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

   1 //
   2 // System.Configuration.ConfigurationElement.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
  30 #if NET_2_0
  31 using System.Collections;
  32 using System.Xml;
  33 using System.Reflection;
  34 using System.IO;
  35 using System.ComponentModel;
  36
  37 namespace System.Configuration
  38 {
  39         public abstract class ConfigurationElement
  40         {
  41                 string rawXml;
  42                 bool modified;
  43                 ElementMap map;
  44                 ConfigurationPropertyCollection keyProps;
  45                 ConfigurationElementCollection defaultCollection;
  46                 bool readOnly;
  47                 ElementInformation elementInfo;
  48                 ConfigurationElementProperty elementProperty;
  49
  50                 protected ConfigurationElement ()
  51                 {
  52                 }
  53
  54                 internal virtual void InitFromProperty (PropertyInformation propertyInfo)
  55                 {
  56                         elementInfo = new ElementInformation (this, propertyInfo);
  57                         Init ();
  58                 }
  59
  60                 public ElementInformation ElementInformation {
  61                         get {
  62                                 if (elementInfo == null)
  63                                         elementInfo = new ElementInformation (this, null);
  64                                 return elementInfo;
  65                         }
  66                 }
  67
  68                 internal string RawXml {
  69                         get { return rawXml; }
  70                         set {
  71                                 // FIXME: this hack is nasty. We should make
  72                                 // some refactory on the entire assembly.
  73                                 if (rawXml == null || value != null)
  74                                         rawXml = value;
  75                         }
  76                 }
  77
  78                 protected internal virtual void Init ()
  79                 {
  80                 }
  81
  82                 protected internal virtual ConfigurationElementProperty ElementProperty {
  83                         get {
  84                                 if (elementProperty == null)
  85                                         elementProperty = new ConfigurationElementProperty (ElementInformation.Validator);
  86                                 return elementProperty;
  87                         }
  88                 }
  89
  90                 [MonoTODO]
  91                 protected ContextInformation EvaluationContext {
  92                         get {
  93                                 throw new NotImplementedException ();
  94                         }
  95                 }
  96
  97                 ConfigurationLockCollection lockAllAttributesExcept;
  98                 public ConfigurationLockCollection LockAllAttributesExcept {
  99                         get {
 100                                 if (lockAllAttributesExcept == null) {
 101                                         lockAllAttributesExcept = new ConfigurationLockCollection (this, ConfigurationLockType.Attribute | ConfigurationLockType.Exclude);
 102                                 }
 103
 104                                 return lockAllAttributesExcept;
 105                         }
 106                 }
 107
 108                 ConfigurationLockCollection lockAllElementsExcept;
 109                 public ConfigurationLockCollection LockAllElementsExcept {
 110                         get {
 111                                 if (lockAllElementsExcept == null) {
 112                                         lockAllElementsExcept = new ConfigurationLockCollection (this, ConfigurationLockType.Element | ConfigurationLockType.Exclude);
 113                                 }
 114
 115                                 return lockAllElementsExcept;
 116                         }
 117                 }
 118
 119                 ConfigurationLockCollection lockAttributes;
 120                 public ConfigurationLockCollection LockAttributes {
 121                         get {
 122                                 if (lockAttributes == null) {
 123                                         lockAttributes = new ConfigurationLockCollection (this, ConfigurationLockType.Attribute);
 124                                 }
 125
 126                                 return lockAttributes;
 127                         }
 128                 }
 129
 130                 ConfigurationLockCollection lockElements;
 131                 public ConfigurationLockCollection LockElements {
 132                         get {
 133                                 if (lockElements == null) {
 134                                         lockElements = new ConfigurationLockCollection (this, ConfigurationLockType.Element);
 135                                 }
 136
 137                                 return lockElements;
 138                         }
 139                 }
 140
 141                 bool lockItem;
 142                 public bool LockItem {
 143                         get { return lockItem; }
 144                         set { lockItem = value; }
 145                 }
 146
 147                 [MonoTODO]
 148                 protected virtual void ListErrors (IList list)
 149                 {
