Easily manage configuration files

FileManager.java

public class FileManager {

    private final JavaPlugin plugin;
    private final List<ManagedFile> managedFiles = new ArrayList<>();

    public FileManager(JavaPlugin plugin) {
        this.plugin = plugin;
        plugin.getDataFolder().mkdirs();
    }

    public void register(String name) throws IOException {
        Validate.isTrue(get(name).isPresent(), "A ManagedFile with the name of " + name + " already exists");
        managedFiles.add(new ManagedFile(plugin.getDataFolder(), name));
    }

    public void reload(String name) throws IOException {
        get(name).get().reload();
    }

    public void save(String name) throws IOException {
        get(name).get().save();
    }

    public Optional<ManagedFile> get(String name) {
        return managedFiles.stream()
                .filter(managedFile -> managedFile.name.equals(name))
                .findFirst();
    }

    public static class ManagedFile {

        private final String name;
        private final File file;
        private YamlConfiguration configuration;

        ManagedFile(File dataFolder, String name) throws IOException {
            this.name = name;
            this.file = new File(dataFolder, name + ".yml");
            if(!file.exists()) file.createNewFile();
            this.configuration = YamlConfiguration.loadConfiguration(file);
        }

        public void reload() throws IOException {
            save();
            configuration = YamlConfiguration.loadConfiguration(file);
        }

        public void save() throws IOException {
            configuration.save(file);
        }

        public String getName() {
            return name;
        }

        public File getFile() {
            return file;
        }

        public YamlConfiguration getConfiguration() {
            return configuration;
        }

    }

}