com.rabbitmq.jms.parse

Interface Visitor<Node>

All Known Implementing Classes:

SqlTypeSetterVisitor

public interface Visitor<Node>

A visitor is guided by a ParseTreeTraverser to each Node of a tree.

It is intended that visitBefore(Object, Object[]) and visitAfter(Object, Object[]) are called for each node in the tree. The order of traversal is both pre- and post-order: visitBefore(Object, Object[]) is called on a parent before the children are called, and visitAfter(Object, Object[]) is called after the children are called.

The returned boolean is interpreted by the caller and its meaning is not part of the Visitor contract.

Method Summary

Modifier and Type	Method and Description
boolean	visitAfter(Node parent, Node[] children) Visit a place in the tree: the Node for this place in the tree, and an array of Nodes of the immediate children, are passed as parameters.
boolean	visitBefore(Node parent, Node[] children) Visit a place in the tree: the Node for this place in the tree, and an array of Nodes of the immediate children, are passed as parameters.

Method Detail

visitBefore

boolean visitBefore(Node parent,
                    Node[] children)

Visit a place in the tree: the Node for this place in the tree, and an array of Nodes of the immediate children, are passed as parameters.

Parameters:

parent - - the node (value) of the parent at this point in the tree; can be updated.

children - - array of the nodes of the children of this parent (can be zero-length array; must not be null).

Returns:

true or false - interpreted by the caller (typically a tree traversal algorithm).

visitAfter

boolean visitAfter(Node parent,
                   Node[] children)

Visit a place in the tree: the Node for this place in the tree, and an array of Nodes of the immediate children, are passed as parameters.

Parameters:

parent - - the node (value) of the parent at this point in the tree; can be updated.

children - - array of the nodes of the children of this parent (can be zero-length array; must not be null).

Returns:

true or false - interpreted by the caller (typically a tree traversal algorithm).