public function source($source = null)
    {
        if ($source) {
            $this->source = $source;

            return $this;
        }

        return $this->source;
    }
public function source($source = null)
    {
        if ($source) {
            $this->source = $source;

            return $this;
        }

        return $this->source;
    }
{@inheritDoc}