/// <summary>
/// Deserializes an object from a BsonReader.
/// </summary>
/// <param name="bsonReader">The BsonReader.</param>
/// <param name="nominalType">The nominal type of the object.</param>
/// <param name="options">The serialization options.</param>
/// <returns>An object.</returns>
public override object Deserialize(
BsonReader bsonReader,
Type nominalType,
IBsonSerializationOptions options
) {
if (nominalType != typeof(object)) {
var message = string.Format("ObjectSerializer called for nominal type {0}.", nominalType.FullName);
throw new InvalidOperationException(message);
}
var bsonType = bsonReader.CurrentBsonType;
if (bsonType == BsonType.Null) {
bsonReader.ReadNull();
return null;
} else if (bsonType == BsonType.Document) {
var bookmark = bsonReader.GetBookmark();
bsonReader.ReadStartDocument();
if (bsonReader.ReadBsonType() == BsonType.EndOfDocument) {
bsonReader.ReadEndDocument();
return new object();
} else {
bsonReader.ReturnToBookmark(bookmark);
}
}
var discriminatorConvention = BsonDefaultSerializer.LookupDiscriminatorConvention(typeof(object));
var actualType = discriminatorConvention.GetActualType(bsonReader, typeof(object));
if (actualType == typeof(object)) {
var message = string.Format("Unable to determine actual type of object to deserialize. NominalType is System.Object and BsonType is {0}.", bsonType);
throw new FileFormatException(message);
}
var serializer = BsonSerializer.LookupSerializer(actualType);
return serializer.Deserialize(bsonReader, nominalType, actualType, null);
}
public void TestBookmark() {
var json = "{ \"x\" : 1, \"y\" : 2 }";
using (bsonReader = BsonReader.Create(json)) {
// do everything twice returning to bookmark in between
var bookmark = bsonReader.GetBookmark();
Assert.AreEqual(BsonType.Document, bsonReader.ReadBsonType());
bsonReader.ReturnToBookmark(bookmark);
Assert.AreEqual(BsonType.Document, bsonReader.ReadBsonType());
bookmark = bsonReader.GetBookmark();
bsonReader.ReadStartDocument();
bsonReader.ReturnToBookmark(bookmark);
bsonReader.ReadStartDocument();
bookmark = bsonReader.GetBookmark();
Assert.AreEqual(BsonType.Int32, bsonReader.ReadBsonType());
bsonReader.ReturnToBookmark(bookmark);
Assert.AreEqual(BsonType.Int32, bsonReader.ReadBsonType());
bookmark = bsonReader.GetBookmark();
Assert.AreEqual("x", bsonReader.ReadName());
bsonReader.ReturnToBookmark(bookmark);
Assert.AreEqual("x", bsonReader.ReadName());
bookmark = bsonReader.GetBookmark();
Assert.AreEqual(1, bsonReader.ReadInt32());
bsonReader.ReturnToBookmark(bookmark);
Assert.AreEqual(1, bsonReader.ReadInt32());
bookmark = bsonReader.GetBookmark();
Assert.AreEqual(BsonType.Int32, bsonReader.ReadBsonType());
bsonReader.ReturnToBookmark(bookmark);
Assert.AreEqual(BsonType.Int32, bsonReader.ReadBsonType());
bookmark = bsonReader.GetBookmark();
Assert.AreEqual("y", bsonReader.ReadName());
bsonReader.ReturnToBookmark(bookmark);
Assert.AreEqual("y", bsonReader.ReadName());
bookmark = bsonReader.GetBookmark();
Assert.AreEqual(2, bsonReader.ReadInt32());
bsonReader.ReturnToBookmark(bookmark);
Assert.AreEqual(2, bsonReader.ReadInt32());
bookmark = bsonReader.GetBookmark();
Assert.AreEqual(BsonType.EndOfDocument, bsonReader.ReadBsonType());
bsonReader.ReturnToBookmark(bookmark);
Assert.AreEqual(BsonType.EndOfDocument, bsonReader.ReadBsonType());
bookmark = bsonReader.GetBookmark();
bsonReader.ReadEndDocument();
bsonReader.ReturnToBookmark(bookmark);
bsonReader.ReadEndDocument();
Assert.AreEqual(BsonReaderState.Done, bsonReader.State);
}
Assert.AreEqual(json, BsonSerializer.Deserialize<BsonDocument>(new StringReader(json)).ToJson());
}
public Type GetActualType(BsonReader bsonReader, Type nominalType)
{
var bookmark = bsonReader.GetBookmark();
bsonReader.ReadStartDocument();
var actualType = nominalType;
if (bsonReader.FindElement("Type"))
{
var discriminator = BsonValue.ReadFrom(bsonReader);
actualType = BsonSerializer.LookupActualType(nominalType, discriminator);
}
