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CGDBMException.h

// Author:
//   Jason Venema
//   NSCL
//   Michigan State University
//   East Lansing, MI 48824-1321
//   mailto: venemaja@msu.edu
//
// Copyright
//   NSCL All rights reserved.
//
// A CGDBMException is thrown whenever an exception occurs while using the
// UNIX database system gdbm. Examples include a failed file open, a failed
// entry store, a failed entry fetch, etc.
//

#ifndef __CGDBMEXCEPTION_H  //Required for current class
#define __CGDBMEXCEPTION_H
                               //Required for base classes
#ifndef __CEXCEPTION_H
#include "CException.h"
#endif

#ifndef __HISTOTYPES_H
#include <histotypes.h>
#endif

#ifndef __GDBM_H
#include <gdbm.h>
#endif

#ifndef __STL_STRING
#include <string>
#define __STL_STRING
#endif

class CGDBMException : public CException
{
  gdbm_error m_nError;      // Snapshot of gdbm_errno at construction time

 public:
  // Default constructors
  CGDBMException(const char* pszAction, gdbm_error am_nError) :
    m_nError(am_nError),
    CException(pszAction) {}
  CGDBMException(const std::string& rsAction, gdbm_error am_nError) :
    m_nError(am_nError),
    CException(rsAction) {}

  // Destructor
  ~CGDBMException() {}

  // Copy constructor
  CGDBMException(const CGDBMException& aCGDBMException) :
    CException(aCGDBMException)
    {
      m_nError = aCGDBMException.m_nError;
    }

  // Ooperator= Assignment operator
  CGDBMException& operator= (const CGDBMException& aCGDBMException)
    {
      if(this == &aCGDBMException) return *this;
      CException::operator= (aCGDBMException);
      m_nError = aCGDBMException.m_nError;
      return *this;
    }

  // Operator== Equality operator
  int operator== (const CGDBMException& aCGDBMException)
    {
      return ((CException::operator== (aCGDBMException)) &&
              (m_nError == aCGDBMException.m_nError));
    }

  // Public selector functions
  gdbm_error getError() const { return m_nError; }

  // Protected mutator function
 protected:
  void setError(gdbm_error am_nError) { m_nError = am_nError; }

  // Public member functions
  virtual const char* ReasonText() const;
  virtual Int_t ReasonCode() const;
};

#endif

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