docs: @Override
  	public FieldDescriptor findOperandInScope(String scope, String operand)
      {
          ObjectDescriptor currentScope = m_classes.get(scope);
          StringTokenizer st = new StringTokenizer(operand,".");
          FieldDescriptor ret = null;
          while(st.hasMoreTokens())
          {
              if (currentScope == null)
              {
                  return null;
              }
              String token = st.nextToken();
              ret = currentScope.get(token);
              if (ret == null)
              {
                  if (currentScope.getParent() != null)
                  {
                      return findOperandInScope(currentScope.getParent(),operand);
                  }
                  return null;
              }
              currentScope = m_classes.get(ret.getType());
          }
          return ret;
      }