How to use

getParameterDescriptors

method

in

org.apache.sis.referencing.operation.DefaultConversion

/**
 * Asserts that at least some of the properties of the given {@code op} instance have the expected values
 * for an instance created by {@link #createLongitudeRotation(GeographicCRS, GeographicCRS, TemporalCRS)}.
 */
@SuppressWarnings("SuspiciousToArrayCall")
private static void verifyProperties(final DefaultConversion op, final boolean swapSourceAxes) {
  assertEquals("name",       "Paris to Greenwich", op.getName().getCode());
  assertEquals("sourceCRS",  "NTF (Paris)",        op.getSourceCRS().getName().getCode());
  assertEquals("targetCRS",  "Back to Greenwich",  op.getTargetCRS().getName().getCode());
  assertEquals("method",     "Longitude rotation", op.getMethod().getName().getCode());
  assertEquals("parameters", "Longitude rotation", op.getParameterDescriptors().getName().getCode());
  final ParameterValueGroup parameters = op.getParameterValues();
  final ParameterValue<?>[] values = parameters.values().toArray(new ParameterValue<?>[1]);
  assertEquals("parameters",    "Longitude rotation", parameters.getDescriptor().getName().getCode());
  assertEquals("parameters[0]", "Longitude offset",    values[0].getDescriptor().getName().getCode());
  assertEquals("parameters[0]", OFFSET, values[0].doubleValue(), STRICT);
  assertEquals(1, values.length);
  final Matrix3 expected = new Matrix3();
  expected.m02 = OFFSET;
  if (swapSourceAxes) {
    expected.m00 = expected.m11 = 0;
    expected.m01 = expected.m10 = 1;
  }
  assertMatrixEquals("Longitude rotation of a two-dimensional CRS", expected,
      MathTransforms.getMatrix(op.getMathTransform()), STRICT);
}