org.jboss.util.loading

Class DelegatingClassLoader

java.lang.Object

java.lang.ClassLoader

java.security.SecureClassLoader

java.net.URLClassLoader

org.jboss.util.loading.DelegatingClassLoader

All Implemented Interfaces:

java.io.Closeable, java.lang.AutoCloseable

public class DelegatingClassLoader
extends java.net.URLClassLoader

A URL classloader that delegates to its parent, avoiding synchronization. A standard flag is provided so it can be used as a parent class, but later subclassed and to revert to standard class loading if the subclass wants to load classes.

Version:

$Revision$

Field Summary

Fields

Modifier and Type	Field and Description
static java.net.URL[]	EMPTY_URL_ARRAY The value returned by URLClassLoader.getURLs().
private java.lang.ClassLoader	parent Cache the parent
protected boolean	standard Whether to use standard loading

Constructor Summary

Constructors

Constructor and Description
DelegatingClassLoader(java.lang.ClassLoader parent) Constructor
DelegatingClassLoader(java.lang.ClassLoader parent, java.net.URLStreamHandlerFactory factory) Constructor

Method Summary

Modifier and Type	Method and Description
protected java.lang.Class<?>	loadClass(java.lang.String className, boolean resolve) Load a class, by asking the parent

Methods inherited from class java.net.URLClassLoader

addURL, close, definePackage, findClass, findResource, findResources, getPermissions, getResourceAsStream, getURLs, newInstance, newInstance

Methods inherited from class java.security.SecureClassLoader

defineClass, defineClass

Methods inherited from class java.lang.ClassLoader

clearAssertionStatus, defineClass, defineClass, defineClass, defineClass, definePackage, findLibrary, findLoadedClass, findSystemClass, getClassLoadingLock, getPackage, getPackages, getParent, getResource, getResources, getSystemClassLoader, getSystemResource, getSystemResourceAsStream, getSystemResources, loadClass, registerAsParallelCapable, resolveClass, setClassAssertionStatus, setDefaultAssertionStatus, setPackageAssertionStatus, setSigners

Methods inherited from class java.lang.Object

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

Field Detail

EMPTY_URL_ARRAY

public static final java.net.URL[] EMPTY_URL_ARRAY

The value returned by URLClassLoader.getURLs().

standard

protected boolean standard

Whether to use standard loading

parent

private java.lang.ClassLoader parent

Cache the parent

Constructor Detail

DelegatingClassLoader

public DelegatingClassLoader(java.lang.ClassLoader parent)

Constructor

Parameters:

parent - the parent classloader, cannot be null.

DelegatingClassLoader

public DelegatingClassLoader(java.lang.ClassLoader parent,
                             java.net.URLStreamHandlerFactory factory)

Constructor

Parameters:

parent - the parent classloader, cannot be null.

factory - the url stream factory.

Method Detail

loadClass

protected java.lang.Class<?> loadClass(java.lang.String className,
                                       boolean resolve)
                                throws java.lang.ClassNotFoundException

Load a class, by asking the parent

Overrides:

loadClass in class java.lang.ClassLoader

Parameters:

className - the class name to load

resolve - whether to link the class

Returns:

the loaded class

Throws:

java.lang.ClassNotFoundException - when the class could not be found