/*
 * Copyright 2023, Andrew Lindesay <apl@lindesay.co.nz>.
 * All rights reserved. Distributed under the terms of the MIT License.
 */
#ifndef CHECKSUM_JSON_EVENT_LISTENER_H
#define CHECKSUM_JSON_EVENT_LISTENER_H


#include <JsonEventListener.h>


/*!     This class can be used by a text to accept JSON events and then to maintain a checksum of the
        strings and numbers that it encounters in order to get some sort of a checksum on the data
        that it is seeing. It can then compare this to the data that was emitted in order to verify
        that the JSON parser has parsed and passed-through all of the data correctly.
*/

class ChecksumJsonEventListener : public BJsonEventListener {
public:
                                                                ChecksumJsonEventListener(int32 checksumLimit);
        virtual                                         ~ChecksumJsonEventListener();

        virtual bool                            Handle(const BJsonEvent& event);
        virtual void                            HandleError(status_t status, int32 line, const char* message);
        virtual void                            Complete();

                        uint32                          Checksum() const;
                        status_t                        Error() const;

private:
                        void                            _ChecksumProcessCharacters(const char* content, size_t len);

private:
                        uint32                          fChecksum;
                        uint32                          fChecksumLimit;
                        status_t                        fError;
                        bool                            fCompleted;
};

#endif // CHECKSUM_JSON_EVENT_LISTENER_H