Constructor.
array $filters Filters for the asset:
string $sourceRoot The root directory:
string $sourcePath The asset path:
array $vars:
public function __construct($filters = array(), $sourceRoot = null, $sourcePath = null, array $vars = array()) {
$this->filters = new FilterCollection($filters);
$this->sourceRoot = $sourceRoot;
$this->sourcePath = $sourcePath;
$this->vars = $vars;
$this->values = array();
$this->loaded = false;
}