/// <summary>
/// Deserialize object.
/// </summary>
/// <returns>Deserialized object.</returns>
public T Deserialize <T>()
{
int pos = Stream.Position;
byte hdr = Stream.ReadByte();
var doDetach = _detach; // save detach flag into a var and reset so it does not go deeper
_detach = false;
switch (hdr)
{
case PortableUtils.HdrNull:
return(default(T));
case PortableUtils.HdrHnd:
return(ReadHandleObject <T>(pos));
case PortableUtils.HdrFull:
return(ReadFullObject <T>(pos));
case PortableUtils.TypePortable:
return(ReadPortableObject <T>(doDetach));
}
if (PortableUtils.IsPredefinedType(hdr))
{
return(PortableSystemHandlers.ReadSystemType <T>(hdr, this));
}
throw new PortableException("Invalid header on deserialization [pos=" + pos + ", hdr=" + hdr + ']');
}
internal void Write <T>(T obj, object handler)
{
// Apply detach mode if needed.
PortableHandleDictionary <object, long> oldHnds = null;
bool resetDetach = false;
if (_detach)
{
_detach = false;
_detachMode = true;
resetDetach = true;
oldHnds = _hnds;
_hnds = null;
}
try
{
// Write null.
if (obj == null)
{
_stream.WriteByte(PortableUtils.HdrNull);
return;
}
if (_builder != null)
{
// Special case for portable object during build.
PortableUserObject portObj = obj as PortableUserObject;
if (portObj != null)
{
if (!WriteHandle(_stream.Position, portObj))
{
_builder.ProcessPortable(_stream, portObj);
}
return;
}
// Special case for builder during build.
PortableBuilderImpl portBuilder = obj as PortableBuilderImpl;
if (portBuilder != null)
{
if (!WriteHandle(_stream.Position, portBuilder))
{
_builder.ProcessBuilder(_stream, portBuilder);
}
return;
}
}
// Try writting as well-known type.
if (InvokeHandler(handler, handler as PortableSystemWriteDelegate, obj))
{
return;
}
Type type = obj.GetType();
IPortableTypeDescriptor desc = _marsh.Descriptor(type);
object typedHandler;
PortableSystemWriteDelegate untypedHandler;
if (desc == null)
{
typedHandler = null;
untypedHandler = PortableSystemHandlers.WriteHandler(type);
}
else
{
typedHandler = desc.TypedHandler;
untypedHandler = desc.UntypedHandler;
}
if (InvokeHandler(typedHandler, untypedHandler, obj))
{
return;
}
if (desc == null)
{
if (!type.IsSerializable)
{
// If neither handler, nor descriptor exist, and not serializable, this is an exception.
throw new PortableException("Unsupported object type [type=" + type +
", object=" + obj + ']');
}
Write(new SerializableObjectHolder(obj));
return;
}
int pos = _stream.Position;
// Dealing with handles.
if (!(desc.Serializer is IPortableSystemTypeSerializer) && WriteHandle(pos, obj))
{
return;
}
// Write header.
_stream.WriteByte(PortableUtils.HdrFull);
_stream.WriteBool(desc.UserType);
_stream.WriteInt(desc.TypeId);
_stream.WriteInt(obj.GetHashCode());
// Skip length as it is not known in the first place.
_stream.Seek(8, SeekOrigin.Current);
// Preserve old frame.
int oldTypeId = _curTypeId;
IPortableNameMapper oldConverter = _curConverter;
IPortableIdMapper oldMapper = _curMapper;
IPortableMetadataHandler oldMetaHnd = _curMetaHnd;
bool oldRaw = _curRaw;
long oldRawPos = _curRawPos;
// Push new frame.
_curTypeId = desc.TypeId;
_curConverter = desc.NameConverter;
_curMapper = desc.Mapper;
_curMetaHnd = desc.MetadataEnabled ? _marsh.MetadataHandler(desc) : null;
_curRaw = false;
_curRawPos = 0;
// Write object fields.
desc.Serializer.WritePortable(obj, this);
// Calculate and write length.
int retPos = _stream.Position;
_stream.Seek(pos + 10, SeekOrigin.Begin);
int len = retPos - pos;
_stream.WriteInt(len);
if (_curRawPos != 0)
{
// When set, it is difference between object head and raw position.
_stream.WriteInt((int)(_curRawPos - pos));
}
else
{
// When no set, it is equal to object length.
_stream.WriteInt(len);
}
_stream.Seek(retPos, SeekOrigin.Begin);
// 13. Collect metadata.
if (_curMetaHnd != null)
{
IDictionary <string, int> meta = _curMetaHnd.OnObjectWriteFinished();
if (meta != null)
{
SaveMetadata(_curTypeId, desc.TypeName, desc.AffinityKeyFieldName, meta);
}
}
// Restore old frame.
_curTypeId = oldTypeId;
_curConverter = oldConverter;
_curMapper = oldMapper;
_curMetaHnd = oldMetaHnd;
_curRaw = oldRaw;
_curRawPos = oldRawPos;
}
finally
{
// Restore handles if needed.
if (resetDetach)
{
// Add newly recorded handles without overriding already existing ones.
if (_hnds != null)
{
if (oldHnds == null)
{
oldHnds = _hnds;
}
else
{
oldHnds.Merge(_hnds);
}
}
_hnds = oldHnds;
_detachMode = false;
}
}
}
