[12762] | 1 | using System;
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| 2 | using System.IO;
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| 3 | using System.Net;
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| 4 | using System.Xml;
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| 5 | using System.Diagnostics;
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| 6 |
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| 7 | using SharpVectors.Net;
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| 8 |
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| 9 | namespace SharpVectors.Renderers.Utils
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| 10 | {
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| 11 | public sealed class WpfCacheManager : ICacheManager
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| 12 | {
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| 13 | private XmlElement lastCacheElm;
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| 14 | private Uri lastUri;
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| 15 |
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| 16 | private string cacheDir;
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| 17 | private string cacheDocPath;
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| 18 | private XmlDocument cacheDoc = new XmlDocument();
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| 19 |
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| 20 | public WpfCacheManager()
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| 21 | {
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| 22 | cacheDoc = new XmlDocument();
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| 23 |
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| 24 | cacheDir = Path.Combine(WpfApplicationContext.ExecutableDirectory.FullName, "cache/");
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| 25 | cacheDocPath = Path.Combine(cacheDir, "cache.xml");
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| 26 |
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| 27 | LoadDoc();
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| 28 | }
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| 29 |
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| 30 | public WpfCacheManager(string cacheDir)
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| 31 | {
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| 32 | cacheDoc = new XmlDocument();
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| 33 |
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| 34 | this.cacheDir = Path.Combine(
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| 35 | WpfApplicationContext.ExecutableDirectory.FullName,
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| 36 | cacheDir);
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| 37 |
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| 38 | cacheDocPath = Path.Combine(cacheDir, "cache.xml");
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| 39 |
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| 40 | LoadDoc();
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| 41 | }
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| 42 |
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| 43 | private void LoadDoc()
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| 44 | {
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| 45 | if (cacheDoc == null)
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| 46 | {
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| 47 | cacheDoc = new XmlDocument();
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| 48 | }
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| 49 |
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| 50 | if(File.Exists(cacheDocPath))
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| 51 | {
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| 52 | cacheDoc.Load(cacheDocPath);
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| 53 | }
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| 54 | else
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| 55 | {
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| 56 | Directory.CreateDirectory(Directory.GetParent(cacheDocPath).FullName);
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| 57 | cacheDoc.LoadXml("<cache />");
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| 58 | }
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| 59 | }
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| 60 |
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| 61 | private void SaveDoc()
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| 62 | {
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| 63 | if (cacheDoc == null)
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| 64 | {
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| 65 | return;
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| 66 | }
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| 67 | cacheDoc.Save(cacheDocPath);
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| 68 | }
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| 69 |
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| 70 | private XmlElement GetCacheElm(Uri uri)
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| 71 | {
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| 72 | if(uri == lastUri && lastCacheElm != null)
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| 73 | {
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| 74 | return lastCacheElm;
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| 75 | }
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| 76 | else
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| 77 | {
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| 78 | //string xpath = "/cache/resource[@url='" + uri.ToString() + "']";
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| 79 | string xpath = "/cache/resource[@url='" + uri.ToString().Replace("'", "'") + "']";
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| 80 | XmlNode node = cacheDoc.SelectSingleNode(xpath);
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| 81 | if(node != null)
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| 82 | {
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| 83 | lastCacheElm = node as XmlElement;
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| 84 | }
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| 85 | else
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| 86 | {
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| 87 | lastCacheElm = cacheDoc.CreateElement("resource");
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| 88 | cacheDoc.DocumentElement.AppendChild(lastCacheElm);
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| 89 | lastCacheElm.SetAttribute("url", uri.ToString());
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| 90 | }
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| 91 |
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| 92 | lastUri = uri;
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| 93 | return lastCacheElm;
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| 94 | }
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| 95 | }
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| 96 |
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| 97 | private Uri GetLocalPathUri(XmlElement cacheElm)
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| 98 | {
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| 99 | if (cacheElm.HasAttribute("local-path"))
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| 100 | {
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| 101 | string path = Path.Combine(cacheDir, cacheElm.GetAttribute("local-path"));
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| 102 | if(File.Exists(path))
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| 103 | {
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| 104 | path = "file:///" + path.Replace('\\', '/');
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| 105 | return new Uri(path);
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| 106 | }
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| 107 | else
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| 108 | {
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| 109 | cacheElm.RemoveAttribute("local-path");
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| 110 | return null;
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| 111 | }
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| 112 | }
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| 113 | else
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| 114 | {
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| 115 | return null;
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| 116 | }
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| 117 | }
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| 118 |
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| 119 | public long Size
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| 120 | {
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| 121 | get
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| 122 | {
