function MigrationPluginManager::getDiscovery

Gets the plugin discovery.

This method overrides DefaultPluginManager::getDiscovery() in order to search for migration configurations in the MODULENAME/migrations and MODULENAME/migration_templates directories. Throws a deprecation notice if the MODULENAME/migration_templates directory exists.

Overrides DefaultPluginManager::getDiscovery

File

core/modules/migrate/src/Plugin/MigrationPluginManager.php, line 70

Class

MigrationPluginManager

Plugin manager for migration plugins.

Namespace

Code

protected function getDiscovery() {
    if (!isset($this->discovery)) {
        $directories = array_map(function ($directory) {
            // Check for use of the @deprecated /migration_templates directory.
            // @todo Remove use of /migration_templates in Drupal 9.0.0.
            if (is_dir($directory . '/migration_templates')) {
                @trigger_error('Use of the /migration_templates directory to store migration configuration files is deprecated in Drupal 8.1.0 and will be removed before Drupal 9.0.0. See https://www.drupal.org/node/2920988.', E_USER_DEPRECATED);
            }
            // But still accept configurations found in /migration_templates.
            return [
                $directory . '/migration_templates',
                $directory . '/migrations',
            ];
        }, $this->moduleHandler
            ->getModuleDirectories());
        $yaml_discovery = new YamlDirectoryDiscovery($directories, 'migrate');
        // This gets rid of migrations which try to use a non-existent source
        // plugin. The common case for this is if the source plugin has, or
        // specifies, a non-existent provider.
        $only_with_source_discovery = new NoSourcePluginDecorator($yaml_discovery);
        // This gets rid of migrations with explicit providers set if one of the
        // providers do not exist before we try to use a potentially non-existing
        // deriver. This is a rare case.
        $filtered_discovery = new ProviderFilterDecorator($only_with_source_discovery, [
            $this->moduleHandler,
            'moduleExists',
        ]);
        $this->discovery = new ContainerDerivativeDiscoveryDecorator($filtered_discovery);
    }
    return $this->discovery;
}