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A Generic Iterator for Tree Traversal

By Alexander Ananiev , November 01, 2000

Generic tree traversal logic can be used with any type of tree-like structure or tree node, letting you focus on the application logic rather than the internals of the tree structure organization.
Nov00: Algorithm Alley 


if ( levelIter.hasChildren() ) {
  levelIter=levelIter.nextLevel(); 
} 
Object nextElt=null;
// if there are more siblings at the current level
if ( levelIter.hasMoreElements() )
  nextElt=levelIter.nextElement();
// the entire level has been processed--go to the parent level
else if (levelIter.hasParent() ) {
  levelIter=levelIter.toParent();
  nextElt=levelIter.nextElement();
} 
return nextElt;

Example 1: Using LevelIterator to implement the tree iterator's next method.



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