legacy/src/main/java/ucar/nc2/thredds/ThreddsDataFactory.java
public ThreddsDataFactory.Result openFeatureDataset(InvDataset invDataset, ucar.nc2.util.CancelTask task) throws IOException {
    return openFeatureDataset(null, invDataset, task, new Result());
  }
public ThreddsDataFactory.Result openFeatureDataset(InvDataset invDataset, ucar.nc2.util.CancelTask task) throws IOException {
    return openFeatureDataset(null, invDataset, task, new Result());
  }
Open a FeatureDataset from an InvDataset object, deciding on which InvAccess to use.

@param invDataset use this to figure out what type, how to open, etc
@param task       allow user to cancel; may be null
@return ThreddsDataFactory.Result check fatalError for validity
@throws IOException on read error