singlefilter.hpp

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#ifndef _Wolframe_SINGLE_FILTER_HPP_INCLUDED
#define _Wolframe_SINGLE_FILTER_HPP_INCLUDED
#include "filter/typedfilter.hpp"

namespace _Wolframe {
namespace langbind {

class SingleElementInputFilter :public TypedInputFilter
{
public:
        explicit SingleElementInputFilter( const types::VariantConst& e)
                :TypedInputFilter("single")
                ,m_element(e)
                ,m_consumed(false){}

        SingleElementInputFilter( const SingleElementInputFilter& o)
                :TypedInputFilter(o)
                ,m_element(o.m_element)
                ,m_consumed(o.m_consumed){}

        virtual ~SingleElementInputFilter(){}

        virtual SingleElementInputFilter* copy() const
        {
                return new SingleElementInputFilter(*this);
        }

        virtual bool getNext( ElementType& type, types::VariantConst& element)
        {
                if (m_consumed)
                {
                        return false;
                }
                else
                {
                        type = TypedInputFilter::Value;
                        element = m_element;
                        return m_consumed=true;
                }
        }

private:
        types::VariantConst m_element;
        bool m_consumed;
};

}}//namespace
#endif