flink-core/src/main/java/org/apache/flink/api/java/typeutils/runtime/EitherSerializerConfigSnapshot.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 */

package org.apache.flink.api.java.typeutils.runtime;

import org.apache.flink.annotation.Internal;
import org.apache.flink.api.common.typeutils.CompositeTypeSerializerConfigSnapshot;
import org.apache.flink.api.common.typeutils.CompositeTypeSerializerUtil;
import org.apache.flink.api.common.typeutils.TypeSerializer;
import org.apache.flink.api.common.typeutils.TypeSerializerSchemaCompatibility;
import org.apache.flink.api.common.typeutils.TypeSerializerSnapshot;
import org.apache.flink.api.java.tuple.Tuple2;
import org.apache.flink.types.Either;

import java.util.List;

/**
 * Deprecated config snapshot retained for savepoint compatibility with Flink 1.6 and earlier.
 */
@Deprecated
@Internal
public final class EitherSerializerConfigSnapshot<L, R> extends CompositeTypeSerializerConfigSnapshot<Either<L, R>> {

	private static final int VERSION = 1;

	/** This empty nullary constructor is required for deserializing the configuration. */
	@SuppressWarnings("unused")
	public EitherSerializerConfigSnapshot() {}

	@Override
	public int getVersion() {
		return VERSION;
	}

	@Override
	@SuppressWarnings("unchecked")
	public TypeSerializerSchemaCompatibility<Either<L, R>> resolveSchemaCompatibility(
			TypeSerializer<Either<L, R>> newSerializer) {

		// this class was shared between the Java Either Serializer and the
		// Scala Either serializer
		if (newSerializer.getClass() == EitherSerializer.class) {
			List<Tuple2<TypeSerializer<?>, TypeSerializerSnapshot<?>>> nestedSerializersAndConfigs = getNestedSerializersAndConfigs();
			return CompositeTypeSerializerUtil.delegateCompatibilityCheckToNewSnapshot(
				newSerializer,
				new JavaEitherSerializerSnapshot<>(),
				nestedSerializersAndConfigs.get(0).f1,
				nestedSerializersAndConfigs.get(1).f1);
		}
		else {
			// fall back to the backwards compatibility path
			return super.resolveSchemaCompatibility(newSerializer);
		}
	}
}