Advent of Code 2017 - Abstract Challenge Class, Loader, Runner, and more

AdventOfCode.java

package util;

import java.util.List;

public abstract class AdventOfCode {

    protected List<String> input;

    public AdventOfCode(List<String> input) {
        this.input = input;
        parse();
    }

    public abstract Object part1();
    public abstract Object part2();
    public abstract void parse();

    public void run() {
        System.out.println("Part 1:" + part1().toString());
        System.out.println("Part 2:" + part2().toString());
    }
}

DayLoader.java

package util;

import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.util.List;

public class DayLoader {

    private DayLoader() {}

    public static AdventOfCode getClassForDay(int year, int day) {
        if (year < 2015 || year > 2017 || day < 1 || day > 25) {
            throw new IllegalArgumentException("Invalid date for Advent of Code.");
        }
        try {
            String name = "Advent" + year + ".Day" + day;
            Constructor constructor = Class.forName(name).getConstructor(List.class);
            return (AdventOfCode)constructor.newInstance(FileIO.getAOCInputForDay(year, day, FileIO.SESSION_ID));

        } catch (ClassNotFoundException | InstantiationException |
                IllegalAccessException | InvocationTargetException |
                NoSuchMethodException e) {
            e.printStackTrace();
            return null;
        }

    }
}

Make.java

package Advent2017;

import util.FileIO;

import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.List;
import java.util.stream.Collectors;

public class Make {

    private static void makeDay(int year, int day) {
        String className = "Day" + day;
        String file = "src/Advent" + year + "/" + className + ".java";
        if (!Files.exists(Paths.get(file))) {
            List<String> template = FileIO.getFileAsList("advent_template.txt");
            template = template.stream()
                    .map(x -> x.replace("Template", className))
                    .collect(Collectors.toList());
            FileIO.writeListToFile(template, file);
            System.out.println("Writing file: " + file);
        } else {
            System.out.println("File: " + file + " already exists.");
        }
    }

    private static void makeAll(int year) {
        for (int i = 0; i < 26; i++) {
            makeDay(year, i);
        }
    }

    public static void main(String[] args) {
        makeAll(2017);
    }
}

Runner.java

package util;

public class Runner {

    public static void runAll(int year, int upToDay) {
        for (int i = 1; i <= upToDay; i++) {
            run(year, i);
        }
    }

    public static void run(int year, int day) {
        AdventOfCode challenge = DayLoader.getClassForDay(year, day);
        if (challenge == null) throw new RuntimeException("Unable to load class/input");
        Timer.startTimer();
        System.out.println("<===== Advent of Code challenge output for Year: " + year + " - Day " + day + " =====>");
        challenge.run();
        System.out.println(Timer.endTimer());
    }

    public static void main(String[] args) {

        runAll(2017, 16);
    }
}