bsonReader.ReturnToBookmark(bookmark);
return actualType;
}
public Type GetActualType(
BsonReader bsonReader,
Type nominalType
) {
var bookmark = bsonReader.GetBookmark();
bsonReader.ReadStartDocument();
var actualType = nominalType;
while(bsonReader.ReadBsonType() != BsonType.EndOfDocument) {
var name = bsonReader.ReadName();
if(name == "OnlyInB") {
actualType = typeof(B);
break;
}
else if(name == "OnlyInC") {
actualType = typeof(C);
break;
}
bsonReader.SkipValue();
}
bsonReader.ReturnToBookmark(bookmark);
return actualType;
}
// private methods
private Type GetActualType(BsonReader bsonReader)
{
var bookmark = bsonReader.GetBookmark();
bsonReader.ReadStartDocument();
if (bsonReader.FindElement("type"))
{
var type = bsonReader.ReadString();
bsonReader.ReturnToBookmark(bookmark);
switch (type)
{
case "link": return typeof(GeoJsonLinkedCoordinateReferenceSystem);
case "name": return typeof(GeoJsonNamedCoordinateReferenceSystem);
default:
var message = string.Format("The type field of the GeoJsonCoordinateReferenceSystem is not valid: '{0}'.", type);
throw new FormatException(message);
}
}
else
{
throw new FormatException("GeoJsonCoordinateReferenceSystem object is missing the type field.");
}
}
public override object Deserialize(
BsonReader bsonReader,
Type nominalType
)
{
if (nominalType != typeof(object)) {
var message = string.Format("ObjectSerializer called for type: {0}", nominalType.FullName);
throw new InvalidOperationException(message);
}
var bsonType = bsonReader.CurrentBsonType;
if (bsonType == BsonType.Null) {
bsonReader.ReadNull();
return null;
} else if (bsonType == BsonType.Document) {
var bookmark = bsonReader.GetBookmark();
bsonReader.ReadStartDocument();
switch (bsonReader.ReadBsonType()) {
case BsonType.EndOfDocument:
bsonReader.ReadEndDocument();
return new object();
default:
bsonReader.ReturnToBookmark(bookmark);
var discriminatorConvention = BsonDefaultSerializer.LookupDiscriminatorConvention(typeof(object));
var actualType = discriminatorConvention.GetActualType(bsonReader, typeof(object));
if (actualType == typeof(object)) {
throw new BsonSerializationException("Unable to determine actual type of document to deserialize");
}
var serializer = BsonSerializer.LookupSerializer(actualType);
return serializer.Deserialize(bsonReader, nominalType, actualType);
}
} else {
var message = string.Format("Cannot deserialize an object from BsonType: {0}", bsonType);
throw new FileFormatException(message);
}
}
// public methods
/// <summary>
/// Gets the actual type of an object by reading the discriminator from a BsonReader.
/// </summary>
/// <param name="bsonReader">The reader.</param>
/// <param name="nominalType">The nominal type.</param>
/// <returns>The actual type.</returns>
public Type GetActualType(BsonReader bsonReader, Type nominalType)
{
// the BsonReader is sitting at the value whose actual type needs to be found
var bsonType = bsonReader.GetCurrentBsonType();
if (bsonType == BsonType.Document)
{
// ensure KnownTypes of nominalType are registered (so IsTypeDiscriminated returns correct answer)
BsonSerializer.EnsureKnownTypesAreRegistered(nominalType);
// we can skip looking for a discriminator if nominalType has no discriminated sub types
if (BsonSerializer.IsTypeDiscriminated(nominalType))
{
var bookmark = bsonReader.GetBookmark();
bsonReader.ReadStartDocument();
var actualType = nominalType;
if (bsonReader.FindElement(_elementName))
{
var context = BsonDeserializationContext.CreateRoot<BsonValue>(bsonReader);
var discriminator = BsonValueSerializer.Instance.Deserialize(context);
if (discriminator.IsBsonArray)
{
discriminator = discriminator.AsBsonArray.Last(); // last item is leaf class discriminator
}
actualType = BsonSerializer.LookupActualType(nominalType, discriminator);
}
bsonReader.ReturnToBookmark(bookmark);
return actualType;
}
}
return nominalType;
}
// public methods
/// <summary>
/// Gets the actual type of an object by reading the discriminator from a BsonReader.
