code_device/sdk/sane_opt_json/base_opt.h

#pragma once

// SANE-Option
//
// created on 2022-10-24
//

#include <string>
#include <map>
#include <hginclude/utils.h>	// for refer
#include "../../../sdk/include/sane/sane_ex.h"

class sane_opt_provider : public refer
{
	bool	is_in_another_module_;

	std::string	opt_jsn_txt_;
	std::string where_;

protected:
	std::map<std::string, sane_opt_provider*>	following_;

public:
	sane_opt_provider();

protected:
	virtual ~sane_opt_provider();

	bool set_opt_json_text(char* txt);
	void set_where(const char* where);

public:
	const char* get_opt_json(void);	// if no content, return "" plz.
	const char* from(void);			// if no content, return "" plz.
	bool is_in_another_module(void) { return is_in_another_module_; }
	void set_following_provider(const char* name, sane_opt_provider* following);	// when option has provided by more than one
	sane_opt_provider* get_following(const char* name);								// caller should ->release returned value

public:
	// return malloc(), real data size stored in parameter 'size'. invoker should free() the returned value
	virtual char* get_value(const char* name, void* value, size_t* size, int* err = nullptr);
	virtual int set_value(const char* name, void* val);
	virtual void enable(const char* name, bool able);
};