SaxParserWrapper.h

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// This file is part of the "NcML Module" project, a BES module designed
// to allow NcML files to be used to be used as a wrapper to add
// AIS to existing datasets of any format.
//
// Copyright (c) 2009 OPeNDAP, Inc.
// Author: Michael Johnson  <m.johnson@opendap.org>
//
// For more information, please also see the main website: http://opendap.org/
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
//
// Please see the files COPYING and COPYRIGHT for more information on the GLPL.
//
// You can contact OPeNDAP, Inc. at PO Box 112, Saunderstown, RI. 02874-0112.

#ifndef __NCML_MODULE__SAX_PARSER_WRAPPER_H__
#define __NCML_MODULE__SAX_PARSER_WRAPPER_H__

#include <string>
#include <libxml/parserInternals.h>
#include "BESError.h"

using namespace std;

namespace ncml_module
{
  class SaxParser;
}

namespace ncml_module
{
class SaxParserWrapper
{
private: // Inner Classes

  enum ParserState { NOT_PARSING=0, PARSING, EXCEPTION, NUM_STATES};

private: // Data Rep

  SaxParser& _parser;

  xmlSAXHandler _handler;

  xmlParserCtxtPtr _context;

  ParserState _state;

  string _errorMsg;
  int _errorType;
  string _errorFile;
  int _errorLine;

private:
  SaxParserWrapper(const SaxParserWrapper&); // illegal
  SaxParserWrapper& operator=(const SaxParserWrapper&); // illegal

public:
  SaxParserWrapper(SaxParser& parser);
  virtual ~SaxParserWrapper();

  bool parse(const string& ncmlFilename);

  SaxParser& getParser() const { return _parser; }


  void deferException(BESError& theErr);

  bool isExceptionState() const { return _state == EXCEPTION; }

  void rethrowException();

  int getCurrentParseLine() const;

private:

  void setupParser(const string& filename);

  void cleanupParser() throw ();

}; // class SaxParserWrapper

} // namespace ncml_module

#endif /*__NCML_MODULE__SAX_PARSER_WRAPPER_H__ */