com.cc.framework.adapter
Class FrameworkAdapterFactory

java.lang.Object
  com.cc.framework.adapter.FrameworkAdapterFactory

All Implemented Interfaces:

Factory, Singleton

public abstract class FrameworkAdapterFactory

extends java.lang.Object

implements Singleton, Factory

Factory class for Framework Adapters. An application can register a framework adapter direct by calling the registerAdapter()method or let the factory search for a matching framework adapter.

Version:

$Revision: 1.12 $

Author:

Harald Schulz

Field Summary

private static FrameworkAdapter	adapter The cached framework adapter instance
private static org.apache.commons.logging.Log	log Commons Logging instance.

Constructor Summary

private

FrameworkAdapterFactory() Constructor

Method Summary

private static FrameworkAdapter	createAdapter() Creates a new framework adapter for the current application.
static FrameworkAdapter	getAdapter() Retrieves an adapter for the current host framework.
protected static java.lang.ClassLoader	getContextClassLoader() Return the thread context class loader if available.
private static java.lang.Class	loadClass(java.lang.String name) MUST KEEP THIS METHOD PRIVATE Exposing this method establishes a security violation.
static void	registerAdapter(FrameworkAdapter newAdapter) Registers the Framework Adapter that should be used for this Application

Methods inherited from class java.lang.Object

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

Field Detail

log

private static org.apache.commons.logging.Log log

Commons Logging instance.

adapter

private static FrameworkAdapter adapter

The cached framework adapter instance

Constructor Detail

FrameworkAdapterFactory

private FrameworkAdapterFactory()

Constructor

Method Detail

getAdapter

public static FrameworkAdapter getAdapter()

Retrieves an adapter for the current host framework. The adapter is used to access information from the underlying host framework -> Common Controls is only a presentation framework!

Returns:

Framework adapter

registerAdapter

public static void registerAdapter(FrameworkAdapter newAdapter)

Registers the Framework Adapter that should be used for this Application

Parameters:

newAdapter - Framework Adapter

createAdapter

private static FrameworkAdapter createAdapter()

Creates a new framework adapter for the current application. The decision is made on the current classpath. It is possible to set a FrameworkAdapter by calling the registerAdapter() method in a servlets init() method()

Returns:

Framework Adapter

getContextClassLoader

protected static java.lang.ClassLoader getContextClassLoader()
                                                      throws java.lang.IllegalAccessException,
                                                             java.lang.reflect.InvocationTargetException

Return the thread context class loader if available. Otherwise return null. The thread context class loader is available for JDK 1.2 or later, if certain security conditions are met.

Returns:

ClassLoader

Throws:

java.lang.IllegalAccessException - error

java.lang.reflect.InvocationTargetException - error

loadClass

private static java.lang.Class loadClass(java.lang.String name)
                                  throws java.lang.ClassNotFoundException

MUST KEEP THIS METHOD PRIVATE

Exposing this method establishes a security violation. This method uses AccessController.doPrivileged().

Load a class, try first the thread class loader, and if it fails use the loader that loaded this class.

Parameters:

name - the class name

Returns:

Class

Throws:

java.lang.ClassNotFoundException - error

java.lang.IllegalAccessException - error

java.lang.reflect.InvocationTargetException - error