jdk.dio.spibus

Class SPIPermission

java.lang.Object

java.security.Permission

jdk.dio.DevicePermission

jdk.dio.spibus.SPIPermission

All Implemented Interfaces:

java.io.Serializable, java.security.Guard

public class SPIPermission
extends DevicePermission

The SPIPermission class defines permissions for SPI slave device access.

A SPIPermission permission has a target name and a list of actions.

The target name contains hardware addressing information. The format is the one defined for the base DevicePermission class with the following addition:

{channel-desc}

The {channel-desc} string (described in DevicePermission) is the hexadecimal string representation of a device address on the SPI bus as may be returned by a call to SPIDeviceConfig.getAddress. The characters in the string must all be hexadecimal digits.

The supported actions are open and powermanage. Their meaning is defined as follows:

open

open and access an SPI slave device functions (see DeviceManager.open)

powermanage

manage the power saving mode of a device (see PowerManaged)

See Also:

DeviceManager.open, PowerManaged, Serialized Form

Field Summary

Fields inherited from class jdk.dio.DevicePermission

OPEN, POWER_MANAGE

Constructor Summary

Constructors

Constructor and Description
SPIPermission(java.lang.String name) Constructs a new ADCPermission with the specified target name and the implicit open action.
SPIPermission(java.lang.String name, java.lang.String actions) Constructs a new SPIPermission instance with the specified target name and action list.

Method Summary

Methods

Modifier and Type	Method and Description
boolean	equals(java.lang.Object obj) Checks two SPIPermission objects for equality.
java.lang.String	getActions() Returns the list of possible actions in the following order: open or powermanage.
int	hashCode() Returns the hash code value for this object.
boolean	implies(java.security.Permission permission) Checks if this SPIPermission object "implies" the specified permission.
java.security.PermissionCollection	newPermissionCollection() Returns a new PermissionCollection for storing SPIPermission objects.

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

SPIPermission

public SPIPermission(java.lang.String name)

Constructs a new ADCPermission with the specified target name and the implicit open action.

Parameters:

name - the target name (as defined above).

Throws:

java.lang.NullPointerException - if name is null.

See Also:

getName

SPIPermission

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

Constructs a new SPIPermission instance with the specified target name and action list.

Parameters:

name - the target name (as defined above).

actions - comma-separated list of device operations: open or powermanage.

Throws:

java.lang.NullPointerException - if name is null.

java.lang.IllegalArgumentException - if actions is null, empty or contains an action other than the specified possible actions.

See Also:

getName

Method Detail

equals

public boolean equals(java.lang.Object obj)

Checks two SPIPermission objects for equality.

Overrides:

equals in class DevicePermission

Parameters:

obj - the object to test for equality with this object.

Returns:

true if obj is a SPIPermission and has the same target name and actions as this SPIPermission object.

getActions

public java.lang.String getActions()

Returns the list of possible actions in the following order: open or powermanage.

Overrides:

getActions in class DevicePermission

Returns:

comma-separated list of possible actions.

hashCode

public int hashCode()

Returns the hash code value for this object.

Overrides:

hashCode in class DevicePermission

Returns:

a hash code value for this object.

implies

public boolean implies(java.security.Permission permission)

Checks if this SPIPermission object "implies" the specified permission.

More specifically, this method returns true if:

• permission is an instance of SPIPermission, and
• permission's actions are a proper subset of this object's action list, and
• permission's hardware addressing information or range thereof is included in this SPIPermission's hardware addressing information range.

Overrides:

implies in class DevicePermission

Parameters:

permission - the permission to check against.

Returns:

true if the specified permission is not null and is implied by this object, false otherwise.

newPermissionCollection

public java.security.PermissionCollection newPermissionCollection()

Returns a new PermissionCollection for storing SPIPermission objects.

SPIPermission objects must be stored in a manner that allows them to be inserted into the collection in any order, but that also enables the PermissionCollection implies method to be implemented in an efficient (and consistent) manner.

If null is returned, then the caller of this method is free to store permissions of this type in any PermissionCollection they choose (one that uses a Hashtable, one that uses a Vector, etc).

Overrides:

newPermissionCollection in class DevicePermission

Returns:

a new PermissionCollection suitable for storing SPIPermission objects, or null if one is not defined.