class ConfigTest

class ConfigTest extends ConfigEntityBase implements ConfigTestInterface {

  /**
   * The machine name for the configuration entity.
   *
   * @var string
   */
  protected $id;

  /**
   * The human-readable name of the configuration entity.
   *
   * @var string
   */
  public $label;

  /**
   * The weight of the configuration entity.
   *
   * @var int
   */
  public $weight = 0;

  /**
   * The image style to use.
   *
   * @var string
   */
  public $style;

  /**
   * A protected property of the configuration entity.
   *
   * @var string
   */
  protected $protected_property;

  /**
   * {@inheritdoc}
   */
  public static function sort(ConfigEntityInterface $a, ConfigEntityInterface $b) {
    \Drupal::state()
      ->set('config_entity_sort', TRUE);
    return parent::sort($a, $b);
  }

  /**
   * {@inheritdoc}
   */
  public function postSave(EntityStorageInterface $storage, $update = TRUE) {

    // Used to test secondary writes during config sync.
    if ($this
      ->id() == 'primary') {
      $secondary = $storage
        ->create([
        'id' => 'secondary',
        'label' => 'Secondary Default',
      ]);
      $secondary
        ->save();
    }
    if ($this
      ->id() == 'dependency') {
      $dependent = $storage
        ->load('dependent');
      $dependent
        ->delete();
    }
  }

  /**
   * {@inheritdoc}
   */
  public static function postDelete(EntityStorageInterface $storage, array $entities) {
    parent::postDelete($storage, $entities);
    foreach ($entities as $entity) {
      if ($entity
        ->id() == 'dependency') {
        $dependent = $storage
          ->load('dependent');
        $dependent
          ->delete();
      }
    }
  }

  /**
   * {@inheritdoc}
   */
  public function calculateDependencies() {
    parent::calculateDependencies();
    if ($module = \Drupal::state()
      ->get('config_test_new_dependency', FALSE)) {
      $this
        ->addDependency('module', $module);
    }
    return $this;
  }

  /**
   * {@inheritdoc}
   */
  public function onDependencyRemoval(array $dependencies) {

    // Record which entities have this method called on and what dependencies
    // are passed.
    $called = \Drupal::state()
      ->get('config_test.on_dependency_removal_called', []);
    $called[$this
      ->id()] = $dependencies;
    $called[$this
      ->id()]['config'] = array_keys($called[$this
      ->id()]['config']);
    $called[$this
      ->id()]['content'] = array_keys($called[$this
      ->id()]['content']);
    \Drupal::state()
      ->set('config_test.on_dependency_removal_called', $called);
    $changed = parent::onDependencyRemoval($dependencies);
    if (!isset($this->dependencies['enforced']['config'])) {
      return $changed;
    }
    $fix_deps = \Drupal::state()
      ->get('config_test.fix_dependencies', []);
    foreach ($dependencies['config'] as $entity) {
      if (in_array($entity
        ->getConfigDependencyName(), $fix_deps)) {
        $key = array_search($entity
          ->getConfigDependencyName(), $this->dependencies['enforced']['config']);
        if ($key !== FALSE) {
          $changed = TRUE;
          unset($this->dependencies['enforced']['config'][$key]);
        }
      }
    }

    // If any of the dependencies removed still exists, return FALSE.
    if (array_intersect_key(array_flip($this->dependencies['enforced']['config']), $dependencies['config'])) {
      return FALSE;
    }
    return $changed;
  }

  /**
   * Sets the enforced dependencies.
   *
   * @param array $dependencies
   *   A config dependency array.
   *
   * @return $this
   *
   * @see \Drupal\Core\Config\Entity\ConfigDependencyManager
   */
  public function setEnforcedDependencies(array $dependencies) {
    $this->dependencies['enforced'] = $dependencies;
    return $this;
  }

  /**
   * {@inheritdoc}
   */
  public function isInstallable() {
    return $this->id != 'isinstallable' || \Drupal::state()
      ->get('config_test.isinstallable');
  }

}