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There is a newer version: 230521-nf-execution

package graphql.execution2.result;

import graphql.Assert;
import graphql.Internal;

import java.util.ArrayList;
import java.util.List;

@Internal
public class ExecutionResultZipper {

    private final ExecutionResultNode curNode;
    // from curNode upwards
    private final List breadcrumbList;

    public ExecutionResultZipper(ExecutionResultNode curNode, List breadcrumbs) {
        Assert.assertNotNull(breadcrumbs, "breadcrumbs can't be null");
        Assert.assertNotNull(curNode, "curNode can't be null");
        this.curNode = curNode;
        this.breadcrumbList = new ArrayList<>(breadcrumbs);
    }

    public ExecutionResultNode getCurNode() {
        return curNode;
    }

    public List getBreadcrumbList() {
        return new ArrayList<>(breadcrumbList);
    }

    public ExecutionResultNode getRootNode() {
        if (breadcrumbList.size() == 0) {
            return curNode;
        }
        return breadcrumbList.get(breadcrumbList.size() - 1).node;
    }

    public ExecutionResultNode getParent() {
        return breadcrumbList.get(0).node;
    }

    public ExecutionResultZipper withNode(ExecutionResultNode newNode) {
        return new ExecutionResultZipper(newNode, breadcrumbList);
    }

    public ExecutionResultZipper moveUp() {
        Assert.assertTrue(breadcrumbList.size() > 0, "no parent");
        Breadcrumb breadCrumb = breadcrumbList.get(0);
        ExecutionResultNode parent = breadCrumb.node.withChild(curNode, breadCrumb.position);
        return new ExecutionResultZipper(parent, breadcrumbList.subList(1, breadcrumbList.size()));
    }

    public ExecutionResultNode toRootNode() {
        ExecutionResultNode curRoot = curNode;
        for (Breadcrumb breadcrumb : breadcrumbList) {
            curRoot = breadcrumb.node.withChild(curRoot, breadcrumb.position);
        }
        return curRoot;
    }


    @Override
    public String toString() {
        return "ExecutionResultZipper{" +
                "curNode=" + curNode +
                ", breadcrumbList=" + breadcrumbList +
                '}';
    }
}