net.jini.core.constraint

Class ClientMinPrincipal

java.lang.Object

net.jini.core.constraint.ClientMinPrincipal

All Implemented Interfaces:

Serializable, InvocationConstraint

public final class ClientMinPrincipal
extends Object
implements InvocationConstraint, Serializable

Represents a constraint on the client, such that if the client authenticates itself, then it must authenticate itself as at least all of the specified principals. The mechanisms and credentials used to authenticate the client as those principals are not specified by this constraint. This constraint is intended for use by clients to control how much of their identity is exposed in remote calls; it is not intended for use by servers as an authorization mechanism. For example, if the client's subject contains sufficient information to authenticate as two distinct principals, the client might wish to ensure that it authenticates as one, the other, or both, depending on what the client believes is necessary for authorization at the server.

The use of an instance of this class does not directly imply a ClientAuthentication.YES constraint; that must be specified separately to ensure that the client actually authenticates itself. Because this constraint is conditional on client authentication, it does not conflict with ClientAuthentication.NO.

Since:

2.0

Author:

Sun Microsystems, Inc.

See Also:

ClientAuthentication, ClientMaxPrincipal, ClientMaxPrincipalType, ClientMinPrincipalType, AuthenticationPermission, Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
private Principal[]	principals The principals.
private static ObjectStreamField[]	serialPersistentFields
private static long	serialVersionUID

Constructor Summary

Constructors

Constructor and Description
ClientMinPrincipal(Collection c) Creates a constraint containing the specified principals, with duplicates removed.
ClientMinPrincipal(Principal p) Creates a constraint containing the specified principal.
ClientMinPrincipal(Principal[] principals) Creates a constraint containing the specified principals, with duplicates removed.

Method Summary

Modifier and Type	Method and Description
Set	elements() Returns an immutable set of all of the principals.
boolean	equals(Object obj) Two instances of this class are equal if they have the same principals (ignoring order).
(package private) Principal[]	getPrincipals() Returns the principals, without copying.
int	hashCode() Returns a hash code value for this object.
private void	readObject(ObjectInputStream s) Verifies that there is at least one principal, that none of the principals is null, and that there are no duplicates.
String	toString() Returns a string representation of this object.

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

serialVersionUID

private static final long serialVersionUID

See Also:

Constant Field Values

serialPersistentFields

private static final ObjectStreamField[] serialPersistentFields

principals

private final Principal[] principals

The principals.

Constructor Detail

ClientMinPrincipal

public ClientMinPrincipal(Principal p)

Creates a constraint containing the specified principal. This constructor is equivalent to calling a constructor with a single-element array containing the specified principal.

Parameters:

p - the principal

Throws:

NullPointerException - if the argument is null

ClientMinPrincipal

public ClientMinPrincipal(Principal[] principals)

Creates a constraint containing the specified principals, with duplicates removed. The argument passed to the constructor is neither modified nor retained; subsequent changes to that argument have no effect on the instance created.

Parameters:

principals - the principals

Throws:

NullPointerException - if the argument is null or any element is null

IllegalArgumentException - if the argument is empty

ClientMinPrincipal

public ClientMinPrincipal(Collection c)

Creates a constraint containing the specified principals, with duplicates removed. The argument passed to the constructor is neither modified nor retained; subsequent changes to that argument have no effect on the instance created.

Parameters:

c - the principals

Throws:

NullPointerException - if the argument is null or any element is null

IllegalArgumentException - if the argument is empty or the elements do not all implement the Principal interface

Method Detail

elements

public Set elements()

Returns an immutable set of all of the principals. Any attempt to modify the set results in an UnsupportedOperationException being thrown.

Returns:

an immutable set of all of the principals

getPrincipals

Principal[] getPrincipals()

Returns the principals, without copying.

hashCode

public int hashCode()

Returns a hash code value for this object.

Overrides:

hashCode in class Object

equals

public boolean equals(Object obj)

Two instances of this class are equal if they have the same principals (ignoring order).

Overrides:

equals in class Object

toString

public String toString()

Returns a string representation of this object.

Overrides:

toString in class Object

readObject

private void readObject(ObjectInputStream s)
                 throws IOException,
                        ClassNotFoundException

Verifies that there is at least one principal, that none of the principals is null, and that there are no duplicates.

Throws:

InvalidObjectException - if there are no principals, or any principal is null, or if there are duplicate principals

IOException

ClassNotFoundException