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May 9th, 2025

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package nl.rug.oop.rpg;
import java.io.*;
import java.util.Scanner;
/**
* Utility class for saving and loading.
*/
public class SaveManager {
/**
* The directory where the saves are stored.
*/
public static final String SAVED_GAMES_DIRECTORY = "savedgames";
/**
* The file extension for saves.
*/
public static final String SAVE_FILE_EXTENSION = ".ser";
/**
* Saves the current state of the game.
*
* @param game The game object to be saved.
* @param filename The name of the file.
*/
public static void saveGame(Game game, String filename) {
ensureDirectory();
try (ObjectOutputStream out = new ObjectOutputStream(
new FileOutputStream(getFullPath(filename)))) {
out.writeObject(game);
System.out.println("Quicksave successful!");
} catch (IOException e) {
System.err.println("Failed to save game: " + e.getMessage());
}
}
/**
* Loading a file.
*
* @param filename The name of the file.
* @return A game object representing the loaded state.
*/
public static Game loadGame(String filename) {
try (ObjectInputStream in = new ObjectInputStream(
new FileInputStream(getFullPath(filename)))) {
System.out.println("Quickload successful!");
return (Game) in.readObject();
} catch (IOException | ClassNotFoundException e) {
System.err.println("Failed to load game: " + e.getMessage());
return null;
}
}
/**
* Displays a list of available saves for the user to pick.
*
* @param scanner scanner object to read user input.
* @return the loaded game object.
*/
public static Game promptAndLoadSave(Scanner scanner) {
File folder = new File(SAVED_GAMES_DIRECTORY);
File[] saves = folder.listFiles((dir, name) -> name.endsWith(SAVE_FILE_EXTENSION));
if (saves == null || saves.length == 0) {
System.out.println("No save files found.");
return null;
}
System.out.println("Which file? (-1 : none)");
for (int i = 0; i < saves.length; i++) {
System.out.println("(" + i + ") " + saves[i].getName());
}
int choice = scanner.nextInt();
if (choice >= 0 && choice < saves.length) {
return loadGame(saves[choice].getName());
}
return null;
}
/**
* Returns the full path of the file.
*
* @param filename The name of the file.
* @return The full path of the file.
*/
private static String getFullPath(String filename) {
return SAVED_GAMES_DIRECTORY +
File.separator +
filename +
(filename.endsWith(SAVE_FILE_EXTENSION) ? "" : SAVE_FILE_EXTENSION);
}
/**
* Ensures that the directory exists.
*/
private static void ensureDirectory() {
File saveDir = new File(SAVED_GAMES_DIRECTORY);
if (!saveDir.exists()) {
saveDir.mkdir();
}
}
}

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