How to use

getDeclaredFields

method

in

io.swagger.v3.core.util.ReflectionUtils

/**
 * Collects field-level parameters from class.
 *
 * @param cls        is a class for collecting
 * @param components
 * @return the collection of supported parameters
 */
public static List<Parameter> collectFieldParameters(Class<?> cls, Components components, javax.ws.rs.Consumes classConsumes, JsonView jsonViewAnnotation) {
  final List<Parameter> parameters = new ArrayList<Parameter>();
  for (Field field : ReflectionUtils.getDeclaredFields(cls)) {
    final List<Annotation> annotations = Arrays.asList(field.getAnnotations());
    final Type genericType = field.getGenericType();
    parameters.addAll(collectParameters(genericType, annotations, components, classConsumes, jsonViewAnnotation));
  }
  return parameters;
}

/**
 * Returns the list of declared fields from the class <code>cls</code> and its superclasses
 * excluding <code>Object</code> class. If the field from child class hides the field from superclass,
 * the field from superclass won't be added to the result list.
 *
 * @param cls is the processing class
 * @return list of Fields
 */
public static List<Field> getDeclaredFields(Class<?> cls) {
  if (cls == null || Object.class.equals(cls)) {
    return Collections.emptyList();
  }
  final List<Field> fields = new ArrayList<Field>();
  final Set<String> fieldNames = new HashSet<String>();
  for (Field field : cls.getDeclaredFields()) {
    fields.add(field);
    fieldNames.add(field.getName());
  }
  for (Field field : getDeclaredFields(cls.getSuperclass())) {
    if (!fieldNames.contains(field.getName())) {
      fields.add(field);
    }
  }
  return fields;
}

@Test
public void getDeclaredFieldsFromInterfaceTest() throws NoSuchMethodException {
  final Class cls = IParent.class;
  Assert.assertEquals(Collections.emptyList(), ReflectionUtils.getDeclaredFields(cls));
}

/**
 * Collects field-level parameters from class.
 *
 * @param cls        is a class for collecting
 * @param components
 * @return the collection of supported parameters
 */
public static List<Parameter> collectFieldParameters(Class<?> cls, Components components, javax.ws.rs.Consumes classConsumes, JsonView jsonViewAnnotation) {
  final List<Parameter> parameters = new ArrayList<Parameter>();
  for (Field field : ReflectionUtils.getDeclaredFields(cls)) {
    final List<Annotation> annotations = Arrays.asList(field.getAnnotations());
    final Type genericType = field.getGenericType();
    parameters.addAll(collectParameters(genericType, annotations, components, classConsumes, jsonViewAnnotation));
  }
  return parameters;
}

/**
 * Returns the list of declared fields from the class <code>cls</code> and its superclasses
 * excluding <code>Object</code> class. If the field from child class hides the field from superclass,
 * the field from superclass won't be added to the result list.
 *
 * @param cls is the processing class
 * @return list of Fields
 */
public static List<Field> getDeclaredFields(Class<?> cls) {
  if (cls == null || Object.class.equals(cls)) {
    return Collections.emptyList();
  }
  final List<Field> fields = new ArrayList<Field>();
  final Set<String> fieldNames = new HashSet<String>();
  for (Field field : cls.getDeclaredFields()) {
    fields.add(field);
    fieldNames.add(field.getName());
  }
  for (Field field : getDeclaredFields(cls.getSuperclass())) {
    if (!fieldNames.contains(field.getName())) {
      fields.add(field);
    }
  }
  return fields;
}