code: @Override
  	public void addOperator(String operator, FunctionDescriptor fd)
      {
          m_operatorMap.put(operator, fd);
      }
docs: /* (non-Javadoc)
  @see nz.co.senanque.rulesparser.FunctionDescriptorHolder#addOperator(java.lang.String, nz.co.senanque.rulesparser.FunctionDescriptor)