XercesDomReader.hxx

Go to the documentation of this file.

/*
 * Copyright (c) 2001-2004 MUSIC TECHNOLOGY GROUP (MTG)
 *                         UNIVERSITAT POMPEU FABRA
 *
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */
#ifndef XercesDomReader_hxx
#define XercesDomReader_hxx

#include "XercesEncodings.hxx"
#include "XercesInitializer.hxx"
#include "XmlStorageErr.hxx"

#include <xercesc/parsers/XercesDOMParser.hpp>
#include <xercesc/framework/MemBufInputSource.hpp>
#include <xercesc/sax/HandlerBase.hpp>
#include <string>
#include <list>
#include <sstream>
#include "Assert.hxx"

namespace xercesc = XERCES_CPP_NAMESPACE;

namespace CLAM
{

class XercesDomReader : private xercesc::HandlerBase
{
        xercesc::XercesDOMParser * parser;
        public:
                XercesDomReader()
                {
                        // This should be done in the read method itself when the xerces but is solved
                        XercesInitializer::require();
                        parser = new xercesc::XercesDOMParser();
                }
                ~XercesDomReader()
                {
                        // TODO: This is a hack for xerces bug on adoptNode, parser should be local variable
                        if (parser)
                                delete parser;
                }
                // TODO: This is a hack parser should be local variable
                xercesc::XercesDOMParser * adoptParser()
                {
                        xercesc::XercesDOMParser * temp = parser;
                        parser = 0;
                        return temp;
                }
                xercesc::DOMDocument * read(std::istream & target)
                {
                        if (target.fail()) throw XmlStorageErr("Unable to open the document source");
                        parser->setErrorHandler(this);
                        parser->setValidationScheme(xercesc::XercesDOMParser::Val_Auto);
                        parser->setValidationSchemaFullChecking(true);
                        parser->setDoNamespaces(true);
                        parser->setDoSchema(true);
                        parser->setCreateEntityReferenceNodes(true);

                        std::ostringstream stream;
                        char c;
                        while (true)
                        {
                                target.get(c);
                                if(!target.good()) break;
                                stream.put(c);
                        }
                        std::string temp = stream.str();
                        unsigned length = temp.length();
                        const char * documentText = temp.c_str();
                        xercesc::MemBufInputSource xercesInputSource (
                                (const XMLByte*)documentText
                                , length
                                , "CLAMParser"
                                , false
                                );

                        xercesInputSource.setCopyBufToStream(false);

                        parser->parse(xercesInputSource);

                        if (parser->getErrorCount())
                                throw XmlStorageErr(
                                        (std::string("\nXML Parser Errors:\n")+
                                         RecopilaErrors()).c_str());
                        xercesc::DOMDocument *doc = parser->getDocument();
                        CLAM_ASSERT(doc,"No errors but document not loaded!");
                        return doc;
                }
        private:
                typedef std::list<std::string> Missatges;
                Missatges _errors;
                void error(const xercesc::SAXParseException& e)
                {
                        report("Error", e);
                }

                void fatalError(const xercesc::SAXParseException& e)
                {
                        report("Fatal Error", e);
                }

                void warning(const xercesc::SAXParseException& e)
                {
                        report("Warning", e);
                }

                void report(const std::string & level, const xercesc::SAXParseException& e)
                {
                        std::ostringstream stream;
                        stream << level << " at file " << L(e.getSystemId())
                                << ", line " << e.getLineNumber()
                                << ", col " << e.getColumnNumber()
                                << ":\n" << L(e.getMessage());
                        _errors.push_back(stream.str());
                }
        public:
                std::string RecopilaErrors()
                {
                        std::string result;
                        Missatges::iterator it = _errors.begin();
                        for (; it!=_errors.end(); it++)
                                result += *it + "\n";
                        return result;
                }
};



}
#endif//XercesDomReader_hxx