 150                         throw new NotImplementedException ();
 151                 }
 152
 153                 [MonoTODO]
 154                 protected void SetPropertyValue (ConfigurationProperty prop, object value, bool ignoreLocks)
 155                 {
 156                         try {
 157                                 /* XXX all i know for certain is that Validation happens here */
 158                                 prop.Validate (value);
 159
 160                                 /* XXX presumably the actual setting of the
 161                                  * property happens here instead of in the
 162                                  * set_Item code below, but that would mean
 163                                  * the Value needs to be stuffed in the
 164                                  * property, not the propertyinfo (or else the
 165                                  * property needs a ref to the property info
 166                                  * to correctly set the value). */
 167                         }
 168                         catch (Exception e) {
 169                                 throw new ConfigurationErrorsException (String.Format ("The value for the property '{0}' is not valid. The error is: {1}", prop.Name, e.Message), e);
 170                         }
 171                 }
 172
 173                 internal ConfigurationPropertyCollection GetKeyProperties ()
 174                 {
 175                         if (keyProps != null) return keyProps;
 176
 177                         if (map != null && map.Properties == Properties)
 178                                 keyProps = map.KeyProperties;
 179                         else {
 180                                 keyProps = new ConfigurationPropertyCollection ();
 181                                 foreach (ConfigurationProperty prop in Properties) {
 182                                         if (prop.IsKey)
 183                                                 keyProps.Add (prop);
 184                                 }
 185                         }
 186                         return keyProps;
 187                 }
 188
 189                 internal ConfigurationElementCollection GetDefaultCollection ()
 190                 {
 191                         if (defaultCollection != null) return defaultCollection;
 192
 193                         ConfigurationProperty defaultCollectionProp = null;
 194
 195                         if (map != null && map.Properties == Properties) {
 196                                 defaultCollectionProp = map.DefaultCollectionProperty;
 197                         }
 198                         else {
 199                                 foreach (ConfigurationProperty prop in Properties) {
 200                                         if (prop.IsDefaultCollection) {
 201                                                 defaultCollectionProp = prop;
 202                                                 break;
 203                                         }
 204                                 }
 205                         }
 206
 207                         if (defaultCollectionProp != null) {
 208                                 defaultCollection = this [defaultCollectionProp] as ConfigurationElementCollection;
 209                         }
 210
 211                         return defaultCollection;
 212                 }
 213
 214                 protected internal object this [ConfigurationProperty property] {
 215                         get { return this [property.Name]; }
 216                         set { this [property.Name] = value; }
 217                 }
 218
 219                 protected internal object this [string property_name] {
 220                         get {
 221                                 PropertyInformation pi = ElementInformation.Properties [property_name];
 222                                 if (pi == null)
 223                                         throw new InvalidOperationException ("Property '" + property_name + "' not found in configuration element");
 224
 225                                 return pi.Value;
 226                         }
 227
 228                         set {
 229                                 PropertyInformation pi = ElementInformation.Properties [property_name];
 230                                 if (pi == null)
 231                                         throw new InvalidOperationException ("Property '" + property_name + "' not found in configuration element");
 232
 233                                 SetPropertyValue (pi.Property, value, false);
 234
 235                                 pi.Value = value;
 236                                 modified = true;
 237                         }
 238                 }
 239
 240                 protected internal virtual ConfigurationPropertyCollection Properties {
 241                         get {
 242                                 if (map == null)
 243                                         map = ElementMap.GetMap (GetType());
 244                                 return map.Properties;
 245                         }
 246                 }
 247
 248                 public override bool Equals (object compareTo)
 249                 {
 250                         ConfigurationElement other = compareTo as ConfigurationElement;
 251                         if (other == null) return false;
 252                         if (GetType() != other.GetType()) return false;
 253
