public static List parseCommandLineArguments()

in sshd-cli/src/main/java/org/apache/sshd/cli/client/SshKeyScanMain.java [631:708]
69 lines of code
14 McCabe index (conditional complexity)

    public static List<String> parseCommandLineArguments(SshKeyScanMain scanner, String... args) throws IOException {
        int numArgs = GenericUtils.length(args);
        for (int index = 0; index < numArgs; index++) {
            String optName = args[index];
            if ("-f".equals(optName)) {
                index++;
                ValidateUtils.checkTrue(index < numArgs, "Missing %s option argument", optName);
                ValidateUtils.checkTrue(scanner.getInputStream() == null, "%s option re-specified", optName);

                String filePath = args[index];
                if ("-".equals(filePath)) {
                    scanner.setInputStream(new NoCloseInputStream(System.in));
                } else {
                    scanner.setInputStream(new FileInputStream(filePath));
                }
            } else if ("-t".equals(optName)) {
                index++;
                ValidateUtils.checkTrue(index < numArgs, "Missing %s option argument", optName);
                ValidateUtils.checkTrue(GenericUtils.isEmpty(scanner.getKeyTypes()), "%s option re-specified", optName);

                String typeList = args[index];
                String[] types = GenericUtils.split(typeList, ',');
                ValidateUtils.checkTrue(GenericUtils.length(types) > 0, "No types specified for %s", optName);
                scanner.setKeyTypes(Arrays.asList(types));
            } else if ("-p".equals(optName)) {
                index++;
                ValidateUtils.checkTrue(index < numArgs, "Missing %s option argument", optName);
                ValidateUtils.checkTrue(scanner.getPort() <= 0, "%s option re-specified", optName);

                String portValue = args[index];
                int port = Integer.parseInt(portValue);
                ValidateUtils.checkTrue((port > 0) && (port <= 0xFFFF), "Bad port: %s", portValue);
                scanner.setPort(port);
            } else if ("-T".equals(optName)) {
                index++;
                ValidateUtils.checkTrue(index < numArgs, "Missing %s option argument", optName);
                ValidateUtils.checkTrue(scanner.getTimeout() <= 0, "%s option re-specified", optName);

                String timeoutValue = args[index];
                long timeout = Long.parseLong(timeoutValue);
                ValidateUtils.checkTrue(timeout > 0L, "Bad timeout: %s", timeoutValue);
                scanner.setTimeout(timeout);
            } else if ("-v".equals(optName)) {
                ValidateUtils.checkTrue(scanner.getLogLevel() == null, "%s option re-specified", optName);
                scanner.setLogLevel(Level.FINEST);
            } else if ("-io".equals(optName)) {
                if ((index + 1) >= numArgs) {
                    System.err.println("option requires an argument: " + optName);
                    break;
                }

                String provider = args[++index];
                BuiltinIoServiceFactoryFactories factory
                        = CliSupport.resolveBuiltinIoServiceFactory(System.err, optName, provider);
                if (factory != null) {
                    System.setProperty(IoServiceFactory.class.getName(), factory.getFactoryClassName());
                } else {
                    break;
                }
            } else { // stop at first non-option - assume the rest are host names/addresses
                ValidateUtils.checkTrue(optName.charAt(0) != '-', "Unknown option: %s", optName);

                int remaining = numArgs - index;
                if (remaining == 1) {
                    return Collections.singletonList(optName);
                }

                List<String> hosts = new ArrayList<>(remaining);
                for (; index < numArgs; index++) {
                    hosts.add(args[index]);
                }

                return hosts;
            }
        }

        return Collections.emptyList();
    }