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IDybInputLoadTool.h

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#ifndef IDYBLOADTOOL
#define IDYBLOADTOOL

#include "GaudiKernel/IAlgTool.h"
#include "Event/HeaderObject.h"
#include "Event/RegistrationSequence.h" // for default location

#include <string>
#include <map>
#include <vector>


class IDybInputLoadTool : virtual public IAlgTool
{
public:
    // This is much like a RegistrationSequence except it is not aware of
    // any event stores.  It does NO reference counting on the held
    // HeaderObjects.
    typedef std::pair<std::string,DayaBay::HeaderObject*> ExecutionFrameEntry;
    typedef std::vector<ExecutionFrameEntry> ExecutionFrame;


    static const InterfaceID& interfaceID();

    // This will return the HeaderObject at the given entry and path
    // in some input file or NULL on failure.  If input_headers is
    // true it will recursively call itself in order to populate the
    // InputHeaders hierarchy.  If fileNumber is not -1, interpret
    // entry as a file entry and use fileNumber to pick the right file
    // in the intput stream.

    // No attempt will be made to reuse the same HeaderObject if it
    // happens to be in more than one inputHeaders list.  The caller
    // can resolve duplicates by looking at the HeaderObject's
    // execNumber.

    virtual DayaBay::HeaderObject* 
    get_header(int entry, const std::string& path, 
               bool input_headers = true, int fileNumber = -1) = 0;


    // This will return an ExecutionFrame based on the
    // PerRegistrationSequence found at the given entry and path or
    // empty vector on failure.  If input_headers is true it behaves
    // like get_header(), otherwise, inputHeaders will only be
    // populated with HeadersObjects found in the immediate frame.

    virtual ExecutionFrame
    get_frame(int entry, const std::string& path = 
              DayaBay::RegistrationSequenceLocation::Default,
              bool input_headers = true) = 0;

    // Return the number of entries in a certain location
    // -1 in case path not found
    virtual int
    get_entries(const std::string& path) = 0;

protected:

    virtual ~IDybInputLoadTool();

};

#endif  // IDYBLOADTOOL

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