Add Magnetic Field geometry readers from DB payload.

Configuration/Geometry/python/MagneticFieldGeometryDB_cff.py

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+import FWCore.ParameterSet.Config as cms
+
+#
+# Magnetic Field Geometry master configuration
+#
+from GeometryReaders.XMLIdealGeometryESSource.cmsMagneticFieldGeometryDB_cff import *

GeometryReaders/XMLIdealGeometryESSource/python/cmsMagneticFieldGeometryDB_cff.py

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+import FWCore.ParameterSet.Config as cms
+
+XMLFromDBSource = cms.ESProducer("XMLIdealMagneticFieldGeometryESProducer",
+                                 rootDDName = cms.string('cmsMagneticField:MAGF'),
+                                 label = cms.string('magfield')
+                                 )

GeometryReaders/XMLIdealGeometryESSource/src/XMLIdealMagneticFieldGeometryESProducer.cc

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+#include "boost/shared_ptr.hpp"
+
+#include "FWCore/Framework/interface/ModuleFactory.h"
+#include "FWCore/Framework/interface/ESProducer.h"
+
+#include "FWCore/Framework/interface/ESHandle.h"
+#include "FWCore/Framework/interface/ESTransientHandle.h"
+
+#include "DetectorDescription/Core/interface/DDCompactView.h"
+#include "DetectorDescription/Core/interface/DDRoot.h"
+#include "DetectorDescription/Parser/interface/DDLParser.h"
+#include "CondFormats/Common/interface/FileBlob.h"
+#include "Geometry/Records/interface/GeometryFileRcd.h"
+#include "MagneticField/Records/interface/IdealMagneticFieldRecord.h"
+
+#include "DetectorDescription/Core/interface/DDMaterial.h"
+#include "DetectorDescription/Core/interface/DDSolid.h"
+#include "DetectorDescription/Core/interface/DDSpecifics.h"
+#include "DetectorDescription/Base/interface/DDRotationMatrix.h"
+
+#include "DetectorDescription/Core/src/Material.h"
+#include "DetectorDescription/Core/src/Solid.h"
+#include "DetectorDescription/Core/src/LogicalPart.h"
+#include "DetectorDescription/Core/src/Specific.h"
+
+class XMLIdealMagneticFieldGeometryESProducer : public edm::ESProducer
+{
+public:
+  XMLIdealMagneticFieldGeometryESProducer( const edm::ParameterSet& );
+  ~XMLIdealMagneticFieldGeometryESProducer();
+
+  typedef std::auto_ptr<DDCompactView> ReturnType;
+
+  ReturnType produce( const IdealMagneticFieldRecord& );
+
+private:
+  std::string rootDDName_; // this must be the form namespace:name
+  std::string label_;
+
+  DDI::Store<DDName, DDI::Material*> matStore_;
+  DDI::Store<DDName, DDI::Solid*> solidStore_;
+  DDI::Store<DDName, DDI::LogicalPart*> lpStore_;
+  DDI::Store<DDName, DDI::Specific*> specStore_;
+  DDI::Store<DDName, DDRotationMatrix*> rotStore_;    
+};
+
+XMLIdealMagneticFieldGeometryESProducer::XMLIdealMagneticFieldGeometryESProducer( const edm::ParameterSet& iConfig )
+  :   rootDDName_(iConfig.getParameter<std::string>( "rootDDName" )),
+      label_(iConfig.getParameter<std::string>( "label" ))
+{
+  setWhatProduced( this );
+}
+
+
+XMLIdealMagneticFieldGeometryESProducer::~XMLIdealMagneticFieldGeometryESProducer( void )
+{}
+
+XMLIdealMagneticFieldGeometryESProducer::ReturnType
+XMLIdealMagneticFieldGeometryESProducer::produce( const IdealMagneticFieldRecord& iRecord )
+{
+  using namespace edm::es;
+
+  edm::ESTransientHandle<FileBlob> gdd;
+  iRecord.getRecord<GeometryFileRcd>().get( label_, gdd );
+
+  DDName ddName(rootDDName_);
+  DDLogicalPart rootNode(ddName);
+  DDRootDef::instance().set(rootNode);
+  ReturnType returnValue(new DDCompactView(rootNode));
+  DDLParser parser(*returnValue);
+  parser.getDDLSAX2FileHandler()->setUserNS(true);
+  parser.clearFiles();
+
+  std::vector<unsigned char>* tb = (*gdd).getUncompressedBlob();
+
+  parser.parse(*tb, tb->size()); 
+
+  delete tb;
+
+  returnValue->lockdown();
+
+  return returnValue ;
+}
+
+DEFINE_FWK_EVENTSETUP_MODULE( XMLIdealMagneticFieldGeometryESProducer );