I've already have a look at the question "Jackson dynamic property names" but it does not really answer to my question.
I want to deserialize something like this :
public class Response<T> {
private String status;
private Error error;
private T data;
}
but data can have different names since different services exist and return the same structure with some different data. For example 'user' and 'contract' :
{
response: {
status: "success",
user: {
...
}
}
}
or
{
response: {
status: "failure",
error : {
code : 212,
message : "Unable to retrieve contract"
}
contract: {
...
}
}
}
I'd like genericize my responses objects like this :
public class UserResponse extends Response<User> {}
I've tried the following but i'm not sure it is my use case or if don't use it in the good way :
@JsonTypeInfo(include = As.WRAPPER_OBJECT, use = Id.CLASS)
@JsonSubTypes({@Type(value = User.class, name = "user"),
@Type(value = Contract.class, name = "contract")})
Finally, i've created a custom Deserializer. It works but i'm not satisfied:
public class ResponseDeserializer extends JsonDeserializer<Response> {
@Override
public Response deserialize(JsonParser jp, DeserializationContext ctxt) throws IOException {
ObjectMapper mapper = new ObjectMapper();
Response responseData = new Response();
Object data = null;
for (; jp.getCurrentToken() != JsonToken.END_OBJECT; jp.nextToken()) {
String propName = jp.getCurrentName();
// Skip field name:
jp.nextToken();
if ("contract".equals(propName)) {
data = mapper.readValue(jp, Contract.class);
} else if ("user".equals(propName)) {
data = mapper.readValue(jp, User.class);
} else if ("status".equals(propName)) {
responseData.setStatus(jp.getText());
} else if ("error".equals(propName)) {
responseData.setError(mapper.readValue(jp, com.ingdirect.dg.business.object.community.api.common.Error.class));
}
}
if (data instanceof Contract) {
Response<Contract> response = new Response<Ranking>(responseData);
return response;
}
if (data instanceof User) {
Response<User> response = new Response<User>(responseData);
return response;
}
// in all other cases, the type is not yet managed, add it when needed
throw new JsonParseException("Cannot parse this Response", jp.getCurrentLocation());
}
}
Any idea to do this clean with annotations ? Thanks in advance !