net.drijf.javaone
Class DelegatingCL

java.lang.Object
  |
  +--java.lang.ClassLoader
        |
        +--java.security.SecureClassLoader
              |
              +--java.net.URLClassLoader
                    |
                    +--net.drijf.javaone.DelegatingCL

public class DelegatingCL

extends java.net.URLClassLoader

Implements a class loader that uses the delegating policy to assign permissions. Furthermore, a class is checked for ClassLoadPermission during loading.

Author:

Otto Moerbeek

See Also:

ClassLoadPermission

Constructor Summary

DelegatingCL(java.net.URL[] urls, java.lang.ClassLoader parent, java.security.Policy policy)
Construct a new delegating URL classloader, given a policy.

Method Summary

protected java.lang.Class	findClass(java.lang.String name) Find a class, with an additional check on ClassLoadPermission.
protected java.security.PermissionCollection	getPermissions(java.security.CodeSource cs) Return the permission associated with a codesource according to the policy associated with this classloader.

Methods inherited from class java.net.URLClassLoader

addURL, definePackage, findResource, findResources, getURLs, newInstance, newInstance

Methods inherited from class java.security.SecureClassLoader

defineClass

Methods inherited from class java.lang.ClassLoader

defineClass, defineClass, defineClass, definePackage, findLibrary, findLoadedClass, findSystemClass, getPackage, getPackages, getParent, getResource, getResourceAsStream, getResources, getSystemClassLoader, getSystemResource, getSystemResourceAsStream, getSystemResources, loadClass, loadClass, resolveClass, setSigners

Methods inherited from class java.lang.Object

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

Constructor Detail

DelegatingCL

public DelegatingCL(java.net.URL[] urls,
                    java.lang.ClassLoader parent,
                    java.security.Policy policy)

Construct a new delegating URL classloader, given a policy.

Parameters:

urls - the urls to look for classes.

parent - the parent class loader.

policy - the policy to use when determining permissions.

Method Detail

findClass

protected java.lang.Class findClass(java.lang.String name)
                             throws java.lang.ClassNotFoundException

Find a class, with an additional check on ClassLoadPermission.

Overrides:

findClass in class java.net.URLClassLoader

Parameters:

name - the name of the class to load.

Returns:

a loaded Classobject.

Throws:

java.lang.ClassNotFoundException - if either the class could not be found, or the class is denied ClassLoadPermission.

See Also:

ClassLoadPermission

getPermissions

protected java.security.PermissionCollection getPermissions(java.security.CodeSource cs)

Return the permission associated with a codesource according to the policy associated with this classloader.

Overrides:

getPermissions in class java.net.URLClassLoader

Parameters:

cs - the code source to return the permissions for.

Returns:

the permission collection associated with the code source according to the policy.