opendap indices subscript

[Thomas LOUBRIEU]

Hi all,

I have a problem when I use the java netcdf API (in version 2.2.18 or 
2.2.19) for saving OPeNDAP request results as NetCDF files.

One example of OPeNDAP URL I use is :
http://www.ifremer.fr/thredds3/dodsC/CORIOLIS-GLOBAL-RTOA/sea_water_temperature/aggregated_time_serie?temperature[0:1][1:2][13:23][13:33] 


I first tried  with these lines of code :

     try {
           NetcdfDatasetCache.disable();
           ncfile = (NetcdfFile)NetcdfDataset.acquireDataset(filename, 
null);
           FileWriter.writeToFile(ncfile,
                   "/tmp/test.nc",
                   false,
                   0);                    } catch (IOException ioe) {
             System.out.println("trying to open " +  ioe.getMessage());
                   }
...

But the API is trying to download the full dataset by sending to the 
server a request like :
http://www.ifremer.fr/thredds3/dodsC/CORIOLIS-GLOBAL-RTOA/sea_water_temperature/aggregated_time_serie?temperature 


Of course the server cannot answer such a request because the volume for 
the dataset is about 20 Gb...

In order to avoid this, I've created an object in order to  set  to 
'false' the 'preload' static attribute  of the 'DODSNetcdfFile' object.

Now the API sends requests like :
http://www.ifremer.fr/thredds3/dodsC/CORIOLIS-GLOBAL-RTOA/sea_water_temperature/aggregated_time_serie?latitude[0:1:10] 

or
http://www.ifremer.fr/thredds3/dodsC/CORIOLIS-GLOBAL-RTOA/sea_water_temperature/aggregated_time_serie?temperature[0:1:1][0:1:1][0:1:10][0:1:20]
...
(as many as required variables)

It is quite right but the offsets of my array subscript disappear and 
become '0' for every request and every variable.

It seems that the problem happens in the 'readArrays' method of the 
'DODSNetcdfFile' object.

Does anyone already face this problem ? Is this a bug or a mis-use of 
the API ?

Thanks in advance for any piece of advice you could give me.

Thomas




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