flink-libraries/flink-table/src/main/java/org/apache/flink/table/typeutils/BinaryMapSerializer.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.table.typeutils;

import org.apache.flink.api.common.typeutils.base.TypeSerializerSingleton;
import org.apache.flink.core.memory.DataInputView;
import org.apache.flink.core.memory.DataOutputView;
import org.apache.flink.core.memory.MemorySegmentFactory;
import org.apache.flink.table.dataformat.BinaryMap;

import java.io.IOException;

/**
 * Serializer for {@link BinaryMap}.
 */
public class BinaryMapSerializer extends TypeSerializerSingleton<BinaryMap> {

	public static final BinaryMapSerializer INSTANCE = new BinaryMapSerializer();

	private BinaryMapSerializer() {}

	@Override
	public boolean isImmutableType() {
		return false;
	}

	@Override
	public BinaryMap createInstance() {
		return new BinaryMap();
	}

	@Override
	public BinaryMap copy(BinaryMap from) {
		return from.copy();
	}

	@Override
	public BinaryMap copy(BinaryMap from, BinaryMap reuse) {
		return from.copy(reuse);
	}

	@Override
	public int getLength() {
		return -1;
	}

	@Override
	public void serialize(BinaryMap record, DataOutputView target) throws IOException {
		byte[] bytes = record.getBytes();
		target.write(bytes.length);
		target.write(bytes);
	}

	@Override
	public BinaryMap deserialize(DataInputView source) throws IOException {
		return deserialize(new BinaryMap(), source);
	}

	@Override
	public BinaryMap deserialize(BinaryMap reuse, DataInputView source) throws IOException {
		int length = source.readInt();
		byte[] bytes = new byte[length];
		source.readFully(bytes);
		reuse.pointTo(MemorySegmentFactory.wrap(bytes), 0, bytes.length);
		return reuse;
	}

	@Override
	public void copy(DataInputView source, DataOutputView target) throws IOException {
		int length = source.readInt();
		byte[] bytes = new byte[length];
		source.readFully(bytes);
		target.write(bytes);
	}

	@Override
	public boolean canEqual(Object obj) {
		return obj instanceof BinaryMapSerializer;
	}
}