/***************************************************************************
                     expatwrap.h  -  c++ wrapper for expat
                             -------------------
    begin                : Sun May 20 2007
    copyright            : (C) 2002-2007 by Ewald Arnold
    email                : ulxmlrpcpp@ewald-arnold.de

    $Id: expatwrap.cpp 966 2007-07-08 17:23:21Z ewald-arnold $

 ***************************************************************************/

/**************************************************************************
 *
 * This program 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 of the License,
 * or (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 ***************************************************************************/


#include "expatwrap.h"
#include "xmlexcept.h"


ExpatWrapper::ExpatWrapper(bool createParser)
  : XmlParserBase()
{
  if (createParser)
  {
    expatParser = ::XML_ParserCreate(0);
    setHandler();
  }
}


ExpatWrapper::~ExpatWrapper()
{
  if (expatParser)  // allows subclasses to avoid finishing parsing
    ::XML_ParserFree(expatParser);
}


void ExpatWrapper::setHandler()
{
  ::XML_SetUserData(expatParser, this);
  ::XML_SetElementHandler(expatParser, startElementCallback, endElementCallback);
  ::XML_SetCharacterDataHandler(expatParser, charDataCallback);
}


void ExpatWrapper::reset()
{
  ::XML_ParserReset(expatParser, 0);
  setHandler();
}


void ExpatWrapper::startElement(const XML_Char*, const XML_Char**)
{
}


void ExpatWrapper::endElement(const XML_Char*)
{
}


void ExpatWrapper::charData(const XML_Char*, int )
{
}


int ExpatWrapper::mapToFaultCode(int xpatcode) const
{
   int fc = NotWellformedError;
   // try to map error codes
   switch (xpatcode)
   {
     case XML_ERROR_UNKNOWN_ENCODING:
       fc = UnsupportedEncodingError;
     break;

     case XML_ERROR_BAD_CHAR_REF:
     case XML_ERROR_PARTIAL_CHAR:
     case XML_ERROR_INCORRECT_ENCODING: // fallthrough
       fc = InvalidCharacterError;
     break;

     default:
       fc = NotWellformedError;
   }
   return fc;
}



void ExpatWrapper::startElementCallback(void *userData,
                                     const XML_Char* name,
                                     const XML_Char** atts)
{
  ((ExpatWrapper*)userData)->startElement(name, atts);
}



void ExpatWrapper::endElementCallback(void *userData, const XML_Char* name)
{
   ((ExpatWrapper*)userData)->endElement(name);
}



void ExpatWrapper::charDataCallback(void *userData, const XML_Char* s, int len)
{
   ((ExpatWrapper*)userData)->charData(s, len);
}


int ExpatWrapper::parse(const char* buffer, int len, int isFinal)
{
  return ::XML_Parse(expatParser, buffer, len, isFinal);
}


unsigned  ExpatWrapper::getErrorCode() const
{
  return ::XML_GetErrorCode(expatParser);
}


std::string ExpatWrapper::getErrorString(unsigned code) const
{
  return XML_ErrorString((XML_Error) code);
}


int ExpatWrapper::getCurrentLineNumber() const
{
  return ::XML_GetCurrentLineNumber(expatParser);
}


///////////////////////////////////////////////


ExpatWrapper::AttributeList::AttributeList(ExpatWrapper *in_parser, const XML_Char** atts)
  : parser(in_parser)
{
  for (unsigned i = 0; atts[i]; i += 2)
  {
    const std::string name = atts[i];
    const std::string content = atts[i+1];

    if (hasAttribute(name))
      throw XmlException(NotWellformedError,
                         "Problem while parsing xml structure",
                         parser->getCurrentLineNumber(),
                         std::string("duplicate attribute: ") + name);

    attributes.insert(std::make_pair(name, content));
  }
}


bool ExpatWrapper::AttributeList::hasAttribute(const std::string &name) const
{
  return attributes.find(name) != attributes.end();
}


std::string ExpatWrapper::AttributeList::getAttribute(const std::string &name) const
{
  std::map<std::string, std::string>::const_iterator it = attributes.find(name);

  if (it == attributes.end())
    throw XmlException(NotWellformedError,
                       "Problem while parsing xml structure",
                       parser->getCurrentLineNumber(),
                       std::string("attribute not available: ") + name);

  return (*it).second;
}