Interface TraversalHandler

All Known Implementing Classes:
TraversalHelper

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

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

    • finishedChild

      default void finishedChild(Expression node, int childIndex, boolean hasMoreChildren)
      Called during traversal after a child of expression has been visited.
    • startNode

      default void startNode(Expression node, Expression parentNode)
      Called during the traversal before an expression node children processing is started.
      Since:
      1.1
    • endNode

      default void endNode(Expression node, Expression parentNode)
      Called during the traversal after an expression node children processing is finished.
      Since:
      1.1
    • objectNode

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