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//$Id$
#include "XML_Helper.h"
#include "ace/Auto_Ptr.h"
#include "ace/Log_Msg.h"
#include "xercesc/util/XMLUniDefs.hpp"
#include "xercesc/dom/DOM.hpp"
#include "XML_Error_Handler.h"
namespace CIAO
{
namespace Config_Handlers
{
using xercesc::XMLException;
using xercesc::XMLString;
using xercesc::DOMImplementation;
using xercesc::DOMImplementationRegistry;
using xercesc::DOMBuilder;
using xercesc::DOMImplementationLS;
using xercesc::XMLUni;
using xercesc::DOMDocument;
using xercesc::DOMException;
XML_Helper::XML_Helper (void)
: initialized_ (false)
{
this->init_parser ();
}
XML_Helper::~XML_Helper (void)
{
this->terminate_parser ();
}
bool
XML_Helper::is_initialized (void) const
{
return this->initialized_ == true;
}
void
XML_Helper::init_parser (void)
{
if (this->initialized_)
return;
ACE_DEBUG ((LM_DEBUG,
"(%P|%t) Initializing the Xerces runtime \n"));
// Initialize the Xerces run-time
try
{
xercesc::XMLPlatformUtils::Initialize();
}
catch (const XMLException& e)
{
char* message =
XMLString::transcode (e.getMessage());
ACE_Auto_Basic_Array_Ptr<char> cleanup_message (message);
throw;
}
catch (...)
{
ACE_DEBUG ((LM_DEBUG,
"(%P|%t) Some other exception,"
" returning\n"));
return;
}
this->initialized_ = true;
return;
}
XERCES_CPP_NAMESPACE::DOMDocument *
XML_Helper::create_dom (const ACE_TCHAR *url)
{
if (url == 0)
throw;
try
{
// Instantiate the DOM parser.
static const XMLCh gLS[] = { xercesc::chLatin_L,
xercesc::chLatin_S,
xercesc::chNull };
// Get an implementation of the Load-Store (LS) interface
DOMImplementation* impl =
DOMImplementationRegistry::getDOMImplementation(gLS);
// Create a DOMBuilder
DOMBuilder* parser =
impl->createDOMBuilder (DOMImplementationLS::MODE_SYNCHRONOUS,
0);
// Discard comment nodes in the document
parser->setFeature (XMLUni::fgDOMComments, false);
// Disable datatype normalization. The XML 1.0 attribute value
// normalization always occurs though.
parser->setFeature (XMLUni::fgDOMDatatypeNormalization, true);
// Do not create EntityReference nodes in the DOM tree. No
// EntityReference nodes will be created, only the nodes
// corresponding to their fully expanded sustitution text will be
// created.
parser->setFeature (XMLUni::fgDOMEntities, false);
// Perform Namespace processing.
parser->setFeature (XMLUni::fgDOMNamespaces, true);
// Perform Validation
parser->setFeature (XMLUni::fgDOMValidation, true);
// Do not include ignorable whitespace in the DOM tree.
parser->setFeature (XMLUni::fgDOMWhitespaceInElementContent, false);
// Enable the parser's schema support.
parser->setFeature (XMLUni::fgXercesSchema, true);
// Enable full schema constraint checking, including checking which
// may be time-consuming or memory intensive. Currently, particle
// unique attribution constraint checking and particle derivation
// restriction checking are controlled by this option.
parser->setFeature (XMLUni::fgXercesSchemaFullChecking, true);
// The parser will treat validation error as fatal and will exit.
parser->setFeature (XMLUni::fgXercesValidationErrorAsFatal, true);
XML_Error_Handler handler;
parser->setErrorHandler (&handler);
DOMDocument* doc = parser->parseURI (url);
if (handler.getErrors ())
throw;
return doc;
}
catch (const DOMException& e)
{
const unsigned int maxChars = 2047;
XMLCh errText[maxChars + 1];
if (DOMImplementation::loadDOMExceptionMsg (e.code,
errText,
maxChars))
{
char* message =
XMLString::transcode (errText);
ACE_Auto_Basic_Array_Ptr<char> cleanup_message (message);
}
return 0;
}
catch (const XMLException& e)
{
char* message = XMLString::transcode (e.getMessage());
ACE_Auto_Basic_Array_Ptr<char> cleanup_message (message);
throw;
}
catch (...)
{
ACE_DEBUG ((LM_DEBUG,
"(%P|%t) Caught an unknown exception \n"));
throw;
}
return 0;
}
void
XML_Helper::terminate_parser (void)
{
try
{
xercesc::XMLPlatformUtils::Terminate();
}
catch (const XMLException& e)
{
char* message =
XMLString::transcode (e.getMessage());
ACE_Auto_Basic_Array_Ptr<char> cleanup_message (message);
throw;
}
this->initialized_ = false;
return;
}
}
}
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