nxmldocument.h

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// 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
//
#ifndef NXMLDOCUMENT_H
#define NXMLDOCUMENT_H

#include <libxml/tree.h>
#include <libxml/parser.h>
#include <libxml/xpath.h>
#include <libxml/xpathInternals.h>

#include "ndefs.h"
#include "nobject.h"
#include "nexception.h"
#include "nxmlnode.h"
#include "ndebug.h"
#include "nxmlerror.h"


class DllDeclSpec NXmlDocument: public NObject {
      friend class NXmlReader;
      friend class NXmlWriter;
      
      public:
            NXmlDocument(const NString &rootElement);

            ~NXmlDocument(void);
            
            void setRootNode(const NXmlNode &root);
            NXmlNode getRootNode(void);
            const NXmlNode constGetRootNode(void) const;
            
            NXmlNode findNode(const NString &name);

            const NXmlNode constFindNode(const NString &name) const;

            NXmlNode next(void);

            const NXmlNode constNext(void) const;
            
            NXmlNode previous(void);

            const NXmlNode constPrevious(void) const;
            
            void setEncoding(const NString &encoding);

            NString getEncoding(void) const;
            
      private:
            xmlDocPtr m_doc;
            NXmlNode m_root;
            
            
            mutable xmlXPathContextPtr m_xpath_ctxt;
            mutable xmlXPathObjectPtr m_xpath_obj;
            mutable nint32 m_pos;
            
            void init(void);
            
            void freeSearchResources(void) const;
            void createSearchResources(const NString &expr) const;
            
            // This constructor is used by NXmlReader class which needs to
            // instantiate a NXmlDocument object without a particular 
            // rootElement thus making itself the initialization of the 
            // object
            NXmlDocument(void);
            
            // Methods used by NXmlReader to initialize this class
            void setXmlDoc(xmlDocPtr doc);
            
            
            // This method is used by friend classes to obtain the
            // xmlDocPtr structure that this class abstracts
            xmlDocPtr getXmlDoc(void);
            
            // This methods are not implemented
            NXmlDocument(const NXmlDocument &other);
            NXmlDocument &operator=(const NXmlDocument &other);
            
};

#endif // NXMLDOCUMENT_H

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