public function setOptions($options)
    {
        $this->options = [
            'config_dir' => null,
            'cache_dir' => null,
            'debug' => false,
            'cache_class' => 'WebspaceCollectionCache',
            'base_class' => 'WebspaceCollection',
        ];

        // overwrite the default values with the given options
        $this->options = array_merge($this->options, $options);
    }