AthAlgStartVisitor.cxx

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/*
  Copyright (C) 2002-2018 CERN for the benefit of the ATLAS collaboration
*/
/*
 */
// $Id$
 
 
#include "AthenaBaseComps/AthAlgStartVisitor.h"
#include "StoreGate/VarHandleKey.h"
#include "StoreGate/exceptions.h"
#include "GaudiKernel/IAlgorithm.h"

AthAlgStartVisitor::AthAlgStartVisitor(INamedInterface *n) {
  // only do recursive traversal if we are called from a real Algorithm
  IAlgorithm* ia = dynamic_cast<IAlgorithm*>(n);
  if ( ia == nullptr) {
    m_recursive = false;
  } else if ( ia->isSequence() ) {
    m_recursive = false;
    m_ignore = true;
  }
}
 

void AthAlgStartVisitor::visit (const IDataHandleHolder* holder)
{
  if (m_ignore) return;
 
  // Make sure we process a component only once.
  if (m_seen.insert (holder).second) {
 
    // Check all input handles are initialised
    for (Gaudi::DataHandle* h : holder->inputHandles()) {
 
      auto vhk = dynamic_cast<SG::VarHandleKey*> (h);
      if (!vhk) throw SG::ExcNullHandleKey();
 
      if (!vhk->storeHandle().get() && !vhk->key().empty()) {
        throw SG::ExcUninitKey (vhk->clid(), vhk->key(), vhk->storeHandle().name(), holder->name());
      }
 
      // Call start() on all read conditions handle keys.
      if (h->isCondition()) {
        vhk->start().ignore();
      }
    }
 
    // Check all output handles are initialised
    for (Gaudi::DataHandle* h : holder->outputHandles()) {
 
      auto vhk = dynamic_cast< SG::VarHandleKey* > (h);
      if (!vhk) throw SG::ExcNullHandleKey();
 
      if (!vhk->storeHandle().get() && !vhk->key().empty()) {
        throw SG::ExcUninitKey (vhk->clid(), vhk->key(), vhk->storeHandle().name(), holder->name());
      }
    }
 
    if (m_recursive) {
      holder->acceptDHVisitor (this);
    }
  }
}