mcs/class/System.Configuration/System.Configuration/Configuration.cs

   1 //
   2 // System.Configuration.Configuration.cs
   3 //
   4 // Authors:
   5 //      Duncan Mak (duncan@ximian.com)
   6 //      Lluis Sanchez Gual (lluis@novell.com)
   7 //
   8 // Permission is hereby granted, free of charge, to any person obtaining
   9 // a copy of this software and associated documentation files (the
  10 // "Software"), to deal in the Software without restriction, including
  11 // without limitation the rights to use, copy, modify, merge, publish,
  12 // distribute, sublicense, and/or sell copies of the Software, and to
  13 // permit persons to whom the Software is furnished to do so, subject to
  14 // the following conditions:
  15 //
  16 // The above copyright notice and this permission notice shall be
  17 // included in all copies or substantial portions of the Software.
  18 //
  19 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  20 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  21 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  22 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  23 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  24 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  25 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  26 //
  27 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
  28 //
  29 #if NET_2_0
  30 using System;
  31 using System.Collections;
  32 using System.Collections.Specialized;
  33 using System.Configuration.Internal;
  34 using System.ComponentModel;
  35 using System.Reflection;
  36 using System.Xml;
  37 using System.IO;
  38
  39 namespace System.Configuration {
  40
  41         // For configuration document, use this XmlDocument instead of the standard one. This ignores xmlns attribute for MS.
  42         internal class ConfigurationXmlDocument : XmlDocument
  43         {
  44                 public override XmlElement CreateElement (string prefix, string localName, string namespaceURI)
  45                 {
  46                         if (namespaceURI == "http://schemas.microsoft.com/.NetConfiguration/v2.0")
  47                                 return base.CreateElement (String.Empty, localName, String.Empty);
  48                         else
  49                                 return base.CreateElement (prefix, localName, namespaceURI);
  50                 }
  51         }
  52
  53         public sealed class Configuration
  54         {
  55                 Configuration parent;
  56                 Hashtable elementData = new Hashtable ();
  57                 string streamName;
  58                 ConfigurationSectionGroup rootSectionGroup;
  59                 ConfigurationLocationCollection locations;
  60                 SectionGroupInfo rootGroup;
  61                 IConfigSystem system;
  62                 bool hasFile;
  63                 string rootNamespace;
  64
  65                 string configPath;
  66                 string locationConfigPath;
  67                 string locationSubPath;
  68
  69                 internal static event ConfigurationSaveEventHandler SaveStart;
  70                 internal static event ConfigurationSaveEventHandler SaveEnd;
  71
  72                 internal Configuration (Configuration parent, string locationSubPath)
  73                 {
  74                         this.parent = parent;
  75                         this.system = parent.system;
  76                         this.rootGroup = parent.rootGroup;
  77                         this.locationSubPath = locationSubPath;
  78                         this.configPath = parent.ConfigPath;
  79                 }
  80
  81                 internal Configuration (InternalConfigurationSystem system, string locationSubPath)
  82                 {
  83                         hasFile = true;
  84                         this.system = system;
  85
  86                         system.InitForConfiguration (ref locationSubPath, out configPath, out locationConfigPath);
  87
  88                         Configuration parent = null;
  89
  90                         if (locationSubPath != null) {
  91                                 parent = new Configuration (system, locationSubPath);
  92                                 if (locationConfigPath != null)
  93                                         parent = parent.FindLocationConfiguration (locationConfigPath, parent);
  94                         }
  95
  96                         Init (system, configPath, parent);
  97                 }
  98
  99                 internal Configuration FindLocationConfiguration (string relativePath, Configuration defaultConfiguration)
 100                 {
 101                         Configuration parentConfig = defaultConfiguration;
 102
 103                         if (!String.IsNullOrEmpty (LocationConfigPath)) {
 104                                 Configuration parentFile = GetParentWithFile ();
 105                                 if (parentFile != null) {
 106                                         string parentRelativePath = system.Host.GetConfigPathFromLocationSubPath (configPath, relativePath);
 107                                         parentConfig = parentFile.FindLocationConfiguration (parentRelativePath, defaultConfiguration);
 108                                 }
 109                         }
 110
 111                         string relConfigPath = configPath.Substring (1) + "/";
 112                         if (relativePath.StartsWith (relConfigPath, StringComparison.Ordinal))
