Teuchos_XMLInputSource.cpp

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// @HEADER
// ***********************************************************************
// 
//                    Teuchos: Common Tools Package
//                 Copyright (2004) Sandia Corporation
// 
// Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive
// license for use of this work by or on behalf of the U.S. Government.
// 
// 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307
// USA
// Questions? Contact Michael A. Heroux (maherou@sandia.gov) 
// 
// ***********************************************************************
// @HEADER

#include "Teuchos_XMLInputSource.hpp"
#include "Teuchos_TreeBuildingXMLHandler.hpp"


#ifdef HAVE_XERCES
#include "XercesHandlerAdapter.h"
#include "XercesInputSourceAdapter.h"
#include "XercesInputStreamAdapter.h"
#include <util/PlatformUtils.hpp>
#endif

#ifdef HAVE_EXPAT
#include "Teuchos_ExpatHandlerAdapter.hpp"
#define EXPAT_BUFSIZE 8192
#endif


using namespace Teuchos;

XMLObject XMLInputSource::getObject() const
{
#ifdef HAVE_XERCES

  static bool first = true;
  if (first)
    {
      XMLPlatformUtils::Initialize();
      first = false;
    }

  SAXParser parser;
  XercesHandlerAdapter handler(new TreeBuildingXMLHandler());
  XercesInputSourceAdapter inputSource(this);

  parser.setDocumentHandler(&handler);

  try 
    {
      parser.parse(inputSource);
    }
  catch(exception& e)
    {
      TEST_FOR_EXCEPTION(true, runtime_error, 
                         "exception detected in SAX parsing: " << e.what());
    }
  return handler.getObject();
#endif

#ifdef HAVE_EXPAT

  RefCountPtr<TreeBuildingXMLHandler> handler = rcp(new TreeBuildingXMLHandler());

  XML_Parser parser = XML_ParserCreate(NULL);

  XML_SetElementHandler(parser, expatStartElementHandler, 
                        expatEndElementHandler);

  XML_SetCharacterDataHandler(parser, expatCharacterDataHandler);

  XML_SetUserData(parser, (void*) &(*handler));

  RefCountPtr<XMLInputStream> s = stream();

  bool done = false;
  unsigned int bufsize = EXPAT_BUFSIZE;
  unsigned char buf[EXPAT_BUFSIZE];

  while (!done)
    {
      unsigned int nRead = s->readBytes(buf, bufsize);
      if (nRead < bufsize) 
        {
          done = true;
        }
      XML_Parse(parser, (char*) buf, bufsize, done);
    }

  return handler->getObject();

#else
  TEST_FOR_EXCEPTION(true, logic_error, "XMLInputSource::getObject() - no XML parser installed");
  return XMLObject(); // -Wall
#endif

}
      
      

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