Module java.base

Package java.security

Class ProtectionDomain

java.lang.Object

java.security.ProtectionDomain

public class ProtectionDomain
extends Object

The 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.

Since:

1.2

Constructor Summary

Constructors

Constructor	Description
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.

Method Summary

Modifier and Type	Method	Description
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 perm)	Check and see if this ProtectionDomain implies the permissions expressed in the Permission object.
final boolean	staticPermissionsOnly()	Returns true if this domain contains only static permissions and does not check the current Policy at the time of permission checking.
String	toString()	Convert a ProtectionDomain to a String.

Methods declared in class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Details

ProtectionDomain

public ProtectionDomain(CodeSource codesource,
 PermissionCollection permissions)

Creates a new ProtectionDomain with the given CodeSource and permissions. If permissions is not null, then setReadOnly() will be called on the passed in permissions.

The permissions granted to this domain are static, i.e. invoking the staticPermissionsOnly() method returns true. They contain only the ones passed to this constructor and the current policy will not be consulted.

Parameters:

codesource - the codesource associated with this domain

permissions - the permissions granted to this domain

ProtectionDomain

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 permissions is not null, then setReadOnly() will be called on the passed in permissions.

The permissions granted to this domain are dynamic, i.e. invoking the staticPermissionsOnly() method returns false. 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 the Policy object 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 Principal objects associated with this domain. The contents of the array are copied to protect against subsequent modification.

Since:

1.4

See Also:

• Policy.refresh()
• Policy.getPermissions(ProtectionDomain)

Method Details

getCodeSource

public final CodeSource getCodeSource()

Returns the CodeSource of this domain.

Returns:

the CodeSource of this domain which may be null.

Since:

1.2

getClassLoader

public final ClassLoader getClassLoader()

Returns the ClassLoader of this domain.

Returns:

the ClassLoader of this domain which may be null.

Since:

1.4

getPrincipals

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.

Since:

1.4

getPermissions

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:

• Policy.refresh()
• Policy.getPermissions(ProtectionDomain)

staticPermissionsOnly

public final boolean staticPermissionsOnly()

Returns true if this domain contains only static permissions and does not check the current Policy at the time of permission checking.

Returns:

true if this domain contains only static permissions.

Since:

9

implies

public boolean implies(Permission perm)

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 staticPermissionsOnly() method returns true, then the permission will only be checked against the PermissionCollection supplied at construction.

Otherwise, the permission will be checked against the combination of the PermissionCollection supplied at construction and the current policy binding.

Parameters:

perm - the {code Permission} object to check.

Returns:

true if perm is implied by this ProtectionDomain.

toString

public String toString()

Convert a ProtectionDomain to a String.

Overrides:

toString in class Object

Returns:

a string representation of the object