An AccessControlContext is used to make system resource access decisions based on the context it encapsulates.
More specifically, it encapsulates a context and
has a single method,
that is equivalent to the
in the AccessController class, with one difference: The AccessControlContext
checkPermission method makes access decisions based on the
context it encapsulates,
rather than that of the current execution thread.
Thus, the purpose of AccessControlContext is for those situations where a security check that should be made within a given context actually needs to be done from within a different context (for example, from within a worker thread).
An AccessControlContext is created by calling the
getContext method takes a "snapshot"
of the current calling context, and places
it in an AccessControlContext object, which it returns. A sample call is
AccessControlContext acc = AccessController.getContext()
Code within a different context can subsequently call the
checkPermission method on the
previously-saved AccessControlContext object. A sample call is the
Create an AccessControlContext with the given set of ProtectionDomains.
Create a new
Determines whether the access request indicated by the specified permission should be allowed or denied, based on the security policy currently in effect, and the context in this object.
Checks two AccessControlContext objects for equality.
Returns the hash code value for this context.
Create an AccessControlContext with the given set of ProtectionDomains. Context must not be null. Duplicate domains will be removed from the context.
|context||the ProtectionDomains associated with this context. The non-duplicate domains are copied from the array. Subsequent changes to the array will not affect this AccessControlContext.|
Create a new
AccessControlContext with the given
This constructor associates the provided
DomainCombiner with the provided
Determines whether the access request indicated by the specified permission should be allowed or denied, based on the security policy currently in effect, and the context in this object. The request is allowed only if every ProtectionDomain in the context implies the permission. Otherwise the request is denied.
This method quietly returns if the access request is permitted, or throws a suitable AccessControlException otherwise.
|perm||the requested permission.|
Checks two AccessControlContext objects for equality. Checks that obj is an AccessControlContext and has the same set of ProtectionDomains as this context.
|obj||the object we are testing for equality with this object.|
Returns the hash code value for this context. The hash code is computed by exclusive or-ing the hash code of all the protection domains in the context together.