 113                                 relativePath = relativePath.Substring (relConfigPath.Length);
 114
 115                         ConfigurationLocation loc = Locations.FindBest (relativePath);
 116                         if (loc == null)
 117                                 return parentConfig;
 118
 119                         loc.SetParentConfiguration (parentConfig);
 120                         return loc.OpenConfiguration ();
 121                 }
 122
 123                 internal void Init (IConfigSystem system, string configPath, Configuration parent)
 124                 {
 125                         this.system = system;
 126                         this.configPath = configPath;
 127                         streamName = system.Host.GetStreamName (configPath);
 128                         this.parent = parent;
 129                         if (parent != null)
 130                                 rootGroup = parent.rootGroup;
 131                         else {
 132                                 rootGroup = new SectionGroupInfo ();
 133                                 rootGroup.StreamName = streamName;
 134                         }
 135
 136                         if (streamName != null)
 137                                 Load ();
 138                 }
 139
 140                 internal Configuration Parent {
 141                         get { return parent; }
 142                         set { parent = value; }
 143                 }
 144
 145                 internal Configuration GetParentWithFile ()
 146                 {
 147                         Configuration parentFile = Parent;
 148                         while (parentFile != null && !parentFile.HasFile)
 149                                 parentFile = parentFile.Parent;
 150                         return parentFile;
 151                 }
 152
 153                 internal string FileName {
 154                         get { return streamName; }
 155                 }
 156
 157                 internal IInternalConfigHost ConfigHost {
 158                         get { return system.Host; }
 159                 }
 160
 161                 internal string LocationConfigPath {
 162                         get { return locationConfigPath; }
 163                 }
 164
 165                 internal string GetLocationSubPath ()
 166                 {
 167                         Configuration confg = parent;
 168                         string path = null;
 169                         while (confg != null) {
 170                                 path = confg.locationSubPath;
 171                                 if (!String.IsNullOrEmpty (path))
 172                                         return path;
 173                                 confg = confg.parent;
 174                         }
 175                         return path;
 176                 }
 177
 178                 internal string ConfigPath {
 179                         get { return configPath; }
 180                 }
 181
 182                 public AppSettingsSection AppSettings {
 183                         get { return (AppSettingsSection) GetSection ("appSettings"); }
 184                 }
 185
 186                 public ConnectionStringsSection ConnectionStrings {
 187                         get { return (ConnectionStringsSection) GetSection ("connectionStrings"); }
 188                 }
 189
 190                 // MSDN: If the value for this FilePath property represents a merged view and
 191                 // no actual file exists for the application, the path to the parent configuration
 192                 // file is returned.
 193                 public string FilePath {
 194                         get {
 195                                 if (streamName == null && parent != null)
 196                                         return parent.FilePath;
 197                                 return streamName;
 198                         }
 199                 }
 200
 201                 public bool HasFile {
 202                         get {
 203                                 return hasFile;
 204                         }
 205                 }
 206
 207                 ContextInformation evaluationContext;
 208                 public ContextInformation EvaluationContext {
 209                         get {
 210                                 if (evaluationContext == null) {
 211                                         object ctx = system.Host.CreateConfigurationContext (configPath, GetLocationSubPath() );
 212                                         evaluationContext = new ContextInformation (this, ctx);
 213                                 }
 214
 215
 216                                 return evaluationContext;
 217                         }
 218                 }
 219
 220                 public ConfigurationLocationCollection Locations {
 221                         get {
 222                                 if (locations == null) locations = new ConfigurationLocationCollection ();
 223                                 return locations;
 224                         }
 225                 }
 226
 227                 public bool NamespaceDeclared {
 228                         get { return rootNamespace != null; }
 229                         set { rootNamespace = value ? "http://schemas.microsoft.com/.NetConfiguration/v2.0" : null; }
 230                 }
 231
 232                 public ConfigurationSectionGroup RootSectionGroup {
 233                         get {
 234                                 if (rootSectionGroup == null) {