/// </summary>
/// <param name="bsonReader">The reader.</param>
/// <param name="nominalType">The nominal type.</param>
/// <returns>The actual type.</returns>
public Type GetActualType(BsonReader bsonReader, Type nominalType)
{
// the BsonReader is sitting at the value whose actual type needs to be found
var bsonType = bsonReader.CurrentBsonType;
if (bsonReader.State == BsonReaderState.Value)
{
Type primitiveType = null;
switch (bsonType)
{
case BsonType.Boolean: primitiveType = typeof(bool); break;
case BsonType.Binary:
var bookmark = bsonReader.GetBookmark();
byte[] bytes;
BsonBinarySubType subType;
bsonReader.ReadBinaryData(out bytes, out subType);
if (subType == BsonBinarySubType.UuidStandard || subType == BsonBinarySubType.UuidLegacy)
{
primitiveType = typeof(Guid);
}
bsonReader.ReturnToBookmark(bookmark);
break;
case BsonType.DateTime: primitiveType = typeof(DateTime); break;
case BsonType.Double: primitiveType = typeof(double); break;
case BsonType.Int32: primitiveType = typeof(int); break;
case BsonType.Int64: primitiveType = typeof(long); break;
case BsonType.ObjectId: primitiveType = typeof(ObjectId); break;
case BsonType.String: primitiveType = typeof(string); break;
}
if (primitiveType != null && nominalType.IsAssignableFrom(primitiveType))
{
return primitiveType;
}
}
if (bsonType == BsonType.Document)
{
// ensure KnownTypes of nominalType are registered (so IsTypeDiscriminated returns correct answer)
BsonDefaultSerializer.EnsureKnownTypesAreRegistered(nominalType);
// we can skip looking for a discriminator if nominalType has no discriminated sub types
if (BsonDefaultSerializer.IsTypeDiscriminated(nominalType))
{
var bookmark = bsonReader.GetBookmark();
bsonReader.ReadStartDocument();
var actualType = nominalType;
if (bsonReader.FindElement(_elementName))
{
var discriminator = BsonValue.ReadFrom(bsonReader);
if (discriminator.IsBsonArray)
{
discriminator = discriminator.AsBsonArray.Last(); // last item is leaf class discriminator
}
actualType = BsonDefaultSerializer.LookupActualType(nominalType, discriminator);
}
bsonReader.ReturnToBookmark(bookmark);
return actualType;
}
}
return nominalType;
}
private bool IsCSharpNullRepresentation(BsonReader bsonReader)
{
var bookmark = bsonReader.GetBookmark();
bsonReader.ReadStartDocument();
var bsonType = bsonReader.ReadBsonType();
if (bsonType == BsonType.Boolean)
{
var name = bsonReader.ReadName();
if (name == "_csharpnull" || name == "$csharpnull")
{
var value = bsonReader.ReadBoolean();
if (value)
{
bsonType = bsonReader.ReadBsonType();
if (bsonType == BsonType.EndOfDocument)
{
bsonReader.ReadEndDocument();
return true;
}
}
}
}
bsonReader.ReturnToBookmark(bookmark);
return false;
}
// public methods
/// <summary>
/// Gets the actual type of an object by reading the discriminator from a BsonReader.
/// </summary>
/// <param name="bsonReader">The reader.</param>
/// <param name="nominalType">The nominal type.</param>
/// <returns>The actual type.</returns>
public Type GetActualType(BsonReader bsonReader, Type nominalType)
{
// the BsonReader is sitting at the value whose actual type needs to be found
var bsonType = bsonReader.GetCurrentBsonType();
if (bsonReader.State == BsonReaderState.Value)
{
Type primitiveType = null;
switch (bsonType)
{
case BsonType.Boolean: primitiveType = typeof(bool); break;
case BsonType.Binary:
var bookmark = bsonReader.GetBookmark();
var binaryData = bsonReader.ReadBinaryData();
var subType = binaryData.SubType;
if (subType == BsonBinarySubType.UuidStandard || subType == BsonBinarySubType.UuidLegacy)
{
primitiveType = typeof(Guid);
}
bsonReader.ReturnToBookmark(bookmark);
break;
case BsonType.DateTime: primitiveType = typeof(DateTime); break;
case BsonType.Double: primitiveType = typeof(double); break;
case BsonType.Int32: primitiveType = typeof(int); break;
case BsonType.Int64: primitiveType = typeof(long); break;
case BsonType.ObjectId: primitiveType = typeof(ObjectId); break;
case BsonType.String: primitiveType = typeof(string); break;
}
// Type.IsAssignableFrom is extremely expensive, always perform a direct type check before calling Type.IsAssignableFrom
if (primitiveType != null && (primitiveType == nominalType || nominalType.IsAssignableFrom(primitiveType)))
{
return primitiveType;
}
}
if (bsonType == BsonType.Document)
{
var bookmark = bsonReader.GetBookmark();
