/*
* Copyright 1998-2009 University Corporation for Atmospheric Research/Unidata
*
* Portions of this software were developed by the Unidata Program at the
* University Corporation for Atmospheric Research.
*
* Access and use of this software shall impose the following obligations
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* any fee or cost, to use, copy, modify, alter, enhance and distribute
* this software, and any derivative works thereof, and its supporting
* documentation for any purpose whatsoever, provided that this entire
* notice appears in all copies of the software, derivative works and
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*
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*/
package ucar.nc2.ncml;
import ucar.nc2.dataset.NetcdfDataset;
import ucar.nc2.dataset.DatasetConstructor;
import ucar.nc2.util.CancelTask;
import ucar.nc2.NetcdfFile;
import java.io.IOException;
import java.util.List;
import java.util.ArrayList;
/**
* Aggregation on datasets to be simply combined - aka "union".
*
* The variables are transferred from the component files to the ncml dataset
*
* @author caron
*/
public class AggregationUnion extends Aggregation {
private List<NetcdfFile> openDatasets = new ArrayList<NetcdfFile>();
public AggregationUnion(NetcdfDataset ncd, String dimName, String recheckS) {
super(ncd, dimName, Aggregation.Type.union, recheckS);
}
@Override
protected void buildNetcdfDataset(CancelTask cancelTask) throws IOException {
// each Dataset just gets "transfered" into the resulting NetcdfDataset
List<Dataset> nestedDatasets = getDatasets();
for (Dataset vnested : nestedDatasets) {
// LOOK could just open the file, not use acquire.
NetcdfFile ncfile = vnested.acquireFile(cancelTask);
DatasetConstructor.transferDataset(ncfile, ncDataset, null);
// do not close - all stay open. Could use Proxy if need to open only as needed.
openDatasets.add(ncfile);
}
}
@Override
protected void rebuildDataset() throws IOException {
ncDataset.empty();
buildNetcdfDataset( null);
}
@Override
protected void closeDatasets() throws IOException {
for (NetcdfFile ncfile : openDatasets) {
try {
ncfile.close();
} catch (IOException e) {
// ignore
}
}
super.closeDatasets();
}
}