mcs/class/System.Web/Mono.Web.Util/SettingsMappingManager.cs

   1 //
   2 // Mono.Web.Util.SettingsMappingManager
   3 //
   4 // Authors:
   5 //   Marek Habersack (mhabersack@novell.com)
   6 //
   7 // (C) 2007 Novell, Inc
   8 //
   9
  10 //
  11 // Permission is hereby granted, free of charge, to any person obtaining
  12 // a copy of this software and associated documentation files (the
  13 // "Software"), to deal in the Software without restriction, including
  14 // without limitation the rights to use, copy, modify, merge, publish,
  15 // distribute, sublicense, and/or sell copies of the Software, and to
  16 // permit persons to whom the Software is furnished to do so, subject to
  17 // the following conditions:
  18 //
  19 // The above copyright notice and this permission notice shall be
  20 // included in all copies or substantial portions of the Software.
  21 //
  22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  26 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  27 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  29 //
  30 #if NET_2_0
  31 using System;
  32 using System.Collections.Generic;
  33 using System.Collections.Specialized;
  34 using System.IO;
  35 using System.Runtime.InteropServices;
  36 using System.Web;
  37 using System.Web.Configuration;
  38 using System.Xml;
  39 using System.Xml.XPath;
  40
  41 namespace Mono.Web.Util
  42 {
  43         public class SettingsMappingManager
  44         {
  45                 const string settingsMapFileName = "settings.map";
  46                 const string localSettingsMapFileName = settingsMapFileName + ".config";
  47
  48                 static object mapperLock = new object ();
  49
  50                 static SettingsMappingManager _instance;
  51                 static string _mappingFile;
  52                 Dictionary <Type, SettingsMapping> _mappers;
  53                 static Dictionary <object, object> _mappedSections;
  54                 static SettingsMappingPlatform _myPlatform;
  55
  56                 static bool _runningOnWindows;
  57                 internal static bool IsRunningOnWindows {
  58                         get { return _runningOnWindows; }
  59                 }
  60
  61                 public static SettingsMappingPlatform Platform {
  62                         get { return _myPlatform; }
  63                 }
  64
  65                 public bool HasMappings {
  66                         get { return (_mappers != null && _mappers.Count > 0); }
  67                 }
  68
  69                 static SettingsMappingManager ()
  70                 {
  71                         _mappingFile = Path.Combine (Path.GetDirectoryName (RuntimeEnvironment.SystemConfigurationFile), settingsMapFileName);
  72                         PlatformID pid = Environment.OSVersion.Platform;
  73                         _runningOnWindows = ((int) pid != 128 && (int) pid != 4 && (int) pid != 6);
  74
  75                 }
  76
  77                 static public void Init ()
  78                 {
  79                         if (_instance != null)
  80                                 return;
  81
  82                         if (Environment.GetEnvironmentVariable ("MONO_ASPNET_INHIBIT_SETTINGSMAP") != null)
  83                                 return;
  84
  85                         NameValueCollection appSettings = WebConfigurationManager.AppSettings;
  86                         if (appSettings != null) {
  87                                 string inhibit = appSettings ["MonoAspnetInhibitSettingsMap"];
  88                                 if (String.Compare (inhibit, "true", StringComparison.OrdinalIgnoreCase) == 0)
  89                                         return;
  90                         }
  91
  92                         if (IsRunningOnWindows)
  93                                 _myPlatform = SettingsMappingPlatform.Windows;
  94                         else
  95                                 _myPlatform = SettingsMappingPlatform.Unix;
  96
  97                         SettingsMappingManager mapper = new SettingsMappingManager ();
  98                         mapper.LoadMappings ();
  99
 100                         if (mapper.HasMappings) {
 101                                 _instance = mapper;
 102                                 _mappedSections = new Dictionary <object, object> ();
 103                         }
 104                 }
 105
 106                 void LoadMappings ()
 107                 {
 108                         if (File.Exists (_mappingFile))
 109                                 LoadMappings (_mappingFile);
 110
 111                         AppDomainSetup domain = AppDomain.CurrentDomain.SetupInformation;
 112                         string appMappingFile = Path.Combine (domain.ApplicationBase, localSettingsMapFileName);
 113                         if (File.Exists (appMappingFile))
 114                                 LoadMappings (appMappingFile);
 115                 }
 116
 117                 void LoadMappings (string mappingFilePath)
 118                 {
 119                         XPathNavigator top;
 120                         XPathDocument doc;
 121                         try {
 122                                 doc = new XPathDocument (mappingFilePath);
 123                                 top = doc.CreateNavigator ();
 124                         } catch (Exception ex) {
 125                                 throw new ApplicationException ("Error loading mapping settings", ex);
 126                         }
 127
 128                         XPathNodeIterator iter;
 129                         if (_mappers == null)
 130                                 _mappers = new Dictionary <Type, SettingsMapping> ();
 131                         else {
 132                                 iter = top.Select ("//settingsMap/clear");
 133                                 if (iter.MoveNext ())
 134                                         _mappers.Clear ();
 135                         }
 136
 137                         iter = top.Select ("//settingsMap/map[string-length (@sectionType) > 0 and string-length (@mapperType) > 0 and string-length (@platform) > 0]");
 138                         SettingsMapping map;
 139
 140                         while (iter.MoveNext ()) {
 141                                 map = new SettingsMapping (iter.Current);
 142                                 if (_myPlatform != map.Platform)
 143                                         continue;
 144
 145                                 if (!_mappers.ContainsKey (map.SectionType))
 146                                         _mappers.Add (map.SectionType, map);
 147                                 else
 148                                         _mappers [map.SectionType] = map;
 149                         }
 150                 }
 151
 152                 public static object MapSection (object input)
 153                 {
 154                         if (_instance == null || input == null)
 155                                 return input;
 156
 157                         object mappedSection;
 158                         if (_mappedSections.TryGetValue (input, out mappedSection))
 159                                 return mappedSection;
 160
 161                         object ret = _instance.MapSection (input, input.GetType ());
 162                         lock (mapperLock) {
 163                                 if (ret != null && !_mappedSections.ContainsKey (ret))
 164                                         _mappedSections.Add (ret, ret);
 165                         }
 166
 167                         return ret;
 168                 }
 169
 170                 object MapSection (object input, Type type)
 171                 {
 172                         if (_mappers == null || _mappers.Count == 0 || !_mappers.ContainsKey (type))
 173                                 return input;
 174
 175                         SettingsMapping map;
 176                         if (!_mappers.TryGetValue (type, out map))
 177                                 return input;
 178
 179                         if (map == null)
 180                                 return input;
 181
 182                         return map.MapSection (input, type);
 183                 }
 184         }
 185 }
 186 #endif