nxmlreader.cpp

// LICENSE: (Please see the file COPYING for details)
//
// NUS - Nemesis Utilities System: A C++ application development framework 
// Copyright (C) 2006, 2008 Otavio Rodolfo Piske
//
//  This file is part of NUS
//
//  This library is free software; you can redistribute it and/or
//  modify it under the terms of the GNU Lesser General Public
//  License as published by the Free Software Foundation version 2.1
//  of the License.
//
//  This library 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
//  Lesser General Public License for more details.
//
//  You should have received a copy of the GNU Lesser General Public
//  License along with this library; if not, write to the Free Software
//  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
//
#include "nxmlreader.h"

NXmlReader::NXmlReader(void)
      : m_reader(NULL),
      m_doc(NULL),
      m_xml_doc(NULL),
      m_schema(NXmlAbstractParser::XMLNOPARSING),
      m_parser(NULL),
      m_url(),
      m_encoding()
{

}


NXmlReader::~NXmlReader(void) {
      if (m_parser) { 
            delete m_parser;
      }
}

const char *NXmlReader::evalEncoding(const NString &encoding) { 
      if (encoding == "") { 
            return NULL;
      }
      
      return encoding.toChar();
}


void NXmlReader::setupRootElement(void) { 
      NXmlNode node(xmlDocGetRootElement(m_doc));
      
      m_xml_doc->setRootNode(node);
}


void NXmlReader::setSchema(NXmlAbstractParser::XmlSchema schema) {
      m_schema = schema;
}


NXmlAbstractParser::XmlSchema NXmlReader::getSchema(void) const {
      return m_schema;
}


void NXmlReader::setEncoding(const NString &encoding) { 
      m_encoding = encoding;
}


NString NXmlReader::getEncoding(void) const {
      return m_encoding;
}

void NXmlReader::setDefinitionUrl(const NString &url) {
      m_url = url;
}


NString NXmlReader::getDefinitionUrl(void) const {
      return m_url;
}


NXmlDocument *NXmlReader::getDocument(void) { 
      return m_xml_doc;
}


void NXmlReader::initDocument(void) { 
      m_xml_doc = new NXmlDocument;
      m_xml_doc->setXmlDoc(m_doc);
      
      setupRootElement();
}


void NXmlReader::load(const NString &path) {
      switch (m_schema) { 
            case NXmlAbstractParser::XMLDTD: { 
                  m_parser = new NXmlParser;
                  m_doc = m_parser->parse(path);
                  
                  break;
                  
            }
            case NXmlAbstractParser::XMLSCHEMA: {
                  m_parser = new NXmlSchemaParser;
                  
                  m_parser->setDefinitionUrl(m_url);
                  m_doc = m_parser->parse(path);
                  break;
            }
            
            case NXmlAbstractParser::XMLNOPARSING:
            default: { 
                  loadNoParse(path);
                  break;
            }
      }
            
      initDocument();
}


void NXmlReader::loadNoParse(const NString &path) { 
      m_reader = xmlReaderForFile(path.toChar(), 
                            evalEncoding(m_encoding), 0);
            
      if (!m_reader) { 
            throw NXmlError::getLastError(NSTR("Unable to read from file ")
                        + path, NXmlException::XML_INIT_ERROR);
      }
      
      xmlTextReaderRead(m_reader);
      m_doc = xmlTextReaderCurrentDoc(m_reader);
      
      if (!m_doc) { 
            throw NXmlError::getLastError("Unable to create a xml doc object",
                  NXmlException::XML_INIT_ERROR);
      }
}


void NXmlReader::load(const NString &buffer, nint32 size) {
      switch (m_schema) { 
            case NXmlAbstractParser::XMLDTD: { 
                  m_parser = new NXmlParser;
                  m_doc = m_parser->parse(buffer, m_url);
                  
                  break;
            }
            case NXmlAbstractParser::XMLSCHEMA: {
                  m_parser = new NXmlSchemaParser;
                  
                  m_parser->setDefinitionUrl(m_url);
                  m_doc = m_parser->parse(buffer, m_url);
                  
                  break;
            }
            
            case NXmlAbstractParser::XMLNOPARSING:
            default: { 
                  loadNoParse(buffer, size);
                  break;
            }
      }
      
      initDocument();
}


void NXmlReader::loadNoParse(const NString &buffer, nint32 size) {
      if (buffer == "") { 
            NDebug::print() << "The buffer to parse is empty";
      }
      
      m_reader = xmlReaderForMemory(buffer.toChar(), size, m_url.toChar(),
                              evalEncoding(m_encoding), 0);
      
      xmlTextReaderRead(m_reader);
      
      m_doc = xmlTextReaderCurrentDoc(m_reader);
      
      if (!m_doc) { 
            throw NXmlError::getLastError("Unable to create a xml doc object",
                        NXmlException::XML_INIT_ERROR);
      }
}


void NXmlReader::load(const NFile *file) {
      switch (m_schema) { 
            case NXmlAbstractParser::XMLDTD: { 
                  m_parser = new NXmlParser;
                  m_doc = m_parser->parse(file, m_url);
                  break;
            }
            case NXmlAbstractParser::XMLSCHEMA: {
                  m_parser = new NXmlSchemaParser;
                  
                  m_parser->setDefinitionUrl(m_url);
                  m_doc = m_parser->parse(file, m_url);
                  break;
            }
            
            case NXmlAbstractParser::XMLNOPARSING:
            default: { 
                  loadNoParse(file);
                  break;
            }
      }
      
      initDocument();
} 



void NXmlReader::loadNoParse(const NFile *file) { 
      if (!file) { 
            throw NXmlException("Invalid 'file' object: null object", 
                        NException::XML, NXmlException::XML_INIT_ERROR);
      }
      
      m_reader = xmlReaderForFd(file->handle(), m_url.toChar(), 
                          evalEncoding(m_encoding), 0);
      
      if (!m_reader) { 
            throw NXmlError::getLastError("Unable to read from file handle",
                  NXmlException::XML_INIT_ERROR);
      }
      
      xmlTextReaderRead(m_reader);
      
      m_doc = xmlTextReaderCurrentDoc(m_reader);
      
      if (!m_doc) { 
            throw NXmlError::getLastError("Unable to create a xml doc object", 
                  NXmlException::XML_INIT_ERROR);
      }
}

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