/** * Copyright 2016 Digital Asset Holdings, LLC * * Licensed 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.hyperledger.common; import org.apache.avro.Schema; import org.apache.avro.io.*; import org.apache.avro.specific.SpecificDatumReader; import org.apache.avro.specific.SpecificDatumWriter; import org.apache.avro.specific.SpecificRecord; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.nio.ByteBuffer; import java.util.List; import java.util.function.Function; import static java.util.stream.Collectors.toList; public class AvroSerializer { public static <T extends SpecificRecord> byte[] serialize(T data) throws IOException { ByteArrayOutputStream out = new ByteArrayOutputStream(); BinaryEncoder encoder = EncoderFactory.get().binaryEncoder(out, null); DatumWriter<T> writer = new SpecificDatumWriter<>(data.getSchema()); writer.write(data, encoder); encoder.flush(); out.close(); return out.toByteArray(); } public static <T extends SpecificRecord> T deserialize(byte[] data, Schema schema) throws IOException { SpecificDatumReader<T> reader = new SpecificDatumReader<>(schema); Decoder decoder = DecoderFactory.get().binaryDecoder(data, null); return reader.read(null, decoder); } public static <T> List<ByteBuffer> toByteBufferList(List<T> list, Function<T, byte[]> encoder) { return list.stream() .map(item -> ByteBuffer.wrap(encoder.apply(item))) .collect(toList()); } public static <T> List<T> fromByteBufferList(List<ByteBuffer> list, Function<byte[], T> decoder) { return list.stream() .map(item -> decoder.apply(item.array())) .collect(toList()); } }