com.amazonaws.services.dynamodbv2.datamodeling.unmarshallers.S3LinkUnmarshaller Maven / Gradle / Ivy

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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 2014-2016 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.
 * You may obtain a copy of the License at:
 *
 *    http://aws.amazon.com/apache2.0
 *
 * 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.services.dynamodbv2.datamodeling.unmarshallers;

import com.amazonaws.services.dynamodbv2.datamodeling.S3ClientCache;
import com.amazonaws.services.dynamodbv2.datamodeling.S3Link;
import com.amazonaws.services.dynamodbv2.model.AttributeValue;

public class S3LinkUnmarshaller extends SUnmarshaller {

    private static final S3LinkUnmarshaller INSTANCE = new S3LinkUnmarshaller();

    public static S3LinkUnmarshaller instance() {
        return INSTANCE;
    }


    private final S3ClientCache clientCache;

    private S3LinkUnmarshaller() {
        this(null);
    }

    public S3LinkUnmarshaller(S3ClientCache clientCache) {
        this.clientCache = clientCache;
    }

    @Override
    public Object unmarshall(AttributeValue value) {
        if (clientCache == null) {
            throw new IllegalStateException(
                    "Mapper must be constructed with S3 AWS Credentials to "
                    + "load S3Link");
        }

        return S3Link.fromJson(clientCache, value.getS());
    }
}