autoloader.php

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<?php
function _elgg_services() {
    static $provider;
    if (null === $provider) {
        $provider = _elgg_create_service_provider();
    }
    return $provider;
}

function _elgg_create_service_provider() {
    $loader = new \Elgg\ClassLoader(new \Elgg\ClassMap());
    // until the cache can be loaded, just setup PSR-0 autoloading
    // out of the classes directory. No need to build a full map.
    $loader->register();
    $manager = new \Elgg\AutoloadManager($loader);

    return new \Elgg\Di\ServiceProvider($manager);
}

function _elgg_load_autoload_cache() {
    $manager = _elgg_services()->autoloadManager;
    $manager->setStorage(elgg_get_system_cache());
    if (! $manager->loadCache()) {
        $manager->addClasses(dirname(dirname(__FILE__)) . '/classes');
    }
}

function _elgg_save_autoload_cache() {
    _elgg_services()->autoloadManager->saveCache();
}

function _elgg_delete_autoload_cache() {
    _elgg_services()->autoloadManager->deleteCache();
}

function elgg_get_class_loader() {
    return _elgg_services()->autoloadManager->getLoader();
}

function elgg_register_classes($dir) {
    _elgg_services()->autoloadManager->addClasses($dir);
}

function elgg_register_class($class, $location) {
    _elgg_services()->autoloadManager->setClassPath($class, $location);
    return true;
}

return function(\Elgg\EventsService $events, \Elgg\HooksRegistrationService $hooks) {
    $events->registerHandler('shutdown', 'system', '_elgg_save_autoload_cache', 1000);
    $events->registerHandler('upgrade', 'all', '_elgg_delete_autoload_cache');
};