Package ej.service

Class ServicePermission

java.lang.Object

java.security.Permission

ej.service.ServicePermission

All Implemented Interfaces:

Serializable, Guard

public class ServicePermission
extends Permission

Permission to manipulate services using ServiceLoader.getService(Class) or ServiceRegistry.register(Class, Object) or ServiceRegistry.unregister(Class, Object).

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
static String	GET_ACTION	Action associated with ServiceLoader.getService(Class).
static String	REGISTER_ACTION	Action associated with ServiceRegistry.register(Class, Object).
static String	UNREGISTER_ACTION	Action associated with ServiceRegistry.unregister(Class, Object).

Constructor Summary

Constructors

Constructor	Description
ServicePermission(String parentName, Class<?> service, String action)	Creates a permission for the given service.

Method Summary

Modifier and Type	Method	Description
boolean	equals(Object obj)	Checks two Permission objects for equality.
String	getActions()	Returns the actions as a String.
Class<?>	getService()	Gets the service handled by this permission.
int	hashCode()	Returns the hash code value for this Permission object.
boolean	implies(Permission permission)	Checks if the specified permission's actions are "implied by" this object's actions.

Methods inherited from class java.security.Permission

getName, toString

Methods inherited from class java.lang.Object

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

Field Detail

GET_ACTION

public static final String GET_ACTION

Action associated with ServiceLoader.getService(Class).

See Also:

Constant Field Values

REGISTER_ACTION

public static final String REGISTER_ACTION

Action associated with ServiceRegistry.register(Class, Object).

See Also:

Constant Field Values

UNREGISTER_ACTION

public static final String UNREGISTER_ACTION

Action associated with ServiceRegistry.unregister(Class, Object).

See Also:

Constant Field Values

Constructor Detail

ServicePermission

public ServicePermission(String parentName,
                         Class<?> service,
                         String action)

Creates a permission for the given service.

The action can be one of GET_ACTION, REGISTER_ACTION or UNREGISTER_ACTION.

Parameters:

parentName - the name of the service loader or service registry.

service - the service.

action - the action realized with the service.

Method Detail

getActions

public String getActions()

Description copied from class: Permission

Returns the actions as a String. This is abstract so subclasses can defer creating a String representation until one is needed. Subclasses should always return actions in what they consider to be their canonical form. For example, two FilePermission objects created via the following:

 perm1 = new FilePermission(p1, "read,write");
 perm2 = new FilePermission(p2, "write,read");
 

both return "read,write" when the getActions method is invoked.

Specified by:

getActions in class Permission

Returns:

the actions of this Permission.

getService

public Class<?> getService()

Gets the service handled by this permission.

Returns:

the service.

equals

public boolean equals(@Nullable
                      Object obj)

Description copied from class: Permission

Checks two Permission objects for equality.

Do not use the equals method for making access control decisions; use the implies method.

Specified by:

equals in class Permission

Parameters:

obj - the object we are testing for equality with this object.

Returns:

true if both Permission objects are equivalent.

See Also:

Object.hashCode(), HashMap

hashCode

public int hashCode()

Description copied from class: Permission

Returns the hash code value for this Permission object.

The required hashCode behavior for Permission Objects is the following:

• Whenever it is invoked on the same Permission object more than once during an execution of a Java application, the hashCode method must consistently return the same integer. This integer need not remain consistent from one execution of an application to another execution of the same application.
• If two Permission objects are equal according to the equals method, then calling the hashCode method on each of the two Permission objects must produce the same integer result.

Specified by:

hashCode in class Permission

Returns:

a hash code value for this object.

See Also:

Object.equals(java.lang.Object), System.identityHashCode(java.lang.Object)

implies

public boolean implies(@Nullable
                       Permission permission)

Description copied from class: Permission

Checks if the specified permission's actions are "implied by" this object's actions.

This must be implemented by subclasses of Permission, as they are the only ones that can impose semantics on a Permission object.

Specified by:

implies in class Permission

Parameters:

permission - the permission to check against.

Returns:

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