src/main/java/com/it_jaros/networkScanner/CliParser.java


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package com.it_jaros.networkScanner;

import java.util.HashSet;
import java.util.Set;

public class CliParser {
    
    public ScanOptions parseArgs(String[] args) {
        if (args.length < 1 || args[0].trim().equals("")) {
            throw new IllegalArgumentException("No argument given");
        }
        
        Set<String> targets = new HashSet<>();
        int socketLimit = 1000;
        int delayInMillis = 0;
        for (int i = 0; i < args.length; i++) {
            final String currentArg = args[i];
            if (!currentArg.startsWith("-")) {
                targets.add(currentArg);
                continue;
            }

            try {
                switch (currentArg) {
                    case "--help", "-h":
                        usageAndExit();
                    case "--socketLimit", "-sl":
                        socketLimit = Integer.parseInt(args[++i]);
                        break;
                    case "--delay", "-d":
                        delayInMillis = Integer.parseInt(args[++i]);
                        break;
                    default:
                        throw new IllegalArgumentException("No such param " + currentArg);
                }
            } catch (IndexOutOfBoundsException | NumberFormatException e) {
                System.out.printf("Missing or wrong argument for option %s", currentArg);
                System.exit(2);
            }
        }

        System.out.printf(
                "Scanning targets '%s' with socketLimit(%s), delayInMillis(%s) \n", targets, socketLimit, delayInMillis);
        
        return new ScanOptions(targets.stream().toList(), socketLimit, delayInMillis);
    }

    public void usageAndExit() {
        System.err.println("""
                Usage:
                    java -jar scanner.jar [OPTIONS] <host>

                Options:
                    --delay, -d: Waiting period in millis for connection attempts for a host
                    --socketLimit, -sl: Socket Connection limit for a host

                Examples:
                    java -jar scanner.jar localhost
                    java -jar scanner.jar fd00::1
                """);
        System.exit(1);
    }
}