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The AWS Java SDK for Amazon DynamoDB module holds the client classes that are used for communicating with Amazon DynamoDB Service

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/*
 * Copyright 2014-2020 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.DynamoDBMappingException;
import com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBMarshaller;
import com.amazonaws.services.dynamodbv2.model.AttributeValue;

/**
 * A marshaller that delegates to an instance of a
 * {@code DynamoDBMarshalling}-derived custom marshaler.
 */
public class CustomMarshaller implements StringAttributeMarshaller {

    private final Class> marshallerClass;

    public CustomMarshaller(
            Class> marshallerClass) {

        this.marshallerClass = marshallerClass;
    }

    @Override
    public AttributeValue marshall(Object obj) {

        // TODO: Would be nice to cache this object, but not sure if we can
        // do that now without a breaking change; user's marshalers might
        // not all be thread-safe.

        DynamoDBMarshaller