position.java

Java数据结构开发包

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package jdsl.core.api;

/**
 * An abstraction of the notion of a "place" in a
 * container -- where an element is stored relative to other elements in
 * the container.  (A node of a tree and a vertex of a graph are examples of
 * positions.)  Conceptually, what Position adds to Accessor's ability to
 * get an element is the ability to get such topological information; but
 * the nature of the topological information varies with the container,
 * so there are no new methods here.
 *
 * <p>When a
 * position is no longer used by the container it is marked as
 * <i>invalid</i> and any subsequent use of that position provokes an
 * <code>InvalidAccessorException</code>.  An InvalidAccessorException
 * is also thrown when a Position belongs to a different container
 * (either a container of a different type, or another container of this
 * same type).
 * <p> Two possible implementations of a position: as a
 * wrapper around an index into an array, or as a reference to a node.
 *
 * @version JDSL 2.1.1 
 * @author Mark Handy (mdh)
 * @author Benoit Hudson (bh)
 * @author Andrew Schwerin (schwerin)
 * @author Michael T. Goodrich
 * @author Roberto Tamassia
 * @see PositionalContainer */

public interface Position extends Accessor, Decorable {

}