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| 123 | DirectoryInfo di = new DirectoryInfo(cacheDir);
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| 124 | FileInfo[] files = di.GetFiles();
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| 125 | long size = 0;
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| 126 | foreach(FileInfo file in files)
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| 127 | {
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| 128 | size += file.Length;
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| 129 | }
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| 130 | return size;
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| 131 | }
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| 132 | }
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| 133 |
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| 134 | public void Clear()
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| 135 | {
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| 136 | DirectoryInfo di = new DirectoryInfo(cacheDir);
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| 137 | FileInfo[] files = di.GetFiles();
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| 138 | foreach(FileInfo file in files)
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| 139 | {
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| 140 | try
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| 141 | {
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| 142 | file.Delete();
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| 143 | }
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| 144 | catch{}
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| 145 | }
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| 146 |
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| 147 | cacheDoc = new XmlDocument();
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| 148 |
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| 149 | LoadDoc();
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| 150 | }
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| 151 |
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| 152 | public CacheInfo GetCacheInfo(Uri uri)
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| 153 | {
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| 154 | XmlElement cacheElm = GetCacheElm(uri);
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| 155 |
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| 156 | DateTime expires = DateTime.MinValue;
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| 157 | if(cacheElm.HasAttribute("expires"))
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| 158 | {
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| 159 | expires = DateTime.Parse(cacheElm.GetAttribute("expires"));
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| 160 | }
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| 161 |
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| 162 | DateTime lastModified = DateTime.MinValue;
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| 163 | if(cacheElm.HasAttribute("last-modified"))
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| 164 | {
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| 165 | lastModified = DateTime.Parse(cacheElm.GetAttribute("last-modified"));
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| 166 | }
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| 167 |
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| 168 | Uri cachedUri = GetLocalPathUri(cacheElm);
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| 169 |
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| 170 | return new CacheInfo(expires, cacheElm.GetAttribute("etag"), lastModified, cachedUri, cacheElm.GetAttribute("content-type"));
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| 171 | }
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| 172 |
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| 173 | public void SetCacheInfo(Uri uri, CacheInfo cacheInfo, Stream stream)
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| 174 | {
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| 175 | XmlElement cacheElm = GetCacheElm(uri);
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| 176 |
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| 177 | if(cacheInfo != null)
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| 178 | {
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| 179 | if(cacheInfo.ETag != null)
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| 180 | {
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| 181 | cacheElm.SetAttribute("etag", cacheInfo.ETag);
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| 182 | }
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| 183 | else
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| 184 | {
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| 185 | cacheElm.RemoveAttribute("etag");
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| 186 | }
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| 187 |
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| 188 | if(cacheInfo.ContentType != null)
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| 189 | {
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| 190 | cacheElm.SetAttribute("content-type", cacheInfo.ContentType);
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| 191 | }
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| 192 | else
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| 193 | {
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| 194 | cacheElm.RemoveAttribute("content-type");
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| 195 | }
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| 196 |
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| 197 | if(cacheInfo.Expires != DateTime.MinValue)
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| 198 | {
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| 199 | cacheElm.SetAttribute("expires", cacheInfo.Expires.ToString("s"));
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| 200 | }
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| 201 | else
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| 202 | {
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| 203 | cacheElm.RemoveAttribute("expires");
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| 204 | }
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| 205 |
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| 206 | if(cacheInfo.LastModified != DateTime.MinValue)
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| 207 | {
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| 208 | cacheElm.SetAttribute("last-modified", cacheInfo.LastModified.ToString("s"));
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| 209 | }
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| 210 | else
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| 211 | {
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| 212 | cacheElm.RemoveAttribute("last-modified");
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| 213 | }
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| 214 | }
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| 215 |
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| 216 | if (stream != null)
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| 217 | {
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| 218 | string localPath;
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| 219 | if(cacheElm.HasAttribute("local-path"))
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| 220 | {
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| 221 | localPath = cacheElm.GetAttribute("local-path");
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| 222 | }
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| 223 | else
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| 224 | {
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| 225 | localPath = Guid.NewGuid().ToString() + ".cache";
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| 226 | cacheElm.SetAttribute("local-path", localPath);
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| 227 | }
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| 228 |
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| 229 | stream.Position = 0;
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| 230 | int count;
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| 231 | byte[] buffer = new byte[4096];
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| 232 |
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| 233 | FileStream fs = File.OpenWrite(Path.Combine(cacheDir, localPath));
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| 234 | while((count = stream.Read(buffer, 0, 4096)) > 0) fs.Write(buffer, 0, count);
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| 235 | fs.Flush();
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| 236 | fs.Close();
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| 237 | }
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| 238 | SaveDoc();
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| 239 | }
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| 240 | }
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| 241 | }
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