StFmsDbConfig.h

/**************************************************************************
 * $Id: StFmsDbConfig.h,v 1.1 2015/03/10 14:38:54 jeromel Exp $
 * $Author: jeromel $
 **************************************************************************
 *
 * Description: This helper class faciliates the maintenance work and access 
 *              to FMS reconstruction-related parameters fmsRec
 *
 **************************************************************************
 *
 * $Log: StFmsDbConfig.h,v $
 * Revision 1.1  2015/03/10 14:38:54  jeromel
 * First version of FmsUtil from Yuxi Pan - reviewd 2015/02
 *
 *
 **************************************************************************/


#ifndef STFMSDBCONFIG_H
#define STFMSDBCONFIG_H
#include "StMessMgr.h"
#include "Stypes.h"
#include "TObject.h"
#include <map>
#include <cstdlib>
#include <string>
#include "tables/St_fmsRec_Table.h"
#include <iostream>
#include <sstream>
class StFmsDbConfig {

public:

        /* create singleton the first time it is used */
        inline static StFmsDbConfig& Instance() {
                static StFmsDbConfig theConfig;
                return theConfig;
        }

        /* fill internal map from text file*/
        Int_t fillMap(const char*);
        
        /* fill fmsRec_st structure with internal map*/
        Int_t fillFmsRec(fmsRec_st&);
        
        /* read database table fmsRe_st* into internal map*/
        Int_t readMap(const fmsRec_st&);
        
        /* write internal map to text file*/
        Int_t writeMap(const char*);
        
        Bool_t isMapEmpty();
        
        Bool_t keyExist(std::string);   

        /* do not invoke conversion if user asked for std::string, can be used with macros */
        const std::string& getParameter(std::string);

        /* do not invoke conversion if user is setting parameters with std::string */
        void setParameter(std::string, std::string);
 
        /* retrieve specific parameter by name, only works with compiled code 
           the user code need to make sure key exists in map (using keyExist()) */
        template<class T> 
        T getParameter(std::string param){
                
                const std::string& val = getParameter(param);

                T value;
                std::istringstream buffer(val);
                buffer >> value;

                return value;
        }
        
        template<class T> 
        void setParameter(std::string param, T value){
                std::ostringstream buffer;
                buffer << value;
                mRecPar[param] = buffer.str();

        }
        

private:

         StFmsDbConfig(){};                             //hide constructor and destructor
        ~StFmsDbConfig(){};
        StFmsDbConfig(const StFmsDbConfig&);
        StFmsDbConfig& operator=(const StFmsDbConfig&);

        std::map<std::string, std::string> mRecPar;     //name to value mapping
        
        ClassDef(StFmsDbConfig,1)

};

#endif