KeyedObject.cpp

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// Include files
#include "GaudiKernel/Kernel.h"
#include "GaudiKernel/IRegistry.h"
#include "GaudiKernel/LinkManager.h"
#include "GaudiKernel/GaudiException.h"
#include "GaudiKernel/IDataProviderSvc.h"
#include "GaudiKernel/ObjectContainerBase.h"
#include "GaudiKernel/ContainedObject.h"

namespace Objects    {
  bool access(const ContainedObject* from, ContainedObject** to);
  bool access(const DataObject* from, DataObject** to);

  template <class TO, class FROM>
  TO* reference(FROM* from)    {
    ContainedObject* to = nullptr;
    return  access(from, &to) ? dynamic_cast<TO*>(to) : nullptr;
  }
}

bool Objects::access(const DataObject* from, DataObject** to)
{
  DataObject* src  = const_cast<DataObject*>(from);
  DataObject* tar = nullptr;
  if ( src ) {
    LinkManager* mgr = src->linkMgr();
    if ( mgr ) {
      LinkManager::Link* link = mgr->link(long(0));
      if ( link ) {
        tar = link->object();
        if ( !tar ) {
          IRegistry* reg = src->registry();
          if ( reg ) {
            IDataProviderSvc* ds = reg->dataSvc();
            if ( ds && ds->retrieveObject(link->path(), tar).isSuccess() ) {
              link->setObject(tar);
            }
          }
        }
      }
    }
  }
  *to = tar;
  return tar != nullptr;
}

// Load on demand: ContainedObject type references
bool Objects::access(const ContainedObject* from, ContainedObject** to)
{
  *to = nullptr;
  if ( from ) {
    DataObject *tar = nullptr;
    if ( access(from->parent(), &tar) ) {
      ObjectContainerBase* cnt = dynamic_cast<ObjectContainerBase*>(tar);
      if ( cnt ) {
        *to = cnt->containedObject(from->index());
      }
    }
  }
  return *to != nullptr;
}