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.
/**
* This file contains the interface required to implmeent a content writer.
*
* @package core_privacy
* @copyright 2018 Andrew Nicols
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
namespace core_privacy\local\request;
defined('MOODLE_INTERNAL') || die();
/**
* The writer factory class used to fetch and work with the content_writer.
*
* @copyright 2018 Andrew Nicols
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class writer {
/**
* @var writer The singleton instance of this writer.
*/
protected static $instance = null;
/**
* @var content_writer The current content_writer instance.
*/
protected $realwriter = null;
/**
* Constructor for the content writer.
*
* Protected to prevent direct instantiation.
*/
protected function __construct() {
}
/**
* Singleton to return or create and return a copy of a content_writer.
*
* @return content_writer
*/
protected function get_writer_instance() : content_writer {
if (null === $this->realwriter) {
if (PHPUNIT_TEST) {
$this->realwriter = new \core_privacy\tests\request\content_writer(static::instance());
} else {
$this->realwriter = new moodle_content_writer(static::instance());
}
}
return $this->realwriter;
}
/**
* Create a real content_writer for use by PHPUnit tests,
* where a mock writer will not suffice.
*
* @return content_writer
*/
public static function setup_real_writer_instance() {
if (!PHPUNIT_TEST) {
throw new coding_exception('setup_real_writer_instance() is only for use with PHPUnit tests.');
}
$instance = static::instance();
if (null === $instance->realwriter) {
$instance->realwriter = new moodle_content_writer(static::instance());
}
}
/**
* Return an instance of
*/
protected static final function instance() {
if (null === self::$instance) {
self::$instance = new static();
}
return self::$instance;
}
/**
* Reset the writer and content_writer.
*/
public static final function reset() {
static::$instance = null;
}
/**
* Provide an instance of the writer with the specified context applied.
*
* @param \context $context The context to apply
* @return content_writer The content_writer
*/
public static function with_context(\context $context) : content_writer {
return static::instance()
->get_writer_instance()
->set_context($context);
}
/**
* Export the specified user preference.
*
* @param string $component The name of the component.
* @param string $key The name of th key to be exported.
* @param string $value The value of the preference
* @param string $description A description of the value
* @return content_writer
*/
public static function export_user_preference(
string $component,
string $key,
string $value,
string $description
) : content_writer {
return static::with_context(\context_system::instance())
->export_user_preference($component, $key, $value, $description);
}
}