commandline.h

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class NOVTABLE commandline_handler : public service_base
{
public:
    enum result
    {
        RESULT_NOT_OURS,//not our command
        RESULT_PROCESSED,//command processed
        RESULT_PROCESSED_EXPECT_FILES,//command processed, we want to takeover file urls after this command
    };
    virtual result on_token(const char * token)=0;
    virtual void on_file(const char * url) {};//optional
    virtual void on_files_done() {};//optional
    virtual bool want_directories() {return false;}

    FB2K_MAKE_SERVICE_INTERFACE_ENTRYPOINT(commandline_handler);
};

class commandline_handler_metadb_handle : public commandline_handler//helper 
{
protected:
    virtual void on_file(const char * url);
    virtual bool want_directories() {return true;}
public:
    virtual result on_token(const char * token)=0;  
    virtual void on_files_done() {};
    
    virtual void on_file(const metadb_handle_ptr & ptr)=0;
};

/*

how commandline_handler is used:

    scenario #1:
        creation => on_token() => deletion
    scenario #2:
        creation => on_token() returning RESULT_PROCESSED_EXPECT_FILES => on_file(), on_file().... => on_files_done() => deletion
*/

template<typename T>
class commandline_handler_factory_t : public service_factory_t<T> {};