dp_node_dmri_xps_from_json.m

classdef dp_node_dmri_xps_from_json < dp_node

    % builds an xps from the json file information
    %
    % overwrites an existing xps, if a status file does not exist
    % this if a bit awkward, but allow us to overwrite the xps
    % without duplicating the nii file

    % as input, we need
    % input.dmri_fn (but we assume we also have associated .json file)
    
    % needs code from Filip's fwf resources

    methods

        function obj = dp_node_dmri_xps_from_json()
            obj.output_test = {'xps_fn', 'status_file_fn'};
        end

        function output = i2o(obj, input)

            output.dmri_fn = input.dmri_fn;
            output.xps_fn  = mdm_xps_fn_from_nii_fn(output.dmri_fn);

            [~,name] = msf_fileparts(input.dmri_fn);
            output.status_file_fn = fullfile(input.op, [name '_xps_status.txt']);

        end

        function output = execute(obj, input, output)

            % Create xps from json
            xps = fwf_xps_from_siemens_json(input.dmri_fn);

            % Test it
            I = mdm_nii_read(input.dmri_fn);

            if (size(I,4) ~= xps.n)
                error('Sizes of xps and nii does not match (%i vs %i)', ...
                    xps.n, size(I,4));
            end
            

            mdm_xps_save(xps, output.xps_fn);

            msf_mkdir(fileparts(output.status_file_fn));
            mdm_txt_write({'done'}, output.status_file_fn);

        end

    end
end