| # Gaudi Framework, version v21r10p1 |

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# XMLFileCatalog.cpp

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    00001 #include "xercesc/framework/LocalFileFormatTarget.hpp"
    00002 #include "xercesc/framework/MemBufInputSource.hpp"
    00003 #include "xercesc/sax/SAXParseException.hpp"
    00004 #include "xercesc/sax/EntityResolver.hpp"
    00005 #include "xercesc/sax/InputSource.hpp"
    00006 #include "xercesc/parsers/XercesDOMParser.hpp"
    00007 #include "xercesc/util/PlatformUtils.hpp"
    00008 #include "xercesc/util/XercesDefs.hpp"
    00009 #include "xercesc/util/XMLUni.hpp"
    00010 #include "xercesc/util/XMLURL.hpp"
    00011 #include "xercesc/util/XMLString.hpp"
    00012 #include "xercesc/dom/DOM.hpp"
    00013
    00014 #include "GaudiKernel/MsgStream.h"
    00015 #include "GaudiKernel/Service.h"
    00016 #include "Reflex/PluginService.h"
    00017
    00018 #include "XMLFileCatalog.h"
    00019
    00020 #include <fstream>
    00021 #include <iostream>
    00022 #include <stdexcept>
    00023 #include <sys/types.h>
    00024 #include <sys/stat.h>
    00025 #include "uuid/uuid.h"
    00026
    00027 using namespace xercesc;
    00028 using namespace Gaudi;
    00029 using namespace std;
    00030
    00031 #if _XERCES_VERSION <= 30000
    00032 // API change between XercesC 2 and 3
    00033 #define setIdAttribute(a, b) setIdAttribute(a)
    00034 #endif
    00035
    00036 PLUGINSVC_FACTORY(XMLFileCatalog,IInterface*(std::string, IMessageSvc*))
    00037
    00038 namespace {
    00039
    00040   typedef const string& CSTR;
    00041   inline string _toString(const XMLCh *toTranscode)  {
    00042     char * buff = XMLString::transcode(toTranscode);
    00043     string tmp(buff==0 ? "" : buff);
    00044     XMLString::release(&buff);
    00045     return tmp;
    00046   }
    00047   struct __Init  {
    00048     __Init() {
    00049       try { XMLPlatformUtils::Initialize();      }
    00050       catch (const XMLException& e)   {
    00051         cout << "Xerces-c error in initialization:" << _toString(e.getMessage()) << endl;
    00052       }
    00053     }
    00054     ~__Init() {
    00055       XMLPlatformUtils::Terminate();
    00056     }
    00057   };
    00058   __Init __In__;
    00059
    00060   struct XMLStr  {
    00061     XMLCh* m_xml;
    00062     XMLStr(CSTR c)                { m_xml=XMLString::transcode(c.c_str());  }
    00063     ~XMLStr()                     { if (m_xml) XMLString::release(&m_xml);  }
    00064     operator const XMLCh*() const { return m_xml;                           }
    00065   };
    00066   struct XMLTag : public XMLStr {
    00067     string m_str;
    00068     XMLTag(CSTR s) : XMLStr(s), m_str(s) {  }
    00069     ~XMLTag()                            {  }
    00070     operator CSTR () const  { return m_str; }
    00071   };
    00072   // bool operator==(const XMLTag& b, CSTR c) {  return c==b.m_str; }
    00073   bool operator==(CSTR c, const XMLTag& b) {  return c==b.m_str; }
    00074   struct XMLCollection  {
    00075     DOMElement* m_node;
    00076     XMLCollection(DOMNode* n, bool use_children=true) : m_node((DOMElement*)n) {
    00077       if ( use_children )  {
    00078         if ( m_node ) m_node = (DOMElement*)m_node->getFirstChild();
    00079         if ( m_node && m_node->getNodeType() != DOMNode::ELEMENT_NODE ) ++(*this);
    00080       }
    00081     }
    00082     operator bool()  const                { return 0 != m_node;                         }