 235                                         rootSectionGroup = new ConfigurationSectionGroup ();
 236                                         rootSectionGroup.Initialize (this, rootGroup);
 237                                 }
 238                                 return rootSectionGroup;
 239                         }
 240                 }
 241
 242                 public ConfigurationSectionGroupCollection SectionGroups {
 243                         get { return RootSectionGroup.SectionGroups; }
 244                 }
 245
 246                 public ConfigurationSectionCollection Sections {
 247                         get { return RootSectionGroup.Sections; }
 248                 }
 249
 250                 public ConfigurationSection GetSection (string path)
 251                 {
 252                         string[] parts = path.Split ('/');
 253                         if (parts.Length == 1)
 254                                 return Sections [parts[0]];
 255
 256                         ConfigurationSectionGroup group = SectionGroups [parts[0]];
 257                         for (int n=1; group != null && n<parts.Length-1; n++)
 258                                 group = group.SectionGroups [parts [n]];
 259
 260                         if (group != null)
 261                                 return group.Sections [parts [parts.Length - 1]];
 262                         else
 263                                 return null;
 264                 }
 265
 266                 public ConfigurationSectionGroup GetSectionGroup (string path)
 267                 {
 268                         string[] parts = path.Split ('/');
 269                         ConfigurationSectionGroup group = SectionGroups [parts[0]];
 270                         for (int n=1; group != null && n<parts.Length; n++)
 271                                 group = group.SectionGroups [parts [n]];
 272                         return group;
 273                 }
 274
 275                 internal ConfigurationSection GetSectionInstance (SectionInfo config, bool createDefaultInstance)
 276                 {
 277                         object data = elementData [config];
 278                         ConfigurationSection sec = data as ConfigurationSection;
 279                         if (sec != null || !createDefaultInstance) return sec;
 280
 281                         object secObj = config.CreateInstance ();
 282                         sec = secObj as ConfigurationSection;
 283                         if (sec == null) {
 284                                 DefaultSection ds = new DefaultSection ();
 285                                 ds.SectionHandler = secObj as IConfigurationSectionHandler;
 286                                 sec = ds;
 287                         }
 288                         sec.Configuration = this;
 289
 290                         ConfigurationSection parentSection = null;
 291                         if (parent != null) {
 292                                 parentSection = parent.GetSectionInstance (config, true);
 293                                 sec.SectionInformation.SetParentSection (parentSection);
 294                         }
 295                         sec.SectionInformation.ConfigFilePath = FilePath;
 296
 297                         sec.ConfigContext = system.Host.CreateDeprecatedConfigContext(configPath);
 298
 299                         string xml = data as string;
 300                         sec.RawXml = xml;
 301                         sec.Reset (parentSection);
 302
 303                         if (xml != null) {
 304                                 XmlTextReader r = new ConfigXmlTextReader (new StringReader (xml), FilePath);
 305                                 sec.DeserializeSection (r);
 306                                 r.Close ();
 307
 308                                 if (!String.IsNullOrEmpty (sec.SectionInformation.ConfigSource) && !String.IsNullOrEmpty (FilePath))
 309                                         sec.DeserializeConfigSource (Path.GetDirectoryName (FilePath));
 310                         }
 311
 312                         elementData [config] = sec;
 313                         return sec;
 314                 }
 315
 316                 internal ConfigurationSectionGroup GetSectionGroupInstance (SectionGroupInfo group)
 317                 {
 318                         ConfigurationSectionGroup gr = group.CreateInstance () as ConfigurationSectionGroup;
 319                         if (gr != null) gr.Initialize (this, group);
 320                         return gr;
 321                 }
 322
 323                 internal void SetConfigurationSection (SectionInfo config, ConfigurationSection sec)
 324                 {
 325                         elementData [config] = sec;
 326                 }
 327
 328                 internal void SetSectionXml (SectionInfo config, string data)
 329                 {
 330                         elementData [config] = data;
 331                 }
 332
 333                 internal string GetSectionXml (SectionInfo config)
 334                 {
 335                         return elementData [config] as string;
 336                 }
 337
 338                 internal void CreateSection (SectionGroupInfo group, string name, ConfigurationSection sec)
 339                 {
 340                         if (group.HasChild (name))
 341                                 throw new ConfigurationErrorsException ("Cannot add a ConfigurationSection. A section or section group already exists with the name '" + name + "'");
 342
 343                         if (!HasFile && !sec.SectionInformation.AllowLocation)
