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Java(TM) 2 Platform, Standard Edition, v1.2.2 API Specification: Class BasicPermission - JDK 5 Documentation v1.2.2, Java 2 SDK 英文文档

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java.security
Class BasicPermission

java.lang.Object
  |
  +--java.security.Permission
        |
        +--java.security.BasicPermission
Direct Known Subclasses:
AWTPermission, NetPermission, PropertyPermission, ReflectPermission, RuntimePermission, SecurityPermission, SerializablePermission
public abstract class BasicPermission
extends Permission
implements Serializable

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 at the end of the name, following a ".", or by itself, to signify a wildcard match. For example: "java.*" or "*" is valid, "*java" or "a*b" is 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.

See Also:
Permission, Permissions, PermissionCollection, RuntimePermission, SecurityPermission, PropertyPermission, AWTPermission, NetPermission, SecurityManager, Serialized Form

Constructor Summary
BasicPermission(String name)
          Creates a new BasicPermission with the specified name.
BasicPermission(String name, String actions)
          Creates a new BasicPermission object with the specified name.
 
Method Summary
 boolean equals(Object obj)
          Checks two BasicPermission objects for equality.
 String getActions()
          Returns the canonical string representation of the actions, which currently is the empty string "", since there are no actions for a BasicPermission.
 int hashCode()
          Returns the hash code value for this object.
 boolean implies(Permission p)
          Checks if the specified permission is "implied" by this object.
 PermissionCollection newPermissionCollection()
          Returns a new PermissionCollection object for storing BasicPermission 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

BasicPermission

public BasicPermission(String name)
Creates a new BasicPermission with the specified name. Name is the symbolic name of the permission, such as "setFactory", "print.queueJob", or "topLevelWindow", etc. An asterisk may appear at the end of the name, following a ".", or by itself, to signify a wildcard match.
Parameters:
name - the name of the BasicPermission.

BasicPermission

public BasicPermission(String name,
                       String actions)
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. This constructor exists for use by the Policy object to instantiate new Permission objects.
Parameters:
name - the name of the BasicPermission.
actions - ignored.
Method Detail

implies

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

More specifically, this method returns true if:

  • p's class is the same as this object's class, and

  • p's name equals or (in the case of wildcards) is implied by this object's name. For example, "a.b.*" implies "a.b.c".
Overrides:
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)
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.

Overrides:
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()
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.
Overrides:
hashCode in class Permission
Returns:
a hash code value for this object.

getActions

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

newPermissionCollection

public PermissionCollection newPermissionCollection()
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.
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