/**
* Determines the command denoted by the line.
*
* @param line the text as typed in at the console.
* @return the command represented by the line, or NONE if the line is empty.
* @throws InvalidCommandException if no recognizable command was found on a non-empty line.
*/
static Command getCommand(String line) throws InvalidCommandException {
StringTokenizer tokenizer = new StringTokenizer(line);
if (!tokenizer.hasMoreTokens()) {
return NONE;
}
String command = tokenizer.nextToken();
/* Check for a manifest command */
for (Command c : Command.values()) {
if (c.manifest && c.name().equalsIgnoreCase(command)) {
if (!tokenizer.hasMoreTokens()) {
return c;
}
/* Extra token. */
throw new InvalidCommandException(
"Unexpected argument: " + tokenizer.nextToken() + " for command: " + command);
}
}
/* A stock update command, token following arg must be a price*/
if (!tokenizer.hasMoreTokens()) {
throw new InvalidCommandException("Unknown command: " + command + "\n" + StockQuotes.usage());
}
String price = tokenizer.nextToken();
try {
Float.parseFloat(price);
if (tokenizer.hasMoreTokens()) {
throw new InvalidCommandException("Extraneous argument: " + tokenizer.nextToken());
}
} catch (NumberFormatException e) {
throw new InvalidCommandException("Stock price must be a numeric value, not: " + price);
}
return UPDATE;
}
public static void main(String[] argv) throws Exception {
StockQuotes stockQuotes = new RouterDrivenStockQuotes(argv);
stockQuotes.runExample();
}
