lang/cs/Org.Apache.REEF.IMRU.Examples/NaturalSum/NaturalSumMapFunction.cs

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// to you under the Apache License, Version 2.0 (the
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// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
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using Org.Apache.REEF.IMRU.API;
using Org.Apache.REEF.Tang.Annotations;

namespace Org.Apache.REEF.IMRU.Examples.NaturalSum
{
    /// <summary>
    /// Map function that returns its mapper id as output.
    /// </summary>
    internal sealed class NaturalSumMapFunction : IMapFunction<int, int>
    {
        private readonly int _mapperId;

        [Inject]
        private NaturalSumMapFunction([Parameter(typeof(NaturalSumPerMapperConfigGenerator.MapperId))] int mapperId)
        {
            _mapperId = mapperId;
        }

        /// <summary>
        /// Map function that ignores the input and returns this mapper's id as output
        /// </summary>
        /// <param name="mapInput">input given from the Update function, but is not used</param>
        /// <returns>id of this mapper</returns>
        public int Map(int mapInput)
        {
            return _mapperId;
        }
    }
}