}

    // CHECKSTYLE_OFF: LineLength
    /**
     * Uses the {@link EnforcerRuleHelper} to populate the values of the
     * {@link DependencyTreeBuilder#buildDependencyTree(MavenProject, ArtifactRepository, ArtifactFactory, ArtifactMetadataSource, ArtifactFilter, ArtifactCollector)}
     * factory method. <br/>
     * This method simply exists to hide all the ugly lookup that the {@link EnforcerRuleHelper} has to do.
     * 
     * @param helper
     * @return a Dependency Node which is the root of the project's dependency tree
     * @throws EnforcerRuleException
     */
    // CHECKSTYLE_ON: LineLength
    private DependencyNode getNode( EnforcerRuleHelper helper )
        throws EnforcerRuleException
    {
        try
        {
            MavenProject project = (MavenProject) helper.evaluate( "${project}" );
            MavenSession session = (MavenSession) helper.evaluate( "${session}" );
            DependencyCollectorBuilder dependencyCollectorBuilder =
                helper.getComponent( DependencyCollectorBuilder.class );
            ArtifactRepository repository = (ArtifactRepository) helper.evaluate( "${localRepository}" );

            ProjectBuildingRequest buildingRequest =
                new DefaultProjectBuildingRequest( session.getProjectBuildingRequest() );
            buildingRequest.setProject( project );
            buildingRequest.setLocalRepository( repository );
            ArtifactFilter filter = null; // we need to evaluate all scopes

            return dependencyCollectorBuilder.collectDependencyGraph( buildingRequest, filter );
        }
        catch ( ExpressionEvaluationException | ComponentLookupException e )