| /* |
| * 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; |
| |
| import java.util.Arrays; |
| |
| /** |
| * Utilities for dealing with the {@link TypeSerializer} and the {@link TypeSerializerSnapshot}. |
| */ |
| public final class TypeSerializerUtils { |
| |
| /** |
| * Takes config snapshots of the given serializers. In case where the config snapshots |
| * are still extending the old {@code TypeSerializerConfigSnapshot} class, the snapshots |
| * are set up properly (with their originating serializer) such that the backwards |
| * compatible code paths work. |
| */ |
| public static TypeSerializerSnapshot<?>[] snapshotBackwardsCompatible( |
| TypeSerializer<?>... originatingSerializers) { |
| |
| return Arrays.stream(originatingSerializers) |
| .map((s) -> configureForBackwardsCompatibility(s.snapshotConfiguration(), s)) |
| .toArray(TypeSerializerSnapshot[]::new); |
| } |
| |
| /** |
| * Utility method to bind the serializer and serializer snapshot to a common |
| * generic type variable. |
| */ |
| @SuppressWarnings({"unchecked", "deprecation"}) |
| private static <T> TypeSerializerSnapshot<T> configureForBackwardsCompatibility( |
| TypeSerializerSnapshot<?> snapshot, |
| TypeSerializer<?> serializer) { |
| |
| TypeSerializerSnapshot<T> typedSnapshot = (TypeSerializerSnapshot<T>) snapshot; |
| TypeSerializer<T> typedSerializer = (TypeSerializer<T>) serializer; |
| |
| if (snapshot instanceof TypeSerializerConfigSnapshot) { |
| ((TypeSerializerConfigSnapshot<T>) typedSnapshot).setPriorSerializer(typedSerializer); |
| } |
| |
| return typedSnapshot; |
| } |
| |
| // ------------------------------------------------------------------------ |
| |
| /** This class is not meanto to be instantiated. */ |
| private TypeSerializerUtils() {} |
| } |