private function readConfig()
{
if (!$this->filename) {
throw new \RuntimeException('A valid configuration file must be passed before reading the config.');
}
if (!file_exists($this->filename)) {
throw new \InvalidArgumentException(sprintf("The config file '%s' does not exist.", $this->filename));
}
if ($this->driver->supports($this->filename)) {
return $this->driver->load($this->filename);
}
throw new \InvalidArgumentException(sprintf("The config file '%s' appears to have an invalid format.", $this->filename));
}
function supports($filename)
{
return $this->driver->supports($filename);
}