 254                         foreach (ConfigurationProperty prop in Properties) {
 255                                 if (!object.Equals (this [prop], other [prop]))
 256                                         return false;
 257                         }
 258                         return true;
 259                 }
 260
 261                 public override int GetHashCode ()
 262                 {
 263                         int code = 0;
 264                         foreach (ConfigurationProperty prop in Properties)
 265                                 code += this [prop].GetHashCode ();
 266                         return code;
 267                 }
 268
 269                 internal virtual bool HasValues ()
 270                 {
 271                         foreach (PropertyInformation pi in ElementInformation.Properties)
 272                                 if (pi.ValueOrigin != PropertyValueOrigin.Default)
 273                                         return true;
 274                         return false;
 275                 }
 276
 277                 protected internal virtual void DeserializeElement (XmlReader reader, bool serializeCollectionKey)
 278                 {
 279                         Hashtable readProps = new Hashtable ();
 280
 281                         reader.MoveToContent ();
 282                         while (reader.MoveToNextAttribute ())
 283                         {
 284                                 PropertyInformation prop = ElementInformation.Properties [reader.LocalName];
 285                                 if (prop == null || (serializeCollectionKey && !prop.IsKey)) {
 286                                         /* handle the built in ConfigurationElement attributes here */
 287                                         if (reader.LocalName == "lockAllAttributesExcept") {
 288                                                 LockAllAttributesExcept.SetFromList (reader.Value);
 289                                         }
 290                                         else if (reader.LocalName == "lockAllElementsExcept") {
 291                                                 LockAllElementsExcept.SetFromList (reader.Value);
 292                                         }
 293                                         else if (reader.LocalName == "lockAttributes") {
 294                                                 LockAttributes.SetFromList (reader.Value);
 295                                         }
 296                                         else if (reader.LocalName == "lockElements") {
 297                                                 LockElements.SetFromList (reader.Value);
 298                                         }
 299                                         else if (reader.LocalName == "lockItem") {
 300                                                 LockItem = (reader.Value.ToLower() == "true");
 301                                         }
 302                                         else if (reader.LocalName == "xmlns") {
 303                                                 /* ignore */
 304                                         }
 305                                         else if (!OnDeserializeUnrecognizedAttribute (reader.LocalName, reader.Value))
 306                                                 throw new ConfigurationException ("Unrecognized attribute '" + reader.LocalName + "'.");
 307
 308                                         continue;
 309                                 }
 310
 311                                 if (readProps.ContainsKey (prop))
 312                                         throw new ConfigurationException ("The attribute '" + prop.Name + "' may only appear once in this element.");
 313
 314                                 prop.SetStringValue (reader.Value);
 315                                 readProps [prop] = prop.Name;
 316                         }
 317
 318                         reader.MoveToElement ();
 319                         if (reader.IsEmptyElement) {
 320                                 reader.Skip ();
 321                         }
 322                         else {
 323
 324                                 int depth = reader.Depth;
 325
 326                                 reader.ReadStartElement ();
 327                                 reader.MoveToContent ();
 328
 329                                 do {
 330                                         if (reader.NodeType != XmlNodeType.Element) {
 331                                                 reader.Skip ();
 332                                                 continue;
 333                                         }
 334
 335                                         PropertyInformation prop = ElementInformation.Properties [reader.LocalName];
 336                                         if (prop == null || (serializeCollectionKey && !prop.IsKey)) {
 337                                                 if (prop == null) {
 338                                                         ConfigurationElementCollection c = GetDefaultCollection ();
 339                                                         if (c != null && c.OnDeserializeUnrecognizedElement (reader.LocalName, reader))
 340                                                                 continue;
 341                                                 }
 342
 343                                                 if (!OnDeserializeUnrecognizedElement (reader.LocalName, reader)) {
