Package graphql.language

Class NodeTraverser

java.lang.Object

graphql.language.NodeTraverser

@PublicApi
public class NodeTraverser
extends Object

Lets you traverse a Node tree.

Constructor Summary

Constructors

Constructor	Description
NodeTraverser()
NodeTraverser(Map<Class<?>,Object> rootVars, Function<? super Node,? extends List<Node>> getChildren)

Method Summary

Modifier and Type	Method	Description
Object	depthFirst(NodeVisitor nodeVisitor, Node root)	depthFirst traversal with a enter/leave phase.
Object	depthFirst(NodeVisitor nodeVisitor, Collection<? extends Node> roots)	depthFirst traversal with a enter/leave phase.
static <T> T	oneVisitWithResult(Node node, NodeVisitor nodeVisitor)
Object	postOrder(NodeVisitor nodeVisitor, Node root)	Version of postOrder(NodeVisitor, Collection) with one root.
Object	postOrder(NodeVisitor nodeVisitor, Collection<? extends Node> roots)	Post-Order traversal: This is a specialized version of depthFirst with only the leave phase.
Object	preOrder(NodeVisitor nodeVisitor, Node root)	Version of preOrder(NodeVisitor, Collection) with one root.
Object	preOrder(NodeVisitor nodeVisitor, Collection<? extends Node> roots)	Pre-Order traversal: This is a specialized version of depthFirst with only the enter phase.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

NodeTraverser

public NodeTraverser(Map<Class<?>,Object> rootVars,
 Function<? super Node,? extends List<Node>> getChildren)

NodeTraverser

public NodeTraverser()

Method Details

depthFirst

public Object depthFirst(NodeVisitor nodeVisitor,
 Node root)

depthFirst traversal with a enter/leave phase.

Parameters:

nodeVisitor - the visitor of the nodes

root - the root node

Returns:

the accumulation result of this traversal

depthFirst

public Object depthFirst(NodeVisitor nodeVisitor,
 Collection<? extends Node> roots)

depthFirst traversal with a enter/leave phase.

Parameters:

nodeVisitor - the visitor of the nodes

roots - the root nodes

Returns:

the accumulation result of this traversal

preOrder

public Object preOrder(NodeVisitor nodeVisitor,
 Node root)

Version of preOrder(NodeVisitor, Collection) with one root.

Parameters:

nodeVisitor - the visitor of the nodes

root - the root node

Returns:

the accumulation result of this traversal

preOrder

public Object preOrder(NodeVisitor nodeVisitor,
 Collection<? extends Node> roots)

Pre-Order traversal: This is a specialized version of depthFirst with only the enter phase.

Parameters:

nodeVisitor - the visitor of the nodes

roots - the root nodes

Returns:

the accumulation result of this traversal

postOrder

public Object postOrder(NodeVisitor nodeVisitor,
 Node root)

Version of postOrder(NodeVisitor, Collection) with one root.

Parameters:

nodeVisitor - the visitor of the nodes

root - the root node

Returns:

the accumulation result of this traversal

postOrder

public Object postOrder(NodeVisitor nodeVisitor,
 Collection<? extends Node> roots)

Post-Order traversal: This is a specialized version of depthFirst with only the leave phase.

Parameters:

nodeVisitor - the visitor of the nodes

roots - the root nodes

Returns:

the accumulation result of this traversal

oneVisitWithResult

public static <T> T oneVisitWithResult(Node node,
 NodeVisitor nodeVisitor)