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	}

	/**
	 * Register endpoints.
	 */
	abstract public function register_endpoints();

	/**
	 * Register processors.
	 */
	public function register_processors() {
	}

	/**
	 * Register internal endpoints.
	 */
	protected function register_internal_endpoints() {
		register_rest_route( $this->get_namespace(), '/' . $this->get_rest_base(), [
			[
				'methods' => WP_REST_Server::READABLE,
				'callback' => array( $this, 'get_items' ),
				'args' => [],
				'permission_callback' => function ( $request ) {
					return $this->get_permission_callback( $request );
				},
			],
		] );
	}

	/**
	 * Register endpoint.
	 *
	 * @param string $endpoint_class
	 *
	 * @return \Elementor\Data\Base\Endpoint
	 */
	protected function register_endpoint( $endpoint_class ) {
		$endpoint_instance = new $endpoint_class( $this );

		// TODO: Validate instance like in register_sub_endpoint().

		$endpoint_route = $this->get_name() . '/' . $endpoint_instance->get_name();

		$this->endpoints[ $endpoint_route ] = $endpoint_instance;

		$command = $endpoint_route;
		$format = $endpoint_instance::get_format();

		if ( $command ) {
			$format = $command . '/' . $format;
		} else {
			$format = $format . $command;
		}

		// `$e.data.registerFormat()`.
		Manager::instance()->register_endpoint_format( $command, $format );

		return $endpoint_instance;
	}

	/**
	 * Register a processor.
	 *
	 * That will be later attached to the endpoint class.
	 *
	 * @param string $processor_class
	 *
	 * @return \Elementor\Data\Base\Processor $processor_instance
	 */
	protected function register_processor( $processor_class ) {
		$processor_instance = new $processor_class( $this );

		// TODO: Validate processor instance.

		$command = $processor_instance->get_command();

		if ( ! isset( $this->processors[ $command ] ) ) {
			$this->processors[ $command ] = [];
		}

		$this->processors[ $command ] [] = $processor_instance;

		return $processor_instance;
	}

	/**
	 * Register.
	 *
	 * Endpoints & processors.
	 */
	protected function register() {
		$this->register_internal_endpoints();
		$this->register_endpoints();

		// Aka hooks.
		$this->register_processors();
	}

	/**
	 * Retrieves a recursive collection of all endpoint(s), items.
	 *
	 * Get items recursive, will run overall endpoints of the current controller.
	 * For each endpoint it will run `$endpoint->getItems( $request ) // the $request passed in get_items_recursive`.
	 * Will skip $skip_endpoints endpoint(s).
	 *
	 * Example, scenario:
	 * Controller 'test-controller'.
	 * Controller endpoints: 'endpoint1', 'endpoint2'.
	 * Endpoint2 get_items method: `get_items() { return 'test' }`.
	 * Call `Controller.get_items_recursive( ['endpoint1'] )`, result: [ 'endpoint2' => 'test' ];
	 *
	 * @param array $skip_endpoints
	 *
	 * @return array
	 */
	public function get_items_recursive( $skip_endpoints = [] ) {
		$response = [];

		foreach ( $this->endpoints as $endpoint ) {
			// Skip self.
			if ( in_array( $endpoint, $skip_endpoints, true ) ) {
				continue;
			}

			$response[ $endpoint->get_name() ] = $endpoint->get_items( null );
		}

		return $response;
	}

	/**
	 * Get permission callback.
	 *
	 * Default controller permi