filter.hpp

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#ifndef _Wolframe_FILTER_FILTER_INTERFACE_HPP_INCLUDED
#define _Wolframe_FILTER_FILTER_INTERFACE_HPP_INCLUDED
#include "filter/inputfilter.hpp"
#include "filter/outputfilter.hpp"
#include <string>
#include <vector>
#include <utility>
#include <boost/shared_ptr.hpp>

namespace _Wolframe {
namespace langbind {

class Filter
{
public:
        Filter( const InputFilterR& i_, const OutputFilterR& o_)
                :m_inputfilter(i_),m_outputfilter(o_)
        {
                if (i_.get())
                {
                        m_outputfilter->inheritMetaData( m_inputfilter->getMetaDataRef());
                }
        }
        Filter( const Filter& o)
                :m_inputfilter(o.m_inputfilter),m_outputfilter(o.m_outputfilter){}
        Filter(){}

        const InputFilterR& inputfilter() const         {return m_inputfilter;}
        const OutputFilterR& outputfilter() const       {return m_outputfilter;}
        InputFilterR& inputfilter()                     {return m_inputfilter;}
        OutputFilterR& outputfilter()                   {return m_outputfilter;}

        bool getValue( const char* name, std::string& val) const
        {
                if (m_inputfilter.get() && m_inputfilter->getValue( name, val)) return true;
                if (m_outputfilter.get() && m_outputfilter->getValue( name, val)) return true;
                return false;
        }

        bool setValue( const char* name, const std::string& value)
        {
                bool rt = false;
                if (m_inputfilter.get() && m_inputfilter->setValue( name, value)) rt = true;
                if (m_outputfilter.get() && m_outputfilter->setValue( name, value)) rt = true;
                return rt;
        }

protected:
        InputFilterR m_inputfilter;
        OutputFilterR m_outputfilter;
};

typedef boost::shared_ptr<Filter> FilterR;


typedef std::pair<std::string,std::string> FilterArgument;

class FilterType
{
public:
        explicit FilterType( const char* name_)
                :m_name(name_){}
        FilterType( const FilterType& o)
                :m_name(o.m_name){}

        virtual ~FilterType(){}
        virtual Filter* create( const std::vector<FilterArgument>& arg = std::vector<FilterArgument>()) const=0;

        const char* name() const
                {return m_name;}
private:
        const char* m_name;
};

typedef boost::shared_ptr<FilterType> FilterTypeR;

typedef FilterType* (*CreateFilterType)();

}}//namespace
#endif