MHO_SamplerLabeler.hh

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#ifndef MHO_SamplerLabeler_HH__
#define MHO_SamplerLabeler_HH__
 
#include <map>
#include <stack>
#include <string>
 
#include "MHO_Message.hh"
#include "MHO_Tokenizer.hh"
 
#include "MHO_ContainerDefinitions.hh"
#include "MHO_TableContainer.hh"
#include "MHO_UnaryOperator.hh"
 
namespace hops
{
 
template< typename XArrayType > class MHO_SamplerLabeler: public MHO_UnaryOperator< XArrayType >
{
    public:
        MHO_SamplerLabeler()
        {
            fComma = ",";
            fChannelLabelKey = "channel_label";
            fRefSamplerIndexKey = "ref_sampler_index";
            fRemSamplerIndexKey = "rem_sampler_index";
        };
 
        virtual ~MHO_SamplerLabeler(){};
 
        void SetReferenceStationSamplerChannelSets(const std::vector< std::string >& channel_sets)
        {
            fRefSamplerChanSets = channel_sets;
        }
 
        void SetRemoteStationSamplerChannelSets(const std::vector< std::string >& channel_sets)
        {
            fRemSamplerChanSets = channel_sets;
        }
 
    protected:
        virtual bool ExecuteInPlace(XArrayType* in) override
        {
            //map channel label (e.g. 'a', 'b', etc.) to sampler index for both reference and remote stations
            ConstructChannelToSamplerIDMap(fRefSamplerChanSets, fRefChanToSamplerID);
            ConstructChannelToSamplerIDMap(fRemSamplerChanSets, fRemChanToSamplerID);
 
            if(in != nullptr)
            {
                //need to retrieve the labels of each channel, then look up the
                //sampler delay index using the map, and then insert that key:value pair
                auto chan_axis_ptr = &(std::get< CHANNEL_AXIS >(*in));
                std::size_t nchans = chan_axis_ptr->GetSize();
 
                for(std::size_t ch = 0; ch < nchans; ch++)
                {
                    std::string chan_label = "";
                    chan_axis_ptr->RetrieveIndexLabelKeyValue(ch, fChannelLabelKey, chan_label);
                    //add sampler labels
                    if(fRefChanToSamplerID.find(chan_label) != fRefChanToSamplerID.end())
                    {
                        int ref_id = fRefChanToSamplerID[chan_label];
                        chan_axis_ptr->InsertIndexLabelKeyValue(ch, fRefSamplerIndexKey, ref_id);
                    }
                    if(fRemChanToSamplerID.find(chan_label) != fRemChanToSamplerID.end())
                    {
                        int rem_id = fRemChanToSamplerID[chan_label];
                        chan_axis_ptr->InsertIndexLabelKeyValue(ch, fRemSamplerIndexKey, rem_id);
                    }
                }
                return true;
            }
            return false;
        }
 
    private:
        //data maps channels to sampler
        std::vector< std::string > fRefSamplerChanSets;
        std::vector< std::string > fRemSamplerChanSets;
        std::map< std::string, int > fRefChanToSamplerID;
        std::map< std::string, int > fRemChanToSamplerID;
 
        std::string fComma;
        std::string fChannelLabelKey;
        std::string fRefSamplerIndexKey;
        std::string fRemSamplerIndexKey;
        MHO_Tokenizer fTokenizer;
 
        void ConstructChannelToSamplerIDMap(std::vector< std::string >& chan_set, std::map< std::string, int >& chan2id)
        {
            //figure out which sampler index each channel has been assigned to
            for(std::size_t sampler_id = 0; sampler_id < chan_set.size(); sampler_id++)
            {
                std::string chans = chan_set[sampler_id];
                std::vector< std::string > split_chans = SplitChannelLabels(chans);
                for(auto it = split_chans.begin(); it != split_chans.end(); it++)
                {
                    chan2id[*it] = (int)sampler_id;
                }
            }
        }
 
        std::vector< std::string > SplitChannelLabels(std::string channels)
        {
            std::vector< std::string > split_chans;
            //we have two possibilities, either channels are delimited by ',' or
            //they are all single-char labels that are smashed together into a single string
 
            if((channels.find(',') != std::string::npos))
            {
                //found a comma, need to use the tokenizer
                fTokenizer.SetDelimiter(fComma);
                fTokenizer.SetUseMulticharacterDelimiterFalse();
                fTokenizer.SetRemoveLeadingTrailingWhitespaceTrue();
                fTokenizer.SetIncludeEmptyTokensFalse();
                fTokenizer.SetString(&channels);
                fTokenizer.GetTokens(&split_chans);
            }
            else
            {
                //just split up the channels into individual characters
                for(std::size_t i = 0; i < channels.size(); i++)
                {
                    split_chans.push_back(std::string(1, channels[i]));
                }
            }
            return split_chans;
        }
};
 
} // namespace hops
 
#endif