
    
    /**
     * {@inheritdoc}
     */
    public function getOwner() {
        return $this->get('user_id')->entity;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getOwnerId() {
        return $this->get('user_id')->target_id;
    }
    
    /**
     * {@inheritdoc}
     */
    public function setOwnerId($uid) {
        $this->set('user_id', $uid);
        return $this;
    }
    
    /**
     * {@inheritdoc}
     */
    public function setOwner(UserInterface $account) {
        $this->set('user_id', $account->id());
        return $this;
    }
    
    /**
     * Sets the name.
     *
     * @param string $name
     *   Name of the entity.
     *
     * @return $this
     */
    public function setName($name) {
        $this->set('name', $name);
        return $this;
    }
    
    /**
     * Returns the name.
     *
     * @return string
     */
    public function getName() {
        return $this->get('name')->value;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getEntityKey($key) {
        // Typically this protected method is used internally by entity classes and
        // exposed publicly through more specific getter methods. So that test cases
        // are able to set and access entity keys dynamically, update the visibility
        // of this method to public.
        return parent::getEntityKey($key);
    }

}