| /* |
| * 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.SimpleTypeSerializerSnapshot; |
| import org.apache.flink.api.common.typeutils.TypeSerializerSnapshot; |
| import org.apache.flink.core.memory.DataInputView; |
| import org.apache.flink.core.memory.DataOutputView; |
| |
| import java.io.IOException; |
| |
| /** |
| * Serializer for {@code Void}. |
| */ |
| @Internal |
| public final class VoidSerializer extends TypeSerializerSingleton<Void> { |
| |
| private static final long serialVersionUID = 1L; |
| |
| /** Sharable instance of the VoidSerializer. */ |
| public static final VoidSerializer INSTANCE = new VoidSerializer(); |
| |
| @Override |
| public boolean isImmutableType() { |
| return true; |
| } |
| |
| @Override |
| public Void createInstance() { |
| return null; |
| } |
| |
| @Override |
| public Void copy(Void from) { |
| return null; |
| } |
| |
| @Override |
| public Void copy(Void from, Void reuse) { |
| return null; |
| } |
| |
| @Override |
| public int getLength() { |
| return 1; |
| } |
| |
| @Override |
| public void serialize(Void record, DataOutputView target) throws IOException { |
| // make progress in the stream, write one byte |
| target.write(0); |
| } |
| |
| @Override |
| public Void deserialize(DataInputView source) throws IOException { |
| source.readByte(); |
| return null; |
| } |
| |
| @Override |
| public Void deserialize(Void reuse, DataInputView source) throws IOException { |
| source.readByte(); |
| return null; |
| } |
| |
| @Override |
| public void copy(DataInputView source, DataOutputView target) throws IOException { |
| target.write(source.readByte()); |
| } |
| |
| @Override |
| public boolean canEqual(Object obj) { |
| return obj instanceof VoidSerializer; |
| } |
| |
| @Override |
| public TypeSerializerSnapshot<Void> snapshotConfiguration() { |
| return new VoidSerializerSnapshot(); |
| } |
| |
| // ------------------------------------------------------------------------ |
| |
| /** |
| * Serializer configuration snapshot for compatibility and format evolution. |
| */ |
| @SuppressWarnings("WeakerAccess") |
| public static final class VoidSerializerSnapshot extends SimpleTypeSerializerSnapshot<Void> { |
| |
| public VoidSerializerSnapshot() { |
| super(() -> INSTANCE); |
| } |
| } |
| } |