How to use

CoordinateTransform

in

ucar.nc2.dataset

private static CoverageTransform makeTransform(ucar.nc2.dataset.CoordinateTransform dt) {
 AttributeContainerHelper atts = new AttributeContainerHelper(dt.getName());
 for (Parameter p : dt.getParameters())
  atts.addAttribute(new Attribute(p));
 return new CoverageTransform(dt.getName(), atts, dt.getTransformType() == TransformType.Projection);
}

/**
 * Instances which have same name, authority and parameters are equal.
 */
public boolean equals(Object oo) {
 if (this == oo) return true;
 if (!(oo instanceof CoordinateTransform)) return false;
 CoordinateTransform o = (CoordinateTransform) oo;
 if (!getName().equals(o.getName())) return false;
 if (!getAuthority().equals(o.getAuthority())) return false;
 if (!(getTransformType() == o.getTransformType())) return false;
 List<Parameter> oparams = o.getParameters();
 if (params.size() != oparams.size()) return false;
 for (int i = 0; i < params.size(); i++) {
  Parameter att =  params.get(i);
  Parameter oatt = oparams.get(i);
  if (!att.getName().equals(oatt.getName())) return false;
  //if (!att.getValue().equals(oatt.getValue())) return false;
 }
 return true;
}

/**
 * Override Object.hashCode() to be consistent with equals.
 */
public int hashCode() {
 if (hashCode == 0) {
  int result = 17;
  result = 37 * result + getName().hashCode();
  result = 37 * result + getAuthority().hashCode();
  result = 37 * result + getTransformType().hashCode();
  for (Parameter att : params) {
   result = 37 * result + att.getName().hashCode();
   //result = 37*result + att.getValue().hashCode();
  }
  hashCode = result;
 }
 return hashCode;
}

@Test
public void testCF() throws IOException {
 try (GridDataset ds = GridDataset.open(TestDir.cdmUnitTestDir + "conventions/cf/twoGridMaps.nc")) {
  GeoGrid grid = ds.findGridByName("altitude");
  GridCoordSystem gcs = grid.getCoordinateSystem();
  assert 1 == gcs.getCoordinateTransforms().size();
  CoordinateTransform ct = gcs.getCoordinateTransforms().get(0);
  assert ct.getTransformType() == TransformType.Projection;
  assert ct.getName().equals("projection_stere");
 }
}

public int compareTo(Object o) {
 CoordinateTransform oct = (CoordinateTransform) o;
 return name.compareTo(oct.getName());
}

/**
 * Add a Parameter to a CoordinateTransform.
 * Make sure that the variable exists. If readData is true, read the data and use it as the value of the
 * parameter, otherwise use the variable name as the value of the parameter.
 *
 * @param rs             the CoordinateTransform
 * @param paramName      the parameter name
 * @param ds             dataset
 * @param varNameEscaped escaped variable name
 * @return true if success, false is failed
 */
protected boolean addParameter(CoordinateTransform rs, String paramName, NetcdfFile ds, String varNameEscaped) {
 if (null == (ds.findVariable(varNameEscaped))) {
  if (null != errBuffer)
   errBuffer.format("CoordTransBuilder %s: no Variable named %s%n", getTransformName(), varNameEscaped);
  return false;
 }
 rs.addParameter(new Parameter(paramName, varNameEscaped));
 return true;
}

List<CoordinateTransform> cctt =  grid.getCoordinateSystem().getCoordinateTransforms();
for(CoordinateTransform ct : cctt){
  Parameter param = ct.findParameterIgnoreCase( CF.FORMULA_TERMS );

assert tList != null;
for (CoordinateTransform ct : tList) {
 if (ct.getTransformType() == TransformType.Projection)
  pList.add(ct);
assert ct.getTransformType() == TransformType.Projection;
assert ct instanceof ProjectionCT;

Variable v = ncd.findVariable(ct.getName());
if (ct.getTransformType() == TransformType.Projection)
 newV.addAttribute(new Attribute(CF.GRID_MAPPING, v.getFullName()));

@Override
public int compareTo(CoordinateTransform oct) {
 return name.compareTo(oct.getName());
}

/**
 * Override Object.hashCode() to be consistent with equals.
 */
public int hashCode() {
 if (hashCode == 0) {
  int result = 17;
  result = 37 * result + getName().hashCode();
  result = 37 * result + getAuthority().hashCode();
  result = 37 * result + getTransformType().hashCode();
  for (Parameter att : params) {
   result = 37 * result + att.getName().hashCode();
   //result = 37*result + att.getValue().hashCode();
  }
  hashCode = result;
 }
 return hashCode;
}

