/Main/src/DynamicDataDisplay.Maps/Servers/ResourcesServers/ResourcesTileServer.cs

  1using System;
  2using System.Collections.Generic;
  3using System.Linq;
  4using System.Text;
  5using Microsoft.Research.DynamicDataDisplay.Charts.Maps;
  6using System.Reflection;
  7using System.Windows.Media.Imaging;
  8using System.IO;
  9using System.Diagnostics;
 10
 11namespace Microsoft.Research.DynamicDataDisplay.Maps.Servers
 12{
 13	public abstract class ResourcesTileServer : ITileServer
 14	{
 15		private const string prefix = "Microsoft.Research.DynamicDataDisplay.Maps.Tiles";
 16
 17		private static readonly Assembly currentAssembly;
 18		private static readonly string[] resourceNames;
 19		static ResourcesTileServer()
 20		{
 21			currentAssembly = typeof(ResourcesTileServer).Assembly;
 22			resourceNames = currentAssembly.GetManifestResourceNames();
 23		}
 24
 25		private int minLevel = 1;
 26		private int maxLevel = 2;
 27
 28		#region ITileServer Members
 29
 30		public bool Contains(TileIndex id)
 31		{
 32			return (minLevel <= id.Level && id.Level <= maxLevel);
 33		}
 34
 35		private string currentPrefix;
 36		public void BeginLoadImage(TileIndex id)
 37		{
 38			BitmapImage bmp = new BitmapImage();
 39			string resourceName = CreateResourceName(id);
 40			using (Stream stream = currentAssembly.GetManifestResourceStream(resourceName))
 41			{
 42				if (stream == null)
 43				{
 44					ReportFailure(id);
 45					return;
 46				}
 47
 48				bmp.BeginInit();
 49				bmp.StreamSource = stream;
 50				bmp.CacheOption = BitmapCacheOption.OnLoad;
 51				bmp.EndInit();
 52				if (bmp.IsDownloading) { }
 53			}
 54
 55			ReportSuccess(bmp, id);
 56		}
 57
 58		protected void ReportSuccess(BitmapImage bmp, TileIndex id)
 59		{
 60			Debug.WriteLine(String.Format("{0}: loaded id = {1}", ServerName, id));
 61			RaiseDataLoaded(new TileLoadResultEventArgs
 62			{
 63				Image = bmp,
 64				Result = TileLoadResult.Success,
 65				ID = id
 66			});
 67		}
 68
 69		protected void ReportFailure(TileIndex id)
 70		{
 71			Debug.WriteLine(String.Format("{0}: failed id = {1}", ServerName, id));
 72			RaiseDataLoaded(new TileLoadResultEventArgs
 73			{
 74				Image = null,
 75				ID = id,
 76				Result = TileLoadResult.Failure
 77			});
 78		}
 79
 80
 81		private string CreateResourceName(TileIndex id)
 82		{
 83			StringBuilder builder = new StringBuilder(currentPrefix);
 84			builder = builder.Append(id.Level).Append(".").Append(id.X).Append("x")
 85				.Append(id.Y).Append(fileExtension);
 86
 87			return builder.ToString();
 88		}
 89
 90		private void RaiseDataLoaded(TileLoadResultEventArgs args)
 91		{
 92			ImageLoaded.Raise(this, args);
 93		}
 94		public event EventHandler<TileLoadResultEventArgs> ImageLoaded;
 95
 96		private string name = "Resource tile server";
 97		public string ServerName
 98		{
 99			get { return name; }
100			protected set
101			{
102				name = value;
103				currentPrefix = prefix + "." + name + ".z";
104			}
105		}
106
107		private string fileExtension = ".png";
108		public string FileExtension
109		{
110			get { return fileExtension; }
111			set { fileExtension = value; }
112		}
113
114		#endregion
115
116		#region ITileServer Members
117
118		protected void RaiseChangedEvent()
119		{
120			Changed.Raise(this);
121		}
122		public event EventHandler Changed;
123
124		#endregion
125	}
126}