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## org.apache.cayenne.exp
Class TraversalHelper

    java.lang.Object
      org.apache.cayenne.exp.TraversalHelper

All Implemented Interfaces:
  TraversalHandler

    public class TraversalHelper

extends Object
implements TraversalHandler

Noop implementation of TraversalHandler. Useful as a superclass for partial implementations of TraversalHandler.

Author:
  Andrus Adamchik

Constructor Summary
`TraversalHelper()`

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.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### TraversalHelper

    public TraversalHelper()

Method Detail

### startNode

    public void startNode(Expression node,
                          Expression parentNode)

  Description copied from interface: `TraversalHandler`
  Called during the traversal before an expression node children processing is started.

  Specified by:
    `startNode` in interface `TraversalHandler`

### endNode

    public void endNode(Expression node,
                        Expression parentNode)

  Description copied from interface: `TraversalHandler`
  Called during the traversal after an expression node children processing is finished.

  Specified by:
    `endNode` in interface `TraversalHandler`

### finishedChild

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

  Description copied from interface: `TraversalHandler`
  Called during traversal after a child of expression has been visited.

  Specified by:
    `finishedChild` in interface `TraversalHandler`

### objectNode

    public void objectNode(Object leaf,
                           Expression parentNode)

  Description copied from interface: `TraversalHandler`
  Called during the traversal when a leaf non-expression node is encountered.

  Specified by:
    `objectNode` in interface `TraversalHandler`

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