public class

ProtectionDomain

extends Object
java.lang.Object
   ↳ java.security.ProtectionDomain

Class Overview

This ProtectionDomain class encapsulates the characteristics of a domain, which encloses a set of classes whose instances are granted a set of permissions when being executed on behalf of a given set of Principals.

A static set of permissions can be bound to a ProtectionDomain when it is constructed; such permissions are granted to the domain regardless of the Policy in force. However, to support dynamic security policies, a ProtectionDomain can also be constructed such that it is dynamically mapped to a set of permissions by the current Policy whenever a permission is checked.

Summary

Public Constructors
ProtectionDomain(CodeSource codesource, PermissionCollection permissions)
Creates a new ProtectionDomain with the given CodeSource and Permissions.
ProtectionDomain(CodeSource codesource, PermissionCollection permissions, ClassLoader classloader, Principal[] principals)
Creates a new ProtectionDomain qualified by the given CodeSource, Permissions, ClassLoader and array of Principals.
Public Methods
final ClassLoader getClassLoader()
Returns the ClassLoader of this domain.
final CodeSource getCodeSource()
Returns the CodeSource of this domain.
final PermissionCollection getPermissions()
Returns the static permissions granted to this domain.
final Principal[] getPrincipals()
Returns an array of principals for this domain.
boolean implies(Permission permission)
Check and see if this ProtectionDomain implies the permissions expressed in the Permission object.
String toString()
Convert a ProtectionDomain to a String.
[Expand]
Inherited Methods
From class java.lang.Object

Public Constructors

public ProtectionDomain (CodeSource codesource, PermissionCollection permissions)

Creates a new ProtectionDomain with the given CodeSource and Permissions. If the permissions object is not null, then setReadOnly()) will be called on the passed in Permissions object. The only permissions granted to this domain are the ones specified; the current Policy will not be consulted.

Parameters
codesource the codesource associated with this domain
permissions the permissions granted to this domain

public ProtectionDomain (CodeSource codesource, PermissionCollection permissions, ClassLoader classloader, Principal[] principals)

Creates a new ProtectionDomain qualified by the given CodeSource, Permissions, ClassLoader and array of Principals. If the permissions object is not null, then setReadOnly() will be called on the passed in Permissions object. The permissions granted to this domain are dynamic; they include both the static permissions passed to this constructor, and any permissions granted to this domain by the current Policy at the time a permission is checked.

This constructor is typically used by ClassLoaders and DomainCombiners which delegate to Policy to actively associate the permissions granted to this domain. This constructor affords the Policy provider the opportunity to augment the supplied PermissionCollection to reflect policy changes.

Parameters
codesource the CodeSource associated with this domain
permissions the permissions granted to this domain
classloader the ClassLoader associated with this domain
principals the array of Principals associated with this domain. The contents of the array are copied to protect against subsequent modification.
See Also

Public Methods

public final ClassLoader getClassLoader ()

Returns the ClassLoader of this domain.

Returns
  • the ClassLoader of this domain which may be null.

public final CodeSource getCodeSource ()

Returns the CodeSource of this domain.

Returns
  • the CodeSource of this domain which may be null.

public final PermissionCollection getPermissions ()

Returns the static permissions granted to this domain.

Returns
  • the static set of permissions for this domain which may be null.
See Also

public final Principal[] getPrincipals ()

Returns an array of principals for this domain.

Returns
  • a non-null array of principals for this domain. Returns a new array each time this method is called.

public boolean implies (Permission permission)

Check and see if this ProtectionDomain implies the permissions expressed in the Permission object.

The set of permissions evaluated is a function of whether the ProtectionDomain was constructed with a static set of permissions or it was bound to a dynamically mapped set of permissions.

If the ProtectionDomain was constructed to a statically bound PermissionCollection then the permission will only be checked against the PermissionCollection supplied at construction.

However, if the ProtectionDomain was constructed with the constructor variant which supports dynamically binding permissions, then the permission will be checked against the combination of the PermissionCollection supplied at construction and the current Policy binding.

Parameters
permission the Permission object to check.
Returns
  • true if "permission" is implicit to this ProtectionDomain.

public String toString ()

Convert a ProtectionDomain to a String.

Returns
  • a string representation of the object.