mcs/class/System.Runtime.Serialization/System.Runtime.Serialization/XmlFormatterDeserializer.cs

   1 //
   2 // XmlFormatterDeserializer.cs
   3 //
   4 // Author:
   5 //      Atsushi Enomoto <atsushi@ximian.com>
   6 //
   7 // Copyright (C) 2005 Novell, Inc.  http://www.novell.com
   8 //
   9 // Permission is hereby granted, free of charge, to any person obtaining
  10 // a copy of this software and associated documentation files (the
  11 // "Software"), to deal in the Software without restriction, including
  12 // without limitation the rights to use, copy, modify, merge, publish,
  13 // distribute, sublicense, and/or sell copies of the Software, and to
  14 // permit persons to whom the Software is furnished to do so, subject to
  15 // the following conditions:
  16 //
  17 // The above copyright notice and this permission notice shall be
  18 // included in all copies or substantial portions of the Software.
  19 //
  20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  27 //
  28 #if NET_2_0
  29 using System;
  30 using System.Collections.Generic;
  31 using System.IO;
  32 using System.Linq;
  33 using System.Reflection;
  34 using System.Runtime.Serialization.Formatters.Binary;
  35 using System.Xml;
  36 using System.Xml.Schema;
  37
  38 using QName = System.Xml.XmlQualifiedName;
  39
  40 namespace System.Runtime.Serialization
  41 {
  42         internal class XmlFormatterDeserializer
  43         {
  44                 KnownTypeCollection types;
  45                 IDataContractSurrogate surrogate;
  46                 DataContractResolver resolver, default_resolver; // new in 4.0.
  47                 // 3.5 SP1 supports deserialization by reference (id->obj).
  48                 // Though unlike XmlSerializer, it does not support forward-
  49                 // reference resolution i.e. a referenced object must appear
  50                 // before any references to it.
  51                 Dictionary<string,object> references = new Dictionary<string,object> ();
  52                 Dictionary<QName,Type> resolved_qnames = new Dictionary<QName,Type> ();
  53
  54                 public static object Deserialize (XmlReader reader, Type declaredType,
  55                         KnownTypeCollection knownTypes, IDataContractSurrogate surrogate, DataContractResolver resolver, DataContractResolver defaultResolver,
  56                         string name, string ns, bool verifyObjectName)
  57                 {
  58                         reader.MoveToContent ();
  59                         if (verifyObjectName)
  60                                 if (reader.NodeType != XmlNodeType.Element ||
  61                                     reader.LocalName != name ||
  62                                     reader.NamespaceURI != ns)
  63                                         throw new SerializationException (String.Format ("Expected element '{0}' in namespace '{1}', but found {2} node '{3}' in namespace '{4}'", name, ns, reader.NodeType, reader.LocalName, reader.NamespaceURI));
  64 //                              Verify (knownTypes, declaredType, name, ns, reader);
  65                         return new XmlFormatterDeserializer (knownTypes, surrogate, resolver, defaultResolver).Deserialize (declaredType, reader);
  66                 }
  67
  68                 // Verify the top element name and namespace.
  69                 private static void Verify (KnownTypeCollection knownTypes, Type type, string name, string Namespace, XmlReader reader)
  70                 {
  71                         QName graph_qname = new QName (reader.LocalName, reader.NamespaceURI);
  72                         if (graph_qname.Name == name && graph_qname.Namespace == Namespace)
  73                                 return;
  74
  75                         // <BClass .. i:type="EClass" >..</BClass>
  76                         // Expecting type EClass : allowed
  77                         // See test Serialize1b, and Serialize1c (for
  78                         // negative cases)
  79
  80                         // Run through inheritance heirarchy ..
  81                         for (Type baseType = type; baseType != null; baseType = baseType.BaseType)
  82                                 if (knownTypes.GetQName (baseType) == graph_qname)
  83                                         return;
  84
  85                         QName typeQName = knownTypes.GetQName (type);
  86                         throw new SerializationException (String.Format (
  87                                 "Expecting element '{0}' from namespace '{1}'. Encountered 'Element' with name '{2}', namespace '{3}'",
  88                                 typeQName.Name, typeQName.Namespace, graph_qname.Name, graph_qname.Namespace));
  89                 }
  90
  91                 private XmlFormatterDeserializer (
  92                         KnownTypeCollection knownTypes,
  93                         IDataContractSurrogate surrogate,
  94                         DataContractResolver resolver,
  95                         DataContractResolver defaultResolver)
  96                 {
  97                         this.types = knownTypes;
  98                         this.surrogate = surrogate;
  99                         this.resolver = resolver;
 100                         this.default_resolver = defaultResolver;
 101                 }
 102
 103                 public Dictionary<string,object> References {
 104                         get { return references; }
 105                 }
 106
 107                 XmlDocument document;
 108
 109                 XmlDocument XmlDocument {
 110                         get { return (document = document ?? new XmlDocument ()); }
 111                 }
 112
 113                 // This method handles z:Ref, xsi:nil and primitive types, and then delegates to DeserializeByMap() for anything else.
