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JavaTM 2 Platform Standard Edition |
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java.lang.Object | +--java.security.PermissionCollection | +--java.security.Permissions
This class represents a heterogeneous collection of Permissions. That is,
it contains different types of Permission objects, organized into
PermissionCollections. For example, if any java.io.FilePermission
objects are added to an instance of this class, they are all stored in a single
PermissionCollection. It is the PermissionCollection returned by a call to
the newPermissionCollection
method in the FilePermission class.
Similarly, any java.lang.RuntimePermission
objects are stored in
the PermissionCollection returned by a call to the
newPermissionCollection
method in the
RuntimePermission class. Thus, this class represents a collection of
PermissionCollections.
When the add
method is called to add a Permission, the
Permission is stored in the appropriate PermissionCollection. If no such
collection exists yet, the Permission object's class is determined and the
newPermissionCollection
method is called on that class to create
the PermissionCollection and add it to the Permissions object. If
newPermissionCollection
returns null, then a default
PermissionCollection that uses a hashtable will be created and used. Each
hashtable entry stores a Permission object as both the key and the value.
Permission
,
PermissionCollection
,
AllPermission
, Serialized FormConstructor Summary | |
Permissions()
Creates a new Permissions object containing no PermissionCollections. |
Method Summary | |
void |
add(Permission permission)
Adds a permission object to the PermissionCollection for the class the permission belongs to. |
Enumeration |
elements()
Returns an enumeration of all the Permission objects in all the PermissionCollections in this Permissions object. |
boolean |
implies(Permission permission)
Checks to see if this object's PermissionCollection for permissions of the specified permission's type implies the permissions expressed in the permission object. |
Methods inherited from class java.security.PermissionCollection |
isReadOnly,
setReadOnly,
toString |
Methods inherited from class java.lang.Object |
clone,
equals,
finalize,
getClass,
hashCode,
notify,
notifyAll,
wait,
wait,
wait |
Constructor Detail |
public Permissions()
Method Detail |
public void add(Permission permission)
permission
- the Permission object to add.isReadOnly
public boolean implies(Permission permission)
For example, suppose there is a FilePermissionCollection in this Permissions
object, and it contains one FilePermission that specifies "read" access for
all files in all subdirectories of the "/tmp" directory, and another
FilePermission that specifies "write" access for all files in the
"/tmp/scratch/foo" directory. Then if the implies
method
is called with a permission specifying both "read" and "write" access
to files in the "/tmp/scratch/foo" directory, true
is returned.
Additionally, if this PermissionCollection contains the AllPermission, this method will always return true.
permission
- the Permission object to check.public Enumeration elements()
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