RoleClosureIteratorImpl
public interface RoleClosureIterator
Modifier and Type | Method | Description |
---|---|---|
java.lang.String |
next() |
Returns the next (as yet unreturned) role in the transitive closure of
the grant or grant-1 relation.
|
java.lang.String next() throws StandardException
Example: Assume a set of created roles forming nodes: {a1, a2, a3, b, c, d, e, f, h, j} Assume a set of GRANT statements forming arcs: GRANT a1 TO b; GRANT b TO e; GRANT e TO h; GRANT a1 TO c; GRANT e TO f; GRANT a2 TO c; GRANT c TO f; GRANT f TO h; GRANT a3 TO d; GRANT d TO f; GRANT a1 to j; a1 a2 a3 / | \ | | / b +--------> c d j | \ / e---+ \ / \ \ \ / \ \---------+ \ / \ \_ f \ / \ / \ / \ / \ / \ / hAn iterator on the inverse relation starting at h for the above grant graph will return:
closure(h, grant-inv) = {h, e, b, a1, f, c, a2, d, a3}
An iterator on normal (not inverse) relation starting at a1 for the above grant graph will return:
closure(a1, grant) = {a1, b, j, e, h, f, c}
StandardException
Apache Derby V10.14 Internals - Copyright © 2004,2018 The Apache Software Foundation. All Rights Reserved.