#ifndef _io_VEventFile_h_
#define _io_VEventFile_h_

#include <utl/AugerException.h>
#include <io/IoCodes.h>
#include <string>


namespace evt {
  class Event;
}


namespace io {

  /**  Base class for EventFile

    \author Stefano Argiro`
    \date 1 April 2003
    \version $Id: VEventFile.h 14717 2009-09-17 20:24:36Z lukas $
    \ingroup offline_io
  */

  class VEventFile {

  public:
    VEventFile();
    VEventFile(const std::string& filename, const Mode mode);  
    virtual ~VEventFile() { }

    // log error, throw excpt
    virtual void Open(const std::string& filename, const Mode mode = eRead) = 0;

    virtual void Close() = 0;

    virtual void Write(const evt::Event& event) = 0;

    /// read current event advance cursor by 1
    virtual Status Read(evt::Event& event) = 0;

    /// seek Event id set cursor there
    virtual Status FindEvent(const unsigned int eventId) = 0;

    /// goto by position in the file
    virtual Status GotoPosition(const unsigned int position) = 0;

    virtual int GetNEvents() = 0;

    const std::string& GetFilename() const { return fFilename; }

  protected:
    /// Copy constructor - not implemented
    VEventFile(const VEventFile& event);
    /// Assignment operator - not implemented
    VEventFile& operator=(const VEventFile& event);

    /** Checks that we are open for write
     * Intended to be called in the Write method
     * of derived classes */
    int DefaultWrite(evt::Event& event);

    /** Checks that file exists
     * Intended to be called in the Write method
     * of derived classes */
    int DefaultOpen(const std::string& filename, const Mode mode = eRead);

    std::string fFilename;
    Mode fMode;

  };

}


#endif

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