public static IWallAttachmentModel Create(Attachment attachment)
{
if (PhotoModel.IsPhoto(attachment))
{
return(new PhotoModel(attachment));
}
else
{
if (DocumentModel.IsDocument(attachment))
{
var document = new DocumentModel(attachment);
if (document.Uri == null)
{
return(null);
}
else
{
return(document);
}
}
else
{
if (LinkModel.IsLink(attachment))
{
return(new LinkModel(attachment));
}
else
{
throw new WrongAttachmentTypeException("no type matched");
return(null);
}
}
}
return(null);
}
public static bool IsModel(Attachment attachment)
{
return(PhotoModel.IsPhoto(attachment) || DocumentModel.IsDocument(attachment) || LinkModel.IsLink(attachment));
}