function hdf_fielddata = ReadHDF5FieldData(file)
% function hdf_fielddata = ReadHDF5FieldData(file)
%
% returns:
% hdf_fielddata.time
% hdf_fielddata.names
% hdf_fielddata.values
%
% example: values of timestep 12:
% hdf_fielddata.values{12}: array (x,y,z,polarization)
%
% plot z-field component along y-direction for timestep 12:
% plot( hdf_fielddata.values{12}(1,:,1,3) )
%
% openEMS matlab interface
% -----------------------
% author: Thorsten Liebig
%
% See also ReadHDF5Mesh ReadHDF5Dump

isOctave = exist('OCTAVE_VERSION','builtin') ~= 0;
if isOctave
    hdf_fielddata = ReadHDF5FieldData_octave(file);
    return
end

info = hdf5info(file);

for n=1:numel(info.GroupHierarchy.Groups)
    if strcmp(info.GroupHierarchy.Groups(n).Name,'/FieldData')
        for m=1:numel(info.GroupHierarchy.Groups(n).Datasets)
            names{m} = info.GroupHierarchy.Groups(n).Datasets(m).Name;
            hdf_fielddata.time(m) = double(info.GroupHierarchy.Groups(n).Datasets(m).Attributes.Value);
        end
    end
end

hdf_fielddata.names = names;
for n=1:numel(names)
    hdf_fielddata.values{n} = double(hdf5read(file,names{n}));
end



function hdf_fielddata = ReadHDF5FieldData_octave(file)
hdf = load( '-hdf5', file );
hdf_fielddata.names = fieldnames(hdf.FieldData);
for n=1:numel(hdf_fielddata.names)
    hdf_fielddata.time(n) = str2double(hdf_fielddata.names{n}(2:end));
    hdf_fielddata.values{n} = hdf.FieldData.(hdf_fielddata.names{n});
end