/**
    * 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.hadoop.hbase.mapreduce;
  
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.OutputStream;
  
  import org.apache.hadoop.hbase.classification.InterfaceAudience;
  import org.apache.hadoop.hbase.classification.InterfaceStability;
  import org.apache.hadoop.hbase.client.Delete;
  import org.apache.hadoop.hbase.client.Mutation;
  import org.apache.hadoop.hbase.client.Put;
  import org.apache.hadoop.hbase.protobuf.ProtobufUtil;
  import org.apache.hadoop.hbase.protobuf.generated.ClientProtos;
  import org.apache.hadoop.hbase.protobuf.generated.ClientProtos.MutationProto.MutationType;
  import org.apache.hadoop.io.serializer.Deserializer;
  import org.apache.hadoop.io.serializer.Serialization;
  import org.apache.hadoop.io.serializer.Serializer;
  
  @InterfaceAudience.Public
  @InterfaceStability.Evolving
  public class MutationSerialization implements Serialization<Mutation> {
    @Override
    public boolean accept(Class<?> c) {
      return Mutation.class.isAssignableFrom(c);
    }
  
    @Override
    public Deserializer<Mutation> getDeserializer(Class<Mutation> c) {
      return new MutationDeserializer();
    }
  
    @Override
    public Serializer<Mutation> getSerializer(Class<Mutation> c) {
      return new MutationSerializer();
    }
  
    private static class MutationDeserializer implements Deserializer<Mutation> {
      private InputStream in;
  
      @Override
      public void close() throws IOException {
        in.close();
      }
  
      @Override
      public Mutation deserialize(Mutation mutation) throws IOException {
        ClientProtos.MutationProto.Builder builder = ClientProtos.MutationProto.newBuilder();
        ProtobufUtil.mergeDelimitedFrom(builder, in);
        ClientProtos.MutationProto proto = builder.build();
        return ProtobufUtil.toMutation(proto);
      }
  
      @Override
      public void open(InputStream in) throws IOException {
        this.in = in;
      }
      
    }
    private static class MutationSerializer implements Serializer<Mutation> {
      private OutputStream out;
  
      @Override
      public void close() throws IOException {
        out.close();
      }
  
      @Override
      public void open(OutputStream out) throws IOException {
        this.out = out;
      }
  
      @Override
      public void serialize(Mutation mutation) throws IOException {
        MutationType type;
        if (mutation instanceof Put) {
          type = MutationType.PUT;
        } else if (mutation instanceof Delete) {
          type = MutationType.DELETE;
        } else {
          throw new IllegalArgumentException("Only Put and Delete are supported");
        }
        ProtobufUtil.toMutation(type, mutation).writeDelimitedTo(out);
     }
   }
 }