 344                                 throw new ConfigurationErrorsException ("The configuration section <" + name + "> cannot be defined inside a <location> element.");
 345
 346                         if (!system.Host.IsDefinitionAllowed (configPath, sec.SectionInformation.AllowDefinition, sec.SectionInformation.AllowExeDefinition)) {
 347                                 object ctx = sec.SectionInformation.AllowExeDefinition != ConfigurationAllowExeDefinition.MachineToApplication ? (object) sec.SectionInformation.AllowExeDefinition : (object) sec.SectionInformation.AllowDefinition;
 348                                 throw new ConfigurationErrorsException ("The section <" + name + "> can't be defined in this configuration file (the allowed definition context is '" + ctx + "').");
 349                         }
 350
 351                         if (sec.SectionInformation.Type == null)
 352                                 sec.SectionInformation.Type = system.Host.GetConfigTypeName (sec.GetType ());
 353
 354                         SectionInfo section = new SectionInfo (name, sec.SectionInformation);
 355                         section.StreamName = streamName;
 356                         section.ConfigHost = system.Host;
 357                         group.AddChild (section);
 358                         elementData [section] = sec;
 359                         sec.Configuration = this;
 360                 }
 361
 362                 internal void CreateSectionGroup (SectionGroupInfo parentGroup, string name, ConfigurationSectionGroup sec)
 363                 {
 364                         if (parentGroup.HasChild (name)) throw new ConfigurationErrorsException ("Cannot add a ConfigurationSectionGroup. A section or section group already exists with the name '" + name + "'");
 365                         if (sec.Type == null) sec.Type = system.Host.GetConfigTypeName (sec.GetType ());
 366                         sec.SetName (name);
 367
 368                         SectionGroupInfo section = new SectionGroupInfo (name, sec.Type);
 369                         section.StreamName = streamName;
 370                         section.ConfigHost = system.Host;
 371                         parentGroup.AddChild (section);
 372                         elementData [section] = sec;
 373
 374                         sec.Initialize (this, section);
 375                 }
 376
 377                 internal void RemoveConfigInfo (ConfigInfo config)
 378                 {
 379                         elementData.Remove (config);
 380                 }
 381
 382                 public void Save ()
 383                 {
 384                         Save (ConfigurationSaveMode.Modified, false);
 385                 }
 386
 387                 public void Save (ConfigurationSaveMode mode)
 388                 {
 389                         Save (mode, false);
 390                 }
 391
 392                 public void Save (ConfigurationSaveMode mode, bool forceUpdateAll)
 393                 {
 394                         ConfigurationSaveEventHandler saveStart = SaveStart;
 395                         ConfigurationSaveEventHandler saveEnd = SaveEnd;
 396
 397                         object ctx = null;
 398                         Exception saveEx = null;
 399                         Stream stream = system.Host.OpenStreamForWrite (streamName, null, ref ctx);
 400                         try {
 401                                 if (saveStart != null)
 402                                         saveStart (this, new ConfigurationSaveEventArgs (streamName, true, null, ctx));
 403
 404                                 Save (stream, mode, forceUpdateAll);
 405                                 system.Host.WriteCompleted (streamName, true, ctx);
 406                         } catch (Exception ex) {
 407                                 saveEx = ex;
 408                                 system.Host.WriteCompleted (streamName, false, ctx);
 409                                 throw;
 410                         } finally {
 411                                 stream.Close ();
 412                                 if (saveEnd != null)
 413                                         saveEnd (this, new ConfigurationSaveEventArgs (streamName, false, saveEx, ctx));
 414                         }
 415                 }
 416
 417                 public void SaveAs (string filename)
 418                 {
 419                         SaveAs (filename, ConfigurationSaveMode.Modified, false);
 420                 }
 421
 422                 public void SaveAs (string filename, ConfigurationSaveMode mode)
 423                 {
 424                         SaveAs (filename, mode, false);
 425                 }
 426
 427                 [MonoInternalNote ("Detect if file has changed")]
 428                 public void SaveAs (string filename, ConfigurationSaveMode mode, bool forceUpdateAll)
 429                 {
 430                         string dir = Path.GetDirectoryName (Path.GetFullPath (filename));
 431                         if (!Directory.Exists (dir))
 432                                 Directory.CreateDirectory (dir);
 433                         Save (new FileStream (filename, FileMode.OpenOrCreate, FileAccess.Write), mode, forceUpdateAll);
 434                 }
 435
 436                 void Save (Stream stream, ConfigurationSaveMode mode, bool forceUpdateAll)
 437                 {
 438                         XmlTextWriter tw = new XmlTextWriter (new StreamWriter (stream));
 439                         tw.Formatting = Formatting.Indented;
