| # Gaudi Framework, version v22r4 |

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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 #include <boost/format.hpp>
    00028
    00029 using namespace xercesc;
    00030 using namespace Gaudi;
    00031 using namespace std;
    00032
    00033 #if _XERCES_VERSION <= 30000
    00034 // API change between XercesC 2 and 3
    00035 #define setIdAttribute(a, b) setIdAttribute(a)
    00036 #endif
    00037
    00038 PLUGINSVC_FACTORY(XMLFileCatalog,IInterface*(std::string, IMessageSvc*))
    00039
    00040 namespace {
    00041
    00042   typedef const string& CSTR;
    00043   inline string _toString(const XMLCh *toTranscode)  {
    00044     char * buff = XMLString::transcode(toTranscode);
    00045     string tmp(buff==0 ? "" : buff);
    00046     XMLString::release(&buff);
    00047     return tmp;
    00048   }
    00049   struct __Init  {
    00050     __Init() {
    00051       try { XMLPlatformUtils::Initialize();      }
    00052       catch (const XMLException& e)   {
    00053         cout << "Xerces-c error in initialization:" << _toString(e.getMessage()) << endl;
    00054       }
    00055     }
    00056     ~__Init() {
    00057       XMLPlatformUtils::Terminate();
    00058     }
    00059   };
    00060   __Init __In__;
    00061
    00062   struct XMLStr  {
    00063     XMLCh* m_xml;
    00064     XMLStr(CSTR c)                { m_xml=XMLString::transcode(c.c_str());  }
    00065     ~XMLStr()                     { if (m_xml) XMLString::release(&m_xml);  }
    00066     operator const XMLCh*() const { return m_xml;                           }
    00067   };
    00068   struct XMLTag : public XMLStr {
    00069     string m_str;
    00070     XMLTag(CSTR s) : XMLStr(s), m_str(s) {  }
    00071     ~XMLTag()                            {  }
    00072     operator CSTR () const  { return m_str; }
    00073   };
    00074   // bool operator==(const XMLTag& b, CSTR c) {  return c==b.m_str; }
    00075   bool operator==(CSTR c, const XMLTag& b) {  return c==b.m_str; }
    00076   struct XMLCollection  {
    00077     DOMElement* m_node;
    00078     XMLCollection(DOMNode* n, bool use_children=true) : m_node((DOMElement*)n) {
    00079       if ( use_children )  {
    00080         if ( m_node ) m_node = (DOMElement*)m_node->getFirstChild();
    00081         if ( m_node && m_node->getNodeType() != DOMNode::ELEMENT_NODE ) ++(*this);
    00082       }
    00083     }
    00084     operator bool()  const                { return 0 != m_node;                         }
    00085     operator DOMNode* () const            { return m_node;                              }
    00086     operator DOMElement* () const         { return m_node;                              }
    00087     DOMElement* operator->() const        { return m_node;                              }
    00088     string attr(const XMLTag& tag) const  { return _toString(m_node->getAttribute(tag));}
    00089     string attr(CSTR tag)  const          { return attr(XMLTag(tag));                   }
    00090     string tag() const                    { return _toString(m_node->getTagName());     }
    00091     void operator++()   {
    00092       while(m_node)  {
    00093         m_node = (DOMElement*)m_node->getNextSibling();
    00094         if ( m_node && m_node->getNodeType() == DOMNode::ELEMENT_NODE ) {
    00095           return;
    00096         }
    00097       }
    00098     }
    00099   };
    00100   struct ErrHandler : public ErrorHandler    {
    00102     IMessageSvc* m_msg;
    00104     ErrHandler(IMessageSvc* m) : m_msg(m) {}
    00106     void resetErrors()                          {      }
    00108     void warning(const SAXParseException& /* e */)    {     }
    00110     void error(const SAXParseException& e);
    00112     void fatalError(const SAXParseException& e);
    00113     virtual ~ErrHandler() {}
    00114   };
    00115   struct DTDRedirect : public EntityResolver  {
    00116     InputSource* resolveEntity(const XMLCh* const /* pubId */, const XMLCh* const /* sysId */)  {
