TestAttributes.java

/*
 * 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
 * to endorse or promote any products or commercial entity unless specific
 * written permission is obtained from UCAR/Unidata. The user also
 * understands that UCAR/Unidata is not obligated to provide the user with
 * any support, consulting, training or assistance of any kind with regard
 * to the use, operation and performance of this software nor to provide
 * the user with any updates, revisions, new versions or "bug fixes."
 *
 * 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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 * FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
 * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
 * WITH THE ACCESS, USE OR PERFORMANCE OF THIS SOFTWARE.
 */
package ucar.nc2;

import junit.framework.*;
import ucar.ma2.*;
import ucar.unidata.util.test.TestDir;

import java.io.IOException;

/** Test reading attributes */

public class TestAttributes extends TestCase {

  public void testNC3ReadAttributes() throws IOException {
    NetcdfFile ncfile = TestDir.openFileLocal("testWrite.nc");

    // global attributes
    assert("face".equals(ncfile.findAttValueIgnoreCase(null, "yo", "barf")));

    Variable temp = null;
    assert(null != (temp = ncfile.findVariable("temperature")));
    assert("K".equals(ncfile.findAttValueIgnoreCase(temp, "units", "barf")));

    Attribute att = temp.findAttribute("scale");
    assert( null != att);
    assert( att.isArray());
    assert( 3 == att.getLength());
    assert( 3 == att.getNumericValue(2).intValue());

    Array aa = att.getValues();
    assert(att.getDataType() == DataType.INT);
    assert(aa.getElementType() == int.class);
    assert(aa.getSize() == 3);

    att = temp.findAttribute("versionD");
    assert( null != att);
    assert( !att.isArray());
    assert( 1 == att.getLength());
    assert( 1.2 == att.getNumericValue().doubleValue());
    assert( DataType.DOUBLE == att.getDataType());

    aa = att.getValues();
    assert(att.getDataType() == DataType.DOUBLE);
    assert(aa.getElementType() == double.class);
    assert(aa.getSize() == 1);

    att = temp.findAttribute("versionF");
    assert( null != att);
    assert( !att.isArray());
    assert( 1 == att.getLength());
    assert( 1.2f == att.getNumericValue().floatValue());
    assert( close(1.2, att.getNumericValue().doubleValue()));
    assert( DataType.FLOAT == att.getDataType());

    aa = att.getValues();
    assert(att.getDataType() == DataType.FLOAT);
    assert(aa.getElementType() == float.class);
    assert(aa.getSize() == 1);

    att = temp.findAttribute("versionI");
    assert( null != att);
    assert( !att.isArray());
    assert( 1 == att.getLength());
    assert( 1 == att.getNumericValue().intValue());
    assert( DataType.INT == att.getDataType());

    aa = att.getValues();
    assert(att.getDataType() == DataType.INT);
    assert(aa.getElementType() == int.class);
    assert(aa.getSize() == 1);

    att = temp.findAttribute("versionS");
    assert( null != att);
    assert( !att.isArray());
    assert( 1 == att.getLength());
    assert( 2 == att.getNumericValue().shortValue());
    assert( DataType.SHORT == att.getDataType());

    aa = att.getValues();
    assert(att.getDataType() == DataType.SHORT);
    assert(aa.getElementType() == short.class);
    assert(aa.getSize() == 1);

    att = temp.findAttribute("versionB");
    assert( null != att);
    assert( !att.isArray());
    assert( 1 == att.getLength());
    assert( 3 == att.getNumericValue().byteValue());
    assert( DataType.BYTE == att.getDataType());

    aa = att.getValues();
    assert(att.getDataType() == DataType.BYTE);
    assert(aa.getElementType() == byte.class);
    assert(aa.getSize() == 1);

    att = temp.findAttribute("versionString");
    assert( null != att);
    assert( !att.isArray());
    assert( 1 == att.getLength());
    assert( DataType.STRING == att.getDataType());

    Number n = att.getNumericValue();
    assert (n != null);

    ncfile.close();
  }

  boolean close( double d1, double d2) {
    //System.out.println(d1+" "+d2);
    return Math.abs((d1-d2)/d1) < 1.0e-5;
  }


}