Package com.xebialabs.deployit.booter.local.utils

Class ClassUtils

  • public class ClassUtils
extends java.lang.Object
    Utility methods for dealing with Classes.
    Since:
    9 Feb 2009

    • Constructor Summary

      Constructors 
      Constructor Description
      ClassUtils()  

    • Method Summary

      All Methods Static Methods Concrete Methods 
      Modifier and Type Method Description
      static <S> java.util.List<java.lang.Class<?>> getActualTypeArguments​(java.lang.Class<? extends S> typedClass, java.lang.Class<S> typedSuperclass)
      Retrieves the type arguments of a class when regarded as an subclass of the given typed superclass or interface.

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    • Constructor Detail

      • ClassUtils

        public ClassUtils()

    • Method Detail

      • getActualTypeArguments

        public static <S> java.util.List<java.lang.Class<?>> getActualTypeArguments​(java.lang.Class<? extends S> typedClass,
                                                                            java.lang.Class<S> typedSuperclass)
        Retrieves the type arguments of a class when regarded as an subclass of the given typed superclass or interface. The order of the runtime type classes matches the order of the type variables in the declaration of the typed superclass or interface. For example, for the classes 
         class Foo<U, V> {}
 class Bar<W> extends Foo<String, W> {}
 class Baz extends Bar<Long>
        and a typedClass argument of Baz.class, the method should return
        • [String, Long] for a typedSuperclass argument of Foo.class, and
        • [Long] if typedSuperclass is Bar.class.
        For type parameters that cannot be determined, null is returned. Note: It is not possible to retrieve type information that is not available in the (super)class hierarchy at compile-time. Calling getActualTypeArguments(new ArrayList<String>().getClass(), List.class) will, for instance, return [null] because the specification of the actual type (String, in this example) did not take place either in the superclass AbstractList or the interface List. If superclass is not a superclass or -interface of class, the method returns null. This may happen (in spite of the signature) if the method is called with non-generic arguments.
        Type Parameters:
        S - the type of the object
        Parameters:
        typedClass - the class for which type information is required
        typedSuperclass - the typed class or interface of which the object is to be regarded a subclass
        Returns:
        the type arguments for the given class when regarded as a subclass of the given typed superclass, in the order defined in the superclass. If class is not a subclass of superclass, returns null.
        Throws:
        java.lang.IllegalArgumentException - if typedSuperclass or typedClass is null