Attribute.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_ATTRIBUTE_H
#define RL_XML_ATTRIBUTE_H
 
#include <string>
#include <boost/shared_array.hpp>
#include <libxml/parser.h>
 
#include "Namespace.h"
 
namespace rl
{
    namespace xml
    {
        class Attribute
        {
        public:
            explicit Attribute(::xmlAttrPtr attr) :
                attr(attr)
            {
            }
            
            Attribute(::xmlNodePtr node, const ::std::string& name, const ::std::string& value) :
                attr(
                    ::xmlNewProp(
                        node,
                        reinterpret_cast<const ::xmlChar*>(name.c_str()),
                        reinterpret_cast<const ::xmlChar*>(value.c_str())
                    )
                )
            {
            }
            
            Attribute(::xmlNodePtr node, const Namespace& nameSpace, const ::std::string& name, const ::std::string& value) :
                attr(
                    ::xmlNewNsProp(
                        node,
                        nameSpace.get(),
                        reinterpret_cast<const ::xmlChar*>(name.c_str()),
                        reinterpret_cast<const ::xmlChar*>(value.c_str())
                    )
                )
            {
            }
            
            ~Attribute()
            {
                if (nullptr != this->attr && nullptr == this->attr->doc)
                {
                    ::xmlFreeProp(this->attr);
                }
            }
            
            ::xmlAttrPtr get() const
            {
                return this->attr;
            }
            
            ::std::string getName() const
            {
                return nullptr != this->attr->name ? reinterpret_cast<const char*>(this->attr->name) : ::std::string(); 
            }
            
            Attribute getNext() const
            {
                return Attribute(this->attr->next);
            }
            
            Attribute getPrevious() const
            {
                return Attribute(this->attr->prev);
            }
            
            ::std::string getValue() const
            {
                if (nullptr != this->attr->ns)
                {
                    ::boost::shared_array< ::xmlChar> value(
                        ::xmlGetNsProp(
                            this->attr->parent,
                            this->attr->name,
                            this->attr->ns->href
                        ),
                        ::xmlFree
                    );
                    
                    return nullptr != value.get() ? reinterpret_cast<char*>(value.get()) : ::std::string();
                }
                else
                {
                    ::boost::shared_array< ::xmlChar> value(
                        ::xmlGetProp(
                            this->attr->parent,
                            this->attr->name
                        ),
                        ::xmlFree
                    );
                    
                    return nullptr != value.get() ? reinterpret_cast<char*>(value.get()) : ::std::string();
                }
            }
            
            ::xmlAttr& operator*() const
            {
                return *this->attr;
            }
            
            void remove()
            {
                xmlRemoveProp(this->attr);
            }
            
            void setValue(const ::std::string& value)
            {
                if (nullptr != this->attr->ns)
                {
                    ::xmlSetNsProp(
                        this->attr->parent,
                        this->attr->ns,
                        this->attr->name,
                        reinterpret_cast<const ::xmlChar*>(value.c_str())
                    );
                }
                else
                {
                    ::xmlSetProp(
                        this->attr->parent,
                        this->attr->name,
                        reinterpret_cast<const ::xmlChar*>(value.c_str())
                    );
                }
            }
            
        protected:
            
        private:
            ::xmlAttrPtr attr;
        };
    }
}
 
#endif // RL_XML_ATTRIBUTE_H