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package com.twitter.elephantbird.mapreduce.io;

import com.google.protobuf.Message;
import com.twitter.elephantbird.util.TypeRef;

/**
 * A Hadoop Writable wrapper around a protocol buffer of type M.
 */

public class ProtobufWritable extends BinaryWritable {

  public ProtobufWritable() {
    super(null, null);
  }

  public ProtobufWritable(TypeRef typeRef) {
    this(null, typeRef);
  }

  public ProtobufWritable(M message, TypeRef typeRef) {
    super(message, new ProtobufConverter(typeRef));
  }

  /**
   * Returns a ProtobufWritable for a given Protobuf class.
   */
  public static  ProtobufWritable newInstance(Class tClass) {
    return new ProtobufWritable(new TypeRef(tClass){});
  }

  @Override
  protected BinaryConverter getConverterFor(Class clazz) {
    return ProtobufConverter.newInstance(clazz);
  }
}