private IBsonSerializer BuildProjectedSerializer(ProjectionMapping mapping)
{
// We are building a serializer specifically for a projected type based
// on serialization information collected from other serializers.
// We cannot cache this in the serializer registry because the compiler reuses
// the same anonymous type definition in different contexts as long as they
// are structurally equatable. As such, it might be that two different queries
// projecting the same shape might need to be deserialized differently.
var classMap = BuildClassMap(mapping.Expression.Type, mapping);
var mappedParameters = mapping.Members
.Where(x => x.Parameter != null)
.OrderBy(x => x.Parameter.Position)
.Select(x => x.Member)
.ToList();
if (mappedParameters.Count > 0)
{
classMap.MapConstructor(mapping.Constructor)
.SetArguments(mappedParameters);
}
var serializerType = typeof(BsonClassMapSerializer <>).MakeGenericType(mapping.Expression.Type);
return((IBsonSerializer)Activator.CreateInstance(serializerType, classMap.Freeze()));
}
private IBsonSerializer BuildProjectedSerializer(ProjectionMapping mapping)
{
// We are building a serializer specifically for a projected type based
// on serialization information collected from other serializers.
// We cannot cache this in the serializer registry because the compiler reuses
// the same anonymous type definition in different contexts as long as they
// are structurally equatable. As such, it might be that two different queries
// projecting the same shape might need to be deserialized differently.
var classMap = BuildClassMap(mapping.Expression.Type, mapping);
var mappedParameters = mapping.Members
.Where(x => x.Parameter != null)
.OrderBy(x => x.Parameter.Position)
.Select(x => x.Member)
.ToList();
if (mappedParameters.Count > 0)
{
classMap.MapConstructor(mapping.Constructor)
.SetArguments(mappedParameters);
}
var serializerType = typeof(BsonClassMapSerializer<>).MakeGenericType(mapping.Expression.Type);
return (IBsonSerializer)Activator.CreateInstance(serializerType, classMap.Freeze());
}
private IBsonSerializer BuildProjectedSerializer(ProjectionMapping mapping)
{
// We are building a serializer specifically for a projected type based
// on serialization information collected from other serializers.
// We cannot cache this in the serializer registry because the compiler reuses
// the same anonymous type definition in different contexts as long as they
// are structurally equatable. As such, it might be that two different queries
// projecting the same shape might need to be deserialized differently.
var classMapType = typeof(BsonClassMap <>).MakeGenericType(mapping.Expression.Type);
BsonClassMap classMap = (BsonClassMap)Activator.CreateInstance(classMapType);
foreach (var memberMapping in mapping.Members)
{
var serializationExpression = memberMapping.Expression as ISerializationExpression;
if (serializationExpression == null)
{
var serializer = Build(memberMapping.Expression);
var serializationInfo = new BsonSerializationInfo(
memberMapping.Member.Name,
serializer,
GetMemberType(memberMapping.Member));
serializationExpression = new SerializationExpression(
memberMapping.Expression,
serializationInfo);
}
var memberMap = classMap.MapMember(memberMapping.Member)
.SetSerializer(serializationExpression.SerializationInfo.Serializer)
.SetElementName(memberMapping.Member.Name);
if (classMap.IdMemberMap == null && serializationExpression is GroupIdExpression)
{
classMap.SetIdMember(memberMap);
}
}
var mappedParameters = mapping.Members
.Where(x => x.Parameter != null)
.OrderBy(x => x.Parameter.Position)
.Select(x => x.Member)
.ToList();
if (mappedParameters.Count > 0)
{
classMap.MapConstructor(mapping.Constructor)
.SetArguments(mappedParameters);
}
var serializerType = typeof(BsonClassMapSerializer <>).MakeGenericType(mapping.Expression.Type);
return((IBsonSerializer)Activator.CreateInstance(serializerType, classMap.Freeze()));
}
private BsonClassMap BuildClassMap(Type type, ProjectionMapping mapping)
{
if (type == null || type == typeof(object))
{
return(null);
}
var baseClassMap = BuildClassMap(type.BaseType, mapping);
if (baseClassMap != null)
{
baseClassMap.Freeze();
}
var classMap = new BsonClassMap(type, baseClassMap);
foreach (var memberMapping in mapping.Members.Where(x => x.Member.DeclaringType == type))
{
var serializationExpression = memberMapping.Expression as ISerializationExpression;
if (serializationExpression == null)
{
var serializer = Build(memberMapping.Expression);
var serializationInfo = new BsonSerializationInfo(
memberMapping.Member.Name,
serializer,
GetMemberType(memberMapping.Member));
serializationExpression = new SerializationExpression(
memberMapping.Expression,
serializationInfo);
}
var memberMap = classMap.MapMember(memberMapping.Member)
.SetSerializer(serializationExpression.SerializationInfo.Serializer)
.SetElementName(memberMapping.Member.Name);
if (classMap.IdMemberMap == null && serializationExpression is GroupIdExpression)
{
classMap.SetIdMember(memberMap);
}
}
return(classMap);
}
private BsonClassMap BuildClassMap(Type type, ProjectionMapping mapping)
{
if (type == null || type == typeof(object))
{
return null;
}
var baseClassMap = BuildClassMap(type.GetTypeInfo().BaseType, mapping);
if (baseClassMap != null)
{
baseClassMap.Freeze();
}
var classMap = new BsonClassMap(type, baseClassMap);
foreach (var memberMapping in mapping.Members.Where(x => x.Member.DeclaringType == type))
{
var serializationExpression = memberMapping.Expression as SerializationExpression;
if (serializationExpression == null)
{
var serializer = Build(memberMapping.Expression);
serializationExpression = new FieldExpression(
memberMapping.Member.Name,
serializer,
memberMapping.Expression);
}
var memberMap = classMap.MapMember(memberMapping.Member)
.SetSerializer(serializationExpression.Serializer)
.SetElementName(memberMapping.Member.Name);
if (classMap.IdMemberMap == null && serializationExpression is GroupingKeyExpression)
{
classMap.SetIdMember(memberMap);
}
}
return classMap;
}
private BsonValue TranslateMapping(ProjectionMapping mapping)
{
BsonDocument doc = new BsonDocument();
bool hasId = false;
foreach (var memberMapping in mapping.Members)
{
var value = TranslateValue(memberMapping.Expression);
string name = memberMapping.Member.Name;
if (!hasId && memberMapping.Expression is GroupingKeyExpression)
{
name = "_id";
hasId = true;
doc.InsertAt(0, new BsonElement(name, value));
}
else
{
doc.Add(name, value);
}
}
return doc;
}