    00083     operator DOMNode* () const            { return m_node;                              }
    00084     operator DOMElement* () const         { return m_node;                              }
    00085     DOMElement* operator->() const        { return m_node;                              }
    00086     string attr(const XMLTag& tag) const  { return _toString(m_node->getAttribute(tag));}
    00087     string attr(CSTR tag)  const          { return attr(XMLTag(tag));                   }
    00088     string tag() const                    { return _toString(m_node->getTagName());     }
    00089     void operator++()   {
    00090       while(m_node)  {
    00091         m_node = (DOMElement*)m_node->getNextSibling();
    00092         if ( m_node && m_node->getNodeType() == DOMNode::ELEMENT_NODE ) {
    00093           return;
    00094         }
    00095       }
    00096     }
    00097   };
    00098   struct ErrHandler : public ErrorHandler    {
    00100     IMessageSvc* m_msg;
    00102     ErrHandler(IMessageSvc* m) : m_msg(m) {}
    00104     void resetErrors()                          {      }
    00106     void warning(const SAXParseException& /* e */)    {     }
    00108     void error(const SAXParseException& e);
    00110     void fatalError(const SAXParseException& e);
    00111   };
    00112   struct DTDRedirect : public EntityResolver  {
    00113     InputSource* resolveEntity(const XMLCh* const /* pubId */, const XMLCh* const /* sysId */)  {
    00114       static const char* dtdID = "redirectinmem.dtd";
    00115       static const char* dtd = \
    00116         "\
    00117         <!ELEMENT POOLFILECATALOG (META*,File*)>\
    00118         <!ELEMENT META EMPTY>\
    00119         <!ELEMENT File (physical,logical,metadata*)>\
    00120         <!ATTLIST META name CDATA #REQUIRED>\
    00121         <!ATTLIST META type CDATA #REQUIRED>\
    00122         <!ELEMENT physical (pfn)+>\
    00123         <!ELEMENT logical (lfn)*>\
    00124         <!ELEMENT metadata EMPTY>\
    00125         <!ELEMENT lfn EMPTY>\
    00126         <!ELEMENT pfn EMPTY>\
    00127         <!ATTLIST File ID ID  #REQUIRED>\
    00128         <!ATTLIST pfn name ID #REQUIRED>\
    00129         <!ATTLIST pfn filetype CDATA #IMPLIED>\
    00130         <!ATTLIST lfn name ID #REQUIRED>\
    00131         <!ATTLIST metadata att_name  CDATA #REQUIRED>\
    00132         <!ATTLIST metadata att_value CDATA #REQUIRED>\
    00133         ";
    00134       static const size_t len = strlen(dtd);
    00135       return new MemBufInputSource((const XMLByte*)dtd,len,dtdID,false);
    00136     }
    00137   };
    00138
    00139   void ErrHandler::error(const SAXParseException& e)  {
    00140     string m(_toString(e.getMessage()));
    00141     if (m.find("The values for attribute 'name' must be names or name tokens")!=string::npos ||
    00142       m.find("The values for attribute 'ID' must be names or name tokens")!=string::npos   ||
    00143       m.find("for attribute 'name' must be Name or Nmtoken")!=string::npos                 ||
    00144       m.find("for attribute 'ID' must be Name or Nmtoken")!=string::npos                   ||
    00145       m.find("for attribute 'name' is invalid Name or NMTOKEN value")!=string::npos        ||
    00146       m.find("for attribute 'ID' is invalid Name or NMTOKEN value")!=string::npos      )
    00147       return;
    00148     string sys(_toString(e.getSystemId()));
    00149     MsgStream log(m_msg,"XMLCatalog");
    00150     log << MSG::ERROR << "Error at file \""  << sys
    00151       << "\", line " << e.getLineNumber() << ", column " << e.getColumnNumber() << endmsg