    00117       static const char* dtdID = "redirectinmem.dtd";
    00118       static const char* dtd = \
    00119         "\
    00120         <!ELEMENT POOLFILECATALOG (META*,File*)>\
    00121         <!ELEMENT META EMPTY>\
    00122         <!ELEMENT File (physical,logical,metadata*)>\
    00123         <!ATTLIST META name CDATA #REQUIRED>\
    00124         <!ATTLIST META type CDATA #REQUIRED>\
    00125         <!ELEMENT physical (pfn)+>\
    00126         <!ELEMENT logical (lfn)*>\
    00127         <!ELEMENT metadata EMPTY>\
    00128         <!ELEMENT lfn EMPTY>\
    00129         <!ELEMENT pfn EMPTY>\
    00130         <!ATTLIST File ID ID  #REQUIRED>\
    00131         <!ATTLIST pfn name ID #REQUIRED>\
    00132         <!ATTLIST pfn filetype CDATA #IMPLIED>\
    00133         <!ATTLIST lfn name ID #REQUIRED>\
    00134         <!ATTLIST metadata att_name  CDATA #REQUIRED>\
    00135         <!ATTLIST metadata att_value CDATA #REQUIRED>\
    00136         ";
    00137       static const size_t len = strlen(dtd);
    00138       return new MemBufInputSource((const XMLByte*)dtd,len,dtdID,false);
    00139     }
    00140     virtual ~DTDRedirect() {}
    00141   };
    00142
    00143   void ErrHandler::error(const SAXParseException& e)  {
    00144     string m(_toString(e.getMessage()));
    00145     if (m.find("The values for attribute 'name' must be names or name tokens")!=string::npos ||
    00146       m.find("The values for attribute 'ID' must be names or name tokens")!=string::npos   ||
    00147       m.find("for attribute 'name' must be Name or Nmtoken")!=string::npos                 ||
    00148       m.find("for attribute 'ID' must be Name or Nmtoken")!=string::npos                   ||
    00149       m.find("for attribute 'name' is invalid Name or NMTOKEN value")!=string::npos        ||
    00150       m.find("for attribute 'ID' is invalid Name or NMTOKEN value")!=string::npos      )
    00151       return;
    00152     string sys(_toString(e.getSystemId()));
    00153     MsgStream log(m_msg,"XMLCatalog");
    00154     log << MSG::ERROR << "Error at file \""  << sys
    00155       << "\", line " << e.getLineNumber() << ", column " << e.getColumnNumber() << endmsg
    00156       << "Message: " << m << endmsg;
    00157   }
    00158   void ErrHandler::fatalError(const SAXParseException& e)  {
    00159     MsgStream log(m_msg,"XMLCatalog");
    00160     string m(_toString(e.getMessage()));
    00161     string sys(_toString(e.getSystemId()));
    00162     log << MSG::ERROR << "Fatal Error at file \"" << sys
    00163       << "\", line " << e.getLineNumber() << ", column " << e.getColumnNumber() << endmsg
    00164       << "Message: " << m << endmsg;
    00165     throw runtime_error( "Standard pool exception : Fatal Error on the DOM Parser" );
    00166   }
    00167
    00168   const XMLTag EmptyCatalog("<!-- Edited By POOL -->\n"
    00169                               "<!DOCTYPE POOLFILECATALOG SYSTEM \"InMemory\">\n"
    00170                               "<POOLFILECATALOG>\n"
    00171                               "</POOLFILECATALOG>\n");
    00172   const XMLTag PFNCOLL         ("physical");
    00173   const XMLTag LFNCOLL         ("logical");
    00174   const XMLTag PFNNODE         ( "pfn");
    00175   const XMLTag LFNNODE         ( "lfn");
    00176   const XMLTag Attr_type       ( "type");
    00177   const XMLTag Attr_ID         ( "ID");
    00178   const XMLTag Attr_name       ( "name");
    00179   const XMLTag Attr_ftype      ( "filetype");
    00180   const XMLTag MetaNode        ( "metadata");
    00181   const XMLTag Attr_metaName   ( "att_name");
    00182   const XMLTag Attr_metaValue  ( "att_value");
    00183 }
    00184
    00186 std::string Gaudi::createGuidAsString()  {
    00187   uuid_t uuid;
    00188   ::uuid_generate_time(uuid);
    00189   struct Guid {
    00190     unsigned int   Data1;
    00191     unsigned short Data2;
    00192     unsigned short Data3;
    00193     unsigned char  Data4[8];
