org.apache.xbean.classloader
Class JarFileClassLoader

java.lang.Object
  java.lang.ClassLoader
      java.security.SecureClassLoader
          java.net.URLClassLoader
              org.apache.xbean.classloader.NamedClassLoader
                  org.apache.xbean.classloader.MultiParentClassLoader
                      org.apache.xbean.classloader.JarFileClassLoader

All Implemented Interfaces:

DestroyableClassLoader

public class JarFileClassLoader
extends MultiParentClassLoader

The JarFileClassLoader that loads classes and resources from a list of JarFiles. This method is simmilar to URLClassLoader except it properly closes JarFiles when the classloader is destroyed so that the file read lock will be released, and the jar file can be modified and deleted.

Note: This implementation currently does not work reliably on windows, since the jar URL handler included with the Sun JavaVM holds a read lock on the JarFile, and this lock is not released when the jar url is dereferenced. To fix this a replacement for the jar url handler must be written.

Since:

2.0

Version:

$Id: JarFileClassLoader.java 437551 2006-08-28 06:14:47Z adc $

Author:

Dain Sundstrom

Constructor Summary

JarFileClassLoader(String name, URL[] urls)
Creates a JarFileClassLoader that is a child of the system class loader.

JarFileClassLoader(String name, URL[] urls, ClassLoader parent)
Creates a JarFileClassLoader that is a child of the specified class loader.

JarFileClassLoader(String name, URL[] urls, ClassLoader[] parents)
Creates a named class loader as a child of the specified parents.

JarFileClassLoader(String name, URL[] urls, ClassLoader[] parents, boolean inverseClassLoading, Collection hiddenClasses, Collection nonOverridableClasses)

JarFileClassLoader(String name, URL[] urls, ClassLoader[] parents, boolean inverseClassLoading, String[] hiddenClasses, String[] nonOverridableClasses)

JarFileClassLoader(String name, URL[] urls, ClassLoader parent, boolean inverseClassLoading, String[] hiddenClasses, String[] nonOverridableClasses)

Method Summary

void	addURL(URL url)
protected void	addURLs(URL[] urls) Adds an array of urls to the end of this class loader.
void	destroy() Destroys the clasloader releasing all resources. After this mehtod is called, the class loader will no longer load any classes or resources.
protected Class	findClass(String className)
protected String	findLibrary(String libraryName)
URL	findResource(String resourceName)
Enumeration	findResources(String resourceName)
URL[]	getURLs()

Methods inherited from class org.apache.xbean.classloader.MultiParentClassLoader

getParents, getResource, loadClass, toString

Methods inherited from class org.apache.xbean.classloader.NamedClassLoader

getName, isDestroyed

Methods inherited from class java.net.URLClassLoader

definePackage, getPermissions, newInstance, newInstance

Methods inherited from class java.security.SecureClassLoader

defineClass, defineClass

Methods inherited from class java.lang.ClassLoader

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

Methods inherited from class java.lang.Object

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

Constructor Detail

JarFileClassLoader

public JarFileClassLoader(String name,
                          URL[] urls)

Creates a JarFileClassLoader that is a child of the system class loader.

Parameters:

name - the name of this class loader

urls - a list of URLs from which classes and resources should be loaded

JarFileClassLoader

public JarFileClassLoader(String name,
                          URL[] urls,
                          ClassLoader parent)

Creates a JarFileClassLoader that is a child of the specified class loader.

Parameters:

name - the name of this class loader

urls - a list of URLs from which classes and resources should be loaded

parent - the parent of this class loader

JarFileClassLoader

public JarFileClassLoader(String name,
                          URL[] urls,
                          ClassLoader parent,
                          boolean inverseClassLoading,
                          String[] hiddenClasses,
                          String[] nonOverridableClasses)

JarFileClassLoader

public JarFileClassLoader(String name,
                          URL[] urls,
                          ClassLoader[] parents)

Creates a named class loader as a child of the specified parents.

Parameters:

name - the name of this class loader

urls - the urls from which this class loader will classes and resources

parents - the parents of this class loader

JarFileClassLoader

public JarFileClassLoader(String name,
                          URL[] urls,
                          ClassLoader[] parents,
                          boolean inverseClassLoading,
                          Collection hiddenClasses,
                          Collection nonOverridableClasses)

JarFileClassLoader

public JarFileClassLoader(String name,
                          URL[] urls,
                          ClassLoader[] parents,
                          boolean inverseClassLoading,
                          String[] hiddenClasses,
                          String[] nonOverridableClasses)

Method Detail

getURLs

public URL[] getURLs()

Overrides:

getURLs in class URLClassLoader

addURL

public void addURL(URL url)

Overrides:

addURL in class URLClassLoader

addURLs

protected void addURLs(URL[] urls)

Adds an array of urls to the end of this class loader.

Parameters:

urls - the URLs to add

destroy

public void destroy()

Destroys the clasloader releasing all resources. After this mehtod is called, the class loader will no longer load any classes or resources.

Specified by:

destroy in interface DestroyableClassLoader

Overrides:

destroy in class NamedClassLoader

findResource

public URL findResource(String resourceName)

Overrides:

findResource in class URLClassLoader

findResources

public Enumeration findResources(String resourceName)
                          throws IOException

Overrides:

findResources in class MultiParentClassLoader

Throws:

IOException

findLibrary

protected String findLibrary(String libraryName)

Overrides:

findLibrary in class ClassLoader

findClass

protected Class findClass(String className)
                   throws ClassNotFoundException

Overrides:

findClass in class URLClassLoader

Throws:

ClassNotFoundException