a command parser sytem

Main.java

import lombok.NonNull;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        try (Scanner scanner = new Scanner(System.in)) {
            while (scanner.hasNextLine()) {
                String line = scanner.nextLine();
                List<String> arguments = getArguments(line);
                System.out.println(arguments);
            }
        }
    }

    public static @NonNull List<String> getArguments(@NonNull String command) {
        String[] split = command.split(" ");
        int splitLength = split.length;
        List<String> arguments = new ArrayList<>(splitLength);

        StringBuilder stringBuilder = new StringBuilder();

        for (int i = 0; i < splitLength; i++) {
            String string = split[i];
            int length = string.length();
            if (length == 0)
                continue;

            if (string.charAt(0) == '"') { //possible start
                if (length == 1) { //only a quote
                    if (i + 1 < splitLength) { //there are more strings
                        if (stringBuilder.isEmpty()) {
                            stringBuilder.append('"');
                            continue;
                        }

                        arguments.add(stringBuilder.substring(1).trim());
                        stringBuilder.setLength(0);
                        continue;
                    }

                    //no more strings
                    if (stringBuilder.isEmpty()) {
                        arguments.add("\""); //only a quote
                        continue;
                    }

                    arguments.add(stringBuilder.substring(1).trim()); //end of the string
                    stringBuilder.setLength(0);
                    continue;
                }

                if (string.charAt(length - 1) == '"') {
                    if (length >= 3 && string.charAt(length - 2) == '\\') { //escaped quote
                        stringBuilder.append(string, 0, length - 2).append(' ');
                        continue;
                    }

                    //end of the string
                    stringBuilder.append(string);
                    arguments.add(stringBuilder.substring(1, stringBuilder.length() - 1));
                    stringBuilder.setLength(0);
                    continue;
                }

                //started the string
                stringBuilder.append(string).append(' ');
                continue;
            }

            if (string.charAt(length - 1) == '"') { //possible end
                if (length >= 2 && string.charAt(length - 2) == '\\') { //escaped quote
                    if (stringBuilder.isEmpty()) {
                        arguments.add(string.substring(0, length - 2) + '"');
                        continue;
                    }

                    stringBuilder.append(string, 0, length - 2).append("\" ");
                    continue;
                }

                //end of the string
                if (stringBuilder.isEmpty()) {
                    arguments.add(string);
                    continue;
                }

                arguments.add(stringBuilder.append(string).substring(1, stringBuilder.length() - 1).trim());
                stringBuilder.setLength(0);
                continue;
            }

            if (stringBuilder.isEmpty()) {
                arguments.add(string);
                continue;
            }

            stringBuilder.append(string).append(' ');
        }

        if (!stringBuilder.isEmpty())
            return Collections.emptyList();

        return arguments;
    }
}