bsonReader.ReadStartDocument();
var actualType = nominalType;
if (bsonReader.FindElement(_elementName))
{
var context = BsonDeserializationContext.CreateRoot<BsonValue>(bsonReader);
var discriminator = BsonValueSerializer.Instance.Deserialize(context);
if (discriminator.IsBsonArray)
{
discriminator = discriminator.AsBsonArray.Last(); // last item is leaf class discriminator
}
actualType = BsonSerializer.LookupActualType(nominalType, discriminator);
}
bsonReader.ReturnToBookmark(bookmark);
return actualType;
}
return nominalType;
}
// BsonReader is sitting at the value whose actual type needs to be found
public Type GetActualType(
BsonReader bsonReader,
Type nominalType
)
{
var bsonType = bsonReader.CurrentBsonType;
if (bsonReader.State == BsonReaderState.Value) {
Type primitiveType = null;
switch (bsonType) {
case BsonType.Boolean: primitiveType = typeof(bool); break;
case BsonType.Binary:
var bookmark = bsonReader.GetBookmark();
byte[] bytes;
BsonBinarySubType subType;
bsonReader.ReadBinaryData(out bytes, out subType);
if (subType == BsonBinarySubType.Uuid && bytes.Length == 16) {
primitiveType = typeof(Guid);
}
bsonReader.ReturnToBookmark(bookmark);
break;
case BsonType.DateTime: primitiveType = typeof(DateTime); break;
case BsonType.Double: primitiveType = typeof(double); break;
case BsonType.Int32: primitiveType = typeof(int); break;
case BsonType.Int64: primitiveType = typeof(long); break;
case BsonType.ObjectId: primitiveType = typeof(ObjectId); break;
case BsonType.String: primitiveType = typeof(string); break;
}
if (primitiveType != null && nominalType.IsAssignableFrom(primitiveType)) {
return primitiveType;
}
}
if (bsonType == BsonType.Document) {
var bookmark = bsonReader.GetBookmark();
bsonReader.ReadStartDocument();
var actualType = nominalType;
if (bsonReader.FindElement(elementName)) {
var discriminator = BsonValue.ReadFrom(bsonReader);
if (discriminator.IsBsonArray) {
discriminator = discriminator.AsBsonArray.Last(); // last item is leaf class discriminator
}
actualType = BsonDefaultSerializer.LookupActualType(nominalType, discriminator);
}
bsonReader.ReturnToBookmark(bookmark);
return actualType;
}
return nominalType;
}
public override object Deserialize(BsonReader bsonReader, Type nominalType, IBsonSerializationOptions options)
{
var bsonType = bsonReader.CurrentBsonType;
if (bsonType == BsonType.Null)
{
bsonReader.ReadNull();
return null;
}
else if (bsonType == BsonType.Document)
{
var os = new ObjectSerializer();
MongoDynamic md = new MongoDynamic();
bsonReader.ReadStartDocument();
Dictionary<string, Type> typeMap = null;
// scan document first to find interfaces
{
var bookMark = bsonReader.GetBookmark();
if (bsonReader.FindElement(MongoDynamic.InterfacesField))
{
md[MongoDynamic.InterfacesField] = BsonSerializer.Deserialize<BsonValue>(bsonReader).AsBsonArray.Select(x => x.AsString);
typeMap = md.GetTypeMap();
}
else
{
throw new FormatException("No interfaces defined for this dynamic object - can't deserialize it");
}
bsonReader.ReturnToBookmark(bookMark);
}
while (bsonReader.ReadBsonType() != BsonType.EndOfDocument)
{
var name = bsonReader.ReadName();
if (name == "_id")
{
//md[name] = BsonValue.ReadFrom(bsonReader).AsObjectId;
md[name] = BsonSerializer.Deserialize<ObjectId>(bsonReader);
}
else if (name == MongoDynamic.InterfacesField)
{
// Read it and ignore it, we already have it
//BsonValue.ReadFrom(bsonReader);
BsonSerializer.Deserialize<ObjectId>(bsonReader);
}
else
{
if (typeMap == null) throw new FormatException("No interfaces define for this dynamic object - can't deserialize");
// lookup the type for this element according to the interfaces
Type elementType;
if (typeMap.TryGetValue(name, out elementType))
{
var value = BsonSerializer.Deserialize(bsonReader, elementType);
md[name] = value;
}
else
{
// This is a value that is no longer in the interface, maybe a column you removed
// not really much we can do with it ... but we need to read it and move on
var value = BsonSerializer.Deserialize(bsonReader, typeof(object));
md[name] = value;
// As with all databases, removing elements from the schema is always going to cause problems ...
}
}
}
bsonReader.ReadEndDocument();
return md;
}
else
{
var message = string.Format("Can't deserialize a {0} from BsonType {1}.", nominalType.FullName, bsonType);
throw new FormatException(message);
}
}
