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