package edu.stanford.nlp.trees;
/**
* This is a simple strategy-type interface for operations that are applied to
* {@code Tree}. It typically is called iteratively over
* trees in a {@code Treebank}. The convention is for {@code TreeVisitor} implementing
* classes not to affect {@code Tree} instances they operate on, but to accomplish things via
* side effects (like counting statistics over trees, etc.).
*
* @author Christopher Manning
* @author Roger Levy
*/
public interface TreeVisitor {
/**
* Does whatever one needs to do to a particular parse tree.
*
* @param t A tree. Classes implementing this interface can assume
* that the tree passed in is not {@code null}.
*/
void visitTree(Tree t);
}