Path.h

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//
// Copyright (c) 2009, Markus Rickert
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
//   this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright notice,
//   this list of conditions and the following disclaimer in the documentation
//   and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
//
 
#ifndef _RL_XML_PATH_H_
#define _RL_XML_PATH_H_
 
#include <string>
#include <boost/shared_array.hpp>
#include <boost/shared_ptr.hpp>
#include <libxml/xpath.h>
 
#include "Document.h"
#include "Node.h"
#include "Object.h"
 
namespace rl
{
    namespace xml
    {
        class Path
        {
        public:
            Path(const Document& doc) :
                context(xmlXPathNewContext(doc()), xmlXPathFreeContext),
                doc(doc())
            {
            }
            
            virtual ~Path()
            {
            }
            
            Object eval(const ::std::string& expression)
            {
                this->context->node = NULL;
                
                return Object(
                    xmlXPathEvalExpression(
                        reinterpret_cast< const xmlChar* >(expression.c_str()),
                        this->context.get()
                    )
                );
            }
            
            Object eval(const ::std::string& expression, const Node& node)
            {
                this->context->node = node();
                
                return Object(
                    xmlXPathEvalExpression(
                        reinterpret_cast< const xmlChar* >(expression.c_str()),
                        this->context.get()
                    )
                );
            }
            
            xmlXPathContextPtr operator()() const
            {
                return this->context.get();
            }
            
        protected:
            
        private:
            ::boost::shared_ptr< xmlXPathContext > context;
            
            xmlDocPtr doc;
        };
    }
}
 
#endif // _RL_XML_PATH_H_