code: @Deprecated
      public DomainNameMapping<V> add(String hostname, V output) {
          map.put(normalizeHostname(checkNotNull(hostname, "hostname")), checkNotNull(output, "output"));
          return this;
      }
docs: Adds a mapping that maps the specified (optionally wildcard) host name to the specified output value.
  <p>
  <a href="http://en.wikipedia.org/wiki/Wildcard_DNS_record">DNS wildcard</a> is supported as hostname.
  For example, you can use {@code *.netty.io} to match {@code netty.io} and {@code downloads.netty.io}.
  </p>
  
  @param hostname the host name (optionally wildcard)
  @param output   the output value that will be returned by {@link #map(String)} when the specified host name
  matches the specified input host name
  @deprecated use {@link DomainNameMappingBuilder} to create and fill the mapping instead