    00194   } *g = (Guid*)&uuid;
    00195
    00196   boost::format text("%08X-%04X-%04X-%02X%02X-%02X%02X%02X%02X%02X%02X");
    00197   text % g->Data1 % g->Data2 % g->Data3;
    00198   for (int i = 0; i < 8; ++i)
    00199     text % (unsigned short)g->Data4[i];
    00200   return text.str();
    00201 }
    00202 // ----------------------------------------------------------------------------
    00203 XMLFileCatalog::XMLFileCatalog(CSTR uri, IMessageSvc* m)
    00204 : m_rdOnly(false),m_update(false),m_doc(0),m_parser(0),m_errHdlr(0),
    00205   m_file(uri), m_msgSvc(m)
    00206 {
    00207 }
    00208 // ----------------------------------------------------------------------------
    00209 XMLFileCatalog::~XMLFileCatalog()   {
    00210   if (m_parser) delete m_parser;
    00211   m_parser = 0;
    00212   if (m_errHdlr) delete m_errHdlr;
    00213   m_errHdlr = 0;
    00214   m_doc = 0;
    00215 }
    00216 // ----------------------------------------------------------------------------
    00218 std::string XMLFileCatalog::createFID()  const {
    00219   return createGuidAsString();
    00220 }
    00221 // ----------------------------------------------------------------------------
    00222 DOMDocument* XMLFileCatalog::getDoc(bool throw_if_no_exists)  const  {
    00223   if ( !m_doc && throw_if_no_exists )
    00224     printError("The XML catalog was not started.",true);
    00225   return m_doc;
    00226 }
    00227 // ----------------------------------------------------------------------------
    00228 void XMLFileCatalog::printError(CSTR msg, bool rethrow)  const  {
    00229   MsgStream log(m_msgSvc,"XMLCatalog");
    00230   log << MSG::FATAL << msg << endmsg;
    00231   if ( rethrow )  {
    00232     throw runtime_error("XMLFileCatalog> "+msg);
    00233   }
    00234 }
    00235 // ----------------------------------------------------------------------------
    00236 void XMLFileCatalog::init()   {
    00237   string xmlFile = getfile(false);
    00238   try{
    00239     if ( m_parser ) delete m_parser;
    00240     m_parser = new XercesDOMParser;
    00241     m_parser->setValidationScheme(XercesDOMParser::Val_Auto);
    00242     m_parser->setDoNamespaces(false);
    00243     DTDRedirect dtdinmem;
    00244     m_parser->setEntityResolver(&dtdinmem);
    00245     if ( ! m_errHdlr ) m_errHdlr = new ErrHandler(m_msgSvc);
    00246     m_parser->setErrorHandler(m_errHdlr);
    00247     if ( !xmlFile.empty() )  {
    00248       m_parser->parse(xmlFile.c_str());
    00249     }
    00250     else  {
    00251       const std::string& s = EmptyCatalog;
    00252       MemBufInputSource src((const XMLByte*)s.c_str(),s.length(),"MemCatalog");
    00253       m_parser->parse(src);
    00254     }
    00255     m_doc = m_parser->getDocument();
    00256   }
    00257   catch (const XMLException& e) {
    00258     printError("XML parse error["+xmlFile+"]: "+_toString(e.getMessage()));
    00259   }
    00260   catch (const DOMException& e) {
    00261     printError("XML parse error["+xmlFile+"]: "+_toString(e.getMessage()));
    00262   }
    00263   catch (...)  {
    00264     printError("UNKNOWN XML parse error in file "+xmlFile);
    00265   }
    00266 }
    00267 // ----------------------------------------------------------------------------
    00268 string XMLFileCatalog::lookupFID(const std::string& fid)  const  {
    00269   std::string result;
    00270   DOMNode* e = element(fid,false);
    00271   e = e ? e->getParentNode() : 0;    // Mode up to <logical>
    00272   e = e ? e->getParentNode() : 0;    // Mode up to <File>
    00273   if ( e ) {
    00274     if ( e->getAttributes() ) { // Need to check this. The node may be no DOMElement
    00275       char* nam = XMLString::transcode(((DOMElement*)e)->getAttribute(Attr_ID));
    00276       if ( nam ) result = nam;
    00277       XMLString::release(&nam);
    00278     }
    00279   }
    00280   return result;
    00281 }
    00282 // ----------------------------------------------------------------------------
