flink-core/src/main/java/org/apache/flink/api/common/typeutils/base/CollectionSerializerConfigSnapshot.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.common.typeutils.base;

import org.apache.flink.annotation.Internal;
import org.apache.flink.api.common.typeutils.CompositeTypeSerializerConfigSnapshot;
import org.apache.flink.api.common.typeutils.CompositeTypeSerializerSnapshot;
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 java.util.Collection;

/**
 * Configuration snapshot of a serializer for collection types.
 *
 * @param <T> Type of the element.
 *
 * @deprecated this snapshot class should no longer be used by any serializers as their snapshot.
 */
@Internal
@Deprecated
public final class CollectionSerializerConfigSnapshot<C extends Collection<T>, T>
		extends CompositeTypeSerializerConfigSnapshot<C> {

	private static final int VERSION = 1;

	/** This empty nullary constructor is required for deserializing the configuration. */
	public CollectionSerializerConfigSnapshot() {}

	public CollectionSerializerConfigSnapshot(TypeSerializer<T> elementSerializer) {
		super(elementSerializer);
	}

	@Override
	@SuppressWarnings("unchecked")
	public TypeSerializerSchemaCompatibility<C> resolveSchemaCompatibility(TypeSerializer<C> newSerializer) {
		if (!(newSerializer instanceof ListSerializer)) {
			return super.resolveSchemaCompatibility(newSerializer);
		}

		return CompositeTypeSerializerUtil.delegateCompatibilityCheckToNewSnapshot(
			newSerializer,
			(CompositeTypeSerializerSnapshot<C, ? extends TypeSerializer>) new ListSerializerSnapshot<>(),
			getSingleNestedSerializerAndConfig().f1);
	}

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