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 using System;
  31 using System.Collections.Generic;
  32 using System.Collections.Specialized;
  33 using System.IO;
  34 using System.Runtime.InteropServices;
  35 using System.Web;
  36 using System.Web.Configuration;
  37 using System.Xml;
  38 using System.Xml.XPath;
  39
  40 namespace Mono.Web.Util
  41 {
  42         public class SettingsMappingManager
  43         {
  44                 const string settingsMapFileName = "settings.map";
  45                 const string localSettingsMapFileName = settingsMapFileName + ".config";
  46
  47                 static object mapperLock = new object ();
  48
  49                 static SettingsMappingManager _instance;
  50                 static string _mappingFile;
  51                 Dictionary <Type, SettingsMapping> _mappers;
  52                 static Dictionary <object, object> _mappedSections;
  53                 static SettingsMappingPlatform _myPlatform;
  54
  55                 static bool _runningOnWindows;
  56                 internal static bool IsRunningOnWindows {
  57                         get { return _runningOnWindows; }
  58                 }
  59
  60                 public static SettingsMappingPlatform Platform {
  61                         get { return _myPlatform; }
  62                 }
  63
  64                 public bool HasMappings {
  65                         get { return (_mappers != null && _mappers.Count > 0); }
  66                 }
  67
  68                 static SettingsMappingManager ()
  69                 {
  70                         _mappingFile = Path.Combine (Path.GetDirectoryName (RuntimeEnvironment.SystemConfigurationFile), settingsMapFileName);
  71                         PlatformID pid = Environment.OSVersion.Platform;
  72                         _runningOnWindows = ((int) pid != 128 && (int) pid != 4 && (int) pid != 6);
  73
  74                 }
  75
  76                 static public void Init ()
  77                 {
  78                         if (_instance != null)
  79                                 return;
  80
  81                         if (Environment.GetEnvironmentVariable ("MONO_ASPNET_INHIBIT_SETTINGSMAP") != null)
  82                                 return;
  83
  84                         NameValueCollection appSettings = WebConfigurationManager.AppSettings;
  85                         if (appSettings != null) {
  86                                 string inhibit = appSettings ["MonoAspnetInhibitSettingsMap"];
  87                                 if (String.Compare (inhibit, "true", StringComparison.OrdinalIgnoreCase) == 0)
  88                                         return;
  89                         }
  90
  91                         if (IsRunningOnWindows)
  92                                 _myPlatform = SettingsMappingPlatform.Windows;
  93                         else
  94                                 _myPlatform = SettingsMappingPlatform.Unix;
  95
  96                         SettingsMappingManager mapper = new SettingsMappingManager ();
  97                         mapper.LoadMappings ();
  98
  99                         if (mapper.HasMappings) {
 100                                 _instance = mapper;
 101                                 _mappedSections = new Dictionary <object, object> ();
 102                         }
 103                 }
 104
 105                 void LoadMappings ()
 106                 {
 107                         if (File.Exists (_mappingFile))
 108                                 LoadMappings (_mappingFile);
 109
 110                         AppDomainSetup domain = AppDomain.CurrentDomain.SetupInformation;
 111                         string appMappingFile = Path.Combine (domain.ApplicationBase, localSettingsMapFileName);
 112                         if (File.Exists (appMappingFile))
 113                                 LoadMappings (appMappingFile);
 114                 }
 115
 116                 void LoadMappings (string mappingFilePath)
 117                 {
 118                         XPathNavigator top;
 119                         XPathDocument doc;
 120                         try {
 121                                 doc = new XPathDocument (mappingFilePath);
 122                                 top = doc.CreateNavigator ();
 123                         } catch (Exception ex) {
 124                                 throw new ApplicationException ("Error loading mapping settings", ex);
 125                         }
 126
 127                         XPathNodeIterator iter;
 128                         if (_mappers == null)
 129                                 _mappers = new Dictionary <Type, SettingsMapping> ();
 130                         else {
 131                                 iter = top.Select ("//settingsMap/clear");
 132                                 if (iter.MoveNext ())
 133                                         _mappers.Clear ();
 134                         }
 135
 136                         iter = top.Select ("//settingsMap/map[string-length (@sectionType) > 0 and string-length (@mapperType) > 0 and string-length (@platform) > 0]");
 137                         SettingsMapping map;
 138
 139                         while (iter.MoveNext ()) {
 140                                 map = new SettingsMapping (iter.Current);
 141                                 if (_myPlatform != map.Platform)
 142                                         continue;
 143
 144                                 if (!_mappers.ContainsKey (map.SectionType))
 145                                         _mappers.Add (map.SectionType, map);
 146                                 else
 147                                         _mappers [map.SectionType] = map;
 148                         }
 149                 }
 150
 151                 public static object MapSection (object input)
 152                 {
 153                         if (_instance == null || input == null)
 154                                 return input;
 155
 156                         object mappedSection;
 157                         if (_mappedSections.TryGetValue (input, out mappedSection))
 158                                 return mappedSection;
 159
 160                         object ret = _instance.MapSection (input, input.GetType ());
 161                         lock (mapperLock) {
 162                                 if (ret != null && !_mappedSections.ContainsKey (ret))
 163                                         _mappedSections.Add (ret, ret);
 164                         }
 165
 166                         return ret;
 167                 }
 168
 169                 object MapSection (object input, Type type)
 170                 {
 171                         if (_mappers == null || _mappers.Count == 0 || !_mappers.ContainsKey (type))
 172                                 return input;
 173
 174                         SettingsMapping map;
 175                         if (!_mappers.TryGetValue (type, out map))
 176                                 return input;
 177
 178                         if (map == null)
 179                                 return input;
 180
 181                         return map.MapSection (input, type);
 182                 }
 183         }
 184 }