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| Code Block |
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| language | java |
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| title | gson example |
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| linenumbers | true |
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| collapse | true |
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|
private synchronized void reloadUsers() {
Map<String, AAIUser> tempUsers = new HashMap<>();
try {
LOGGER.debug("Reading from " + globalAuthFileName);
String authFile = new String(Files.readAllBytes(Paths.get(globalAuthFileName)));
JsonParser parser = new JsonParser();
JsonObject authObject = parser.parse(authFile).getAsJsonObject();
if (authObject.has("roles")) {
JsonArray roles = authObject.getAsJsonArray("roles");
for (JsonElement role : roles) {
if (role.isJsonObject()) {
JsonObject roleObject = role.getAsJsonObject();
String roleName = roleObject.get("name").getAsString();
Map<String, Boolean> usrs = this.getUsernamesFromRole(roleObject);
List<String> aaiFunctions = this.getAAIFunctions(roleObject);
usrs.forEach((key, value) -> {
final AAIUser au = tempUsers.getOrDefault(key, new AAIUser(key, value));
au.addRole(roleName);
aaiFunctions.forEach(f -> {
List<String> httpMethods = this.getRoleHttpMethods(f, roleObject);
httpMethods.forEach(hm -> au.setUserAccess(f, hm));
this.validFunctions.add(f);
});
tempUsers.put(key, au);
});
}
}
if (!tempUsers.isEmpty()) {
users = tempUsers;
}
}
} catch (FileNotFoundException e) {
ErrorLogHelper.logError("AAI_4001", globalAuthFileName + ". Exception: " + e);
} catch (JsonProcessingException e) {
ErrorLogHelper.logError("AAI_4001", globalAuthFileName + ". Not valid JSON: " + e);
} catch (Exception e) {
ErrorLogHelper.logError("AAI_4001", globalAuthFileName + ". Exception caught: " + e);
}
} |
Side-by-side comparison
| FasterXML Jackson version | Google gson version | Comments |
|---|
| Code Block |
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mapper = new ObjectMapper(); |
| | Code Block |
|---|
JsonParser parser = new JsonParser(); |
|
|
| Code Block |
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JsonNode rootNode = mapper.readTree(new File(authFilename));
JsonNode rolesNode = rootNode.path(AuthConstants.ROLES_NODE_PATH); |
| | Code Block |
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JsonObject authObject = parser.parse(authFile).getAsJsonObject();
JsonArray roles = authObject.getAsJsonArray("roles"); |
|
|
| Code Block |
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String function = functionNode.path(AuthConstants.FUNCTION_NAME_PATH).asText(); |
| | Code Block |
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String roleName = roleObject.get("name").getAsString(); |
| Code structure differs at this point (function name vs role name) but the general intent of the code is equivalent (get the element name as a string). |
| Code Block |
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(no exception handling in this method) |
| | Code Block |
|---|
} catch (JsonProcessingException e) {
ErrorLogHelper.logError("AAI_4001", globalAuthFileName + ". Not valid JSON: " + e); |
| For some reason, this version still catches com.fasterxml.jackson.core.JsonProcessingException even though it uses Google gson for parsing. |
Suggestions
Article https://blog.takipi.com/the-ultimate-json-library-json-simple-vs-gson-vs-jackson-vs-json/
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