// Copyright 2007 - Paul den Dulk (Geodan)

//

// This file is part of SharpMap.

// SharpMap is free software; you can redistribute it and/or modify

// it under the terms of the GNU Lesser General Public License as published by

// the Free Software Foundation; either version 2 of the License, or

// (at your option) any later version.

//

// SharpMap is distributed in the hope that it will be useful,

// but WITHOUT ANY WARRANTY; without even the implied warranty of

// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

// GNU Lesser General Public License for more details.

// You should have received a copy of the GNU Lesser General Public License

// along with SharpMap; if not, write to the Free Software

// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

using System;

using System.Drawing;

using System.Drawing.Imaging;

using System.Globalization;

using System.IO;

using System.Reflection;

using GeoAPI.Geometries;

namespace SharpMap.Web.Wms.Tiling

{

/// <summary>

/// Very simple implementation of ITileCache to demonstrate its functionality. It dumps all tiles as png's in a single directory.

/// </summary>

public class TileCacheFileStorage : ITileCache

{

private readonly CultureInfo _cultureInfo = new CultureInfo("en-US", false);

private readonly string _directory;

/// <summary>

/// This constructor creates the storage directory if it does not exist.

/// </summary>

/// <param name="directory">Directory where the tiles will be stored</param>

public TileCacheFileStorage(string directory)

{

_directory = directory;

if (!Directory.Exists(directory))

{

Directory.CreateDirectory(directory);

}

}

#region ITileCache Members

/// <summary>

/// Method to add a tile to the cache.

/// </summary>

/// <param name="box">The bounding <paramref name="box"/> of the area covered by the <paramref name="tile"/>.</param>

/// <param name="tile">The tile image</param>

public void AddTile(Envelope box, Bitmap tile)

{

tile.Save(GetFileName(box), ImageFormat.Png);

}

/// <summary>

/// Function to retrieve a tile from the cache that covers the provided <paramref name="box"/>.

/// </summary>

/// <param name="box">The area that is to be covered by the tile</param>

/// <returns></returns>

public Bitmap GetTile(Envelope box)

{

return new Bitmap(GetFileName(box));

}

/// <summary>

/// Function to evaluate if the cache contains a tile that covers the provided <paramref name="box"/>.

/// </summary>

/// <param name="box">The area that is to be covered by the tile</param>

/// <returns><value>true</value> if such a tile image is in the cache.</returns>

public bool ContainsTile(Envelope box)

{

return File.Exists(GetFileName(box));

}

#endregion

/// <summary>

/// Helper for convenience. Generates a directory path the Application Data directory

/// which could be used to store tiles.

/// </summary>

/// <param name="layerName">Name of the SharpMap layer</param>

/// <param name="tileSetName">Name of the TileSet</param>

/// <returns></returns>

public static string GenerateDirectoryPath(string layerName, string tileSetName)

{

var dataDir = Environment.GetEnvironmentVariable("AppData");

var appName = Assembly.GetEntryAssembly().GetName().Name;

return dataDir + "/" + appName + "/TileCache/Layer_" + layerName + "/TileSet_" + tileSetName;

}

private string GetFileName(Envelope boundingBox)

{

return String.Format("{0}/{1}_{2}_{3}_{4}.{5}", _directory,

boundingBox.Left().ToString("r", _cultureInfo), boundingBox.Top().ToString("r", _cultureInfo),

boundingBox.Right().ToString("r", _cultureInfo),

boundingBox.Bottom().ToString("r", _cultureInfo),

"png");

}

}

}