/*
* 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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* any fee or cost, to use, copy, modify, alter, enhance and distribute
* this software, and any derivative works thereof, and its supporting
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*
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package ucar.nc2.iosp.mcidas;
import ucar.ma2.Array;
import ucar.nc2.Attribute;
import ucar.nc2.Variable;
import ucar.nc2.dataset.CoordinateTransform;
import ucar.nc2.dataset.NetcdfDataset;
import ucar.nc2.dataset.ProjectionCT;
import ucar.nc2.dataset.TransformType;
import ucar.nc2.dataset.transform.AbstractCoordTransBuilder;
/**
* Projection based on Mcidas Area files.
*
* @author caron
*/
public class McIDASAreaTransformBuilder extends AbstractCoordTransBuilder {
/**
* Get the transform name
*
* @return the transform name
*/
public String getTransformName() {
return McIDASAreaProjection.GRID_MAPPING_NAME;
}
/**
* Get the Transform Type
*
* @return TransformType.Projection
*/
public TransformType getTransformType() {
return TransformType.Projection;
}
/**
* Make the coordinate transform
*
* @param ds the dataset
* @param ctv the coordinate transform variable
*
* @return the coordinate transform
*/
public CoordinateTransform makeCoordinateTransform(NetcdfDataset ds,
Variable ctv) {
int[] area = getIntArray(ctv, McIDASAreaProjection.ATTR_AREADIR);
int[] nav = getIntArray(ctv, McIDASAreaProjection.ATTR_NAVBLOCK);
int[] aux = null;
if (ctv.findAttributeIgnoreCase(McIDASAreaProjection.ATTR_AUXBLOCK)
!= null) {
aux = getIntArray(ctv, McIDASAreaProjection.ATTR_AUXBLOCK);
}
McIDASAreaProjection proj = new McIDASAreaProjection(area, nav, aux);
return new ProjectionCT(ctv.getShortName(), "FGDC", proj);
}
/**
* get the int array from the variable attribute
*
* @param ctv coordinate transform variable
* @param attName the attribute name
*
* @return the int array
*/
private int[] getIntArray(Variable ctv, String attName) {
Attribute att = ctv.findAttribute(attName);
if (att == null) {
throw new IllegalArgumentException(
"McIDASArea coordTransformVariable " + ctv.getFullName()
+ " must have " + attName + " attribute");
}
Array arr = att.getValues();
return (int[]) arr.get1DJavaArray(int.class);
}
}