org.glassfish.gmbal.util
Class GenericConstructor<T>

java.lang.Object
  org.glassfish.gmbal.util.GenericConstructor<T>

public class GenericConstructor<T>
extends java.lang.Object

Class that allows any class to be instantiated via any accessible constructor. Really a short hand to avoid writing a bunch of reflective code.

Constructor Summary

GenericConstructor(java.lang.Class<T> type, java.lang.String className, java.lang.Class<?>... signature)
Create a generic of type T for the untyped class cls.

Method Summary

T	create(java.lang.Object... args) Create an instance of type T using the constructor that matches the given arguments if possible.

Methods inherited from class java.lang.Object

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

Constructor Detail

GenericConstructor

public GenericConstructor(java.lang.Class<T> type,
                          java.lang.String className,
                          java.lang.Class<?>... signature)

Create a generic of type T for the untyped class cls. Generally cls is a class that has been generated and loaded, so no compiled code can depend on the class directly. However, the generated class probably implements some interface T, represented here by Class.

Parameters:

type - The expected type of a create call.

className - The name of the class to use for a constructor.

signature - The signature of the desired constructor.

Throws:

java.lang.IllegalArgumentException - if cls is not a subclass of type.

Method Detail

create

public T create(java.lang.Object... args)

Create an instance of type T using the constructor that matches the given arguments if possible. The constructor is cached, so an instance of GenericClass should always be used for the same types of arguments. If a call fails, a check is made to see if a different constructor could be used.

Parameters:

args - The constructor arguments.

Returns:

A new instance of the object.