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// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
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//
//   http://www.apache.org/licenses/LICENSE-2.0
//
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using System.IO;
using Microsoft.Hadoop.Avro;
using Org.Apache.REEF.Utilities.Attributes;

/// <summary>
/// This copy of AvroUtils should belong to O.A.R.Utilities
/// As per the discussion on https://issues.apache.org/jira/browse/REEF-1570
/// we are in-lining this here temporarily
/// </summary>
namespace Org.Apache.REEF.Examples.MachineLearning.KMeans.codecs
{
    [Private, TemporaryFix]
    public static class AvroUtils
    {
        /// <summary>
        /// Convert an object to byte array using Avro serialization
        /// </summary>
        /// <param name="obj">The object to serialize</param>
        /// <returns>The serialized object in a byte array</returns>
        public static byte[] AvroSerialize<T>(T obj)
        {
            IAvroSerializer<T> serializer = AvroSerializer.Create<T>();
            using (MemoryStream stream = new MemoryStream())
            {
                serializer.Serialize(stream, obj);
                return stream.GetBuffer();
            }
        }

        /// <summary>
        /// Converts a byte array to an object using Avro deserialization.
        /// </summary>
        /// <param name="data">The byte array to deserialize</param>
        /// <returns>The deserialized object</returns>
        public static T AvroDeserialize<T>(byte[] data)
        {
            IAvroSerializer<T> deserializer = AvroSerializer.Create<T>();
            using (MemoryStream stream = new MemoryStream(data))
            {
                return deserializer.Deserialize(stream);
            }
        }
    }
}