com.amazonaws.services.dynamodbv2.datamodeling.marshallers.S3LinkToStringMarshaller 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.marshallers;

import com.amazonaws.services.dynamodbv2.datamodeling.ArgumentMarshaller.StringAttributeMarshaller;
import com.amazonaws.services.dynamodbv2.datamodeling.S3Link;
import com.amazonaws.services.dynamodbv2.model.AttributeValue;

/**
 * A marshaller that marshals {@code S3Link} objects to DynamoDB Strings,
 * using a JSON encoding. For example: {"s3":{"region":"us-west-2",
 *  "bucket":"my-bucket-name", "key": "foo/bar/baz.txt"}}.
 */
public class S3LinkToStringMarshaller implements StringAttributeMarshaller {

    private static final S3LinkToStringMarshaller INSTANCE =
            new S3LinkToStringMarshaller();

    public static S3LinkToStringMarshaller instance() {
        return INSTANCE;
    }

    private S3LinkToStringMarshaller() {
    }

    @Override
    public AttributeValue marshall(Object obj) {
        S3Link s3link = (S3Link) obj;

        if ( s3link.getBucketName() == null || s3link.getKey() == null ) {
            // insufficient S3 resource specification
            return null;
        }

        return new AttributeValue().withS(s3link.toJson());
    }
}