Terminal-Reply

Terminal.java

package org.csystem.cmdpromptapp.app;

import java.util.ArrayList;
import java.util.Scanner;
import java.util.function.Consumer;


public class Terminal {
    public static void main(String[] args)
    {
        // Evaluate find print loop REPL App
        Terminal terminal = new Terminal();
        terminal.run();
    }
    private static final Scanner m_kb = new Scanner(System.in);

    // Enum 0 ve 1 dememek için parse ederken neyin-nerede olduğu split için aslında.
    private enum Info {
        OPERATION, INPUT;
    }


    // inner class sadece biz kullanacağız dışarıya açmıyoruz.
    private class Command {
        public String Cmd;
        public Consumer<String> Proc;

        public Command(String cmd, Consumer<String> consumer)
        {
            Cmd = cmd;
            Proc = consumer;
        }
    }

    private ArrayList<Command> m_commands;

    private void init()
    {
        m_commands = new ArrayList<>();
        addCommandToTerminal();
    }

    private void addCommandToTerminal()
    {
        //m_commands.add( new Command("reverse", input -> System.out.println(StringUtil.reverseWithStrBuilderWay(input))) );
        m_commands.add( new Command("len", input -> System.out.println(input.length())) );
        // m_commands.add( new Command("isPrime", NumberUtil::isPrime) ); //kendin sınıf yaz araya gir.
        m_commands.add( new Command("clear", input -> System.out.println("\n\n\n\n\n\n\n\n\n\n\n\n") ) );
    }

    public Terminal()
    {
        init();
        //...
    }

    public Command findCommandByName(String cmd)
    {
        for (Command c : m_commands) {
            if (c.Cmd.equalsIgnoreCase(cmd))
                return c;
        }

        return null;
    }


    public void run()
    {

        // Loop
        for (;;) {
            // Read
            System.out.println("operation?-input?");
            String operationInput = m_kb.nextLine();

            if (operationInput.equalsIgnoreCase("exit"))
                return;

            // Parse
            String [] parts = operationInput.split("-");

            // Evaluate & Find Command From Collection
            Command c = findCommandByName(parts[Info.OPERATION.ordinal()]);

            if (c != null)
                c.Proc.accept(parts[1]); // print
            else
                System.out.println("command not found: " + operationInput); //...
        }
    }
}

REPL APP - Command Line Interface App