protected function loadCollection($currentDir = null)
{
if ($this->innerCollection) {
throw new RuntimeException('The asset collection was loaded already.');
}
// Load the inner collection
// The current Puli directory is null if the currently loaded Twig
// template was not loaded via the Puli loader
$this->innerCollection = $this->factory->createAssetForCurrentDir($currentDir, $this->inputs, $this->filters, $this->options);
// GC
$this->factory = null;
$this->inputs = null;
$this->filters = null;
$this->options = null;
}
