class Workspace

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')->setLabel(new TranslatableMarkup('Workspace name'))
      ->setDescription(new TranslatableMarkup('The workspace name.'))
      ->setRevisionable(TRUE)
      ->setSetting('max_length', 128)
      ->setRequired(TRUE);
    $fields['uid']->setLabel(new TranslatableMarkup('Owner'))
      ->setDescription(new TranslatableMarkup('The workspace owner.'))
      ->setDisplayOptions('form', [
      'type' => 'entity_reference_autocomplete',
      'weight' => 5,
    ])
      ->setDisplayConfigurable('form', TRUE);
    $fields['parent'] = BaseFieldDefinition::create('entity_reference')->setLabel(new TranslatableMarkup('Parent'))
      ->setDescription(new TranslatableMarkup('The parent workspace.'))
      ->setSetting('target_type', 'workspace')
      ->setReadOnly(TRUE)
      ->setDisplayConfigurable('form', TRUE)
      ->setDisplayOptions('form', [
      'type' => 'options_select',
      'weight' => 10,
    ]);
    $fields['changed'] = BaseFieldDefinition::create('changed')->setLabel(new TranslatableMarkup('Changed'))
      ->setDescription(new TranslatableMarkup('The time that the workspace was last edited.'))
      ->setRevisionable(TRUE);
    $fields['created'] = BaseFieldDefinition::create('created')->setLabel(new TranslatableMarkup('Created'))
      ->setDescription(new TranslatableMarkup('The time that the workspace was created.'));
    return $fields;
  }
  
  /**
   * {@inheritdoc}
   */
  public function publish() {
    return \Drupal::service('workspaces.operation_factory')->getPublisher($this)
      ->publish();
  }
  
  /**
   * {@inheritdoc}
   */
  public function getCreatedTime() {
    return $this->get('created')->value;
  }
  
  /**
   * {@inheritdoc}
   */
  public function setCreatedTime($created) {
    return $this->set('created', (int) $created);
  }
  
  /**
   * {@inheritdoc}
   */
  public function hasParent() {
    return !$this->get('parent')
      ->isEmpty();
  }
  
  /**
   * {@inheritdoc}
   */
  public static function preDelete(EntityStorageInterface $storage, array $entities) {
    parent::preDelete($storage, $entities);
    $workspace_tree = \Drupal::service('workspaces.repository')->loadTree();
    // Ensure that workspaces that have descendants can not be deleted.
    foreach ($entities as $entity) {
      if (!empty($workspace_tree[$entity->id()]['descendants'])) {
        throw new \InvalidArgumentException("The {$entity->label()} workspace can not be deleted because it has child workspaces.");
      }
    }
  }
  
  /**
   * {@inheritdoc}
   */
  public static function postDelete(EntityStorageInterface $storage, array $entities) {
    parent::postDelete($storage, $entities);
    // Add the IDs of the deleted workspaces to the list of workspaces that will
    // be purged on cron.
    $state = \Drupal::state();
    $deleted_workspace_ids = $state->get('workspace.deleted', []);
    $deleted_workspace_ids += array_combine(array_keys($entities), array_keys($entities));
    $state->set('workspace.deleted', $deleted_workspace_ids);
    // Trigger a batch purge to allow empty workspaces to be deleted
    // immediately.
    \Drupal::service('workspaces.manager')->purgeDeletedWorkspacesBatch();
  }

}