ITypeDescriptor MergeDescriptor(ITypeDescriptor origDesc)
{
var visited = new HashSet<ITypeDescriptor>(ReferenceEqualityComparer<ITypeDescriptor>.Instance);
var hasCycle = false;
Func<ITypeDescriptor, ITypeDescriptor> old2New = null;
old2New = old =>
{
if (visited.Contains(old))
{
hasCycle = true;
return new PlaceHolderDescriptor(old);
}
visited.Add(origDesc);
SerializerTypeInfo info;
if (_typeOrDescriptor2Info.TryGetValue(old, out info))
{
return info.Descriptor;
}
if (old is ObjectTypeDescriptor || old is EnumTypeDescriptor)
{
var type = TypeNameMapper.ToType(old.Name) ?? typeof(object);
if (type != typeof(object))
{
return Create(type);
}
}
return old.CloneAndMapNestedTypes(this, old2New);
};
var res = old2New(origDesc);
if (hasCycle)
{
visited.Clear();
visited.Add(res);
Func<ITypeDescriptor, ITypeDescriptor> deplaceholder = null;
deplaceholder = old =>
{
if (old is PlaceHolderDescriptor)
{
return ((PlaceHolderDescriptor) old).TypeDesc;
}
if (visited.Contains(old)) return old;
visited.Add(old);
old.MapNestedTypes(deplaceholder);
return old;
};
res.MapNestedTypes(deplaceholder);
}
foreach (var existingTypeDescriptor in _typeOrDescriptor2Info)
{
if (res.Equals(existingTypeDescriptor.Value.Descriptor))
{
return existingTypeDescriptor.Value.Descriptor;
}
}
foreach (var existingTypeDescriptor in _typeOrDescriptor2InfoNew)
{
if (res.Equals(existingTypeDescriptor.Value.Descriptor))
{
return existingTypeDescriptor.Value.Descriptor;
}
}
return res;
}
