java.lang.Object java.security.PermissionCollection java.security.Permissions
public final class 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.
Enumerations returned via the elements method are not fail-fast. Modifications to a collection should not be performed while enumerating over that collection.
Constructor Summary | |
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Permissions
() Creates a new Permissions object containing no PermissionCollections. |
Method Summary | |
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void |
add
(
Permission
permission) Adds a permission object to the PermissionCollection for the class the permission belongs to. |
Enumeration < Permission > |
elements
() Returns an enumeration of all the Permission objects in all the PermissionCollections in this Permissions object. |
boolean |
implies
(
Permission
Checks to see if this object's PermissionCollection for permissions of the specified permission's class |
Methods inherited from class java.security. PermissionCollection |
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isReadOnly , setReadOnly , toString |
Methods inherited from class java.lang. Object |
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clone , equals , finalize , getClass , hashCode , notify , notifyAll , wait , wait , wait |
Constructor Detail |
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public Permissions()
Method Detail |
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public void add(Permission permission)
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.
public Enumeration<Permission> elements()