org.apache.cayenne.exp
Interface TraversalHandler

All Known Implementing Classes:

DB2QualifierTranslator, OpenBaseQualifierTranslator, PostgresQualifierTranslator, QualifierTranslator, TraversalHelper, TrimmingQualifierTranslator

public interface TraversalHandler

Expression visitor interface. Defines callback methods invoked when walking the expression using Expression.traverse(TraversalHandler).

Author:

Andrei Adamchik

Method Summary

void	endNode(Expression node, Expression parentNode) Called during the traversal after an expression node children processing is finished.
void	finishedChild(Expression node, int childIndex, boolean hasMoreChildren) Called during traversal after a child of expression has been visited.
void	objectNode(java.lang.Object leaf, Expression parentNode) Called during the traversal when a leaf non-expression node is encountered.
void	startNode(Expression node, Expression parentNode) Called during the traversal before an expression node children processing is started.

Method Detail

finishedChild

void finishedChild(Expression node,
                   int childIndex,
                   boolean hasMoreChildren)

Called during traversal after a child of expression has been visited.

startNode

void startNode(Expression node,
               Expression parentNode)

Called during the traversal before an expression node children processing is started.

Since:

1.1

endNode

void endNode(Expression node,
             Expression parentNode)

Called during the traversal after an expression node children processing is finished.

Since:

1.1

objectNode

void objectNode(java.lang.Object leaf,
                Expression parentNode)

Called during the traversal when a leaf non-expression node is encountered.