javax.realtime.device

Class HappeningPermission

java.lang.Object

java.security.Permission

javax.realtime.RealtimePermission

javax.realtime.device.HappeningPermission

All Implemented Interfaces:

java.io.Serializable, java.security.Guard

public class HappeningPermission
extends RealtimePermission

The device management module provides a permission for the security manager to control happenings. The following table describes the actions to check. For all but create, which takes no arguments, either the permission is limited to the current ThreadGroup by specifying the target group or it can apply to all, either with no target or with the target *.

Action Name	Description	Risks of grant
create	Enables new thread, timers, and tasks to be created.	Scheduling Risk
handle	Allows adding a handler to a Happening.	Load Risk
override	Enables handlers to be removed.	Interference Risk
system	Changes system's wide happening behavior.	Scheduling and Load Risk

The risk classes are defined in RealtimePermission.

Since:

RTSJ 2.0

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
HappeningPermission(java.lang.String actions) Creates a new HappeningPermission object for a given action, i.e., the symbolic name of an action.
HappeningPermission(java.lang.String target, java.lang.String actions) Creates a new HappeningPermission 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.
java.lang.String	getActions() Obtain the actions as a String in canonical form.
int	hashCode() Obtain the hash code value for this object.
boolean	implies(java.security.Permission permission) Checks if the given permission's actions are "implied by" this object's actions.

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

HappeningPermission

public HappeningPermission(java.lang.String target,
                           java.lang.String actions)

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

Parameters:

target - Specifies the domain for the action, or * 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.

HappeningPermission

public HappeningPermission(java.lang.String actions)

Creates a new HappeningPermission 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.

getActions

public java.lang.String getActions()

Description copied from class: RealtimePermission

Obtain the actions as a String in canonical form.

Overrides:

getActions in class RealtimePermission

Returns:

the actions represented as a string.

hashCode

public int hashCode()

Description copied from class: RealtimePermission

Obtain the hash code value for this object.

Overrides:

hashCode in class RealtimePermission

Returns:

the hash code value.

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.