/**
* Converts object to JSON.
*
* @param o object to convert.
* @return {@link JsonNode}
*/
public static JsonNode objectToJson(Object o) {
ObjectMapper mapper = new ObjectMapper();
try {
return mapper.valueToTree(o);
} catch (Exception e) {
log.error(String.format("JsonUtils.objectToJson(): Unable to write json"));
}
return null;
}
/**
* Convenience method for creating an error response
*
* @param jsonRpc the jsonrpc string
* @param id the id
* @param code the error code
* @param message the error message
* @param data the error data (if any)
* @return the error response
*/
private ObjectNode createErrorResponse(
String jsonRpc, String id, int code, String message, Object data) {
ObjectNode response = mapper.createObjectNode();
ObjectNode error = mapper.createObjectNode();
error.put("code", code);
error.put("message", message);
if (data != null) {
error.put("data", mapper.valueToTree(data));
}
response.put("jsonrpc", jsonRpc);
response.put("id", id);
response.put("error", error);
return response;
}
/**
* Invokes the given method on the {@code handler} passing the given params (after converting them
* to beans\objects) to it.
*
* @param m the method to invoke
* @param params the params to pass to the method
* @return the return value (or null if no return)
* @throws JsonParseException
* @throws JsonMappingException
* @throws IOException
* @throws IllegalArgumentException
* @throws IllegalAccessException
* @throws InvocationTargetException
*/
private JsonNode invoke(Method m, List<JsonNode> params)
throws JsonParseException, JsonMappingException, IOException, IllegalArgumentException,
IllegalAccessException, InvocationTargetException {
// convert the parameters
Object[] convertedParams = new Object[params.size()];
Type[] parameterTypes = m.getGenericParameterTypes();
for (int i = 0; i < parameterTypes.length; i++) {
convertedParams[i] =
mapper.treeToValue(params.get(i), TypeFactory.type(parameterTypes[i]).getRawClass());
}
// invoke the method
Object result = m.invoke(handler, convertedParams);
return (m.getGenericReturnType() != null) ? mapper.valueToTree(result) : null;
}
@Override
public void render(Map<String, ?> map, HttpServletRequest req, HttpServletResponse resp)
throws Exception {
AnnotationIntrospector introspector = new JaxbAnnotationIntrospector();
mapper.getDeserializationConfig().setAnnotationIntrospector(introspector);
mapper.getSerializationConfig().setAnnotationIntrospector(introspector);
// resp.setHeader("Content-Type", "text/html; charset=UTF-8"); // "application/json");
JsonGenerator generator =
mapper.getJsonFactory().createJsonGenerator(resp.getOutputStream(), JsonEncoding.UTF8);
ObjectNode json = mapper.valueToTree(map);
// json.put("success", true);
mapper.writeTree(generator, json);
// mapper.writeValue(generator, ret);
generator.flush();
}
