}

    private static List<String> visitAll(
            Collection<Vertex> children, Map<Vertex, DfsState> stateMap, List<String> list) {
        for (Vertex v : children) {
            DfsState state = stateMap.putIfAbsent(v, DfsState.VISITING);
            if (state == null) {
                visitAll(v.children, stateMap, list);
                stateMap.put(v, DfsState.VISITED);
                list.add(v.label);

        this.parent = parent;
        this.node = (XmlNode) parent.getNode();
        this.children = this.node.getChildren();
        if (startWith != null) {
            Xpp3Dom startWithNode = (Xpp3Dom) startWith.getNode();
            for (; filteredIndex < children.size(); filteredIndex++) {
                if (startWithNode.equals(children.get(filteredIndex))) {
                    filteredIndex++;
                    break;

import org.eclipse.aether.graph.DependencyNode;

class WrapperNode extends AbstractNode {
    protected final Node delegate;
    protected final List<Node> children;

    WrapperNode(Node delegate, List<Node> children) {
        this.delegate = delegate;
        this.children = children;
    }

    @Override
    DependencyNode getDependencyNode() {
        return Utils.cast(AbstractNode.class, delegate, "delegate").getDependencyNode();

import org.eclipse.aether.graph.DependencyNode;

class WrapperNode extends AbstractNode {
    protected final Node delegate;
    protected final List<Node> children;

    WrapperNode(Node delegate, List<Node> children) {
        this.delegate = delegate;
        this.children = children;
    }

    @Override
    DependencyNode getDependencyNode() {
        return Utils.cast(AbstractNode.class, delegate, "delegate").getDependencyNode();

 * @since 4.0.0
 */
@Experimental
@ThreadSafe
@Immutable
public interface XmlNode {

    String CHILDREN_COMBINATION_MODE_ATTRIBUTE = "combine.children";

    String CHILDREN_COMBINATION_MERGE = "merge";

    String CHILDREN_COMBINATION_APPEND = "append";

    /**
     * This default mode for combining children DOMs during merge means that where element names match, the process will

    }

    private static List<String> visitCycle(
            Map<String, Set<String>> graph,
            Collection<String> children,
            Map<String, DfsState> stateMap,
            LinkedList<String> cycle) {
        if (children != null) {
            for (String v : children) {
                DfsState state = stateMap.putIfAbsent(v, DfsState.VISITING);
                if (state == null) {

    MetadataTreeNode parent; // papa

    /** default # of children. Used for tree creation optimization only */
    int nChildren = 8;

    MetadataTreeNode[] children; // of cause

    public int getNChildren() {
        return nChildren;
    }

    public void setNChildren(int children) {
        nChildren = children;
    }

     * Starts the visit to the specified dependency node.
     *
     * @param node the dependency node to visit
     * @return <code>true</code> to visit the specified dependency node's children, <code>false</code> to skip the
     *         specified dependency node's children and proceed to its next sibling
     */
    boolean enter(@Nonnull Node node);

    /**
     * Ends the visit to the specified dependency node.
     *

        if (node.getValue() != null) {
            return node.getValue();
        } else {
            List<Object> children = new ArrayList<>();
            for (XmlNode child : node.getChildren()) {
                children.add(getValue(child));
            }
            return children;
        }
    }

    @Override
    public Object getBaseValue() {
        return node;
    }

    @Override

            List<XmlNode> children = new ArrayList<>();
            for (PlexusConfiguration c : config.getChildren()) {
                children.add(toXml(c, evaluator));
            }
            String name = config.getName();
            Object value = evaluator.evaluate(config.getValue());
            return new XmlNodeImpl(name, value != null ? value.toString() : null, null, children, null);
        }
    }