Class ConversionHandler

    • Constructor Detail

      • ConversionHandler

        public ConversionHandler​(Object delegate)
        Creates a ConversionHandler with an delegate.
        delegate - the delegate
        IllegalArgumentException - if the given delegate is null
    • Method Detail

      • getDelegate

        public Object getDelegate()
        Returns the delegate.
        the delegate
      • invoke

        public Object invoke​(Object proxy,
                             Method method,
                             Object[] args)
                      throws Throwable
        This method is a default implementation for the invoke method given in InvocationHandler. Any call to a method with a declaring class that is not Object, excluding toString() and default methods is redirected to invokeCustom.

        Methods like equals and hashcode are called on the class itself instead of the delegate because they are considered fundamental methods that should not be overwritten. The toString() method gets special treatment as it is deemed to be a method that you might wish to override when called from Groovy. Interface default methods from Java 8 on the other hand are considered being default implementations you don't normally want to change. So they are called directly too

        In many scenarios, it is better to overwrite the invokeCustom method where the core Object related methods are filtered out.

        Specified by:
        invoke in interface InvocationHandler
        proxy - the proxy
        method - the method
        args - the arguments
        the result of the invocation by method or delegate
        Throwable - if caused by the delegate or the method
        See Also:
        invokeCustom(Object, Method, Object[]), InvocationHandler.invoke(java.lang.Object, java.lang.reflect.Method, java.lang.Object[])
      • isDefaultMethod

        protected boolean isDefaultMethod​(Method method)
      • checkMethod

        protected boolean checkMethod​(Method method)
      • equals

        public boolean equals​(Object obj)
        Indicates whether some other object is "equal to" this one. The delegate is used if the class of the parameter and the current class are equal. In other cases the method will return false. The exact class is here used, if inheritance is needed, this method must be overwritten.
        equals in class Object
        See Also:
      • isCoreObjectMethod

        public static boolean isCoreObjectMethod​(Method method)
        Checks whether a method is a core method from java.lang.Object. Such methods often receive special treatment because they are deemed fundamental enough to not be tampered with.
        method - the method to check
        true if the method is deemed to be a core method