    00152       << "Message: " << m << endmsg;
    00153   }
    00154   void ErrHandler::fatalError(const SAXParseException& e)  {
    00155     MsgStream log(m_msg,"XMLCatalog");
    00156     string m(_toString(e.getMessage()));
    00157     string sys(_toString(e.getSystemId()));
    00158     log << MSG::ERROR << "Fatal Error at file \"" << sys
    00159       << "\", line " << e.getLineNumber() << ", column " << e.getColumnNumber() << endmsg
    00160       << "Message: " << m << endmsg;
    00161     throw runtime_error( "Standard pool exception : Fatal Error on the DOM Parser" );
    00162   }
    00163
    00164   const XMLTag EmptyCatalog("<!-- Edited By POOL -->\n"
    00165                               "<!DOCTYPE POOLFILECATALOG SYSTEM \"InMemory\">\n"
    00166                               "<POOLFILECATALOG>\n"
    00167                               "</POOLFILECATALOG>\n");
    00168   const XMLTag PFNCOLL         ("physical");
    00169   const XMLTag LFNCOLL         ("logical");
    00170   const XMLTag PFNNODE         ( "pfn");
    00171   const XMLTag LFNNODE         ( "lfn");
    00172   const XMLTag Attr_type       ( "type");
    00173   const XMLTag Attr_ID         ( "ID");
    00174   const XMLTag Attr_name       ( "name");
    00175   const XMLTag Attr_ftype      ( "filetype");
    00176   const XMLTag MetaNode        ( "metadata");
    00177   const XMLTag Attr_metaName   ( "att_name");
    00178   const XMLTag Attr_metaValue  ( "att_value");
    00179 }
    00180
    00182 std::string Gaudi::createGuidAsString()  {
    00183   char text[64];
    00184   uuid_t uuid;
    00185   ::uuid_generate_time(uuid);
    00186   struct Guid {
    00187     unsigned int   Data1;
    00188     unsigned short Data2;
    00189     unsigned short Data3;
    00190     unsigned char  Data4[8];
    00191   } *g = (Guid*)&uuid;
    00192   ::sprintf(text, "%08X-%04hX-%04hX-%02hhX%02hhX-%02hhX%02hhX%02hhX%02hhX%02hhX%02hhX",
    00193             g->Data1, g->Data2, g->Data3,
    00194             g->Data4[0], g->Data4[1], g->Data4[2], g->Data4[3],
    00195             g->Data4[4], g->Data4[5], g->Data4[6], g->Data4[7]);
    00196   return text;
    00197 }
    00198 // ----------------------------------------------------------------------------
    00199 XMLFileCatalog::XMLFileCatalog(CSTR uri, IMessageSvc* m)
    00200 : m_rdOnly(false),m_update(false),m_doc(0),m_parser(0),m_errHdlr(0),
    00201   m_file(uri), m_msgSvc(m)
    00202 {
    00203 }
    00204 // ----------------------------------------------------------------------------
    00205 XMLFileCatalog::~XMLFileCatalog()   {
    00206   if (m_parser) delete m_parser;
    00207   m_parser = 0;
    00208   if (m_errHdlr) delete m_errHdlr;
    00209   m_errHdlr = 0;
    00210   m_doc = 0;
    00211 }
    00212 // ----------------------------------------------------------------------------
    00214 std::string XMLFileCatalog::createFID()  const {
    00215   return createGuidAsString();
    00216 }
    00217 // ----------------------------------------------------------------------------
    00218 DOMDocument* XMLFileCatalog::getDoc(bool throw_if_no_exists)  const  {
    00219   if ( !m_doc && throw_if_no_exists )
    00220     printError("The XML catalog was not started.",true);
    00221   return m_doc;
    00222 }
    00223 // ----------------------------------------------------------------------------
    00224 void XMLFileCatalog::printError(CSTR msg, bool rethrow)  const  {
    00225   MsgStream log(m_msgSvc,"XMLCatalog");
    00226   log << MSG::FATAL << msg << endmsg;