 344                                                         throw new ConfigurationException ("Unrecognized element '" + reader.LocalName + "'.");
 345                                                 }
 346                                                 continue;
 347                                         }
 348
 349                                         if (!prop.IsElement)
 350                                                 throw new ConfigurationException ("Property '" + prop.Name + "' is not a ConfigurationElement.");
 351
 352                                         if (readProps.Contains (prop))
 353                                                 throw new ConfigurationException ("The element <" + prop.Name + "> may only appear once in this section.");
 354
 355                                         ConfigurationElement val = (ConfigurationElement) prop.Value;
 356                                         val.DeserializeElement (reader, serializeCollectionKey);
 357                                         readProps [prop] = prop.Name;
 358
 359                                         reader.Read();
 360
 361                                 } while (depth < reader.Depth);
 362
 363                                 if (reader.NodeType == XmlNodeType.EndElement)
 364                                         reader.Read ();
 365                         }
 366
 367                         modified = false;
 368
 369                         foreach (PropertyInformation prop in ElementInformation.Properties)
 370                                 if (prop.IsRequired && !readProps.ContainsKey (prop)) {
 371                                         object val = OnRequiredPropertyNotFound (prop.Name);
 372                                         if (!object.Equals (val, prop.DefaultValue)) {
 373                                                 prop.Value = val;
 374                                                 prop.IsModified = false;
 375                                         }
 376                                 }
 377
 378                         PostDeserialize ();
 379                 }
 380
 381                 protected virtual bool OnDeserializeUnrecognizedAttribute (string name, string value)
 382                 {
 383                         return false;
 384                 }
 385
 386                 protected virtual bool OnDeserializeUnrecognizedElement (string element, XmlReader reader)
 387                 {
 388                         return false;
 389                 }
 390
 391                 protected virtual object OnRequiredPropertyNotFound (string name)
 392                 {
 393                         throw new ConfigurationErrorsException ("Required attribute '" + name + "' not found.");
 394                 }
 395
 396                 protected virtual void PreSerialize (XmlWriter writer)
 397                 {
 398                 }
 399
 400                 protected virtual void PostDeserialize ()
 401                 {
 402                 }
 403
 404                 protected internal virtual void InitializeDefault ()
 405                 {
 406                 }
 407
 408                 protected internal virtual bool IsModified ()
 409                 {
 410                         return modified;
 411                 }
 412
 413                 protected internal virtual void SetReadOnly ()
 414                 {
 415                         readOnly = true;
 416                 }
 417
 418                 public virtual bool IsReadOnly ()
 419                 {
 420                         return readOnly;
 421                 }
 422
 423                 protected internal virtual void Reset (ConfigurationElement parentElement)
 424                 {
 425                         if (parentElement != null)
 426                                 ElementInformation.Reset (parentElement.ElementInformation);
 427                         else
 428                                 InitializeDefault ();
 429                 }
 430
 431                 protected internal virtual void ResetModified ()
 432                 {
 433                         modified = false;
 434                         foreach (PropertyInformation p in ElementInformation.Properties)
 435                                 p.IsModified = false;
 436                 }
 437
 438                 protected internal virtual bool SerializeElement (XmlWriter writer, bool serializeCollectionKey)
 439                 {
 440                         PreSerialize (writer);
 441
 442                         if (serializeCollectionKey) {
 443                                 ConfigurationPropertyCollection props = GetKeyProperties ();
 444                                 foreach (ConfigurationProperty prop in props)
 445                                         writer.WriteAttributeString (prop.Name, prop.ConvertToString (this[prop.Name]));
 446                                 return props.Count > 0;
 447                         }
 448
 449                         bool wroteData = false;
 450
 451                         foreach (PropertyInformation prop in ElementInformation.Properties)
 452                         {
 453                                 if (prop.IsElement || prop.ValueOrigin == PropertyValueOrigin.Default)
 454                                         continue;
 455
 456                                 if (!object.Equals (prop.Value, prop.DefaultValue)) {
 457                                         writer.WriteAttributeString (prop.Name, prop.GetStringValue ());
