/*
* 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
* and understandings on the user. The user is granted the right, without
* 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
* supporting documentation. Further, UCAR requests that the user credit
* UCAR/Unidata in any publications that result from the use of this
* software or in any product that includes this software. The names UCAR
* and/or Unidata, however, may not be used in any advertising or publicity
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*
* THIS SOFTWARE IS PROVIDED BY UCAR/UNIDATA "AS IS" AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL UCAR/UNIDATA BE LIABLE FOR ANY SPECIAL,
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*/
package ucar.nc2;
import org.junit.Test;
import ucar.ma2.Array;
import ucar.ma2.DataType;
import ucar.nc2.dataset.NetcdfDataset;
import ucar.nc2.ncml.NcMLReader;
import ucar.unidata.util.test.TestDir;
import java.io.IOException;
import java.io.StringReader;
/**
* Test that adding _Unsigned attribute in NcML works correctly
*
* @author caron
* @since Aug 7, 2008
*/
public class TestUnsigned {
@Test
public void testSigned() throws IOException {
NetcdfFile ncfile = NetcdfDataset.openDataset(TestDir.cdmLocalTestDataDir + "testWrite.nc");
Variable v = null;
assert(null != (v = ncfile.findVariable("bvar")));
assert !v.isUnsigned();
assert v.getDataType() == DataType.BYTE;
boolean hasSigned = false;
Array data = v.read();
while (data.hasNext()) {
byte b = data.nextByte();
if (b < 0) hasSigned = true;
}
assert hasSigned;
ncfile.close();
}
@Test
public void testUnsigned() throws IOException {
NetcdfFile ncfile = NetcdfDataset.openDataset(TestDir.cdmLocalTestDataDir + "testUnsignedByte.ncml");
Variable v = null;
assert(null != (v = ncfile.findVariable("bvar")));
assert v.getDataType() == DataType.FLOAT;
boolean hasSigned = false;
Array data = v.read();
while (data.hasNext()) {
float b = data.nextFloat();
if (b < 0) hasSigned = true;
}
assert !hasSigned;
ncfile.close();
}
@Test
public void testUnsignedWrap() throws IOException {
String ncml = "<?xml version='1.0' encoding='UTF-8'?>\n" +
"<netcdf xmlns='http://www.unidata.ucar.edu/namespaces/netcdf/ncml-2.2' location='"+TestDir.cdmLocalTestDataDir +"testWrite.nc'>\n" +
" <variable name='bvar' shape='lat' type='byte'>\n" +
" <attribute name='_Unsigned' value='true' />\n" +
" <attribute name='scale_factor' type='float' value='2.0' />\n" +
" </variable>\n" +
"</netcdf>";
NetcdfFile ncfile = NcMLReader.readNcML(new StringReader(ncml), null);
NetcdfFile ncd = NetcdfDataset.wrap(ncfile, NetcdfDataset.getEnhanceAll());
Variable v = ncd.findVariable("bvar");
assert(null != v);
assert v.getDataType() == DataType.FLOAT;
boolean hasSigned = false;
Array data = v.read();
while (data.hasNext()) {
float b = data.nextFloat();
if (b < 0) hasSigned = true;
}
assert !hasSigned;
ncd.close();
}
}