joinfilter.hpp

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

namespace _Wolframe {
namespace langbind {

class JoinInputFilter
        :public TypedInputFilter
{
public:
        explicit JoinInputFilter( const char* name_, const TypedInputFilterR& f1, const TypedInputFilterR& f2)
                :TypedInputFilter(name_)
                ,m_inputfilter1(f1)
                ,m_inputfilter2(f2)
                ,m_joinstate(Init)
                ,m_taglevel(0)
        {
                TypedInputFilter::setFlags( f1->flags());
                TypedInputFilter::setFlags( f2->flags());
        }

        JoinInputFilter( const JoinInputFilter& o)
                :TypedInputFilter(o)
                ,m_inputfilter1(o.m_inputfilter1)
                ,m_inputfilter2(o.m_inputfilter2)
                ,m_joinstate(o.m_joinstate)
                ,m_taglevel(o.m_taglevel)
        {}

        virtual ~JoinInputFilter(){}

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

        virtual bool getNext( ElementType& type, types::VariantConst& element);

        virtual void resetIterator();

        virtual bool setFlags( Flags f);

        virtual bool checkSetFlags( Flags f) const;

        virtual const char* getError() const;

private:
        bool getNextImpl( TypedInputFilter* flt, ElementType& type, types::VariantConst& element);

        TypedInputFilterR m_inputfilter1;
        TypedInputFilterR m_inputfilter2;

        enum JoinState
        {
                Init,
                ProcessFilter1,
                ProcessFilter2,
                FinalClose,
                Done
        };
        JoinState m_joinstate;
        int m_taglevel;
};

}}//namespace
#endif