/**
 * Add a Parameter to a CoordinateTransform.
 * Make sure that the variable exists. If readData is true, read the data and use it as the value of the
 * parameter, otherwise use the variable name as the value of the parameter.
 *
 * @param rs             the CoordinateTransform
 * @param paramName      the parameter name
 * @param ds             dataset
 * @param varNameEscaped escaped variable name
 * @return true if success, false is failed
 */
protected boolean addParameter(CoordinateTransform rs, String paramName, NetcdfFile ds, String varNameEscaped) {
 if (null == (ds.findVariable(varNameEscaped))) {
  if (null != errBuffer)
   errBuffer.format("CoordTransBuilder %s: no Variable named %s\n", getTransformName(), varNameEscaped);
  return false;
 }
 rs.addParameter(new Parameter(paramName, varNameEscaped));
 return true;
}

List<CoordinateTransform> cctt = grid.getCoordinateSystem().getCoordinateTransforms();
for (CoordinateTransform ct : cctt) {
 Parameter param = ct.findParameterIgnoreCase(CF.FORMULA_TERMS);

 if (ct.getTransformType() == TransformType.Vertical)
  vList.add(ct);
assert ct.getTransformType() == TransformType.Vertical;
assert ct instanceof VerticalCT;

private Element writeCoordTransform(CoordinateTransform ct) {
 Element ctElem = new Element("coordTransform");
 ctElem.setAttribute("name", ct.getName());
 ctElem.setAttribute("transformType", ct.getTransformType().toString());
 List params = ct.getParameters();
 for (int i = 0; i < params.size(); i++) {
  Parameter param = (Parameter) params.get(i);
  Element pElem = new Element("parameter");
  pElem.setAttribute("name", param.getName());
  pElem.setAttribute("value", param.getStringValue());
  ctElem.addContent(pElem);
 }
 return ctElem;
}

/**
 * Instances which have same name, authority and parameters are equal.
 */
public boolean equals(Object oo) {
 if (this == oo) return true;
 if (!(oo instanceof CoordinateTransform)) return false;
 CoordinateTransform o = (CoordinateTransform) oo;
 if (!getName().equals(o.getName())) return false;
 if (!getAuthority().equals(o.getAuthority())) return false;
 if (!(getTransformType() == o.getTransformType())) return false;
 List<Parameter> oparams = o.getParameters();
 if (params.size() != oparams.size()) return false;
 for (int i = 0; i < params.size(); i++) {
  Parameter att =  params.get(i);
  Parameter oatt = oparams.get(i);
  if (!att.getName().equals(oatt.getName())) return false;
  //if (!att.getValue().equals(oatt.getValue())) return false;
 }
 return true;
}

Variable v = ncd.findVariable(ct.getName());
if (ct.getTransformType() == TransformType.Projection)
  newV.addAttribute(new Attribute(CF.GRID_MAPPING, v.getFullName()));

@Override
public int compareTo(CoordinateTransform oct) {
 return name.compareTo(oct.getName());
}

/**
 * Override Object.hashCode() to be consistent with equals.
 */
public int hashCode() {
 if (hashCode == 0) {
  int result = 17;
  result = 37 * result + getName().hashCode();
  result = 37 * result + getAuthority().hashCode();
  result = 37 * result + getTransformType().hashCode();
  for (Parameter att : params) {
   result = 37 * result + att.getName().hashCode();
   //result = 37*result + att.getValue().hashCode();
  }
  hashCode = result;
 }
 return hashCode;
}

/**
 * Add a Parameter to a CoordinateTransform.
 * Make sure that the variable exists. If readData is true, read the data and use it as the value of the
 * parameter, otherwise use the variable name as the value of the parameter.
 *
 * @param rs             the CoordinateTransform
 * @param paramName      the parameter name
 * @param ds             dataset
 * @param varNameEscaped escaped variable name
 * @return true if success, false is failed
 */
protected boolean addParameter(CoordinateTransform rs, String paramName, NetcdfFile ds, String varNameEscaped) {
 if (null == (ds.findVariable(varNameEscaped))) {
  if (null != errBuffer)
   errBuffer.format("CoordTransBuilder %s: no Variable named %s%n", getTransformName(), varNameEscaped);
  return false;
 }
 rs.addParameter(new Parameter(paramName, varNameEscaped));
 return true;
}