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## Copyright (C) 2013-2022 Alexander Barth
##
## This program is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 3 of the License, or
## (at your option) any later version.
##
## This program is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
## GNU General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with this program; If not, see <http://www.gnu.org/licenses/>.
## -*- texinfo -*-
## @deftypefn {Function File} {} ncwriteschema (@var{filename}, @var{schema})
##
## Create a NetCDF called @var{filename} with the dimensions, attributes,
## variables and groups given by the structure @var{schema}.
##
## The variable @var{schema} has the same structure as the results of
## @code{ncinfo}. @code{ncinfo} and @code{ncwriteschema} can be used together to
## create a NetCDF using another file as a template:
##
## @subsubheading Example
## @example
## schema = ncinfo("template.nc");
## # the new file should be named "new_file.nc"
## ncwriteschema("new_file.nc",schema);
## @end example
##
## Unused field in @var{schema} such as @var{ChunkSize}, @var{Shuffle},
## @var{DeflateLevel}, @var{FillValue}, @var{Checksum} can be left-out if the
## corresponding feature is not used.
##
## Dimensions are considered as limited if the field @var{Unlimited} is missing,
## unless the dimension length is Inf.
##
## @seealso{ncinfo}
##
## @end deftypefn
function ncwriteschema (filename, s)
mode = format2mode(s.Format);
ncid = netcdf_create(filename,mode);
write_group(ncid,s)
netcdf_close(ncid);
endfunction
function write_group(ncid,s)
% normalize schema
if ~isfield(s,'Dimensions')
s.Dimensions = [];
endif
if isempty(s.Dimensions)
s.Dimensions = struct('Name',{},'Length',{},'Unlimited',{});
endif
if ~isfield(s,'Attributes')
s.Attributes = struct('Name',{},'Value',{});
endif
if ~isfield(s,'Variables')
s.Variables = struct('Name',{},'Dimensions',{},'Datatype',{});;
endif
% dimension
for i = 1:length(s.Dimensions)
dim = s.Dimensions(i);
if ~isfield(dim,'Unlimited')
dim.Unlimited = false;
endif
len = dim.Length;
if dim.Unlimited || isinf(len)
len = netcdf_getConstant('NC_UNLIMITED');
endif
s.Dimensions(i).id = netcdf_defDim(ncid,dim.Name,len);
endfor
% global attributes
gid = netcdf_getConstant('NC_GLOBAL');
for j = 1:length(s.Attributes)
netcdf_putAtt(ncid,gid,s.Attributes(j).Name,s.Attributes(j).Value);
endfor
% variables
for i = 1:length(s.Variables)
v = s.Variables(i);
%v.Name
% get dimension id
dimids = zeros(length(v.Dimensions),1);
for j = 1:length(v.Dimensions)
dimids(j) = netcdf_inqDimID(ncid,v.Dimensions(j).Name);
endfor
% define variable
dtype = oct2nctype(v.Datatype);
varid = netcdf_defVar(ncid,v.Name,dtype,dimids);
% define attributes
for j = 1:length(v.Attributes)
netcdf_putAtt(ncid,varid,v.Attributes(j).Name,v.Attributes(j).Value);
endfor
% define chunk size
if isfield(v,'ChunkSize')
if ~isempty(v.ChunkSize)
netcdf_defVarChunking(ncid,varid,'chunked',v.ChunkSize);
endif
endif
% define compression
shuffle = false;
deflatelevel = 0;
if isfield(v,'Shuffle')
if ~isempty(v.Shuffle)
shuffle = v.Shuffle;
endif
endif
if isfield(v,'DeflateLevel')
if ~isempty(v.DeflateLevel)
deflatelevel = v.DeflateLevel;
endif
endif
if shuffle && defaltelevel != 0
deflate = defaltelevel != 0;
netcdf_defVarDeflate(ncid,varid,shuffle,deflate,deflatelevel);
endif
% define fill value
if isfield(v,'FillValue')
if ~isempty(v.FillValue)
% leave nofill setting unchanged
[nofill,fillval] = netcdf_inqVarFill(ncid,varid);
netcdf_defVarFill(ncid,varid,nofill,v.FillValue);
endif
endif
% define checksum
if isfield(v,'Checksum')
if ~isempty(v.Checksum)
netcdf_defVarFletcher32(ncid,varid,v.Checksum);
endif
endif
endfor
% groups
if isfield(s,'Groups')
if ~isempty(s.Groups)
for i=1:length(s.Groups)
g = s.Groups(i);
gid = netcdf_defGrp(ncid,g.Name);
write_group(gid,g);
endfor
endif
endif
endfunction
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