check_query

# File lib/uri/generic.rb, line 500
    def check_query(v)
      return v unless v

      # raise if both hier and opaque are not nil, because:
      # absoluteURI   = scheme ":" ( hier_part | opaque_part )
      # hier_part     = ( net_path | abs_path ) [ "?" query ]
      if @opaque
        raise InvalidURIError, 
          "query conflicts with opaque"
      end

      if v && v != '' && QUERY !~ v
          raise InvalidComponentError, 
            "bad component(expected query component): #{v}"
        end

      return true
    end