DEPICSvalue.h

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// $Id$
// $HeadURL$
//
//    File: DEPICSvalue.h
// Created: Tue Nov 11 21:40:17 EST 2014
// Creator: davidl (on Linux gluon104.jlab.org 2.6.32-358.23.2.el6.x86_64 x86_64)
//

#ifndef _DEPICSvalue_
#define _DEPICSvalue_

#include <string>
#include <time.h>
#include <stdint.h>
using std::string;

#include <JANA/jerror.h>
#include <JANA/JObject.h>

/// A DEPICSvalue object holds information for a single
/// EPICS value read from the data stream. Values are
/// stored in the data stream as strings of the form:
/// key=value. This string is available in the "nameval"
/// field. It is parsed however so that one may access the
/// name via "name" and the value as a sting via "sval".
/// The "ival", "uval", and "fval" hold the value converted
/// into a an "int", "uint32_t", and "double" respectively.
/// This is done using the stringstream class an is done
/// for convience. The EPICS values are inserted into the
/// EVIO file during data taking by the epics2et program
/// which should be started automatically by the DAQ system.
/// Source for that can be found here:
///
///  https://halldsvn.jlab.org/repos/trunk/online/packages/etUtils/src/epics2et


class DEPICSvalue:public jana::JObject{
   public:
      JOBJECT_PUBLIC(DEPICSvalue);
      DEPICSvalue(time_t timestamp, string &nameval){
         this->timestamp = timestamp;
         this->nameval = nameval;
         size_t pos = nameval.find("=");
         if(pos != nameval.npos){
            name = nameval.substr(0, pos);
            sval = nameval.substr(pos+1);
            
            stringstream ss(sval);
            ss >> ival;
            ss.str(sval);
            ss >> uval;
            ss.str(sval);
            ss >> fval;
            
            // stringstream will set fval to 0.0 if no decimal
            // point is in the string. Use ival in these cases
            if( (fval==0.0) && (ival!=0.0) ) fval = (double)ival;
         }
      }
      virtual ~DEPICSvalue(){}
      
      time_t   timestamp;
      string   nameval;
      string   name;
      string   sval;
      int      ival;
      uint32_t uval;
      double   fval;

      // This method is used primarily for pretty printing
      // the second argument to AddString is printf style format
      void toStrings(vector<pair<string,string> > &items)const{
         string timestr = ctime(&timestamp);
         timestr[timestr.length()-1] = 0;
         AddString(items, "timestamp", "%d", timestamp);
         AddString(items, "name", "%s", name.c_str());
         AddString(items, "sval", "%s", sval.substr(0, 255).c_str());
         AddString(items, "ival", "%d", ival);
         AddString(items, "fval", "%f", (float)fval);
         AddString(items, "t", "%s", timestr.c_str());
      }
};

#endif // _DEPICSvalue_