SequenceTypeInfoBase.hpp

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/***************************************************************************
  tag: The SourceWorks  Tue Sep 7 00:55:18 CEST 2010  SequenceTypeInfo.hpp

                        SequenceTypeInfo.hpp -  description
                           -------------------
    begin                : Tue September 07 2010
    copyright            : (C) 2010 The SourceWorks
    email                : peter@thesourceworks.com

 ***************************************************************************
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#ifndef ORO_SEQUENCE_TYPE_INFO_BASE_HPP
#define ORO_SEQUENCE_TYPE_INFO_BASE_HPP

#include "SequenceConstructor.hpp"
#include "TemplateConstructor.hpp"
#include "PropertyComposition.hpp"
#include "VectorTemplateComposition.hpp"
#include "PropertyDecomposition.hpp"
#include "../internal/FusedFunctorDataSource.hpp"
#include "../internal/DataSourceGenerator.hpp"
#include <boost/lexical_cast.hpp>

namespace RTT
{
    namespace types
    {
        template<class T>
        int get_capacity(T const& cont)
        {
            return cont.capacity();
        }

        template<class T>
        int get_size(T const& cont)
        {
            return cont.size();
        }

        template<class T>
        typename T::reference get_container_item(T & cont, int index)
        {
            if (index >= (int) (cont.size()) || index < 0)
                return internal::NA<typename T::reference>::na();
            return cont[index];
        }

        template<class T>
        typename T::value_type get_container_item_copy(const T & cont, int index)
        {
            if (index >= (int) (cont.size()) || index < 0)
                return internal::NA<typename T::value_type>::na();
            return cont[index];
        }

        bool get_container_item(std::vector<bool> & cont, int index);
        bool get_container_item_copy(const std::vector<bool> & cont, int index);

        template<typename T>
        class SequenceTypeInfoBase
        {
        public:
            SequenceTypeInfoBase()
            {
            }

            bool installTypeInfoObject(TypeInfo* ti) {
                ti->addConstructor( new SequenceBuilder<T>() );
                ti->addConstructor( newConstructor( sequence_ctor<T>() ) );
                ti->addConstructor( newConstructor( sequence_ctor2<T>() ) );
                // Don't delete us, we're memory-managed.
                return false;
            }

            ~SequenceTypeInfoBase() {}

            base::AttributeBase* buildVariable(std::string name,int size) const
            {
                // if a sizehint is given
                T t_init(size, typename T::value_type() );

                return new Attribute<T>( name, new internal::UnboundDataSource<internal::ValueDataSource<T> >( t_init ) );
            }

            bool resize(base::DataSourceBase::shared_ptr arg, int size) const
            {
                if (arg->isAssignable()) {
                    typename internal::AssignableDataSource<T>::shared_ptr asarg = internal::AssignableDataSource<T>::narrow( arg.get() );
                    asarg->set().resize( size );
                    asarg->updated();
                    return true;
                }
                return false;
            }

            bool composeType( base::DataSourceBase::shared_ptr dssource, base::DataSourceBase::shared_ptr dsresult) const {
                const internal::DataSource<PropertyBag>* pb = dynamic_cast< const internal::DataSource<PropertyBag>* > (dssource.get() );
                if ( !pb )
                    return false;
                typename internal::AssignableDataSource<T>::shared_ptr ads = boost::dynamic_pointer_cast< internal::AssignableDataSource<T> >( dsresult );
                if ( !ads )
                    return false;

                PropertyBag const& source = pb->rvalue();
                typename internal::AssignableDataSource<T>::reference_t result = ads->set();

                // recurse into items of this sequence:
                PropertyBag target( source.getType() );
                // we compose each item in this sequence and then update result with target's result.
                // 1. each child is composed into target (this is a recursive thing using composeType() on each child)
                // 2. we decompose result one-level deep and 
                // 3. 'refresh' it with the composed children of step 1.
                if ( composePropertyBag(source, target) && composeTemplateProperty(target, result ) ){
                    ads->updated();
                    Logger::log() <<Logger::Debug<<"Successfuly composed Sequence from "<< source.getType() <<Logger::endl;
                    return true;
                } else 
                    Logger::log() <<Logger::Debug<<"Failed to composed Sequence from "<< source.getType() <<Logger::endl;

                return false;
            }

            base::DataSourceBase::shared_ptr decomposeType(base::DataSourceBase::shared_ptr source) const
            {
                return base::DataSourceBase::shared_ptr();
            }


            std::vector<std::string> getMemberNames() const {
                // only discover the parts of this struct:
                std::vector<std::string> result;
                result.push_back("size");
                result.push_back("capacity");
                return result;
            }

            base::DataSourceBase::shared_ptr getMember(base::DataSourceBase::shared_ptr item, const std::string& name) const {
                // the only thing we do is to check for an integer in name, otherwise, assume a part (size/capacity) is accessed:
                try {
                    unsigned int indx = boost::lexical_cast<unsigned int>(name);
                    // @todo could also return a direct reference to item indx using another DS type that respects updated().
                    return getMember( item, new internal::ConstantDataSource<int>(indx));
                } catch(...) {}

                return getMember( item, new internal::ConstantDataSource<std::string>(name) );
            }

            base::DataSourceBase::shared_ptr getMember(base::DataSourceBase::shared_ptr item,
                                                             base::DataSourceBase::shared_ptr id) const {
                // discover if user gave us a part name or index:
                typename internal::DataSource<int>::shared_ptr id_indx = internal::DataSource<int>::narrow( internal::DataSourceTypeInfo<int>::getTypeInfo()->convert(id).get() );
                typename internal::DataSource<std::string>::shared_ptr id_name = internal::DataSource<std::string>::narrow( id.get() );
                if ( id_name ) {
                    if ( id_name->get() == "size" ) {
                        try {
                            return internal::newFunctorDataSource(&get_size<T>, internal::GenerateDataSource()(item.get()) );
                        } catch(...) {}
                    }
                    if ( id_name->get() == "capacity" ) {
                        try {
                            return internal::newFunctorDataSource(&get_capacity<T>, internal::GenerateDataSource()(item.get()) );
                        } catch(...) {}
                    }
                }

                if ( id_indx ) {
                    try {
                        if ( item->isAssignable() )
                                return internal::newFunctorDataSource(&get_container_item<T>, internal::GenerateDataSource()(item.get(), id_indx.get() ) );
                            else
                                return internal::newFunctorDataSource(&get_container_item_copy<T>, internal::GenerateDataSource()(item.get(), id_indx.get() ) );
                    } catch(...) {}
                }
                if (id_name) {
                    log(Error) << "SequenceTypeInfo: No such member : " << id_name->get() << endlog();
                }
                if (id_indx) {
                    log(Error) << "SequenceTypeInfo: Invalid index : " << id_indx->get() <<":"<< id_indx->getTypeName() << endlog();
                }
                if ( !id_name && ! id_indx)
                    log(Error) << "SequenceTypeInfo: Not a member or index : " << id <<":"<< id->getTypeName() << endlog();
                return base::DataSourceBase::shared_ptr();
            }
        };
    }
}

#endif