Hierarchy
is a set of members, organized into levels.
The casual user does not have to deal with this class directly.
The structure of the logger hierarchy is maintained by the {@link #getLogger} method. The hierarchy is such that children linkto their parent but parents do not have any pointers to their children. Moreover, loggers can be instantiated in any order, in particular descendant before ancestor.
In case a descendant is created before a particular ancestor, then it creates a provision node for the ancestor and adds itself to the provision node. Other descendants of the same ancestor add themselves to the previously created provision node. @author Ceki Gülcü @author Mark Womack
A Hierarchy is a collection of {@link Level}s, each of which is a category of similar {@link Member}s.
A Dimension must have at least one Hierarchy, and may have more than one, but most have exactly one Hierarchy.
@author jhyde @version $Id: Hierarchy.java 315 2010-05-29 00:56:11Z jhyde $ @since Aug 23, 2006
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