com.phoenixst.plexus.traversals
public class PreOrderTraverser extends Object implements PruningTraverser
Traverser
for a
Graph
, with no cycle detection. The first node
returned is the start node, and no Edge
is traversed
to reach it. All of the caveats concerning the ordering of the
operations hasNext()
, next()
, and
remove()
detailed by the Traverser class
documentation apply here.
Since: 1.0
Version: $Revision: 1.6 $
Constructor Summary | |
---|---|
PreOrderTraverser(Object startNode, Graph graph, Predicate traverserPredicate)
Creates a new PreOrderTraverser . | |
PreOrderTraverser(Object startNode, OrientedForest forest)
Creates a new PreOrderTraverser , which
depth-first traverses the descendants of the specified
startNode . | |
PreOrderTraverser(Object startNode, Transformer traverserFactory)
Creates a new PreOrderTraverser . | |
PreOrderTraverser(Object startNode, Graph graph, Transformer traverserFactory)
Creates a new PreOrderTraverser . |
Method Summary | |
---|---|
Graph.Edge | getEdge() |
boolean | hasNext() |
Object | next() |
void | prune() |
void | remove()
Removes from the underlying Graph the last node
returned by PreOrderTraverser. |
void | removeEdge() |
PreOrderTraverser
.PreOrderTraverser
, which
depth-first traverses the descendants of the specified
startNode
. The specified startNode
cannot be removed by PreOrderTraverser when using this
constructor.PreOrderTraverser
. The specified
startNode
cannot be removed by PreOrderTraverser
when using this constructor.PreOrderTraverser
. If the
graph
argument is null
, the
specified startNode
cannot be removed by PreOrderTraverser.Graph
the last node
returned by PreOrderTraverser. This will prevent the exploration
of those nodes that would have been reached through the
removed node (unless they are reachable by another route).
This method can be called only once per call to
next()
. The behavior of this
Traverser
is unspecified if the underlying graph
structure is modified while the traversal is in progress in
any way other than by calling this method or PreOrderTraverser.
Throws: IllegalStateException if next()
has not
yet been called, or remove()
or
removeEdge
has been called after the last call to
next()
.
Edge
that would be returned by getEdge()
. This will prevent the exploration of those nodes
that would have been reached through the removed
Edge
(unless they are reachable by another
route).
Description copied from interface: Traverser
{@inheritDoc }