org.apache.cayenne.exp
Interface TraversalHandler

All Known Implementing Classes:
DB2QualifierTranslator, DerbyQualifierTranslator, OpenBaseQualifierTranslator, OracleQualifierTranslator, PostgresQualifierTranslator, QualifierTranslator, TraversalHelper, TrimmingQualifierTranslator

public interface TraversalHandler

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


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(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(Object leaf,
                Expression parentNode)
Called during the traversal when a leaf non-expression node is encountered.



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