    00283 void XMLFileCatalog::getFID(Strings& fids) const {
    00284   fids.clear();
    00285   DOMNode* fde = getDoc(true)->getElementsByTagName(XMLStr("*"))->item(0);
    00286   for(XMLCollection c(child(fde,"File"), false); c; ++c)
    00287     fids.push_back(c.attr(Attr_ID));
    00288 }
    00289 // ----------------------------------------------------------------------------
    00290 void XMLFileCatalog::getPFN(CSTR fid, Files& files)  const {
    00291   files.clear();
    00292   for(XMLCollection c(child(child(element(fid,false),PFNCOLL),PFNNODE), false); c; ++c)
    00293     files.push_back(make_pair(c.attr(Attr_name),c.attr(Attr_ftype)));
    00294 }
    00295 // ----------------------------------------------------------------------------
    00296 void XMLFileCatalog::getLFN(CSTR fid, Files& files) const  {
    00297   files.clear();
    00298   for(XMLCollection c(child(child(element(fid,false),LFNCOLL),LFNNODE), false); c; ++c)
    00299     files.push_back(make_pair(c.attr(Attr_name),fid));
    00300 }
    00301 // ----------------------------------------------------------------------------
    00302 void XMLFileCatalog::getMetaData(CSTR fid, Attributes& attr)  const  {
    00303   attr.clear();
    00304   for(XMLCollection c(child(element(fid),MetaNode), false); c; ++c)
    00305     attr.push_back(make_pair(c.attr(Attr_metaName),c.attr(Attr_metaValue)));
    00306   if ( attr.size() > 0 )
    00307     attr.push_back(make_pair("guid",fid));
    00308 }
    00309 // ----------------------------------------------------------------------------
    00310 DOMNode* XMLFileCatalog::child(DOMNode* par,CSTR tag,CSTR attr,CSTR val) const {
    00311   for(XMLCollection c(par); c; ++c ) {
    00312     if( c.tag() == tag )  {
    00313       if( !attr.empty() && c.attr(attr) != val) continue;
    00314       return c;
    00315     }
    00316   }
    00317   return 0;
    00318 }
    00319 // ----------------------------------------------------------------------------
    00320 void XMLFileCatalog::setMetaData(CSTR fid, CSTR attr, CSTR val)  const  {
    00321   if ( !readOnly() )  {
    00322     DOMNode*    node = element(fid);
    00323     DOMElement* mnod = (DOMElement*)child(node,MetaNode,Attr_metaName,attr);
    00324     if (!mnod){
    00325       mnod = getDoc(true)->createElement(MetaNode);
    00326       node->appendChild(mnod);
    00327       mnod->setAttribute(Attr_metaName,XMLStr(attr));
    00328     }
    00329     mnod->setAttribute(Attr_metaValue,XMLStr(val));
    00330     m_update = true;
    00331     return;
    00332   }
    00333   printError("Cannot update readonly catalog!");
    00334 }
    00335 // ----------------------------------------------------------------------------
    00336 string XMLFileCatalog::getMetaDataItem(CSTR fid,CSTR attr) const  {
    00337   XMLCollection c(child(getDoc(true)->getElementById(XMLStr(fid)),MetaNode,Attr_metaName,attr));
    00338   return c ? c.attr(attr) : string("");
    00339 }
    00340 // ----------------------------------------------------------------------------
    00341 void XMLFileCatalog::dropMetaData(CSTR fid,CSTR attr) const  {
    00342   vector<DOMNode*> gbc;
    00343   DOMNode* fn = getDoc(true)->getElementById(XMLStr(fid));
    00344   for(XMLCollection c(child(fn,MetaNode)); c; ++c)
    00345     if ( attr[0]=='*' || !c.attr(attr).empty() ) gbc.push_back(c);
    00346   for(vector<DOMNode*>::iterator i=gbc.begin(); i != gbc.end(); i++)
    00347     fn->removeChild(*i);
    00348 }
    00349 // ----------------------------------------------------------------------------
    00350 DOMNode* XMLFileCatalog::element(CSTR element_name,bool print_err) const {
    00351   DOMNode* node = getDoc(true)->getElementById(XMLStr(element_name));
    00352   if ( !node && print_err ) printError("Cannot find element:"+element_name);
    00353   return node;
    00354 }
    00355 // ----------------------------------------------------------------------------
