    # File lib/fog/google/models/storage/files.rb, line 22
            def all(options = {})
              requires :directory
              options = {
                'delimiter'   => delimiter,
                'marker'      => marker,
                'max-keys'    => max_keys,
                'prefix'      => prefix
              }.merge!(options)
              options = options.reject {|key,value| value.nil? || value.to_s.empty?}
              merge_attributes(options)
              parent = directory.collection.get(
                directory.key,
                options
              )
              if parent
                merge_attributes(parent.files.attributes)
                load(parent.files.map {|file| file.attributes})
              else
                nil
              end
            end