org.apache.commons.jelly.util
Class ClassLoaderUtils

java.lang.Object
  org.apache.commons.jelly.util.ClassLoaderUtils

public class ClassLoaderUtils
extends java.lang.Object

A class to centralize the class loader management code.

Field Summary

private static org.apache.commons.logging.Log

log log for debug etc output

Constructor Summary

ClassLoaderUtils()

Method Summary

static java.lang.ClassLoader	getClassLoader(java.lang.Class clazz) Get the loader for the given class.
static java.lang.ClassLoader	getClassLoader(java.lang.ClassLoader specifiedLoader, boolean useContextClassLoader, java.lang.Class callingClass) Return the class loader to be used for instantiating application objects when required.
static java.lang.ClassLoader	getClassLoader(java.lang.ClassLoader specifiedLoader, java.lang.Class callingClass) Return the class loader to be used for instantiating application objects when a context class loader is not specified.
static java.lang.Class	loadClass(java.lang.String className, java.lang.Class callingClass) Loads the given class using the current Thread's context class loader first otherwise use the class loader which loaded this class.
static java.lang.Class	loadClass(java.lang.String className, java.lang.ClassLoader specifiedLoader, boolean useContextLoader, java.lang.Class callingClass) Loads the given class using: the specified classloader, the current Thread's context class loader first, if asked otherwise use the class loader which loaded this class.

Methods inherited from class java.lang.Object

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

Field Detail

log

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

log for debug etc output

Constructor Detail

ClassLoaderUtils

public ClassLoaderUtils()

Method Detail

getClassLoader

public static java.lang.ClassLoader getClassLoader(java.lang.ClassLoader specifiedLoader,
                                                   boolean useContextClassLoader,
                                                   java.lang.Class callingClass)

Return the class loader to be used for instantiating application objects when required. This is determined based upon the following rules:

• The specified class loader, if any
• The thread context class loader, if it exists and useContextClassLoader is true
• The class loader used to load the calling class.
• The System class loader.

getClassLoader

public static java.lang.ClassLoader getClassLoader(java.lang.ClassLoader specifiedLoader,
                                                   java.lang.Class callingClass)

Return the class loader to be used for instantiating application objects when a context class loader is not specified. This is determined based upon the following rules:

• The specified class loader, if any
• The class loader used to load the calling class.
• The System class loader.

getClassLoader

public static java.lang.ClassLoader getClassLoader(java.lang.Class clazz)

Get the loader for the given class.

Parameters:

clazz - the class to retrieve the loader for

Returns:

the class loader that loaded the provided class

loadClass

public static java.lang.Class loadClass(java.lang.String className,
                                        java.lang.Class callingClass)
                                 throws java.lang.ClassNotFoundException

Loads the given class using the current Thread's context class loader first otherwise use the class loader which loaded this class.

Throws:

java.lang.ClassNotFoundException

loadClass

public static java.lang.Class loadClass(java.lang.String className,
                                        java.lang.ClassLoader specifiedLoader,
                                        boolean useContextLoader,
                                        java.lang.Class callingClass)
                                 throws java.lang.ClassNotFoundException

Loads the given class using:

1. the specified classloader,
2. the current Thread's context class loader first, if asked
3. otherwise use the class loader which loaded this class.

Throws:

java.lang.ClassNotFoundException