function MigrationPluginManager::getDiscovery

Gets the plugin discovery.

This method overrides DefaultPluginManager::getDiscovery() in order to search for migration configurations in the MODULENAME/migrations directory.

Overrides DefaultPluginManager::getDiscovery

File

core/modules/migrate/src/Plugin/MigrationPluginManager.php, line 69

Class

MigrationPluginManager

Plugin manager for migration plugins.

Namespace

Code

protected function getDiscovery() {
  if (!isset($this->discovery)) {
    $directories = array_map(function ($directory) {
      return [
        $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;
}