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jdk.security.Permission

Abstract class for representing access to a system resource. All permissions have a name (whose interpretation depends on the subclass), as well as abstract functions for defining the semantics of the particular Permission subclass.

Most Permission objects also include an "actions" list that tells the actions that are permitted for the object. For example, for a java.io.FilePermission object, the permission name is the pathname of a file (or directory), and the actions list (such as "read, write") specifies which actions are granted for the specified file (or for files in the specified directory). The actions list is optional for Permission objects, such as java.lang.RuntimePermission, that don't need such a list; you either have the named permission (such as "system.exit") or you don't.

An important method that must be implemented by each subclass is the implies method to compare Permissions. Basically, "permission p1 implies permission p2" means that if one is granted permission p1, one is naturally granted permission p2. Thus, this is not an equality test, but rather more of a subset test.

Permission objects are similar to String objects in that they are immutable once they have been created. Subclasses should not provide methods that can change the state of a permission once it has been created.

Abstract class for representing access to a system resource.
All permissions have a name (whose interpretation depends on the subclass),
as well as abstract functions for defining the semantics of the
particular Permission subclass.

Most Permission objects also include an "actions" list that tells the actions
that are permitted for the object.  For example,
for a java.io.FilePermission object, the permission name is
the pathname of a file (or directory), and the actions list
(such as "read, write") specifies which actions are granted for the
specified file (or for files in the specified directory).
The actions list is optional for Permission objects, such as
java.lang.RuntimePermission,
that don't need such a list; you either have the named permission (such
as "system.exit") or you don't.

An important method that must be implemented by each subclass is
the implies method to compare Permissions. Basically,
"permission p1 implies permission p2" means that
if one is granted permission p1, one is naturally granted permission p2.
Thus, this is not an equality test, but rather more of a
subset test.

 Permission objects are similar to String objects in that they
are immutable once they have been created. Subclasses should not
provide methods that can change the state of a permission
once it has been created.
raw docstring

->permissionclj

(->permission name)

Constructor.

Constructs a permission with the specified name.

name - name of the Permission object being created. - java.lang.String

Constructor.

Constructs a permission with the specified name.

name - name of the Permission object being created. - `java.lang.String`
raw docstring

check-guardclj

(check-guard this object)

Implements the guard interface for a permission. The SecurityManager.checkPermission method is called, passing this permission object as the permission to check. Returns silently if access is granted. Otherwise, throws a SecurityException.

object - the object being guarded (currently ignored). - java.lang.Object

throws: java.lang.SecurityException - if a security manager exists and its checkPermission method doesn't allow access.

Implements the guard interface for a permission. The
 SecurityManager.checkPermission method is called,
 passing this permission object as the permission to check.
 Returns silently if access is granted. Otherwise, throws
 a SecurityException.

object - the object being guarded (currently ignored). - `java.lang.Object`

throws: java.lang.SecurityException - if a security manager exists and its checkPermission method doesn't allow access.
raw docstring

equalsclj

(equals this obj)

Checks two Permission objects for equality.

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

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

returns: true if both Permission objects are equivalent. - boolean

Checks two Permission objects for equality.

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

obj - the object we are testing for equality with this object. - `java.lang.Object`

returns: true if both Permission objects are equivalent. - `boolean`
raw docstring

get-actionsclj

(get-actions this)

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.

returns: the actions of this Permission. - java.lang.String

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.

returns: the actions of this Permission. - `java.lang.String`
raw docstring

get-nameclj

(get-name this)

Returns the name of this Permission. For example, in the case of a java.io.FilePermission, the name will be a pathname.

returns: the name of this Permission. - java.lang.String

Returns the name of this Permission.
 For example, in the case of a java.io.FilePermission,
 the name will be a pathname.

returns: the name of this Permission. - `java.lang.String`
raw docstring

hash-codeclj

(hash-code this)

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.

returns: a hash code value for this object. - int

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.

returns: a hash code value for this object. - `int`
raw docstring

impliesclj

(implies this 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.

The implies 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.

permission - the permission to check against. - java.security.Permission

returns: true if the specified permission is implied by this object, false if not. - boolean

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.

 The implies 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.

permission - the permission to check against. - `java.security.Permission`

returns: true if the specified permission is implied by this object,
 false if not. - `boolean`
raw docstring

new-permission-collectionclj

(new-permission-collection this)

Returns an empty PermissionCollection for a given Permission object, or null if one is not defined. Subclasses of class Permission should override this if they need to store their permissions in a particular PermissionCollection object in order to provide the correct semantics when the PermissionCollection.implies method is called. 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).

returns: a new PermissionCollection object for this type of Permission, or null if one is not defined. - java.security.PermissionCollection

Returns an empty PermissionCollection for a given Permission object, or null if
 one is not defined. Subclasses of class Permission should
 override this if they need to store their permissions in a particular
 PermissionCollection object in order to provide the correct semantics
 when the PermissionCollection.implies method is called.
 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).

returns: a new PermissionCollection object for this type of Permission, or
 null if one is not defined. - `java.security.PermissionCollection`
raw docstring

to-stringclj

(to-string this)

Returns a string describing this Permission. The convention is to specify the class name, the permission name, and the actions in the following format: '("ClassName" "name" "actions")', or '("ClassName" "name")' if actions list is null or empty.

returns: information about this Permission. - java.lang.String

Returns a string describing this Permission.  The convention is to
 specify the class name, the permission name, and the actions in
 the following format: '("ClassName" "name" "actions")', or
 '("ClassName" "name")' if actions list is null or empty.

returns: information about this Permission. - `java.lang.String`
raw docstring

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