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#ifndef IMAGE_IO_BASE_OSTREAM_REF_DATA_DESTINATION_H_ // NOLINT
#define IMAGE_IO_BASE_OSTREAM_REF_DATA_DESTINATION_H_ // NOLINT
#include <iostream>
#include <string>
#include "image_io/base/data_destination.h"
#include "image_io/base/message_handler.h"
namespace photos_editing_formats {
namespace image_io {
/// A DataDestination that writes its output to an ostream held as a reference.
class OStreamRefDataDestination : public DataDestination {
public:
/// Constructs an OStreamDataDestination using the given ostream.
/// @param ostream_ref The ostream to which data is written.
/// @param message_handler An option message handler for writing messages.
OStreamRefDataDestination(std::ostream& ostream_ref,
MessageHandler* message_handler)
: ostream_ref_(ostream_ref),
message_handler_(message_handler),
bytes_transferred_(0),
has_error_(false) {}
OStreamRefDataDestination(const OStreamRefDataDestination&) = delete;
OStreamRefDataDestination& operator=(const OStreamRefDataDestination&) =
delete;
/// @param name A name to associate with the ostream. Used for error messages.
void SetName(const std::string& name) { name_ = name; }
/// @return The name associated with the ostream.
const std::string& GetName() const { return name_; }
/// @return The number of bytes written to the ostream.
size_t GetBytesTransferred() const override { return bytes_transferred_; }
/// @return True if errors were encountered while writing to the ostream.
bool HasError() const { return has_error_; }
void StartTransfer() override;
TransferStatus Transfer(const DataRange& transfer_range,
const DataSegment& data_segment) override;
void FinishTransfer() override;
private:
/// The ostream written to.
std::ostream& ostream_ref_;
/// An optional message handler to write messages to.
MessageHandler* message_handler_;
/// The number of bytes written so far.
size_t bytes_transferred_;
/// A (file) name to associate with the ostream, used with error messages.
std::string name_;
/// If true indicates an error has occurred writing to the ostream.
bool has_error_;
};
} // namespace image_io
} // namespace photos_editing_formats
#endif // IMAGE_IO_BASE_OSTREAM_REF_DATA_DESTINATION_H_ // NOLINT
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