    00356 void XMLFileCatalog::deleteFID(CSTR fid) const {
    00357   DOMNode *pn = 0, *fn = element(fid);
    00358   if ( fn ) pn = fn->getParentNode();
    00359   if ( pn ) pn->removeChild(fn);
    00360 }
    00361 // ----------------------------------------------------------------------------
    00362 void XMLFileCatalog::registerFID(CSTR fid) const {
    00363   if ( !fid.empty() ) {
    00364     std::pair<DOMElement*, DOMElement*> res = i_registerFID(fid);
    00365     if ( res.first == 0 || res.second == 0 )  {
    00366       printError("Failed to register FID:"+fid);
    00367     }
    00368     return;
    00369   }
    00370   throw runtime_error("XMLFileCatalog> Cannot register LFN for invalid FID:"+fid);
    00371 }
    00372 // ----------------------------------------------------------------------------
    00373 std::pair<DOMElement*,DOMElement*> XMLFileCatalog::i_registerFID(CSTR fid) const {
    00374   if ( !readOnly() )  {
    00376     DOMElement *file = (DOMElement*)element(fid,false), *phyelem = 0, *logelem = 0;
    00377     DOMDocument* doc = getDoc(true);
    00378     if ( !file )  {
    00379       DOMNode* fde = doc->getElementsByTagName(XMLStr("*"))->item(0);
    00380       file = m_doc->createElement(XMLStr("File"));
    00381       file->setAttribute(Attr_ID, XMLStr(fid));
    00382       file->setIdAttribute(Attr_ID, true);
    00383       fde->appendChild(file);
    00384       m_update = true;
    00385     }
    00386     for(XMLCollection c1(file); c1; ++c1 )  {
    00387       char* nam = XMLString::transcode(c1->getNodeName());
    00388       if ( nam == PFNCOLL ) phyelem = c1;
    00389       if ( nam == LFNCOLL ) logelem = c1;
    00390       XMLString::release(&nam);
    00391     }
    00392     if ( !phyelem )  {
    00393       phyelem = doc->createElement(PFNCOLL);
    00394       file->appendChild(phyelem);
    00395       m_update = true;
    00396     }
    00397     if ( !logelem )  {
    00398       logelem = doc->createElement(LFNCOLL);
    00399       file->appendChild(logelem);
    00400       m_update = true;
    00401     }
    00402     return std::make_pair(logelem,phyelem);
    00403   }
    00404   printError("Cannot update readonly catalog!");
    00405   return std::pair<DOMElement*, DOMElement*>(0,0);
    00406 }
    00407 // ----------------------------------------------------------------------------
    00408 void XMLFileCatalog::registerPFN(CSTR fid, CSTR pfn, CSTR ftype) const {
    00409   if ( !fid.empty() )  {
    00410     std::pair<DOMElement*,DOMElement*> res = i_registerFID(fid);
    00411     DOMElement* phyelem = res.second, *fnelem = 0;
    00412     for(XMLCollection c(phyelem); c; ++c )  {
    00413       char* nam = XMLString::transcode(c->getNodeName());
    00414       if ( nam == PFNNODE )  {
    00415         XMLString::release(&nam);
    00416         nam = XMLString::transcode(c->getAttribute(Attr_name));
    00417         if ( nam == pfn )  {
    00418           XMLString::release(&nam);
    00419           fnelem = c;
    00420           break;
    00421         }
    00422       }
    00423       XMLString::release(&nam);
    00424     }
    00425     if ( !fnelem )  {
    00426       fnelem = getDoc(true)->createElement(PFNNODE);
    00427       phyelem->appendChild(fnelem);
    00428       fnelem->setAttribute(Attr_ftype,XMLStr(ftype));
    00429       fnelem->setAttribute(Attr_name,XMLStr(pfn));
    00430       fnelem->setIdAttribute(Attr_name, true);
    00431       m_update = true;
    00432     }
    00433     return;
    00434   }
    00435   throw runtime_error("XMLFileCatalog> Cannot register PFN for invalid FID:"+fid);
    00436 }
    00437 // ----------------------------------------------------------------------------
    00438 void XMLFileCatalog::registerLFN(CSTR fid, CSTR lfn) const {
    00439   if ( !fid.empty() )  {
    00440     std::pair<DOMElement*, DOMElement*> res = i_registerFID(fid);
    00441     DOMElement* logelem = res.first, *fnelem = 0;
    00442     for(XMLCollection c(logelem); c; ++c )  {
