} else if (sig.equals("i")) {
command.invoke(engine, request.args(1), request.argi(2), callback);
} else if (sig.equals("f")) {
command.invoke(engine, request.args(1), request.argf(2), callback);
} else if (sig.equals("S")) {
command.invoke(engine, request.args(1), request.argS(2), callback);
} else if (sig.equals("I")) {
command.invoke(engine, request.args(1), request.argI(2), callback);
} else if (sig.equals("F")) {
command.invoke(engine, request.args(1), request.argF(2), callback);
}