    00227   if ( rethrow )  {
    00228     throw runtime_error("XMLFileCatalog> "+msg);
    00229   }
    00230 }
    00231 // ----------------------------------------------------------------------------
    00232 void XMLFileCatalog::init()   {
    00233   string xmlFile = getfile(false);
    00234   try{
    00235     if ( m_parser ) delete m_parser;
    00236     m_parser = new XercesDOMParser;
    00237     m_parser->setValidationScheme(XercesDOMParser::Val_Auto);
    00238     m_parser->setDoNamespaces(false);
    00239     DTDRedirect dtdinmem;
    00240     m_parser->setEntityResolver(&dtdinmem);
    00241     if ( ! m_errHdlr ) m_errHdlr = new ErrHandler(m_msgSvc);
    00242     m_parser->setErrorHandler(m_errHdlr);
    00243     if ( !xmlFile.empty() )  {
    00244       m_parser->parse(xmlFile.c_str());
    00245     }
    00246     else  {
    00247       const std::string& s = EmptyCatalog;
    00248       MemBufInputSource src((const XMLByte*)s.c_str(),s.length(),"MemCatalog");
    00249       m_parser->parse(src);
    00250     }
    00251     m_doc = m_parser->getDocument();
    00252   }
    00253   catch (const XMLException& e) {
    00254     printError("XML parse error["+xmlFile+"]: "+_toString(e.getMessage()));
    00255   }
    00256   catch (const DOMException& e) {
    00257     printError("XML parse error["+xmlFile+"]: "+_toString(e.getMessage()));
    00258   }
    00259   catch (...)  {
    00260     printError("UNKNOWN XML parse error in file "+xmlFile);
    00261   }
    00262 }
    00263 // ----------------------------------------------------------------------------
    00264 string XMLFileCatalog::lookupFID(const std::string& fid)  const  {
    00265   std::string result;
    00266   DOMNode* e = element(fid,false);
    00267   e = e ? e->getParentNode() : 0;    // Mode up to <logical>
    00268   e = e ? e->getParentNode() : 0;    // Mode up to <File>
    00269   if ( e ) {
    00270     if ( e->getAttributes() ) { // Need to check this. The node may be no DOMElement
    00271       char* nam = XMLString::transcode(((DOMElement*)e)->getAttribute(Attr_ID));
    00272       if ( nam ) result = nam;
    00273       XMLString::release(&nam);
    00274     }
    00275   }
    00276   return result;
    00277 }
    00278 // ----------------------------------------------------------------------------
    00279 void XMLFileCatalog::getFID(Strings& fids) const {
    00280   fids.clear();
    00281   DOMNode* fde = getDoc(true)->getElementsByTagName(XMLStr("*"))->item(0);
    00282   for(XMLCollection c(child(fde,"File"), false); c; ++c)
    00283     fids.push_back(c.attr(Attr_ID));
    00284 }
    00285 // ----------------------------------------------------------------------------
    00286 void XMLFileCatalog::getPFN(CSTR fid, Files& files)  const {
    00287   files.clear();
    00288   for(XMLCollection c(child(child(element(fid,false),PFNCOLL),PFNNODE), false); c; ++c)
    00289     files.push_back(make_pair(c.attr(Attr_name),c.attr(Attr_ftype)));
    00290 }
    00291 // ----------------------------------------------------------------------------
    00292 void XMLFileCatalog::getLFN(CSTR fid, Files& files) const  {
    00293   files.clear();
    00294   for(XMLCollection c(child(child(element(fid,false),LFNCOLL),LFNNODE), false); c; ++c)
    00295     files.push_back(make_pair(c.attr(Attr_name),fid));
    00296 }
    00297 // ----------------------------------------------------------------------------
    00298 void XMLFileCatalog::getMetaData(CSTR fid, Attributes& attr)  const  {
    00299   attr.clear();
