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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
/**
* Statement attachment for xAPI structure checking and usage.
*
* @package core_xapi
* @copyright 2020 Ferran Recio
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
namespace core_xapi\local\statement;
use core_xapi\xapi_exception;
use core_xapi\iri;
use stdClass;
/**
* Abstract xAPI attachment class.
*
* @copyright 2020 Ferran Recio
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class item_attachment extends item {
/**
* Function to create an item from part of the xAPI statement.
*
* @param stdClass $data the original xAPI element
* @return item item_attachment xAPI generated
*/
public static function create_from_data(stdClass $data): item {
if (empty($data->usageType)) {
throw new xapi_exception("missing attachment usageType");
}
if (!iri::check($data->usageType)) {
throw new xapi_exception("attachment usageType $data->usageType is not a valid IRI");
}
if (empty($data->display)) {
throw new xapi_exception("missing attachment display");
}
if (empty($data->contentType)) {
throw new xapi_exception("missing attachment contentType");
}
if (empty($data->length)) {
throw new xapi_exception("missing attachment length");
}
if (!is_numeric($data->length)) {
throw new xapi_exception("invalid attachment length format");
}
if (empty($data->sha2)) {
throw new xapi_exception("missing attachment sha2");
}
// More required property checks will appear here in the future.
return new self($data);
}
}