javax.realtime

Class TaskPermission

java.lang.Object

java.security.Permission

javax.realtime.RealtimePermission

javax.realtime.TaskPermission

All Implemented Interfaces:

java.io.Serializable, java.security.Guard

public class TaskPermission
extends RealtimePermission

Task permissions are for controlling threads and handlers, as well as creating clocks. The following table describes the actions to check. For all but create, which takes no name, either the permission is limited to the current ThreadGroup by specifying the name group, or it can apply to all with no name or the name *.

Action Name	Description	Risks of grant
control	Enables controlling the activity of a task.	Scheduling Risk
create	Enables new thread, timers, and tasks to be created.	Scheduling Risk
handle	Adds handler to an asynchronous event.	Load Risk
override	Interference Risk.
system	Changes system wide tasking behavior.	Load and Scheduling Risk

The risk classes are defined in RealtimePermission.

Since:

RTSJ 2.0

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
TaskPermission(java.lang.String actions) Creates a new TaskPermission object for a given action, i.e., the symbolic name of an action.
TaskPermission(java.lang.String name, java.lang.String actions) Creates a new TaskPermission object for a given action, i.e., the symbolic name of an action.
TaskPermission(java.lang.ThreadGroup group, java.lang.String actions) Creates a new TaskPermission object for a given action, i.e., the symbolic name of an action.

Method Summary

Modifier and Type	Method and Description
boolean	equals(java.lang.Object other) Compare two Permission objects for equality.
boolean	implies(java.security.Permission permission) Checks if the given permission's actions are "implied by" this object's actions.

Methods inherited from class javax.realtime.RealtimePermission

getActions, hashCode, setHashCode

Methods inherited from class java.security.Permission

checkGuard, getName, newPermissionCollection, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

TaskPermission

public TaskPermission(java.lang.String name,
                      java.lang.String actions)

Creates a new TaskPermission object for a given action, i.e., the symbolic name of an action. The name string specifies additional limitations on the action.

Parameters:

name - Specifies the domain for the action, or * or null for no limit on the permission.

actions - The names of the actions to allow, or * for all actions.

Throws:

java.lang.NullPointerException - when action is null.

StaticIllegalArgumentException - when target or action is empty.

TaskPermission

public TaskPermission(java.lang.ThreadGroup group,
                      java.lang.String actions)

Creates a new TaskPermission object for a given action, i.e., the symbolic name of an action. The group parameter specifies the thread group that will be compared to the current thread group when implies is called.

Parameters:

group - Specifies the thread group that will be compared to the current thread group when implies is called.

actions - The names of the actions to allow, or * for all actions.

Throws:

java.lang.NullPointerException - when action is null.

StaticIllegalArgumentException - when group is null or action is empty.

TaskPermission

public TaskPermission(java.lang.String actions)

Creates a new TaskPermission object for a given action, i.e., the symbolic name of an action.

Parameters:

actions - The names of the actions to allow, or * for all actions.

Throws:

java.lang.NullPointerException - when action is null.

StaticIllegalArgumentException - when action is empty.

Method Detail

equals

public boolean equals(java.lang.Object other)

Description copied from class: RealtimePermission

Compare two Permission objects for equality.

Overrides:

equals in class RealtimePermission

Parameters:

other - is the object with which to compare.

Returns:

true when yes and false otherwise.

implies

public boolean implies(java.security.Permission permission)

Description copied from class: RealtimePermission

Checks if the given permission's actions are "implied by" this object's actions. This method is used by the AccessController to determine whether or not a requested permission is implied by another permission that is known to be valid in the current execution context.

Overrides:

implies in class RealtimePermission

Parameters:

permission - is the permission to check.

Returns:

true when yes and false otherwise.