EventIterator.h

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/***********************************************************************************\
* (c) Copyright 1998-2025 CERN for the benefit of the LHCb and ATLAS collaborations *
*                                                                                   *
* This software is distributed under the terms of the Apache version 2 licence,     *
* copied verbatim in the file "LICENSE".                                            *
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* granted to it by virtue of its status as an Intergovernmental Organization        *
* or submit itself to any jurisdiction.                                             *
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#pragma once
 
#include <GaudiKernel/IDataStreamTool.h>
#include <GaudiKernel/IEvtSelector.h>
 
class EvtSelectorContext : public IEvtSelector::Context {
  // Friend declaration
  friend class EventSelector;
  friend class EventCollectionSelector;
 
private:
  EvtSelectorContext( const EvtSelectorContext& ) = default;
 
protected:
  IDataStreamTool::size_type m_streamID = -1;
  long m_count = -1;
  long m_strCount = -1;
  const IEvtSelector* m_pSelector = nullptr;
  IEvtSelector::Context* m_context = nullptr;
  IOpaqueAddress* m_pAddress = nullptr;
  void set( const IEvtSelector* sel, IDataStreamTool::size_type id, IEvtSelector::Context* it, IOpaqueAddress* pA ) {
    m_pSelector = sel;
    m_context   = it;
    m_streamID  = id;
    m_pAddress  = pA;
    m_strCount  = -1;
  }
  void set( IEvtSelector::Context* it, IOpaqueAddress* pA ) {
    m_context  = it;
    m_pAddress = pA;
  }
  void set( IOpaqueAddress* pA ) { m_pAddress = pA; }
  IEvtSelector::Context* context() const { return m_context; }
  IDataStreamTool::size_type increaseCounters( bool reset = false ) {
    m_count++;
    m_strCount = ( reset ) ? 0 : m_strCount + 1;
    return m_count;
  }
  IDataStreamTool::size_type decreaseCounters( bool reset = false ) {
    m_count++;
    m_strCount = ( reset ) ? 0 : m_strCount - 1;
    return m_count;
  }
 
public:
  EvtSelectorContext( const IEvtSelector* selector ) : m_pSelector( selector ) {}
 
  virtual IDataStreamTool::size_type ID() const { return m_streamID; }
  long numEvent() const { return m_count; }
  long  numStreamEvent() const { return m_strCount; }
  void* identifier() const override { return (void*)m_pSelector; }
};