java.security
Class BasicPermission

java.lang.Object
  |
  +--java.security.Permission
        |
        +--java.security.BasicPermission
All Implemented Interfaces:
Guard, Serializable
Direct Known Subclasses:
AWTPermission, NetPermission, PropertyPermission, RuntimePermission, SecurityPermission, SerializablePermission

public abstract class BasicPermission
extends Permission
implements Serializable

Untamed: The BasicPermission class extends the Permission class, and can be used as the base class for permissions that want to follow the same naming convention as BasicPermission.

The name for a BasicPermission is the name of the given permission (for example, "exit", "setFactory", "print.queueJob", etc). The naming convention follows the hierarchical property naming convention. An asterisk may appear by itself, or if immediately preceded by a "." may appear at the end of the name, to signify a wildcard match. For example, "*" and "java.*" are valid, while "*java", "a*b", and "java*" are not valid.

The action string (inherited from Permission) is unused. Thus, BasicPermission is commonly used as the base class for "named" permissions (ones that contain a name but no actions list; you either have the named permission or you don't.) Subclasses may implement actions on top of BasicPermission, if desired.

Version:
1.33 02/02/01
Author:
Marianne Mueller, Roland Schemers
See Also:
java.security.Permission, java.security.Permissions, java.security.PermissionCollection, java.lang.RuntimePermission, java.security.SecurityPermission, java.util.PropertyPermission, java.awt.AWTPermission, java.net.NetPermission, java.lang.SecurityManager, Serialized Form

Field Summary
private  String path
           
private  boolean wildcard
           
 
Fields inherited from class java.security.Permission
 
Constructor Summary
BasicPermission(String name)
          Enabled: Creates a new BasicPermission with the specified name.
BasicPermission(String name, String actions)
          Enabled: Creates a new BasicPermission object with the specified name.
 
Method Summary
 boolean equals(Object obj)
          Suppressed: Checks two BasicPermission objects for equality.
 String getActions()
          Enabled: Returns the canonical string representation of the actions, which currently is the empty string "", since there are no actions for a BasicPermission.
 int hashCode()
          Suppressed: Returns the hash code value for this object.
 boolean implies(Permission p)
          Enabled: Checks if the specified permission is "implied" by this object.
private  void init(String name)
          initialize a BasicPermission object.
 PermissionCollection newPermissionCollection()
          Enabled: Returns a new PermissionCollection object for storing BasicPermission objects.
private  void readObject(ObjectInputStream s)
          readObject is called to restore the state of the BasicPermission from a stream.
 
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
 

Field Detail

wildcard

private transient boolean wildcard

path

private transient String path
Constructor Detail

BasicPermission

public BasicPermission(String name)
Enabled: Creates a new BasicPermission with the specified name. Name is the symbolic name of the permission, such as "setFactory", "print.queueJob", or "topLevelWindow", etc.

Parameters:
name - the name of the BasicPermission.
Throws:
NullPointerException - if name is null.
IllegalArgumentException - if name is empty.

BasicPermission

public BasicPermission(String name,
                       String actions)
Enabled: Creates a new BasicPermission object with the specified name. The name is the symbolic name of the BasicPermission, and the actions String is currently unused.

Parameters:
name - the name of the BasicPermission.
actions - ignored.
Throws:
NullPointerException - if name is null.
IllegalArgumentException - if name is empty.
Method Detail

init

private void init(String name)
initialize a BasicPermission object. Common to all constructors.


implies

public boolean implies(Permission p)
Enabled: Checks if the specified permission is "implied" by this object.

More specifically, this method returns true if:

Specified by:
implies in class Permission
Parameters:
p - the permission to check against.
Returns:
true if the passed permission is equal to or implied by this permission, false otherwise.

equals

public boolean equals(Object obj)
Suppressed: Checks two BasicPermission objects for equality. Checks that obj's class is the same as this object's class and has the same name as this object.

Specified by:
equals in class Permission
Parameters:
obj - the object we are testing for equality with this object.
Returns:
true if obj is a BasicPermission, and has the same name as this BasicPermission object, false otherwise.

hashCode

public int hashCode()
Suppressed: Returns the hash code value for this object. The hash code used is the hash code of the name, that is, getName().hashCode(), where getName is from the Permission superclass.

Specified by:
hashCode in class Permission
Returns:
a hash code value for this object.

getActions

public String getActions()
Enabled: Returns the canonical string representation of the actions, which currently is the empty string "", since there are no actions for a BasicPermission.

Specified by:
getActions in class Permission
Returns:
the empty string "".

newPermissionCollection

public PermissionCollection newPermissionCollection()
Enabled: Returns a new PermissionCollection object for storing BasicPermission objects.

A BasicPermissionCollection stores a collection of BasicPermission permissions.

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

Overrides:
newPermissionCollection in class Permission
Returns:
a new PermissionCollection object suitable for storing BasicPermissions.

readObject

private void readObject(ObjectInputStream s)
                 throws IOException,
                        ClassNotFoundException
readObject is called to restore the state of the BasicPermission from a stream.

IOException
ClassNotFoundException


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