Add function CreateGeometry() to StarGeometry library

The code from StarDb/AgMLGeometry/CreateGeometry.h is copied to

StarVMC/StarGeometry/CreateGeometry.cxx
StarVMC/StarGeometry/CreateGeometry.h

StarVMC/StarGeometry/CreateGeometry.cxx

@@ -0,0 +1,75 @@
+#include <TGeoManager.h>
+
+#include "StBFChain/StBFChain.h"
+#include "StarVMC/StarAgmlLib/AgModule.h"
+#include "StarVMC/StarAgmlLib/StarTGeoStacker.h"
+#include "StarVMC/StarGeometry/StarGeo.h"
+
+extern StBFChain* chain;
+
+/**
+ * Adapted from StarDb/VmcGeometry/CreateGeometry.h
+ */
+TDataSet *CreateGeometry(const Char_t *name="y2011") {
+  TObjectSet *geom = 0;
+  if ( gGeoManager ) { 
+    cout << "AgML geometry:  Existing TGeoManager " << gGeoManager->GetName() 
+	 << " detected, ignoring request for " 
+	 << name << endl;
+    return geom;
+  }
+
+  // Cache geometry to a TFile.  Geometry will be restored from TFile on subsequent calls.
+  TString filename = "";  
+  if  (chain)  { filename = chain->GetFileOut(); if ( filename=="" ) filename = chain->GetFileIn();  }
+  else { filename = name;  }
+
+  // Strip out @ symbol
+  filename = filename.ReplaceAll("@",""); 
+  // Strip off the last extention in the filename
+  filename = filename( 0, filename.Last('.') );
+  // Append geom.root to the extentionless filename
+  filename+=".geom.root";
+
+  // Detect second call to the system
+  if ( AgModule::Find("HALL") ) {
+    if ( chain->GetOption("Sti")    ||
+	 chain->GetOption("StiCA")  ||
+	 chain->GetOption("StiVMC") ){
+      cout << "AgML geometry:  HALL exists.  Restore from cache file " 
+	   << filename.Data() << endl;
+      gGeoManager = 0;
+      assert(0);
+      TGeoManager::Import( filename );
+      assert(gGeoManager);
+    }
+    return geom;
+  }
+
+  cout << "AgML: Building geometry " << name << " " << endl;
+
+  // Create the geometry using TGeo
+  AgBlock::SetStacker( new StarTGeoStacker() ); 
+
+  Geometry *build = new Geometry();  
+
+  // Suppress copious ROOT warnings 
+  Long_t save = gErrorIgnoreLevel; gErrorIgnoreLevel = 9999;
+  build->ConstructGeometry(name);
+  gErrorIgnoreLevel = save;
+
+  if ( gGeoManager ) 
+    {
+      gGeoManager->CloseGeometry();
+      geom = new TObjectSet("Geometry",gGeoManager, false );
+      geom -> SetTitle( Form("AgML Geometry: %s",name) );
+
+      TFile *file = new TFile( filename, "recreate" );
+      file->cd();
+      gGeoManager->Write();
+      file->Close();
+      delete file;
+    }
+
+  return (TDataSet *)geom;  
+}

StarVMC/StarGeometry/CreateGeometry.h

@@ -0,0 +1,3 @@
+class TDataSet;
+
+TDataSet *CreateGeometry(const char *name="y2011");