vlkb-obscore: fills in em_ from surveys::trans for 2D images

data-access/engine/src/vlkb-obscore/src/database/SqlSchema_INSERT.cpp

@@ -186,6 +186,59 @@ string get_wavelen(int precision, fitsfiles::key_values_by_type key_values)
 }
 
 
+// trim from start (in place)
+inline void ltrim(std::string &s) {
+    s.erase(s.begin(), std::find_if(s.begin(), s.end(), [](unsigned char ch) {
+        return !std::isspace(ch);
+    }));
+}
+
+// trim from end (in place)
+inline void rtrim(std::string &s) {
+    s.erase(std::find_if(s.rbegin(), s.rend(), [](unsigned char ch) {
+        return !std::isspace(ch);
+    }).base(), s.end());
+}
+
+// trim from both ends (in place)
+inline void trim(std::string &s) {
+    rtrim(s);
+    ltrim(s);
+}
+
+
+// returns band in wavelen [m]
+double parse_transition(string trans)
+{
+   // Surveys::survTransition "num unit" <-- for images
+
+   trim(trans);
+
+   if(!trans.empty())
+   {
+      string::size_type pos = trans.find(' ');
+      std::string num  = trans.substr(0, pos);
+      std::string unit = trans.substr(pos+1);
+
+      LOG_STREAM << "parse trans: " << num << " " << unit << endl;
+
+      const double speed_of_light = 299792458.0; // [m/s] in vacuum
+
+      double value = stod(num);
+      if(unit.compare("um") == 0) return value * 1e-6;
+      else if(unit.compare("mm") == 0) return value * 1e-3;
+      else if(unit.compare("m") == 0) return value;
+      else if(unit.compare("GHz") == 0) return (speed_of_light / (value * 1e9));
+      else if(unit.compare("MHz") == 0) return (speed_of_light / (value * 1e6));
+      else if(unit.compare("kHz") == 0) return (speed_of_light / (value * 1e3));
+      else if(unit.compare("Hz") == 0) return (speed_of_light / (value));
+      else
+         return 0.0; // ignore
+   }
+   else
+      return 0.0;
+}
+
 
 //----------------------------------------------------------------------
 // public API
@@ -374,10 +427,11 @@ void SqlSchema_INSERT::appendRow(/*const int hid, const int sid,*/
    }
    else if(icrsBounds.size() == 2) // 2D images
    {
-      //if(!strcmp(survey.survSpecies.c_str(), "Continuum"))
-      //   dem_min = dem_max = 0.0; // FIXME transtod(psurv->transition);
+      // surv.restFrequency [Hz] <-- is empty for 2D images: take from survTransition ?
+      // surv.survTransition "num unit" <-- for images
 
-      obscoreRow[em_min] = get_wavelen(EM_PRECISION, hdu.key_values);
+      double val = parse_transition(surv.survTransition);
+      obscoreRow[em_min] = ((val==0.0) ? "NULL" : to_string(val)); //get_wavelen(EM_PRECISION, hdu.key_values);
       obscoreRow[em_max] = obscoreRow[em_min];
       obscoreRow[em_res_power] = "NULL";
       obscoreRow[em_xel]       = "NULL";