graphql.util

Interface TraverserVisitor<T>

All Known Implementing Classes:

TraverserVisitorStub

public interface TraverserVisitor<T>

Method Summary

Modifier and Type	Method and Description
default TraversalControl	backRef(TraverserContext<T> context) This method is called when a node was already visited before.
TraversalControl	enter(TraverserContext<T> context)
TraversalControl	leave(TraverserContext<T> context)

Method Detail

enter

TraversalControl enter(TraverserContext<T> context)

Parameters:

context - the context in place

Returns:

Any allowed control value

leave

TraversalControl leave(TraverserContext<T> context)

Parameters:

context - the context in place

Returns:

Only Continue or Quit allowed

backRef

default TraversalControl backRef(TraverserContext<T> context)

This method is called when a node was already visited before. This can happen for two reasons: 1. There is a cycle. 2. A node has more than one parent. This means the structure is not a tree but a graph.

Parameters:

context - the context in place

Returns:

Only Continue or Quit allowed