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The Athena Query Federation SDK defines a set of interfaces and wire protocols that you can implement to enable Athena to delegate portions of it's query execution plan to code that you deploy/write.

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/*-
 * #%L
 * Amazon Athena Query Federation SDK
 * %%
 * Copyright (C) 2019 - 2020 Amazon Web Services
 * %%
 * 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://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License 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.
 * #L%
 */
package com.amazonaws.athena.connector.lambda.serde;

import com.amazonaws.athena.connector.lambda.data.BlockAllocator;
import com.amazonaws.athena.connector.lambda.handlers.SerDeVersion;
import com.amazonaws.athena.connector.lambda.serde.v2.ObjectMapperFactoryV2;
import com.amazonaws.athena.connector.lambda.serde.v3.ObjectMapperFactoryV3;
import com.amazonaws.athena.connector.lambda.serde.v4.ObjectMapperFactoryV4;
import com.fasterxml.jackson.databind.ObjectMapper;

/**
 * Vends {@link ObjectMapper} instances that correspond to SerDe versions.
 */
public class VersionedObjectMapperFactory
{
    private VersionedObjectMapperFactory() {}

    /**
     * Creates an {@link ObjectMapper} using the current SDK SerDe version.
     *
     * @param allocator
     * @return
     */
    public static ObjectMapper create(BlockAllocator allocator)
    {
        return create(allocator, SerDeVersion.SERDE_VERSION);
    }

    /**
     * Creates an {@link ObjectMapper} using the provided SerDe version.
     *
     * @param allocator
     * @param version
     * @return
     */
    public static ObjectMapper create(BlockAllocator allocator, int version)
    {
        switch (version) {
            case 1:
                return ObjectMapperFactory.create(allocator);
            case 2:
                return ObjectMapperFactoryV2.create(allocator);
            case 3:
                return ObjectMapperFactoryV3.create(allocator);
            case 4:
                return ObjectMapperFactoryV4.create(allocator);
            default:
                throw new IllegalArgumentException("No serde version " + version);
        }
    }
}