/**
    * 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.DataInputStream;
  import java.io.DataOutputStream;
  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.KeyValue;
  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 KeyValueSerialization implements Serialization<KeyValue> {
    @Override
    public boolean accept(Class<?> c) {
      return KeyValue.class.isAssignableFrom(c);
    }
  
    @Override
    public KeyValueDeserializer getDeserializer(Class<KeyValue> t) {
      return new KeyValueDeserializer();
    }
  
    @Override
    public KeyValueSerializer getSerializer(Class<KeyValue> c) {
      return new KeyValueSerializer();
    }
  
    public static class KeyValueDeserializer implements Deserializer<KeyValue> {
      private DataInputStream dis;
  
      @Override
      public void close() throws IOException {
        this.dis.close();
      }
  
      @Override
      public KeyValue deserialize(KeyValue ignore) throws IOException {
        // I can't overwrite the passed in KV, not from a proto kv, not just yet.  TODO
        return KeyValue.create(this.dis);
      }
  
      @Override
      public void open(InputStream is) throws IOException {
        this.dis = new DataInputStream(is);
      }
    }
  
    public static class KeyValueSerializer implements Serializer<KeyValue> {
      private DataOutputStream dos;
  
      @Override
      public void close() throws IOException {
        this.dos.close();
      }
  
      @Override
      public void open(OutputStream os) throws IOException {
        this.dos = new DataOutputStream(os);
      }
  
      @Override
      public void serialize(KeyValue kv) throws IOException {
        KeyValue.write(kv, this.dos);
      }
    }
  }