81 lines
2.9 KiB
C#
81 lines
2.9 KiB
C#
/*
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Copyright (c) Microsoft Corporation
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All rights reserved.
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Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in
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compliance with the License. You may obtain a copy of the License
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at http://www.apache.org/licenses/LICENSE-2.0
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THIS CODE IS PROVIDED *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, EITHER
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EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED WARRANTIES OR CONDITIONS OF
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TITLE, FITNESS FOR A PARTICULAR PURPOSE, MERCHANTABLITY OR NON-INFRINGEMENT.
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See the Apache Version 2.0 License for specific language governing permissions and
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limitations under the License.
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*/
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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namespace Microsoft.Research.DryadLinq
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{
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/// <summary>
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/// Defines the DryadLINQ interface for associative accumulator.
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/// </summary>
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/// <typeparam name="TAccumulate">The type of the accumulated value.</typeparam>
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public interface IAssociative<TAccumulate>
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{
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/// <summary>
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/// Provides the initial value for the accumulator.
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/// </summary>
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/// <returns>The initial value of the accumulator</returns>
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TAccumulate Seed();
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/// <summary>
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/// Combines two accumulator values into one.
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/// </summary>
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/// <param name="acc">The value of the accumulator</param>
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/// <param name="val">A value to be accumulated</param>
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/// <returns>The result of combining two accumulator values into one</returns>
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TAccumulate RecursiveAccumulate(TAccumulate acc, TAccumulate val);
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}
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/// <summary>
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/// A helper class for calling IAssociative methods more efficiently. It is used in
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/// auto-generated vertex code. A DryadLINQ user should not need to use this class directly.
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/// </summary>
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/// <typeparam name="TAssoc">The type that implements the IAssociative{T} interface</typeparam>
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/// <typeparam name="TAccumulate">The type of the accumulator value.</typeparam>
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public static class GenericAssociative<TAssoc, TAccumulate>
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where TAssoc : IAssociative<TAccumulate>, new()
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{
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private static TAssoc a = new TAssoc();
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/// <summary>
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/// Provides the initial value for the accumulator.
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/// </summary>
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/// <returns>The initial value of the accumulator</returns>
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public static TAccumulate Seed()
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{
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return a.Seed();
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}
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/// <summary>
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/// Combines two accumulator values into one.
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/// </summary>
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/// <param name="acc">The value of the accumulator</param>
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/// <param name="val">A value to be accumulated</param>
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/// <returns>The result of combining two accumulator values into one</returns>
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public static TAccumulate RecursiveAccumulate(TAccumulate acc, TAccumulate val)
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{
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return a.RecursiveAccumulate(acc, val);
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}
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}
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}
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