How to use

isString

method

in

ucar.nc2.Attribute

protected void unravelStringMet(NetcdfFile ncFile, Group group, Metadata met) {
  if (group == null) {
    group = ncFile.getRootGroup();
  }
  // get file type
  met.set("File-Type-Description", ncFile.getFileTypeDescription());
  // unravel its string attrs
  for (Attribute attribute : group.getAttributes()) {
    if (attribute.isString()) {
      met.add(attribute.getFullName(), attribute.getStringValue());
    } else {
      // try and cast its value to a string
      met.add(attribute.getFullName(), String.valueOf(attribute
          .getNumericValue()));
    }
  }
  for (Group g : group.getGroups()) {
    unravelStringMet(ncFile, g, met);
  }
}

private double findAttributeDouble(NetcdfDataset ds, String attname) {
 Attribute att = ds.findGlobalAttributeIgnoreCase(attname);
 if ((att == null) || (att.isString())) return Double.NaN;
 return att.getNumericValue().doubleValue();
}

private double findAttributeDouble(NetcdfDataset ds, String attname) {
 Attribute att = ds.findGlobalAttributeIgnoreCase(attname);
 if ((att == null) || (att.isString())) return Double.NaN;
 return att.getNumericValue().doubleValue();
}

static private boolean hasStringAttribute_( NetcdfFile ncFile, String name,
                      int length ) {
 Attribute a = ncFile.findGlobalAttribute( name );
 return a != null && a.isString() && a.getStringValue().length()==length;
}

private double findAttributeDouble(NetcdfDataset ds, String attname) {
 Attribute att = ds.findGlobalAttributeIgnoreCase(attname);
 if ((att == null) || (att.isString())) return Double.NaN;
 return att.getNumericValue().doubleValue();
}

/**
 * Get the value as an Object.
 *
 * @param index which index
 * @return ith value as an Object.
 */
public Object getValue(int index) {
 if (isString()) return getStringValue(index);
 return getNumericValue(index);
}

@Override
public String findAttValueIgnoreCase(String attName, String defaultValue) {
 String attValue = null;
 Attribute att = findAttributeIgnoreCase(attName);
 if ((att != null) && att.isString())
  attValue = att.getStringValue();
 if (null == attValue)                     // not found, use default
  attValue = defaultValue;
 return attValue;
}

/**
 * Get the value as an Object.
 *
 * @param index which index
 * @return ith value as an Object.
 */
public Object getValue(int index) {
 if (isString()) return getStringValue(index);
 return getNumericValue(index);
}

/**
 * Get the value as an Object.
 *
 * @param index which index
 * @return ith value as an Object.
 */
public Object getValue(int index) {
 if (isString()) return getStringValue(index);
 return getNumericValue(index);
}

private double checkValue(Variable v, Double value) {
  Attribute aStandardName = v.findAttributeIgnoreCase(CFConstants.STANDARD_NAME);
  if (aStandardName.isString() && CFStandardNames.DEPTH.getName().equals(aStandardName.getStringValue())) {
    return value != 0.0 ? value * (-1.0) : value;
  }
  return value;
}

public double readAttributeDouble(Variable v, String attName, double defValue) {
 Attribute att;
 if (v == null)
  att = rootGroup.findAttributeIgnoreCase(attName);
 else
  att = v.findAttributeIgnoreCase(attName);
 if (att == null) return defValue;
 if (att.isString())
  return Double.parseDouble(att.getStringValue());
 else
  return att.getNumericValue().doubleValue();
}

public int readAttributeInteger(Variable v, String attName, int defValue) {
 Attribute att;
 if (v == null)
  att = rootGroup.findAttributeIgnoreCase(attName);
 else
  att = v.findAttributeIgnoreCase(attName);
 if (att == null) return defValue;
 if (att.isString())
  return Integer.parseInt(att.getStringValue());
 else
  return att.getNumericValue().intValue();
}

public int readAttributeInteger(Variable v, String attName, int defValue) {
 Attribute att;
 if (v == null)
  att = rootGroup.findAttributeIgnoreCase(attName);
 else
  att = v.findAttributeIgnoreCase(attName);
 if (att == null) return defValue;
 if (att.isString())
  return Integer.parseInt(att.getStringValue());
 else
  return att.getNumericValue().intValue();
}

public int readAttributeInteger(Variable v, String attName, int defValue) {
 Attribute att;
 if (v == null)
  att = rootGroup.findAttributeIgnoreCase(attName);
 else
  att = v.findAttributeIgnoreCase(attName);
 if (att == null) return defValue;
 if (att.isString())
  return Integer.parseInt(att.getStringValue());
 else
  return att.getNumericValue().intValue();
}

public double readAttributeDouble(Variable v, String attName, double defValue) {
 Attribute att;
 if (v == null)
  att = rootGroup.findAttributeIgnoreCase(attName);
 else
  att = v.findAttributeIgnoreCase(attName);
 if (att == null) return defValue;
 if (att.isString())
  return Double.parseDouble(att.getStringValue());
 else
  return att.getNumericValue().doubleValue();
}

public double readAttributeDouble(Variable v, String attName, double defValue) {
 Attribute att;
 if (v == null)
  att = rootGroup.findAttributeIgnoreCase(attName);
 else
  att = v.findAttributeIgnoreCase(attName);
 if (att == null) return defValue;
 if (att.isString())
  return Double.parseDouble(att.getStringValue());
 else
  return att.getNumericValue().doubleValue();
}

@Test
public void testVlengthAttribute() throws IOException {
 try (NetcdfFile ncfile = TestH5.openH5("support/vlstra.h5")) {
  Attribute att = ncfile.findGlobalAttribute("test_scalar");
  assert (null != att);
  assert (!att.isArray());
  assert (att.isString());
  assert (att.getStringValue().equals("This is the string for the attribute"));
 }
}

private boolean computeIsInterval() {
 intervalWasComputed = true;
 Attribute boundsAtt = findAttributeIgnoreCase(CF.BOUNDS);
 if ((null == boundsAtt) || !boundsAtt.isString()) return false;
 String boundsVarName = boundsAtt.getStringValue();
 VariableDS boundsVar = (VariableDS) ncd.findVariable(getParentGroup(), boundsVarName);
 if (null == boundsVar) return false;
 if (3 != boundsVar.getRank()) return false;
 if (getDimension(0) != boundsVar.getDimension(0)) return false;
 return 2 == boundsVar.getDimension(2).getLength();
}

public void testReplaceAtt() {
 // System.out.println("\nncfile = "+ncfile);
 Attribute att = ncfile.findGlobalAttribute("title");
 assert null != att;
 assert !att.isArray();
 assert att.isString();
 assert att.getDataType() == DataType.STRING;
 assert att.getStringValue().equals("replaced");
 assert att.getNumericValue() == null;
 assert att.getNumericValue(3) == null;
}

private boolean computeIsInterval() {
 intervalWasComputed = true;
 Attribute boundsAtt = findAttributeIgnoreCase(CF.BOUNDS);
 if ((null == boundsAtt) || !boundsAtt.isString()) return false;
 String boundsVarName = boundsAtt.getStringValue();
 VariableDS boundsVar = (VariableDS) ncd.findVariable(getParentGroup(), boundsVarName);
 if (null == boundsVar) return false;
 if (3 != boundsVar.getRank()) return false;
 if (getDimension(0) != boundsVar.getDimension(0)) return false;
 if (getDimension(1) != boundsVar.getDimension(1)) return false;
 return 2 == boundsVar.getDimension(2).getLength();
}