 114
 115                 public object Deserialize (Type type, XmlReader reader)
 116                 {
 117                         if (type == typeof (XmlElement))
 118                                 return XmlDocument.ReadNode (reader);
 119                         else if (type == typeof (XmlNode [])) {
 120                                 reader.ReadStartElement ();
 121                                 var l = new List<XmlNode> ();
 122                                 for(; !reader.EOF && reader.NodeType != XmlNodeType.EndElement; reader.MoveToContent ())
 123                                         l.Add (XmlDocument.ReadNode (reader));
 124                                 reader.ReadEndElement ();
 125                                 return l.ToArray ();
 126                         }
 127                         QName graph_qname = null;
 128
 129                         if (type.IsGenericType && type.GetGenericTypeDefinition () == typeof (Nullable<>)) {
 130                                 Type internal_type = type.GetGenericArguments () [0];
 131
 132                                 if (types.FindUserMap(internal_type) != null) {
 133                                         graph_qname = types.GetQName (internal_type);
 134                                 }
 135                         }
 136
 137                         if (graph_qname == null)
 138                                 graph_qname = types.GetQName (type);
 139
 140                         string itype = reader.GetAttribute ("type", XmlSchema.InstanceNamespace);
 141                         if (itype != null) {
 142                                 string [] parts = itype.Split (':');
 143                                 if (parts.Length > 1)
 144                                         graph_qname = new QName (parts [1], reader.LookupNamespace (reader.NameTable.Get (parts [0])));
 145                                 else
 146                                         graph_qname = new QName (itype, reader.LookupNamespace (String.Empty));
 147                         }
 148
 149                         string label = reader.GetAttribute ("Ref", KnownTypeCollection.MSSimpleNamespace);
 150                         if (label != null) {
 151                                 object o;
 152                                 if (!references.TryGetValue (label, out o))
 153                                         throw new SerializationException (String.Format ("Deserialized object with reference Id '{0}' was not found", label));
 154                                 reader.Skip ();
 155                                 return o;
 156                         }
 157
 158                         bool isNil = reader.GetAttribute ("nil", XmlSchema.InstanceNamespace) == "true";
 159
 160                         if (isNil) {
 161                                 reader.Skip ();
 162                                 if (!type.IsValueType || type == typeof (void))
 163                                         return null;
 164                                 else if (type.IsGenericType && type.GetGenericTypeDefinition () == typeof (Nullable<>))
 165                                         return null;
 166                                 else
 167                                         throw new SerializationException (String.Format ("Value type {0} cannot be null.", type));
 168                         }
 169
 170                         if (resolver != null) {
 171                                 Type t;
 172                                 if (resolved_qnames.TryGetValue (graph_qname, out t))
 173                                         type = t;
 174                                 else { // i.e. resolve name only once.
 175                                         type = resolver.ResolveName (graph_qname.Name, graph_qname.Namespace, type, default_resolver) ?? type;
 176                                         resolved_qnames.Add (graph_qname, type);
 177                                         types.Add (type);
 178                                 }
 179                         }
 180
 181                         if (KnownTypeCollection.GetPrimitiveTypeFromName (graph_qname) != null) {
 182                                 string id = reader.GetAttribute ("Id", KnownTypeCollection.MSSimpleNamespace);
 183
 184                                 object ret = DeserializePrimitive (type, reader, graph_qname);
 185
 186                                 if (id != null) {
 187                                         if (references.ContainsKey (id))
 188                                                 throw new InvalidOperationException (String.Format ("Object with Id '{0}' already exists as '{1}'", id, references [id]));
 189                                         references.Add (id, ret);
 190                                 }
 191                                 return ret;
 192                         }
 193
 194                         return DeserializeByMap (graph_qname, type, reader);
 195                 }
 196
 197                 object DeserializePrimitive (Type type, XmlReader reader, QName qname)
 198                 {
 199                         bool isDateTimeOffset = false;
 200                         // Handle DateTimeOffset type and DateTimeOffset?.
 201                         if (type == typeof (DateTimeOffset))
 202                                 isDateTimeOffset = true;
 203                         else if(type.IsGenericType && type.GetGenericTypeDefinition () == typeof (Nullable<>))
 204                                 isDateTimeOffset = type.GetGenericArguments () [0] == typeof (DateTimeOffset);
 205                         // It is the only exceptional type that does not serialize to string but serializes into complex element.
