IsisXMLHandler.cpp

 
/* SPDX-License-Identifier: CC0-1.0 */
 
#include <string>
 
#include <xercesc/sax2/SAX2XMLReader.hpp>
#include <xercesc/util/XMLException.hpp>
 
#include <sstream>
 
#include "IException.h"
 
#include "IString.h"
 
#include "IsisXMLHandler.h"
#include "IsisXMLChTrans.h"
 
using namespace std;
 
namespace XERCES = XERCES_CPP_NAMESPACE;
 
 
// Constructors
 
IsisXMLHandler::IsisXMLHandler() {
  value = NULL;
  outputEndTag = 0;
}
 
 
IsisXMLHandler::IsisXMLHandler(char *PencodingName,
                               bool &PexpandNamespaces,
                               XERCES::SAX2XMLReader* &Pparser,
                               QString *Pvalue) {
 
  encodingName = PencodingName;
  expandNamespaces = PexpandNamespaces;
  parser = Pparser;
  value = Pvalue;
 
  outputEndTag = 0;
 
  prevDocHandler = parser->getContentHandler();
  prevErrorHandler = parser->getErrorHandler();
 
  parser->setContentHandler(this);
  parser->setErrorHandler(this);
}
 
 
IsisXMLHandler::IsisXMLHandler(char *PencodingName,
                               bool &PexpandNamespaces,
                               XERCES::SAX2XMLReader* &Pparser) {
 
  value = NULL;
  outputEndTag = 0;
 
  encodingName = PencodingName;
  expandNamespaces = PexpandNamespaces;
  parser = Pparser;
 
  prevDocHandler = parser->getContentHandler();
  prevErrorHandler = parser->getErrorHandler();
 
  parser->setContentHandler(this);
  parser->setErrorHandler(this);
}
 
 
IsisXMLHandler::~IsisXMLHandler() {}
 
 
//  IsisXMLHandler: Overrides the SAX ErrorHandler
void IsisXMLHandler::error(const XERCES::SAXParseException &e) {
  ostringstream os;
  os << "Error in application XML file line: " << e.getLineNumber()
     << " char: " << e.getColumnNumber() << ". "
     << XERCES::XMLString::transcode(e.getMessage());
  throw Isis::IException(Isis::IException::Programmer, os.str(), _FILEINFO_);
}
 
void IsisXMLHandler::fatalError(const XERCES::SAXParseException &e) {
  ostringstream os;
  os << "Error in application XML file line: " << e.getLineNumber()
     << " char: " << e.getColumnNumber() << ". "
     << XERCES::XMLString::transcode(e.getMessage());
  throw Isis::IException(Isis::IException::Programmer, os.str(), _FILEINFO_);
}
 
void IsisXMLHandler::warning(const XERCES::SAXParseException &e) {
  ostringstream os;
  os << "Error in application XML file line: " << e.getLineNumber()
     << " char: " << e.getColumnNumber() << ". "
     << XERCES::XMLString::transcode(e.getMessage());
  throw Isis::IException(Isis::IException::Programmer, os.str(), _FILEINFO_);
}
 
 
//  IsisXMLHandler: Overrides of the SAX DocumentHandler interface
void IsisXMLHandler::characters(const XMLCh *const chars,
                                const XMLSize_t length) {
 
  if(value != NULL) {
    QString str;
    str = XERCES::XMLString::transcode(chars);
    str = str.trimmed();
    *value += str;
  }
}
 
 
void IsisXMLHandler::endDocument() {
}
 
 
void IsisXMLHandler::endElement(const XMLCh *const uri,
                                const XMLCh *const localname,
                                const XMLCh *const qname) {
 
  if(outputEndTag > 0) {
    QString str;
    str = XERCES::XMLString::transcode(localname);
    *value += "</" + str + ">";
    outputEndTag--;
  }
  else {
    parser->setContentHandler(prevDocHandler);
    parser->setErrorHandler(prevErrorHandler);
  }
}
 
 
void IsisXMLHandler::ignorableWhitespace(const XMLCh *const chars,
    const unsigned int length) {
}
 
 
void IsisXMLHandler::processingInstruction(const XMLCh *const target,
    const XMLCh *const data) {
}
 
 
void IsisXMLHandler::startDocument() {
}
 
 
void IsisXMLHandler::startElement(const XMLCh *const uri,
                                  const XMLCh *const localname,
                                  const XMLCh *const qname,
                                  const XERCES::Attributes &attributes) {
 
  if(value != NULL) {
    QString str;
    str = XERCES::XMLString::transcode(localname);
    // Note: need to build the attributes into the string too
    *value += "<" + str + ">";
    outputEndTag++;
  }
}