code: public Integer getTableIndex(final String _tableName,
                                   final String _column,
                                   final int _relIndex,
                                   final Long _clazzId)
      {
          return this.sqlTable2Index.get(_relIndex + "__" + _tableName + "__" + _column
                          + (_clazzId == null ? "" : "__" + _clazzId));
      }
docs: Method to get an table index from {@link #sqlTable2Index}.
  
  @param _tableName tablename the index is wanted for
  @param _column name of the column, used for the relation
  @param _relIndex relation the table is used in
  @param _clazzId optional id of the classification
  @return index of the table or null if not found