Node.h

/*
 * Copyright (C) 2006-2012 by Marc Boris Duerner
 *
 * 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; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * As a special exception, you may use this file as part of a free
 * software library without restriction. Specifically, if other files
 * instantiate templates or use macros or inline functions from this
 * file, or you compile this file and link it with other files to
 * produce an executable, this file does not by itself cause the
 * resulting executable to be covered by the GNU General Public
 * License. This exception does not however invalidate any other
 * reasons why the executable file might be covered by the GNU Library
 * General Public 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 Pt_Xml_Node_h
#define Pt_Xml_Node_h
 
#include <Pt/Xml/Api.h>
#include <Pt/Xml/XmlError.h>
 
namespace Pt {
 
namespace Xml {

class Node 
{
    public:
        enum Type 
        {
            Unknown = 0,
            DocType = 1,
            EndDocType = 2,
            StartDocument = 3,
            EndDocument = 4,
            StartElement = 5,
            EndElement = 6,
            Characters = 7,
            Comment = 8,
            ProcessingInstruction = 9,
            EntityReference = 10
        };

        virtual ~Node()
        {}

        Type type() const
        { return _type; }
 
    protected:
        explicit Node(Type type)
        : _type(type)
        { }
 
    private:
        Type _type;
};

template <typename T>
T* nodeCast(Node* node)
{
    T* e = 0;
        
    if( node->type() == T::nodeId() )
        e = static_cast<T*>(node);
 
    return e;
}

template <typename T>
const T* nodeCast(const Node* node)
{
    const T* e = 0;
        
    if( node->type() == T::nodeId() )
        e = static_cast<const T*>(node);
 
    return e;
}

template <typename T>
T& nodeCast(Node& node)
{
    if( node.type() != T::nodeId() )
        throw XmlError("unexpected node type");
 
    return static_cast<T&>(node);
}

template <typename T>
const T& nodeCast(const Node& node)
{
    if( node.type() != T::nodeId() )
        throw XmlError("unexpected node type");
 
    return static_cast<const T&>(node);
}
 
} // namespace Xml
 
} // namespace Pt
 
#endif // Pt_Xml_Node_h