    00300   for(XMLCollection c(child(element(fid),MetaNode), false); c; ++c)
    00301     attr.push_back(make_pair(c.attr(Attr_metaName),c.attr(Attr_metaValue)));
    00302   if ( attr.size() > 0 )
    00303     attr.push_back(make_pair("guid",fid));
    00304 }
    00305 // ----------------------------------------------------------------------------
    00306 DOMNode* XMLFileCatalog::child(DOMNode* par,CSTR tag,CSTR attr,CSTR val) const {
    00307   for(XMLCollection c(par); c; ++c ) {
    00308     if( c.tag() == tag )  {
    00309       if( !attr.empty() && c.attr(attr) != val) continue;
    00310       return c;
    00311     }
    00312   }
    00313   return 0;
    00314 }
    00315 // ----------------------------------------------------------------------------
    00316 void XMLFileCatalog::setMetaData(CSTR fid, CSTR attr, CSTR val)  const  {
    00317   if ( !readOnly() )  {
    00318     DOMNode*    node = element(fid);
    00319     DOMElement* mnod = (DOMElement*)child(node,MetaNode,Attr_metaName,attr);
    00320     if (!mnod){
    00321       mnod = getDoc(true)->createElement(MetaNode);
    00322       node->appendChild(mnod);
    00323       mnod->setAttribute(Attr_metaName,XMLStr(attr));
    00324     }
    00325     mnod->setAttribute(Attr_metaValue,XMLStr(val));
    00326     m_update = true;
    00327     return;
    00328   }
    00329   printError("Cannot update readonly catalog!");
    00330 }
    00331 // ----------------------------------------------------------------------------
    00332 string XMLFileCatalog::getMetaDataItem(CSTR fid,CSTR attr) const  {
    00333   XMLCollection c(child(getDoc(true)->getElementById(XMLStr(fid)),MetaNode,Attr_metaName,attr));
    00334   return c ? c.attr(attr) : string("");
    00335 }
    00336 // ----------------------------------------------------------------------------
    00337 void XMLFileCatalog::dropMetaData(CSTR fid,CSTR attr) const  {
    00338   vector<DOMNode*> gbc;
    00339   DOMNode* fn = getDoc(true)->getElementById(XMLStr(fid));
    00340   for(XMLCollection c(child(fn,MetaNode)); c; ++c)
    00341     if ( attr[0]=='*' || !c.attr(attr).empty() ) gbc.push_back(c);
    00342   for(vector<DOMNode*>::iterator i=gbc.begin(); i != gbc.end(); i++)
    00343     fn->removeChild(*i);
    00344 }
    00345 // ----------------------------------------------------------------------------
    00346 DOMNode* XMLFileCatalog::element(CSTR element_name,bool print_err) const {
    00347   DOMNode* node = getDoc(true)->getElementById(XMLStr(element_name));
    00348   if ( !node && print_err ) printError("Cannot find element:"+element_name);
    00349   return node;
    00350 }
    00351 // ----------------------------------------------------------------------------
    00352 void XMLFileCatalog::deleteFID(CSTR fid) const {
    00353   DOMNode *pn = 0, *fn = element(fid);
    00354   if ( fn ) pn = fn->getParentNode();
    00355   if ( pn ) pn->removeChild(fn);
    00356 }
    00357 // ----------------------------------------------------------------------------
    00358 void XMLFileCatalog::registerFID(CSTR fid) const {
    00359   if ( !fid.empty() ) {
    00360     std::pair<DOMElement*, DOMElement*> res = i_registerFID(fid);
    00361     if ( res.first == 0 || res.second == 0 )  {
    00362       printError("Failed to register FID:"+fid);
    00363     }
    00364     return;
    00365   }
    00366   throw runtime_error("XMLFileCatalog> Cannot register LFN for invalid FID:"+fid);
    00367 }
    00368 // ----------------------------------------------------------------------------
