SpringアプリケーションでCSVを介して設定データを外部化する

public  List loadObjectList(Class type, String fileName) {
    try {
        CsvSchema bootstrapSchema = CsvSchema.emptySchema().withHeader();
        CsvMapper mapper = new CsvMapper();
        File file = new ClassPathResource(fileName).getFile();
        MappingIterator readValues =
          mapper.reader(type).with(bootstrapSchema).readValues(file);
        return readValues.readAll();
    } catch (Exception e) {
        logger.error("Error occurred while loading object list from file " + fileName, e);
        return Collections.emptyList();
    }
}

public List loadManyToManyRelationship(String fileName) {
    try {
        CsvMapper mapper = new CsvMapper();
        CsvSchema bootstrapSchema = CsvSchema.emptySchema().withSkipFirstDataRow(true);
        mapper.enable(CsvParser.Feature.WRAP_AS_ARRAY);
        File file = new ClassPathResource(fileName).getFile();
        MappingIterator readValues =
          mapper.reader(String[].class).with(bootstrapSchema).readValues(file);
        return readValues.readAll();
    } catch (Exception e) {
        logger.error(
          "Error occurred while loading many to many relationship from file = " + fileName, e);
        return Collections.emptyList();
    }
}

role,privilege
ROLE_ADMIN,ADMIN_READ_PRIVILEGE
ROLE_ADMIN,ADMIN_WRITE_PRIVILEGE
ROLE_SUPER_USER,POST_UNLIMITED_PRIVILEGE
ROLE_USER,POST_LIMITED_PRIVILEGE

public List getPrivileges() {
    return csvDataLoader.loadObjectList(Privilege.class, PRIVILEGES_FILE);
}

public List getRoles() {
    List allPrivileges = getPrivileges();
    List roles = csvDataLoader.loadObjectList(Role.class, ROLES_FILE);
    List rolesPrivileges = csvDataLoader.
      loadManyToManyRelationship(SetupData.ROLES_PRIVILEGES_FILE);

    for (String[] rolePrivilege : rolesPrivileges) {
        Role role = findRoleByName(roles, rolePrivilege[0]);
        Set privileges = role.getPrivileges();
        if (privileges == null) {
            privileges = new HashSet();
        }
        privileges.add(findPrivilegeByName(allPrivileges, rolePrivilege[1]));
        role.setPrivileges(privileges);
    }
    return roles;
}

private Role findRoleByName(List roles, String roleName) {
    return roles.stream().
      filter(item -> item.getName().equals(roleName)).findFirst().get();
}

private Privilege findPrivilegeByName(List allPrivileges, String privilegeName) {
    return allPrivileges.stream().
      filter(item -> item.getName().equals(privilegeName)).findFirst().get();
}

private void setupRolesAndPrivileges() {
    List privileges = setupData.getPrivileges();
    for (Privilege privilege : privileges) {
        setupService.setupPrivilege(privilege);
    }

    List roles = setupData.getRoles();
    for (Role role : roles) {
        setupService.setupRole(role);
    }
}

public void setupPrivilege(Privilege privilege) {
    if (privilegeRepository.findByName(privilege.getName()) == null) {
        privilegeRepository.save(privilege);
    }
}

public void setupRole(Role role) {
    if (roleRepository.findByName(role.getName()) == null) {
        Set privileges = role.getPrivileges();
        Set persistedPrivileges = new HashSet();
        for (Privilege privilege : privileges) {
            persistedPrivileges.add(privilegeRepository.findByName(privilege.getName()));
        }
        role.setPrivileges(persistedPrivileges);
        roleRepository.save(role); }
}

public List getUsers() {
    List allRoles = getRoles();
    List users = csvDataLoader.loadObjectList(User.class, SetupData.USERS_FILE);
    List usersRoles = csvDataLoader.
      loadManyToManyRelationship(SetupData.USERS_ROLES_FILE);

    for (String[] userRole : usersRoles) {
        User user = findByUserByUsername(users, userRole[0]);
        Set roles = user.getRoles();
        if (roles == null) {
            roles = new HashSet();
        }
        roles.add(findRoleByName(allRoles, userRole[1]));
        user.setRoles(roles);
    }
    return users;
}

private User findByUserByUsername(List users, String username) {
    return users.stream().
      filter(item -> item.getUsername().equals(username)).findFirst().get();
}

private void setupUsers() {
    List users = setupData.getUsers();
    for (User user : users) {
        setupService.setupUser(user);
    }
}

@Transactional
public void setupUser(User user) {
    try {
        setupUserInternal(user);
    } catch (Exception e) {
        logger.error("Error occurred while saving user " + user.toString(), e);
    }
}

private void setupUserInternal(User user) {
    if (userRepository.findByUsername(user.getUsername()) == null) {
        user.setPassword(passwordEncoder.encode(user.getPassword()));
        user.setPreference(createSimplePreference(user));
        Set roles = user.getRoles();
        Set persistedRoles = new HashSet();
        for (Role role : roles) {
            persistedRoles.add(roleRepository.findByName(role.getName()));
        }
        user.setRoles(persistedRoles);
        userRepository.save(user);
    }
}

private Preference createSimplePreference(User user) {
    Preference pref = new Preference();
    pref.setId(user.getId());
    pref.setTimezone(TimeZone.getDefault().getID());
    pref.setEmail(user.getUsername() + "@test.com");
    return preferenceRepository.save(pref);
}