    00443       char* nam = XMLString::transcode(c->getNodeName());
    00444       if ( nam == LFNNODE )  {
    00445         XMLString::release(&nam);
    00446         nam = XMLString::transcode(c->getAttribute(Attr_name));
    00447         if ( nam == lfn )  {
    00448           XMLString::release(&nam);
    00449           fnelem = c;
    00450           break;
    00451         }
    00452       }
    00453     }
    00454     if ( !fnelem )  {
    00455       fnelem = getDoc(true)->createElement(LFNNODE);
    00456       logelem->appendChild(fnelem);
    00457       fnelem->setAttribute(Attr_name,XMLStr(lfn));
    00458       fnelem->setIdAttribute(Attr_name, true);
    00459       m_update = true;
    00460     }
    00461     return;
    00462   }
    00463   throw runtime_error("XMLFileCatalog> Cannot register LFN for invalid FID:"+fid);
    00464 }
    00465 // ----------------------------------------------------------------------------
    00466 void XMLFileCatalog::commit()    {
    00467   try {
    00468     if ( dirty() && !readOnly() )  {
    00469       string xmlfile = getfile(true);
    00470       XMLStr ii("LS");
    00471       DOMImplementation *imp = DOMImplementationRegistry::getDOMImplementation(ii);
    00472       XMLFormatTarget   *tar = new LocalFileFormatTarget(xmlfile.c_str());
    00473 #if _XERCES_VERSION <= 30000
    00474       DOMWriter         *wr  = imp->createDOMWriter();
    00475       wr->setFeature(XMLUni::fgDOMWRTFormatPrettyPrint, true);
    00476       wr->writeNode(tar, *m_doc);
    00477       wr->release();
    00478 #else
    00479       DOMLSOutput       *output = imp->createLSOutput();
    00480       output->setByteStream(tar);
    00481       DOMLSSerializer   *wr     = imp->createLSSerializer();
    00482       wr->getDomConfig()->setParameter(XMLStr("format-pretty-print"), true);
    00483       wr->write(m_doc, output);
    00484       output->release();
    00485       wr->release();
    00486 #endif
    00487       delete  tar;
    00488     }
    00489   }
    00490   catch ( exception& e )  {
    00491     printError(string("Cannot open output file:")+e.what());
    00492   }
    00493   catch (...)  {
    00494     printError("Unknown IO rrror.");
    00495   }
    00496 }
    00497 // ----------------------------------------------------------------------------
    00498 string XMLFileCatalog::getfile(bool create)   {
    00499   string protocol, path;
    00500   XMLURL xerurl;
    00501   try{
    00502     xerurl   = (const XMLCh*)XMLStr(m_file);
    00503     protocol = _toString(xerurl.getProtocolName());
    00504     path     = _toString(xerurl.getPath());
    00505   }
    00506   catch (const XMLException& e ) {
    00507     printError(_toString(e.getMessage()));
    00508   }
    00509   if ( protocol.empty() )    {
    00510     printError("Missing protocol.");
    00511   }
    00512   else if ( protocol == "http" || protocol == "ftp" )  {
    00513     m_rdOnly = true;
    00514   }
    00515   else if ( protocol == "file" ) {
    00516     m_rdOnly = false;
    00517     struct stat buff;
    00518     int exist = ::stat(path.c_str(),&buff) != -1;
    00519     if ( create && !exist )  {
    00520       MsgStream log(m_msgSvc,"XMLCatalog");
    00521       log << MSG::INFO << "File '" << path << "' does not exist. New file created." << endmsg;
    00522       ofstream out(path.c_str());
    00523       if( !m_rdOnly && out.is_open() ) {
    00524         out << (CSTR)EmptyCatalog << endl;
    00525       }
    00526       else     {
    00527         printError("Problem creating file "+path);
    00528       }
    00529       out.close();
    00530     }
    00531     else if ( exist )  {
    00532       return path;
    00533     }
    00534     else if ( !create )  {
    00535       return "";
    00536     }
    00537   }
    00538   else  {
    00539     printError(protocol + ": protocol not supported.");
    00540   }
    00541   return path;
    00542 }

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