AttachmentFetchEvent.hpp

#ifndef _DITTO_ATTACHMENT_FETCH_EVENT_
#define _DITTO_ATTACHMENT_FETCH_EVENT_
 
#include "Attachment.hpp"
 
namespace ditto {
enum class AttachmentFetchEventType {
  Completed,
  Progress,
  Deleted,
};

struct AttachmentFetchEvent {
  friend struct AttachmentFetchEventCompleted;
  friend struct AttachmentFetchEventProgress;
  friend struct AttachmentFetchEventDeleted;

  AttachmentFetchEventType type;
 
public: // Public virtual destructor to allow unique_ptr upcasting.
  virtual ~AttachmentFetchEvent() = default;
 
private:
  explicit AttachmentFetchEvent(AttachmentFetchEventType type);
};

struct AttachmentFetchEventCompleted : AttachmentFetchEvent {
  friend class AttachmentFetcher;

  Attachment attachment;
 
private:
  explicit AttachmentFetchEventCompleted(Attachment attachment);
};

struct AttachmentFetchEventProgress : AttachmentFetchEvent {
  friend class AttachmentFetcher;

  uint64_t downloaded_bytes;

  uint64_t total_bytes;
 
private:
  AttachmentFetchEventProgress(uint64_t downloaded_bytes, uint64_t total_bytes);
};

struct AttachmentFetchEventDeleted : AttachmentFetchEvent {
  friend class AttachmentFetcher;
 
private:
  explicit AttachmentFetchEventDeleted(); // NOLINT(modernize-use-equals-delete)
};
 
} // namespace ditto
#endif