org.apache.ojb.broker.util
Class ConstructorHelper

java.lang.Object
  org.apache.ojb.broker.util.ConstructorHelper

public class ConstructorHelper
extends Object

This class helps us to construct new instances. We don't want to rely on public default constructors and have to try hard to also use private or protected constructors.

Version:

$Id: ConstructorHelper.java,v 1.1 2007-08-24 22:17:36 ewestfal Exp $

Author:

Thomas Mahler, Lance Eason

Field Summary

private static Object[]

NO_ARGS represents a zero sized parameter array

Constructor Summary

private

ConstructorHelper() no public constructor, please use the static method only.

Method Summary

static Object	instantiate(Class clazz) create a new instance of class clazz.
static Object	instantiate(Constructor constructor) create a new instance of the class represented by the no-argument constructor provided

Methods inherited from class java.lang.Object

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

Field Detail

NO_ARGS

private static final Object[] NO_ARGS

represents a zero sized parameter array

Constructor Detail

ConstructorHelper

private ConstructorHelper()

no public constructor, please use the static method only.

Method Detail

instantiate

public static Object instantiate(Class clazz)
                          throws InstantiationException

create a new instance of class clazz. first use the public default constructor. If this fails also try to use protected an private constructors.

Parameters:

clazz - the class to instantiate

Returns:

the fresh instance of class clazz

Throws:

InstantiationException

instantiate

public static Object instantiate(Constructor constructor)
                          throws InstantiationException

create a new instance of the class represented by the no-argument constructor provided

Parameters:

constructor - the zero argument constructor for the class

Returns:

a new instance of the class

Throws:

InstantiationException

ClassNotPersistenceCapableException - if the constructor is null or there is an exception while trying to create a new instance