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namespace GMap.NET
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{
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   using System.IO;
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   using System;
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   /// <summary>
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   /// pure abstraction for image cache
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   /// </summary>
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   public interface PureImageCache
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   {
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      /// <summary>
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      /// puts image to db
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      /// </summary>
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      /// <param name="tile"></param>
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      /// <param name="type"></param>
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      /// <param name="pos"></param>
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      /// <param name="zoom"></param>
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      /// <returns></returns>
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      bool PutImageToCache(byte[] tile, int type, GPoint pos, int zoom);
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      /// <summary>
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      /// gets image from db
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      /// </summary>
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      /// <param name="type"></param>
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      /// <param name="pos"></param>
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      /// <param name="zoom"></param>
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      /// <returns></returns>
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      PureImage GetImageFromCache(int type, GPoint pos, int zoom);
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      /// <summary>
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      /// delete old tiles beyond a supplied date
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      /// </summary>
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      /// <param name="date">Tiles older than this will be deleted.</param>
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      /// <param name="type">provider dbid or null to use all providers</param>
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      /// <returns>The number of deleted tiles.</returns>
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      int DeleteOlderThan(DateTime date, int ? type);
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   }
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}