LocalStorage.java

package fr.romain.ass3.persist;

import android.content.Context;

import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;

import fr.romain.ass3.MainActivity;

public final class LocalStorage {
    public static boolean save(Object data) {
        Class<?> clazz = data.getClass();
        
        try (ObjectOutputStream stream = new ObjectOutputStream(MainActivity.context()
                .openFileOutput(fileNameFactory(clazz), Context.MODE_PRIVATE))) 
        {
            stream.writeObject(data);
        } catch (Exception e) {
            return false;
        }
        return true;
    }

    public static <T> T load(Class<? extends T> clazz) {
        try (ObjectInputStream stream = new ObjectInputStream(MainActivity.context()
                .openFileInput(fileNameFactory(clazz)))) 
        {
            Object loaded = stream.readObject();
            return (T) loaded;
        } catch (Exception e) { 
            return null;
        }
    }
    
    private static String fileNameFactory(Class<?> clazz) {
        return clazz.getSimpleName() + ".dat";
    }
}