net.jini.loader

Class DownloadPermission

java.lang.Object

java.security.Permission

java.security.BasicPermission

net.jini.loader.DownloadPermission

All Implemented Interfaces:

Serializable, Guard

public final class DownloadPermission
extends BasicPermission

Permission that must be granted to the CodeSource of a downloaded class in order for the class to be defined using RMIClassLoader.

A DownloadPermission contains a name (also referred to as a "target name") but no action list; you either have the named permission or you don't. The only defined target name is "permit", which allows a downloaded class with a CodeSource that is granted the permission to be defined by a class loader created by RMIClassLoader.

Selective granting of this permission can be used to restrict the CodeSource values (codebase URLs and signers) from which downloaded classes can be defined using RMIClassLoader.

Note that this permission is only enforced if the current RMIClassLoader provider supports it; not all RMIClassLoader providers support this permission. In particular, the default provider (see RMIClassLoader.getDefaultProviderInstance) does not support this permission, and so when the default provider is used, downloaded classes do not need to be granted DownloadPermission in order to be defined using RMIClassLoader. PreferredClassProvider itself does not enforce this permission, but subclasses may configure it to do so (see RequireDlPermProvider).

Since:

2.0

Author:

Sun Microsystems, Inc.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
DownloadPermission() Creates a new DownloadPermission with the name "permit".

Method Summary

Methods inherited from class java.security.BasicPermission

equals, getActions, hashCode, implies, newPermissionCollection

Methods inherited from class java.security.Permission

checkGuard, getName, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

DownloadPermission

public DownloadPermission()

Creates a new DownloadPermission with the name "permit".