xmlregionsource.cc

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// Tue Feb 19 21:28:47 GMT 2002  by  nts

////////////////////////////////////////////////////////////////////////////////////
//                                                                                //
// class XMLRegionSource      <<< abstract >>>                                    //
//                                                                                //
// This class defines an interface to XML Region data as defined by the XML       //
// Schema namespace "http://www.cvg.cs.reading.ac.uk/ADVISOR" (the current name). //
//                                                                                //
// Similar in design to our ImageSource classes, some methods are pure virtual    //
//   and the class should not be instantiated directly.                           //
//                                                                                //
// The XMLRegionSource class uses the XMLRegionHandler class to extract data from //
//   the XML structures.                                                          //
//                                                                                //
////////////////////////////////////////////////////////////////////////////////////


// XML libraries for SAX2 API...
#include <util/PlatformUtils.hpp> // XMLPlatformUtils class with static init/deinit methods
#include <sax2/XMLReaderFactory.hpp>  // XMLReaderFactory class with static reader methods
#include <util/XMLString.hpp>    // XMLString class with static character conversion methods
#include <sax2/SAX2XMLReader.hpp>  // which defines the SAX2 XML parser class

// our own includes
#include "XMLRegionSource.h"
#include "XMLRegionHandler.h"
#include "RegionSet.h"
#include "TrackedObjectSet.h"
#include "text_output.h"

namespace ReadingPeopleTracker
{

//////////////////////////////////////////////////////////////////////////
//   Constructor and Destructor                                         //
//////////////////////////////////////////////////////////////////////////


XMLRegionSource::XMLRegionSource()
{
    // assign default values to detect errors during initialisation
    XML_region_handler = NULL;
    XML_parser = NULL;
    
    // Initialize the XML system
    try
    {
	XMLPlatformUtils::Initialize(); // apparently, this is per-process so OK
    }
    
    catch (const XMLException &exception)
    {
	char *message = XMLString::transcode(exception.getMessage());
	
	cerror << " XMLRegionSource::XMLRegionSource(): Error during initialization: