/// <summary>
///
/// </summary>
/// <param name="proposedChanges"></param>
internal protected override void OnPrecommit(Variable.Changes proposedChanges)
{
NetCDF.nc_enddef(NcId);
base.OnPrecommit(proposedChanges);
if (((NetCDFDataSet)DataSet).Initializing)
{
return;
}
NetCDF.nc_redef(NcId);
NetCDFDataSet dataSet = (NetCDFDataSet)this.DataSet;
AttributeTypeMap atm = new AttributeTypeMap(dataSet.NcId, varid);
/* Updating attributes in the netCDF file */
foreach (var item in proposedChanges.MetadataChanges)
{
dataSet.WriteNetCdfAttribute(varid, item.Key, item.Value, atm);
}
// NetCDF doesn't supports storing of arrays of kind A[x:0, y:10]
// so we keep this actual shape in the reserved attribute.
if (Rank > 1)
{
int min, max;
GetMinMax(proposedChanges.Shape, out min, out max);
if (min == 0 && max > 0)
{
dataSet.WriteNetCdfAttribute(varid, AttributeTypeMap.AttributeVarActualShape,
proposedChanges.Shape, atm);
isPresentedAttrActualShape = true;
}
else if (isPresentedAttrActualShape)
{
NetCDF.nc_del_att(NcId, varid, AttributeTypeMap.AttributeVarActualShape);
isPresentedAttrActualShape = false;
}
}
atm.Store();
/* Saving attached coordinate systems as "coordinates" attributes.
* Common netCDF model supports for only one such attribute,
* so all others CS except first are not compatible with that model.
* Their attribute names are "coordinates2","coordinates3" etc.
* Names of coordinate systems are provided with corresponed
* attributes "coordinatesName","coordinates2Name",...
*/
if (proposedChanges.CoordinateSystems != null)
{
int n = proposedChanges.InitialSchema.CoordinateSystems.Length;
foreach (var cs in proposedChanges.CoordinateSystems)
{
if (Array.Exists(proposedChanges.InitialSchema.CoordinateSystems, css => css == cs.Name))
{
continue;
}
// This CS has been added.
string name = "coordinates";
if (n > 0)
{
name += n.ToString();
}
n++;
StringBuilder sb = new StringBuilder();
bool first = true;
foreach (Variable axis in cs.Axes)
{
if (!first)
{
sb.Append(' ');
}
else
{
first = false;
}
sb.Append(axis.Name);
}
dataSet.WriteNetCdfAttribute(varid, name, sb.ToString(), null);
dataSet.WriteNetCdfAttribute(varid, name + "Name", cs.Name, null);
}
}
}