* Shortcut for {@code getService(DependencyCollector.class).collect(...)}
     *
     * @param artifact artifact for which to get the dependencies, including transitive ones
     * @return root node of the dependency graph for the given artifact
     *
     * @see org.apache.maven.api.services.DependencyCollector#collect(Session, Artifact)
     * @throws org.apache.maven.api.services.DependencyCollectorException if the dependency collection failed

import org.apache.maven.api.plugin.descriptor.lifecycle.Lifecycle;
import org.apache.maven.api.xml.XmlNode;
import org.codehaus.plexus.util.xml.Xpp3Dom;
import org.eclipse.aether.graph.DependencyNode;

public class DefaultMojoExecution implements MojoExecution {
    private final InternalMavenSession session;
    private final org.apache.maven.plugin.MojoExecution delegate;

      subsequently incorporated within the Work.

   2. Grant of Copyright License. Subject to the terms and conditions of
      this License, each Contributor hereby grants to You a perpetual,
      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
      copyright license to reproduce, prepare Derivative Works of,
      publicly display, publicly perform, sublicense, and distribute the

         *   v1<
         *      v3-v4
         *
         */
        graph = new MetadataGraph(4, 3);
        v1 = graph.addVertex(new ArtifactMetadata("g", "a1", "1.0"));
        graph.setEntry(v1);
        v2 = graph.addVertex(new ArtifactMetadata("g", "a2", "1.0"));
        v3 = graph.addVertex(new ArtifactMetadata("g", "a3", "1.0"));
        v4 = graph.addVertex(new ArtifactMetadata("g", "a4", "1.0"));

        // v1-->v2

import org.codehaus.plexus.configuration.PlexusConfigurationException;
import org.codehaus.plexus.personality.plexus.lifecycle.phase.Contextualizable;
import org.eclipse.aether.RepositorySystemSession;
import org.eclipse.aether.graph.DependencyFilter;
import org.eclipse.aether.repository.RemoteRepository;
import org.eclipse.aether.resolution.ArtifactResult;
import org.eclipse.aether.resolution.DependencyResult;

    private Map<MavenProject, ?> whiteList;

    private List<MavenProject> sortedProjects;

    /**
     * Creates a new project dependency graph from the specified graph.
     *
     * @param projectDependencyGraph The project dependency graph to create a sub view from, must not be {@code null}.
     * @param whiteList The projects on which the dependency view should focus, must not be {@code null}.
     */

    /**
     * Helper class to traverse graph. Required to make the containing method thread-safe
     * and yet use class level data to lessen stack usage in recursion
     */
    private class ClasspathGraphVisitor {
        MetadataGraph graph;

        ClasspathContainer cpc;

        List<MetadataGraphVertex> visited;

    /**
     * Gets the exceptions that occurred while building the dependency graph.
     *
     * @return the exceptions that occurred, never {@code null}
     */
    @Nonnull
    List<Exception> getExceptions();

    /**
     * Gets the root node of the dependency graph.
     *
     * @return the root node of the dependency graph or {@code null} if none
     */
    @Nullable
    Node getRoot();

 */
package org.apache.maven.repository;

import java.util.ArrayList;
import java.util.Collection;

/**
 * This is the main graph data structure used by the RepositorySystem to present tree and graph objects.
 *
 *
 */
@Deprecated
public class MetadataGraph {
    /** all graph nodes */
    Collection<MetadataGraphNode> nodes;

    /** entry point for tree-like structures */
    MetadataGraphNode entry;

import org.apache.maven.api.Node;
import org.apache.maven.api.NodeVisitor;
import org.eclipse.aether.artifact.Artifact;
import org.eclipse.aether.graph.Dependency;
import org.eclipse.aether.graph.DependencyNode;

public abstract class AbstractNode implements Node {

    abstract org.eclipse.aether.graph.DependencyNode getDependencyNode();

    @Override
    public boolean accept(NodeVisitor visitor) {
        if (visitor.enter(this)) {