code: public void addTagIdMappings(String tagId, String realId, String realName)
      {
          assert (tagId != null) : "The parameter 'tagId' must not be null";
          assert (realId != null) : "The parameter 'realId' must not be null";
  
          _writeId = true;
  
          if (realName != null) {
              if (_idToNameMap == null)
                  _idToNameMap = new HashMap/*<String, String>*/();
              _idToNameMap.put(tagId, realName);
          }
      }
docs: This will add the mapping between the tagId and the real name to the NameMap hashmap.
  @param tagId
  @param realId
  @param realName