    00369 std::pair<DOMElement*,DOMElement*> XMLFileCatalog::i_registerFID(CSTR fid) const {
    00370   if ( !readOnly() )  {
    00372     DOMElement *file = (DOMElement*)element(fid,false), *phyelem = 0, *logelem = 0;
    00373     DOMDocument* doc = getDoc(true);
    00374     if ( !file )  {
    00375       DOMNode* fde = doc->getElementsByTagName(XMLStr("*"))->item(0);
    00376       file = m_doc->createElement(XMLStr("File"));
    00377       file->setAttribute(Attr_ID, XMLStr(fid));
    00378       file->setIdAttribute(Attr_ID, true);
    00379       fde->appendChild(file);
    00380       m_update = true;
    00381     }
    00382     for(XMLCollection c1(file); c1; ++c1 )  {
    00383       char* nam = XMLString::transcode(c1->getNodeName());
    00384       if ( nam == PFNCOLL ) phyelem = c1;
    00385       if ( nam == LFNCOLL ) logelem = c1;
    00386       XMLString::release(&nam);
    00387     }
    00388     if ( !phyelem )  {
    00389       phyelem = doc->createElement(PFNCOLL);
    00390       file->appendChild(phyelem);
    00391       m_update = true;
    00392     }
    00393     if ( !logelem )  {
    00394       logelem = doc->createElement(LFNCOLL);
    00395       file->appendChild(logelem);
    00396       m_update = true;
    00397     }
    00398     return std::make_pair(logelem,phyelem);
    00399   }
    00400   printError("Cannot update readonly catalog!");
    00401   return std::pair<DOMElement*, DOMElement*>(0,0);
    00402 }
    00403 // ----------------------------------------------------------------------------
    00404 void XMLFileCatalog::registerPFN(CSTR fid, CSTR pfn, CSTR ftype) const {
    00405   if ( !fid.empty() )  {
    00406     std::pair<DOMElement*,DOMElement*> res = i_registerFID(fid);
    00407     DOMElement* phyelem = res.second, *fnelem = 0;
    00408     for(XMLCollection c(phyelem); c; ++c )  {
    00409       char* nam = XMLString::transcode(c->getNodeName());
    00410       if ( nam == PFNNODE )  {
    00411         XMLString::release(&nam);
    00412         nam = XMLString::transcode(c->getAttribute(Attr_name));
    00413         if ( nam == pfn )  {
    00414           XMLString::release(&nam);
    00415           fnelem = c;
    00416           break;
    00417         }
    00418       }
    00419       XMLString::release(&nam);
    00420     }
    00421     if ( !fnelem )  {
    00422       fnelem = getDoc(true)->createElement(PFNNODE);
    00423       phyelem->appendChild(fnelem);
    00424       fnelem->setAttribute(Attr_ftype,XMLStr(ftype));
    00425       fnelem->setAttribute(Attr_name,XMLStr(pfn));
    00426       fnelem->setIdAttribute(Attr_name, true);
    00427       m_update = true;
    00428     }
    00429     return;
    00430   }
    00431   throw runtime_error("XMLFileCatalog> Cannot register PFN for invalid FID:"+fid);
    00432 }
    00433 // ----------------------------------------------------------------------------
    00434 void XMLFileCatalog::registerLFN(CSTR fid, CSTR lfn) const {
    00435   if ( !fid.empty() )  {
    00436     std::pair<DOMElement*, DOMElement*> res = i_registerFID(fid);
    00437     DOMElement* logelem = res.first, *fnelem = 0;
    00438     for(XMLCollection c(logelem); c; ++c )  {
    00439       char* nam = XMLString::transcode(c->getNodeName());
    00440       if ( nam == LFNNODE )  {
    00441         XMLString::release(&nam);
    00442         nam = XMLString::transcode(c->getAttribute(Attr_name));
    00443         if ( nam == lfn )  {
    00444           XMLString::release(&nam);
    00445           fnelem = c;
    00446           break;
    00447         }
