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Cayenne Object Persistence Framework
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package org.apache.cayenne.exp;
/**
* Expression visitor interface. Defines callback methods invoked when
* walking the expression using {@link Expression#traverse(TraversalHandler)}.
*
* @author Andrei Adamchik
*/
public interface TraversalHandler {
/**
* Called during traversal after a child of expression
* has been visited.
*/
public void finishedChild(
Expression node,
int childIndex,
boolean hasMoreChildren);
/**
* Called during the traversal before an expression node children
* processing is started.
*
* @since 1.1
*/
public void startNode(Expression node, Expression parentNode);
/**
* Called during the traversal after an expression node children
* processing is finished.
*
* @since 1.1
*/
public void endNode(Expression node, Expression parentNode);
/**
* Called during the traversal when a leaf non-expression node
* is encountered.
*/
public void objectNode(Object leaf, Expression parentNode);
}
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