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## 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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