/*
* 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.
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package ucar.nc2.ncml;
import ucar.nc2.dataset.NetcdfDataset;
import ucar.nc2.dataset.VariableDS;
import ucar.nc2.dataset.DatasetConstructor;
import ucar.nc2.dataset.CoordinateAxis;
import ucar.nc2.constants._Coordinate;
import ucar.nc2.util.CancelTask;
import ucar.nc2.*;
import ucar.ma2.DataType;
import java.io.IOException;
import java.util.List;
/**
* JoinNew Aggregation.
*
* @author caron
*/
public class AggregationNew extends AggregationOuterDimension {
public AggregationNew(NetcdfDataset ncd, String dimName, String recheckS) {
super(ncd, dimName, Aggregation.Type.joinNew, recheckS);
}
protected void buildNetcdfDataset(CancelTask cancelTask) throws IOException {
buildCoords(cancelTask);
// open a "typical" nested dataset and copy it to newds
Dataset typicalDataset = getTypicalDataset();
NetcdfFile typical = typicalDataset.acquireFile(null);
DatasetConstructor.transferDataset(typical, ncDataset, null);
// create aggregation dimension
String dimName = getDimensionName();
Dimension aggDim = new Dimension(dimName, getTotalCoords());
ncDataset.removeDimension(null, dimName); // remove previous declaration, if any
ncDataset.addDimension(null, aggDim);
promoteGlobalAttributes( (DatasetOuterDimension) typicalDataset);
// create aggregation coordinate variable
DataType coordType = getCoordinateType();
VariableDS joinAggCoord = new VariableDS(ncDataset, null, null, dimName, coordType, dimName, null, null);
ncDataset.addVariable(null, joinAggCoord);
joinAggCoord.setProxyReader( this);
if (isDate)
joinAggCoord.addAttribute(new ucar.nc2.Attribute(_Coordinate.AxisType, "Time"));
// if speced externally, this variable will get replaced
CacheVar cv = new CoordValueVar(joinAggCoord.getFullName(), joinAggCoord.getDataType(), joinAggCoord.getUnitsString());
joinAggCoord.setSPobject( cv);
cacheList.add(cv);
List<String> aggVarNames = getAggVariableNames();
// if no names specified, add all "non-coordinate" variables.
// Note that we havent identified coordinate systems with CoordSysBuilder, so that info ius not available.
// So this isnt that general of a solution. But probably better than nothing
if (aggVarNames.size() == 0) {
for (Variable v : typical.getVariables()) {
if (!(v instanceof CoordinateAxis))
aggVarNames.add(v.getShortName());
}
}
// now we can create all the aggNew variables
// use only named variables
for (String varname : aggVarNames) {
Variable aggVar = ncDataset.findVariable(varname);
if (aggVar == null) {
logger.error(ncDataset.getLocation() + " aggNewDimension cant find variable " + varname);
continue;
}
// construct new variable, replace old one LOOK what about Structures?
Group newGroup = DatasetConstructor.findGroup(ncDataset, aggVar.getParentGroup());
VariableDS vagg = new VariableDS(ncDataset, newGroup, null, aggVar.getShortName(), aggVar.getDataType(),
dimName + " " + aggVar.getDimensionsString(), null, null);
vagg.setProxyReader( this);
DatasetConstructor.transferVariableAttributes(aggVar, vagg);
// _CoordinateAxes if it exists must be modified
Attribute att = vagg.findAttribute(_Coordinate.Axes);
if (att != null) {
String axes = dimName + " " + att.getStringValue();
vagg.addAttribute(new Attribute(_Coordinate.Axes, axes));
}
newGroup.removeVariable( aggVar.getShortName());
newGroup.addVariable( vagg);
aggVars.add(vagg);
if (cancelTask != null && cancelTask.isCancel()) return;
}
setDatasetAcquireProxy(typicalDataset, ncDataset);
typicalDataset.close( typical); // close it because we use DatasetProxyReader to acquire
}
/**
* What is the data type of the aggregation coordinate ?
*
* @return the data type of the aggregation coordinate
*/
private DataType getCoordinateType() {
List<Dataset> nestedDatasets = getDatasets();
DatasetOuterDimension first = (DatasetOuterDimension) nestedDatasets.get(0);
return first.isStringValued ? DataType.STRING : DataType.DOUBLE;
}
}