code: public static FromMatchesFilter create(Jid address) {
          return new FromMatchesFilter(address, address != null ? address.hasNoResource() : false) ;
      }
docs: Creates a filter matching on the "from" field. If the filter address is bare, compares
  the filter address with the bare from address. Otherwise, compares the filter address
  with the full from address.
  
  @param address The address to filter for. If <code>null</code> is given, the stanza must not
  have a from address.
  @return filter for the "from" address.