Class ClassUtil

src/main/java/com/oltpbenchmark/util/ClassUtil.java:33–204

@author pavlo

 * @author pavlo
 */
public abstract class ClassUtil {
  private static final Logger LOG = LoggerFactory.getLogger(ClassUtil.class);

  private static final Map<Class<?>, List<Class<?>>> CACHE_getSuperClasses = new HashMap<>();
  private static final Map<Class<?>, Set<Class<?>>> CACHE_getInterfaceClasses = new HashMap<>();

  /**
   * Get the generic types for the given field
   *
   * @param field
   * @return
   */
  public static List<Class<?>> getGenericTypes(Field field) {
    ArrayList<Class<?>> generic_classes = new ArrayList<>();
    Type gtype = field.getGenericType();
    if (gtype instanceof ParameterizedType) {
      ParameterizedType ptype = (ParameterizedType) gtype;
      getGenericTypesImpl(ptype, generic_classes);
    }
    return (generic_classes);
  }

  private static void getGenericTypesImpl(ParameterizedType ptype, List<Class<?>> classes) {
    // list the actual type arguments
    for (Type t : ptype.getActualTypeArguments()) {
      if (t instanceof Class) {
        //                System.err.println("C: " + t);
        classes.add((Class<?>) t);
      } else if (t instanceof ParameterizedType) {
        ParameterizedType next = (ParameterizedType) t;
        //                System.err.println("PT: " + next);
        classes.add((Class<?>) next.getRawType());
        getGenericTypesImpl(next, classes);
      }
    }
  }

  /**
   * Return an ordered list of all the sub-classes for a given class Useful when dealing with
   * generics
   *
   * @param element_class
   * @return
   */
  public static List<Class<?>> getSuperClasses(Class<?> element_class) {
    List<Class<?>> ret = ClassUtil.CACHE_getSuperClasses.get(element_class);
    if (ret == null) {
      ret = new ArrayList<>();
      while (element_class != null) {
        ret.add(element_class);
        element_class = element_class.getSuperclass();
      }
      ret = Collections.unmodifiableList(ret);
      ClassUtil.CACHE_getSuperClasses.put(element_class, ret);
    }
    return (ret);
  }