 440                         try {
 441                                 tw.WriteStartDocument ();
 442                                 if (rootNamespace != null)
 443                                         tw.WriteStartElement ("configuration", rootNamespace);
 444                                 else
 445                                         tw.WriteStartElement ("configuration");
 446                                 if (rootGroup.HasConfigContent (this)) {
 447                                         rootGroup.WriteConfig (this, tw, mode);
 448                                 }
 449
 450                                 foreach (ConfigurationLocation loc in Locations) {
 451                                         if (loc.OpenedConfiguration == null) {
 452                                                 tw.WriteRaw ("\n");
 453                                                 tw.WriteRaw (loc.XmlContent);
 454                                         }
 455                                         else {
 456                                                 tw.WriteStartElement ("location");
 457                                                 tw.WriteAttributeString ("path", loc.Path);
 458                                                 if (!loc.AllowOverride)
 459                                                         tw.WriteAttributeString ("allowOverride", "false");
 460                                                 loc.OpenedConfiguration.SaveData (tw, mode, forceUpdateAll);
 461                                                 tw.WriteEndElement ();
 462                                         }
 463                                 }
 464
 465                                 SaveData (tw, mode, forceUpdateAll);
 466                                 tw.WriteEndElement ();
 467                         }
 468                         finally {
 469                                 tw.Flush ();
 470                                 tw.Close ();
 471                         }
 472                 }
 473
 474                 void SaveData (XmlTextWriter tw, ConfigurationSaveMode mode, bool forceUpdateAll)
 475                 {
 476                         rootGroup.WriteRootData (tw, this, mode);
 477                 }
 478
 479                 bool Load ()
 480                 {
 481                         if (String.IsNullOrEmpty (streamName))
 482                                 return true;
 483
 484                         Stream stream = null;
 485                         try {
 486                                 stream = system.Host.OpenStreamForRead (streamName);
 487                                 if (stream == null)
 488                                         return false;
 489                         } catch {
 490                                 return false;
 491                         }
 492
 493                         using (XmlTextReader reader = new ConfigXmlTextReader (stream, streamName)) {
 494                                 ReadConfigFile (reader, streamName);
 495                         }
 496                         return true;
 497                 }
 498
 499                 void ReadConfigFile (XmlReader reader, string fileName)
 500                 {
 501                         reader.MoveToContent ();
 502
 503                         if (reader.NodeType != XmlNodeType.Element || reader.Name != "configuration")
 504                                 ThrowException ("Configuration file does not have a valid root element", reader);
 505
 506                         if (reader.HasAttributes) {
 507                                 while (reader.MoveToNextAttribute ()) {
 508                                         if (reader.LocalName == "xmlns") {
 509                                                 rootNamespace = reader.Value;
 510                                                 continue;
 511                                         }
 512                                         ThrowException (String.Format ("Unrecognized attribute '{0}' in root element", reader.LocalName), reader);
 513                                 }
 514                         }
 515
 516                         reader.MoveToElement ();
 517
 518                         if (reader.IsEmptyElement) {
 519                                 reader.Skip ();
 520                                 return;
 521                         }
 522
 523                         reader.ReadStartElement ();
 524                         reader.MoveToContent ();
 525
 526                         if (reader.LocalName == "configSections") {
 527                                 if (reader.HasAttributes)
 528                                         ThrowException ("Unrecognized attribute in <configSections>.", reader);
 529
 530                                 rootGroup.ReadConfig (this, fileName, reader);
 531                         }
 532
 533                         rootGroup.ReadRootData (reader, this, true);
 534                 }
 535
 536                 internal void ReadData (XmlReader reader, bool allowOverride)
 537                 {
 538                         rootGroup.ReadData (this, reader, allowOverride);
 539                 }
 540
 541
 542                 private void ThrowException (string text, XmlReader reader)
 543                 {
 544                         IXmlLineInfo li = reader as IXmlLineInfo;
 545                         throw new ConfigurationErrorsException (text, streamName, li != null ? li.LineNumber : 0);
 546                 }
 547         }
 548 }
 549
 550 #endif