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java.lang.Objectjava.security.Permission
@TransactionType(value=NOT_SUPPORTED) public abstract class 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
javacardx.io.ConnectorPermission
object, the permission name
is the URL 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
javacardx.framework.JCRuntimePermission
, that don't need such
a list; you either have the named permission (such as "thread.create") 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.
This Java Card class is a subset of the CDC 1.1 Permission class. Some interfaces, methods and/or variables have been pruned, and/or other methods simplified, in an effort to reduce the size of this class and/or eliminate dependencies on unsupported features.
Constructor Summary | |
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Permission(String name)
Constructs a permission with the specified name. |
Method Summary | |
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abstract boolean |
equals(Object obj)
Checks two Permission objects for equality. |
abstract String |
getActions()
Returns the actions as a String. |
String |
getName()
Returns the name of this Permission. |
abstract int |
hashCode()
Returns the hash code value for this Permission object. |
abstract boolean |
implies(Permission permission)
Checks if the specified permission's actions are "implied by" this object's actions. |
String |
toString()
Returns a string describing this Permission. |
Methods inherited from class java.lang.Object |
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getClass, notify, notifyAll, wait, wait, wait |
Constructor Detail |
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public Permission(String name)
name
- name of the Permission object being created.Method Detail |
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public abstract boolean implies(Permission permission)
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.
public abstract boolean equals(Object obj)
Do not use the equals
method for making access control
decisions; use the implies
method.
equals
in class Object
obj
- the object we are testing for equality with this object.
Boolean.hashCode()
,
Hashtable
public abstract int hashCode()
The required hashCode
behavior for Permission Objects is
the following:
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.
equals
method, then calling the hashCode
method on each of the two Permission objects must produce the same
integer result.
hashCode
in class Object
Object.equals(java.lang.Object)
,
Hashtable
public final String getName()
javacardx.io.ConnectorPermission
, the name will be a
pathname.
public abstract String getActions()
perm1 = new ConnectorPermission(p1, "read,write"); perm2 = new ConnectorPermission(p2, "write,read");both return "read,write" when the
getActions
method is
invoked.
public String toString()
toString
in class Object
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