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The AWS SDK for Java with support for OSGi. The AWS SDK for Java provides Java APIs for building software on AWS' cost-effective, scalable, and reliable infrastructure products. The AWS Java SDK allows developers to code against APIs for all of Amazon's infrastructure web services (Amazon S3, Amazon EC2, Amazon SQS, Amazon Relational Database Service, Amazon AutoScaling, etc).

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/*
 * Copyright 2015-2016 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.AmazonServiceException;
import com.amazonaws.annotation.SdkInternalApi;
import com.amazonaws.annotation.ThreadSafe;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.PropertyNamingStrategy.PascalCaseStrategy;

/**
 * Unmarshaller for JSON error responses from AWS services.
 */
@SdkInternalApi
@ThreadSafe
public class JsonErrorUnmarshaller extends AbstractErrorUnmarshaller {

    public static final JsonErrorUnmarshaller DEFAULT_UNMARSHALLER = new JsonErrorUnmarshaller(
            AmazonServiceException.class, null);

    private static final ObjectMapper MAPPER = new ObjectMapper().configure(
            DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false).setPropertyNamingStrategy(
            new PascalCaseStrategy());

    private final String handledErrorCode;

    /**
     * @param exceptionClass
     *            Exception class this unmarshaller will attempt to deserialize error response into
     * @param handledErrorCode
     *            AWS error code that this unmarshaller handles. Pass null to handle all exceptions
     */
    public JsonErrorUnmarshaller(Class exceptionClass, String handledErrorCode) {
        super(exceptionClass);
        this.handledErrorCode = handledErrorCode;
    }

    @Override
    public AmazonServiceException unmarshall(JsonNode jsonContent) throws Exception {
        return MAPPER.treeToValue(jsonContent, exceptionClass);
    }

    /**
     * @param actualErrorCode
     *            Actual AWS error code found in the error response.
     * @return True if the actualErrorCode can be handled by this unmarshaller, false otherwise
     */
    public boolean matchErrorCode(String actualErrorCode) {
        if (handledErrorCode == null) {
            return true;
        }
        return handledErrorCode.equals(actualErrorCode);
    }

}