我是Java 8 Optional的新手。我需要修改以下代码:
@RequestMapping(value = "/account",
method = RequestMethod.GET,
produces = MediaType.APPLICATION_JSON_VALUE)
public ResponseEntity<UserDTO> getAccount() {
return
Optional.ofNullable(userService.getUserWithAuthorities())
.map(user ->
new ResponseEntity<>(
new UserDTO(
user.getLogin(),
null,
user.getFirstName(),
user.getLastName(),
user.getEmail(),
"",
user.getLangKey(),
user.getAuthorities()
.stream()
.map(Authority::getName)
.collect(Collectors.toList())
),
HttpStatus.OK
)
)
.orElse(new ResponseEntity<>(HttpStatus.INTERNAL_SERVER_ERROR));
}
我希望根据user
的实例创建不同的ResponseEntity。以下是等价代码:
if(user instanceof Admin )
{
// my logic
}
else if(user instanceof NormalUser)
{
// my logic
}
谢谢