final/src/UtilityFunction.java

import java.awt.event.KeyEvent;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.lang.reflect.Array;
import java.util.ArrayList;

public final class UtilityFunction {
    private UtilityFunction(){}

    public static KeyEvent intercept(KeyEvent e, ArrayList<Middleware> middlewareArray) {
        for (Middleware m: middlewareArray) {
            if (m.canIntercept(e)) {
                e = m.interceptKey(e);
                return e;
            }
        }
        return e;
    }

    public static int processBox(KeyEvent e, int currentBox, ArrayList<TextBox> textBoxArray) {
        if (e.getKeyCode() == KeyEvent.VK_UP || e.getKeyCode() == KeyEvent.VK_W) {
            // if currentBox > 0, subtract one
            // else, set to TOTAL_BOXES-1
            return currentBox > 0 ? currentBox - 1:textBoxArray.size() - 1;
        } else if (e.getKeyCode() == KeyEvent.VK_DOWN || e.getKeyCode() == KeyEvent.VK_S) {
            // if currentBox > total box amount - 1, set to 0
            // else, set to TOTAL_BOXES-1
            return currentBox < textBoxArray.size() - 1 ? currentBox + 1:0;
        }
        return currentBox;
    }
}