 206                         if (isDateTimeOffset) {
 207                                 if (reader.IsEmptyElement) {
 208                                         reader.Read ();
 209                                         return default (DateTimeOffset);
 210                                 }
 211                                 reader.ReadStartElement ();
 212                                 reader.MoveToContent ();
 213                                 var date = reader.ReadElementContentAsDateTime ("DateTime", KnownTypeCollection.DefaultClrNamespaceSystem);
 214                                 var off = TimeSpan.FromMinutes (reader.ReadElementContentAsInt ("OffsetMinutes", KnownTypeCollection.DefaultClrNamespaceSystem));
 215                                 reader.MoveToContent ();
 216                                 reader.ReadEndElement ();
 217                                 return new DateTimeOffset (DateTime.SpecifyKind (date.ToUniversalTime () + off, DateTimeKind.Unspecified), off);
 218                         }
 219
 220                         string value;
 221                         if (reader.IsEmptyElement) {
 222                                 reader.Read (); // advance
 223                                 if (type.IsValueType)
 224                                         return Activator.CreateInstance (type);
 225                                 else
 226                                         // FIXME: Workaround for creating empty objects of the correct type.
 227                                         value = String.Empty;
 228                         }
 229                         else
 230                                 value = reader.ReadElementContentAsString ();
 231                         return KnownTypeCollection.PredefinedTypeStringToObject (value, qname.Name, reader);
 232                 }
 233
 234                 object DeserializeByMap (QName name, Type type, XmlReader reader)
 235                 {
 236                         SerializationMap map = null;
 237                         // List<T> and T[] have the same QName, use type to find map work better.
 238                         if(name.Name.StartsWith ("ArrayOf", StringComparison.Ordinal) || resolved_qnames.ContainsKey (name))
 239                                 map = types.FindUserMap (type);
 240                         else
 241                                 map = types.FindUserMap (name); // use type when the name is "resolved" one. Otherwise use name (there are cases that type cannot be resolved by type).
 242                         if (map == null && (name.Name.StartsWith ("ArrayOf", StringComparison.Ordinal) ||
 243                             name.Namespace == KnownTypeCollection.MSArraysNamespace ||
 244                             name.Namespace.StartsWith (KnownTypeCollection.DefaultClrNamespaceBase, StringComparison.Ordinal))) {
 245                                 var it = GetTypeFromNamePair (name.Name, name.Namespace);
 246                                 types.Add (it);
 247                                 map = types.FindUserMap (name);
 248                         }
 249                         if (map == null)
 250                                 throw new SerializationException (String.Format ("Unknown type {0} is used for DataContract with reference of name {1}. Any derived types of a data contract or a data member should be added to KnownTypes.", type, name));
 251
 252                         return map.DeserializeObject (reader, this);
 253                 }
 254
 255                 Type GetTypeFromNamePair (string name, string ns)
 256                 {
 257                         Type p = KnownTypeCollection.GetPrimitiveTypeFromName (new QName (name, ns));
 258                         if (p != null)
 259                                 return p;
 260                         bool makeArray = false;
 261                         if (name.StartsWith ("ArrayOf", StringComparison.Ordinal)) {
 262                                 name = name.Substring (7); // strip "ArrayOf"
 263                                 if (ns == KnownTypeCollection.MSArraysNamespace)
 264                                         return GetTypeFromNamePair (name, String.Empty).MakeArrayType ();
 265                                 makeArray = true;
 266                         }
 267
 268                         string dnsb = KnownTypeCollection.DefaultClrNamespaceBase;
 269                         string clrns = ns.StartsWith (dnsb, StringComparison.Ordinal) ?  ns.Substring (dnsb.Length) : ns;
 270
 271                         foreach (var ass in AppDomain.CurrentDomain.GetAssemblies ()) {
 272                                 Type [] types;
 273
 274                                 types = ass.GetTypes ();
 275                                 if (types == null)
 276                                         continue;
 277
 278                                 foreach (var t in types) {
 279                                         // there can be null entries or exception throw to access the attribute -
 280                                         // at least when some referenced assemblies could not be loaded (affects moonlight)
 281                                         if (t == null)
 282                                                 continue;
 283
 284                                         try {
 285                                                 var dca = t.GetCustomAttribute<DataContractAttribute> (true);
 286                                                 if (dca != null && dca.Name == name && dca.Namespace == ns)
 287                                                         return makeArray ? t.MakeArrayType () : t;
 288                                         }
 289                                         catch (TypeLoadException tle) {
 290                                                 Console.Error.WriteLine (tle);
 291                                                 continue;
 292                                         }
 293                                         catch (FileNotFoundException fnfe) {
 294                                                 Console.Error.WriteLine (fnfe);
 295                                                 continue;
 296                                         }
 297
 298                                         if (clrns != null && t.Name == name && t.Namespace == clrns)
 299                                                 return makeArray ? t.MakeArrayType () : t;
 300                                 }
 301                         }
 302                         throw new XmlException (String.Format ("Type not found; name: {0}, namespace: {1}", name, ns));
 303                 }
 304         }
 305 }
 306 #endif