Class Permissions
- java.lang.Object
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- java.security.PermissionCollection
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- java.security.Permissions
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- All Implemented Interfaces:
- Serializable
public final class Permissions extends PermissionCollection implements Serializable
This class represents a heterogeneous collection of Permissions. That is, it contains different types of Permission objects, organized into PermissionCollections. For example, if anyjava.io.FilePermissionobjects 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 thenewPermissionCollectionmethod in the FilePermission class. Similarly, anyjava.lang.RuntimePermissionobjects are stored in the PermissionCollection returned by a call to thenewPermissionCollectionmethod in the RuntimePermission class. Thus, this class represents a collection of PermissionCollections.When the
addmethod 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 thenewPermissionCollectionmethod is called on that class to create the PermissionCollection and add it to the Permissions object. IfnewPermissionCollectionreturns 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
elementsmethod are not fail-fast. Modifications to a collection should not be performed while enumerating over that collection.- See Also:
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Permission,PermissionCollection,AllPermission
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Constructor Summary
Constructors Constructor and Description Permissions()Creates a new Permissions object containing no PermissionCollections.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method and Description voidadd(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.booleanimplies(Permission permission)Checks to see if this object's PermissionCollection for permissions of the specified permission's class implies the permissions expressed in the permission object.-
Methods inherited from class java.security.PermissionCollection
isReadOnly, setReadOnly, toString
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Constructor Detail
Permissions
public Permissions()
Creates a new Permissions object containing no PermissionCollections.
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Method Detail
add
public void add(Permission permission)
Adds a permission object to the PermissionCollection for the class the permission belongs to. For example, if permission is a FilePermission, it is added to the FilePermissionCollection stored in this Permissions object. This method creates a new PermissionCollection object (and adds the permission to it) if an appropriate collection does not yet exist.- Specified by:
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addin classPermissionCollection - Parameters:
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permission- the Permission object to add. - Throws:
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SecurityException- if this Permissions object is marked as readonly. - See Also:
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PermissionCollection.isReadOnly()
implies
public boolean implies(Permission permission)
Checks to see if this object's PermissionCollection for permissions of the specified permission's class implies the permissions expressed in the permission object. Returns true if the combination of permissions in the appropriate PermissionCollection (e.g., a FilePermissionCollection for a FilePermission) together imply the specified 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
impliesmethod is called with a permission specifying both "read" and "write" access to files in the "/tmp/scratch/foo" directory,trueis returned.Additionally, if this PermissionCollection contains the AllPermission, this method will always return true.
- Specified by:
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impliesin classPermissionCollection - Parameters:
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permission- the Permission object to check. - Returns:
- true if "permission" is implied by the permissions in the PermissionCollection it belongs to, false if not.
elements
public Enumeration<Permission> elements()
Returns an enumeration of all the Permission objects in all the PermissionCollections in this Permissions object.- Specified by:
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elementsin classPermissionCollection - Returns:
- an enumeration of all the Permissions.
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For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
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