String applyGetOperators(String expr) throws UnableToCompleteException {
if(operators == null) return expr;
for (Iterator<OperatorInfo> i = operators.iterator(); i.hasNext();) {
OperatorInfo oper = i.next();
expr = oper.onGetExpr(expr);
}
return expr;
}
String applySetOperators(String expr) throws UnableToCompleteException {
if(operators == null) return expr;