Constructor Detail

• ClassUtil

  public ClassUtil()

Method Detail

• findSuperTypes

  public static List<Class<?>> findSuperTypes​(Class<?> cls,
                                              Class<?> endBefore)

  Method that will find all sub-classes and implemented interfaces of a given class or interface. Classes are listed in order of precedence, starting with the immediate super-class, followed by interfaces class directly declares to implemented, and then recursively followed by parent of super-class and so forth. Note that Object.class is not included in the list regardless of whether endBefore argument is defined or not.

  Parameters:

  endBefore - Super-type to NOT include in results, if any; when encountered, will be ignored (and no super types are checked).

• findSuperTypes

  public static List<Class<?>> findSuperTypes​(Class<?> cls,
                                              Class<?> endBefore,
                                              List<Class<?>> result)

• canBeABeanType

  public static String canBeABeanType​(Class<?> type)

  Returns:

  Null if class might be a bean; type String (that identifies why it's not a bean) if not

• isLocalType

  @Deprecated
  public static String isLocalType​(Class<?> type)

  Deprecated.

  since 1.9, use variant that takes second argument

• isLocalType

  public static String isLocalType​(Class<?> type,
                                   boolean allowNonStatic)

  Since:

  1.9

• getOuterClass

  public static Class<?> getOuterClass​(Class<?> type)

  Method for finding enclosing class for non-static inner classes

  Since:

  1.9

• isProxyType

  public static boolean isProxyType​(Class<?> type)

  Helper method used to weed out dynamic Proxy types; types that do not expose concrete method API that we could use to figure out automatic Bean (property) based serialization.

• isConcrete

  public static boolean isConcrete​(Class<?> type)

  Helper method that checks if given class is a concrete one; that is, not an interface or abstract class.

• isConcrete

  public static boolean isConcrete​(Member member)

  Since:

  1.6

• isCollectionMapOrArray

  public static boolean isCollectionMapOrArray​(Class<?> type)

• getClassDescription

  public static String getClassDescription​(Object classOrInstance)

  Helper method used to construct appropriate description when passed either type (Class) or an instance; in latter case, class of instance is to be used.

• findClass

  public static Class<?> findClass​(String className)
                            throws ClassNotFoundException

  Throws:

  ClassNotFoundException

• hasGetterSignature

  public static boolean hasGetterSignature​(Method m)

• getRootCause

  public static Throwable getRootCause​(Throwable t)

  Method that can be used to find the "root cause", innermost of chained (wrapped) exceptions.

• throwRootCause

  public static void throwRootCause​(Throwable t)
                             throws Exception

  Method that will unwrap root causes of given Throwable, and throw the innermost Exception or Error as is. This is useful in cases where mandatory wrapping is added, which is often done by Reflection API.

  Throws:

  Exception

  Since:

  1.7

• throwAsIAE

  public static void throwAsIAE​(Throwable t)

  Method that will wrap 't' as an IllegalArgumentException if it is a checked exception; otherwise (runtime exception or error) throw as is

• throwAsIAE

  public static void throwAsIAE​(Throwable t,
                                String msg)

  Method that will wrap 't' as an IllegalArgumentException (and with specified message) if it is a checked exception; otherwise (runtime exception or error) throw as is

• unwrapAndThrowAsIAE

  public static void unwrapAndThrowAsIAE​(Throwable t)

  Method that will locate the innermost exception for given Throwable; and then wrap it as an IllegalArgumentException if it is a checked exception; otherwise (runtime exception or error) throw as is

• unwrapAndThrowAsIAE

  public static void unwrapAndThrowAsIAE​(Throwable t,
                                         String msg)

  Method that will locate the innermost exception for given Throwable; and then wrap it as an IllegalArgumentException if it is a checked exception; otherwise (runtime exception or error) throw as is

• createInstance

  public static <T> T createInstance​(Class<T> cls,
                                     boolean canFixAccess)
                              throws IllegalArgumentException

  Method that can be called to try to create an instantiate of specified type. Instantiation is done using default no-argument constructor.

  Parameters:

  canFixAccess - Whether it is possible to try to change access rights of the default constructor (in case it is not publicly accessible) or not.

  Throws:

  IllegalArgumentException - If instantiation fails for any reason; except for cases where constructor throws an unchecked exception (which will be passed as is)

• findConstructor

  public static <T> Constructor<T> findConstructor​(Class<T> cls,
                                                   boolean canFixAccess)
                                            throws IllegalArgumentException

  Throws:

  IllegalArgumentException

• defaultValue

  public static Object defaultValue​(Class<?> cls)

  Helper method used to get default value for wrappers used for primitive types (0 for Integer etc)

  Since:

  1.6.1

• wrapperType

  public static Class<?> wrapperType​(Class<?> primitiveType)

  Helper method for finding wrapper type for given primitive type (why isn't there one in JDK?)

  Since:

  1.7.1

• checkAndFixAccess

  public static void checkAndFixAccess​(Member member)

  Method called to check if we can use the passed method or constructor (wrt access restriction -- public methods can be called, others usually not); and if not, if there is a work-around for the problem.

• findEnumType

  public static Class<? extends Enum<?>> findEnumType​(EnumSet<?> s)

  Helper method that can be used to dynamically figure out enumeration type of given EnumSet, without having access to its declaration. Code is needed to work around design flaw in JDK.

  Since:

  1.5

• findEnumType

  public static Class<? extends Enum<?>> findEnumType​(EnumMap<?,​?> m)

  Helper method that can be used to dynamically figure out enumeration type of given EnumSet, without having access to its declaration. Code is needed to work around design flaw in JDK.

  Since:

  1.5

• findEnumType

  public static Class<? extends Enum<?>> findEnumType​(Enum<?> en)

  Helper method that can be used to dynamically figure out formal enumeration type (class) for given enumeration. This is either class of enum instance (for "simple" enumerations), or its superclass (for enums with instance fields or methods)

• findEnumType

  public static Class<? extends Enum<?>> findEnumType​(Class<?> cls)

  Helper method that can be used to dynamically figure out formal enumeration type (class) for given class of an enumeration value. This is either class of enum instance (for "simple" enumerations), or its superclass (for enums with instance fields or methods)