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org.apache.jorphan.collections
Interface HashTreeTraverser

All Known Implementing Classes:
CheckDirty, ConvertListeners, FindTestElementsUpToRootTraverser, PreCompiler, SearchByClass, TestCompiler, TreeCloner, TreeClonerNoTimer, TurnElementsOn

public interface HashTreeTraverser

By implementing this interface, a class can easily traverse a HashTree object, and be notified via callbacks of certain events. There are three such events:

  1. When a node is first encountered, the traverser's addNode(Object,HashTree) method is called. It is handed the object at that node, and the entire sub-tree of the node.
  2. When a leaf node is encountered, the traverser is notified that a full path has been finished via the processPath() method. It is the traversing class's responsibility to know the path that has just finished (this can be done by keeping a simple stack of all added nodes).
  3. When a node is retraced, the traverser's subtractNode() is called. Again, it is the traverser's responsibility to know which node has been retraced.
To summarize, as the traversal goes down a tree path, nodes are added. When the end of the path is reached, the processPath() call is sent. As the traversal backs up, nodes are subtracted.

The traversal is a depth-first traversal.

Version:
$Revision: 1595401 $
See Also:
HashTree, SearchByClass

Method Summary
 void addNode(Object node, HashTree subTree)
          The tree traverses itself depth-first, calling addNode for each object it encounters as it goes.
 void processPath()
          Process path is called when a leaf is reached.
 void subtractNode()
          Indicates traversal has moved up a step, and the visitor should remove the top node from its stack structure.
 

Method Detail

addNode

void addNode(Object node,
             HashTree subTree)
The tree traverses itself depth-first, calling addNode for each object it encounters as it goes. This is a callback method, and should not be called except by a HashTree during traversal.

Parameters:
node - the node currently encountered
subTree - the HashTree under the node encountered

subtractNode

void subtractNode()
Indicates traversal has moved up a step, and the visitor should remove the top node from its stack structure. This is a callback method, and should not be called except by a HashTree during traversal.


processPath

void processPath()
Process path is called when a leaf is reached. If a visitor wishes to generate Lists of path elements to each leaf, it should keep a Stack data structure of nodes passed to it with addNode, and removing top items for every subtractNode() call. This is a callback method, and should not be called except by a HashTree during traversal.


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