/*
* Copyright 2011-2013 Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License").
* You may not use this file except in compliance with the License.
* A copy of the License is located at
*
* http://aws.amazon.com/apache2.0
*
* or in the "license" file accompanying this file. This file is distributed
* on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
* express or implied. See the License for the specific language governing
* permissions and limitations under the License.
*/
package com.amazonaws.transform;
import com.amazonaws.AmazonClientException;
import com.amazonaws.AmazonServiceException;
import com.amazonaws.util.json.JSONException;
import com.amazonaws.util.json.JSONObject;
/**
* Unmarshaller for JSON error responses from AWS services.
*/
public class JsonErrorUnmarshaller extends AbstractErrorUnmarshaller<JSONObject> {
public JsonErrorUnmarshaller() {}
protected JsonErrorUnmarshaller(Class<? extends AmazonServiceException> exceptionClass) {
super(exceptionClass);
}
public AmazonServiceException unmarshall(JSONObject json) throws Exception {
String message = parseMessage(json);
String errorCode = parseErrorCode(json);
if ((null == message || message.isEmpty()) && (null == errorCode || errorCode.isEmpty())) {
/**
* Trigger the catch block in AmazonHttpClient.handleErrorResponse to handle 413 and 503 errors
*/
throw new AmazonClientException("Neither error message nor error code is found in the error response payload.");
} else {
AmazonServiceException ase = newException(message);
ase.setErrorCode(errorCode);
return ase;
}
}
public String parseMessage(JSONObject json) throws Exception {
return parseMember("message", json);
}
public String parseMember(String key, JSONObject json) throws JSONException {
if (key == null || key.length() == 0) {
return null;
}
String firstLetterUppercaseKey;
String firstLetterLowercaseKey;
firstLetterLowercaseKey = key.substring(0, 1).toLowerCase()
+ key.substring(1);
firstLetterUppercaseKey = key.substring(0, 1).toUpperCase()
+ key.substring(1);
String value = "";
if (json.has(firstLetterUppercaseKey)) {
value = json.getString(firstLetterUppercaseKey);
} else if (json.has(firstLetterLowercaseKey)) {
value = json.getString(firstLetterLowercaseKey);
}
return value;
}
public String parseErrorCode(JSONObject json) throws Exception {
if (json.has("__type")) {
String type = json.getString("__type");
int separator = type.lastIndexOf("#");
return type.substring(separator + 1);
}
return null;
}
}