    00448       }
    00449     }
    00450     if ( !fnelem )  {
    00451       fnelem = getDoc(true)->createElement(LFNNODE);
    00452       logelem->appendChild(fnelem);
    00453       fnelem->setAttribute(Attr_name,XMLStr(lfn));
    00454       fnelem->setIdAttribute(Attr_name, true);
    00455       m_update = true;
    00456     }
    00457     return;
    00458   }
    00459   throw runtime_error("XMLFileCatalog> Cannot register LFN for invalid FID:"+fid);
    00460 }
    00461 // ----------------------------------------------------------------------------
    00462 void XMLFileCatalog::commit()    {
    00463   try {
    00464     if ( dirty() && !readOnly() )  {
    00465       string xmlfile = getfile(true);
    00466       XMLStr ii("LS");
    00467       DOMImplementation *imp = DOMImplementationRegistry::getDOMImplementation(ii);
    00468       XMLFormatTarget   *tar = new LocalFileFormatTarget(xmlfile.c_str());
    00469 #if _XERCES_VERSION <= 30000
    00470       DOMWriter         *wr  = imp->createDOMWriter();
    00471       wr->setFeature(XMLUni::fgDOMWRTFormatPrettyPrint, true);
    00472       wr->writeNode(tar, *m_doc);
    00473       wr->release();
    00474 #else
    00475       DOMLSOutput       *output = imp->createLSOutput();
    00476       output->setByteStream(tar);
    00477       DOMLSSerializer   *wr     = imp->createLSSerializer();
    00478       wr->getDomConfig()->setParameter(XMLStr("format-pretty-print"), true);
    00479       wr->write(m_doc, output);
    00480       output->release();
    00481       wr->release();
    00482 #endif
    00483       delete  tar;
    00484     }
    00485   }
    00486   catch ( exception& e )  {
    00487     printError(string("Cannot open output file:")+e.what());
    00488   }
    00489   catch (...)  {
    00490     printError("Unknown IO rrror.");
    00491   }
    00492 }
    00493 // ----------------------------------------------------------------------------
    00494 string XMLFileCatalog::getfile(bool create)   {
    00495   string protocol, path;
    00496   XMLURL xerurl;
    00497   try{
    00498     xerurl   = (const XMLCh*)XMLStr(m_file);
    00499     protocol = _toString(xerurl.getProtocolName());
    00500     path     = _toString(xerurl.getPath());
    00501   }
    00502   catch (const XMLException& e ) {
    00503     printError(_toString(e.getMessage()));
    00504   }
    00505   if ( protocol.empty() )    {
    00506     printError("Missing protocol.");
    00507   }
    00508   else if ( protocol == "http" || protocol == "ftp" )  {
    00509     m_rdOnly = true;
    00510   }
    00511   else if ( protocol == "file" ) {
    00512     m_rdOnly = false;
    00513     struct stat buff;
    00514     int exist = ::stat(path.c_str(),&buff) != -1;
    00515     if ( create && !exist )  {
    00516       MsgStream log(m_msgSvc,"XMLCatalog");
    00517       log << MSG::INFO << "File '" << path << "' does not exist. New file created." << endmsg;
    00518       ofstream out(path.c_str());
    00519       if( !m_rdOnly && out.is_open() ) {
    00520         out << (CSTR)EmptyCatalog << endl;
    00521       }
    00522       else     {
    00523         printError("Problem creating file "+path);
    00524       }
    00525       out.close();
    00526     }
    00527     else if ( exist )  {
    00528       return path;
    00529     }
    00530     else if ( !create )  {
    00531       return "";
    00532     }
    00533   }
    00534   else  {
    00535     printError(protocol + ": protocol not supported.");
    00536   }
    00537   return path;
    00538 }