 458                                         wroteData = true;
 459                                 }
 460                         }
 461
 462                         foreach (PropertyInformation prop in ElementInformation.Properties)
 463                         {
 464                                 if (!prop.IsElement)
 465                                         continue;
 466
 467                                 ConfigurationElement val = (ConfigurationElement) prop.Value;
 468                                 if (val != null && val.HasValues ()) {
 469                                         wroteData = val.SerializeToXmlElement (writer, prop.Name) || wroteData;
 470                                 }
 471                         }
 472                         return wroteData;
 473                 }
 474
 475                 protected internal virtual bool SerializeToXmlElement (
 476                                 XmlWriter writer, string elementName)
 477                 {
 478                         if (elementName != null && elementName != "")
 479                                 writer.WriteStartElement (elementName);
 480                         bool res = SerializeElement (writer, false);
 481                         if (elementName != null && elementName != "")
 482                                 writer.WriteEndElement ();
 483                         return res;
 484                 }
 485
 486                 protected internal virtual void Unmerge (
 487                                 ConfigurationElement source, ConfigurationElement parent,
 488                                 ConfigurationSaveMode updateMode)
 489                 {
 490                         if (parent != null && source.GetType() != parent.GetType())
 491                                 throw new ConfigurationException ("Can't unmerge two elements of different type");
 492
 493                         foreach (PropertyInformation prop in source.ElementInformation.Properties)
 494                         {
 495                                 if (prop.ValueOrigin == PropertyValueOrigin.Default)
 496                                         continue;
 497
 498                                 PropertyInformation unmergedProp = ElementInformation.Properties [prop.Name];
 499
 500                                 object sourceValue = prop.Value;
 501                                 if      (parent == null || !parent.HasValue (prop.Name)) {
 502                                         unmergedProp.Value = sourceValue;
 503                                         continue;
 504                                 }
 505                                 else if (sourceValue != null) {
 506                                         object parentValue = parent [prop.Name];
 507                                         if (prop.IsElement) {
 508                                                 if (parentValue != null) {
 509                                                         ConfigurationElement copy = (ConfigurationElement) unmergedProp.Value;
 510                                                         copy.Unmerge ((ConfigurationElement) sourceValue, (ConfigurationElement) parentValue, updateMode);
 511                                                 }
 512                                                 else
 513                                                         unmergedProp.Value = sourceValue;
 514                                         }
 515                                         else {
 516                                                 if (!object.Equals (sourceValue, parentValue) ||
 517                                                         (updateMode == ConfigurationSaveMode.Full) ||
 518                                                         (updateMode == ConfigurationSaveMode.Modified && prop.ValueOrigin == PropertyValueOrigin.SetHere))
 519                                                         unmergedProp.Value = sourceValue;
 520                                         }
 521                                 }
 522                         }
 523                 }
 524
 525                 internal bool HasValue (string propName)
 526                 {
 527                         PropertyInformation info = ElementInformation.Properties [propName];
 528                         return info != null && info.ValueOrigin != PropertyValueOrigin.Default;
 529                 }
 530
 531                 internal bool IsReadFromConfig (string propName)
 532                 {
 533                         PropertyInformation info = ElementInformation.Properties [propName];
 534                         return info != null && info.ValueOrigin == PropertyValueOrigin.SetHere;
 535                 }
 536         }
 537
 538         internal class ElementMap
 539         {
 540                 static Hashtable elementMaps = new Hashtable ();
 541
 542                 ConfigurationPropertyCollection properties;
 543                 ConfigurationPropertyCollection keyProperties;
 544                 ConfigurationProperty defaultCollectionProperty;
 545
 546                 ConfigurationCollectionAttribute collectionAttribute;
 547
 548                 public static ElementMap GetMap (Type t)
 549                 {
 550                         lock (elementMaps) {
 551                                 ElementMap map = elementMaps [t] as ElementMap;
 552                                 if (map != null) return map;
 553                                 map = new ElementMap (t);
