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();
    }

}