 554                                 elementMaps [t] = map;
 555                                 return map;
 556                         }
 557                 }
 558
 559                 public ElementMap (Type t)
 560                 {
 561                         ReflectProperties (t);
 562                 }
 563
 564                 protected void ReflectProperties (Type t)
 565                 {
 566                         collectionAttribute = Attribute.GetCustomAttribute (t, typeof(ConfigurationCollectionAttribute)) as ConfigurationCollectionAttribute;
 567
 568                         PropertyInfo[] props = t.GetProperties ();
 569                         foreach (PropertyInfo prop in props)
 570                         {
 571                                 ConfigurationPropertyAttribute at = Attribute.GetCustomAttribute (prop, typeof(ConfigurationPropertyAttribute)) as ConfigurationPropertyAttribute;
 572                                 if (at == null) continue;
 573                                 string name = at.Name != null ? at.Name : prop.Name;
 574
 575                                 if (
 576                                     /* if we have no default value, don't bother to check further */
 577                                     at.DefaultValue != null && at.DefaultValue != ConfigurationProperty.NoDefaultValue
 578                                     )
 579                                 {
 580                                         try {
 581                                                 Convert.ChangeType (at.DefaultValue, prop.PropertyType);
 582                                         }
 583                                         catch {
 584                                                 throw new ConfigurationErrorsException (String.Format ("The default value for property '{0}' has a different type than the one of the property itself",
 585                                                                                                        name));
 586                                         }
 587                                 }
 588
 589                                 ConfigurationValidatorAttribute validatorAttr = Attribute.GetCustomAttribute (t, typeof(ConfigurationValidatorAttribute)) as ConfigurationValidatorAttribute;
 590                                 ConfigurationValidatorBase validator = validatorAttr != null ? validatorAttr.ValidatorInstance : new DefaultValidator();
 591
 592                                 TypeConverter converter = TypeDescriptor.GetConverter (prop.PropertyType);
 593                                 ConfigurationProperty cp = new ConfigurationProperty (name, prop.PropertyType, at.DefaultValue, converter, validator, at.Options);
 594
 595                                 cp.CollectionAttribute = Attribute.GetCustomAttribute (prop, typeof(ConfigurationCollectionAttribute)) as ConfigurationCollectionAttribute;
 596
 597                                 if (properties == null) properties = new ConfigurationPropertyCollection ();
 598                                 properties.Add (cp);
 599                         }
 600                 }
 601
 602                 public bool HasProperties
 603                 {
 604                         get { return properties != null && properties.Count > 0; }
 605                 }
 606
 607                 public ConfigurationPropertyCollection Properties
 608                 {
 609                         get {
 610                                 if (properties == null) properties = new ConfigurationPropertyCollection ();
 611                                 return properties;
 612                         }
 613                 }
 614
 615                 public ConfigurationPropertyCollection KeyProperties {
 616                         get {
 617                                 if (keyProperties == null) {
 618                                         keyProperties = new ConfigurationPropertyCollection ();
 619
 620                                         if (properties != null)
 621                                                 foreach (ConfigurationProperty p in properties)
 622                                                         if (p.IsKey) keyProperties.Add (p);
 623                                 }
 624                                 return keyProperties;
 625                         }
 626                 }
 627
 628                 public ConfigurationCollectionAttribute CollectionAttribute {
 629                         get { return collectionAttribute; }
 630                 }
 631
 632                 public ConfigurationProperty DefaultCollectionProperty {
 633                         get {
 634                                 if (defaultCollectionProperty == null) {
 635                                         if (properties != null)
 636                                                 foreach (ConfigurationProperty p in properties) {
 637                                                         if (p.IsDefaultCollection) {
 638                                                                 defaultCollectionProperty = p;
 639                                                                 break;
 640                                                         }
 641                                                 }
 642                                 }
 643                                 return defaultCollectionProperty;
 644                         }
 645                 }
 646         }
 647 }
 648
 649 #endif