try (InputStream is = urls.nextElement().openStream()) {
                    ExtensionDescriptor descriptor = BUILDER.build(is);
                    artifacts.addAll(descriptor.getExportedArtifacts());
                    packages.addAll(descriptor.getExportedPackages());
                }
            }
        } catch (IOException ignored) {
            // exports descriptors are entirely optional
        }

                if (artifactRequest != null && artifactRequest.getRepositories() != null) {
                    repositories.addAll(artifactRequest.getRepositories());
                } else if (artifactDescriptorRequest != null && artifactDescriptorRequest.getRepositories() != null) {
                    repositories.addAll(artifactDescriptorRequest.getRepositories());
                }
                if (!repositories.isEmpty()) {

            }

            Collection<String> versions =
                    new LinkedHashSet<>(recessive.getVersioning().getVersions());
            versions.addAll(original.getVersions());
            versioning.versions(new ArrayList<>(versions));
        }

        metadata = metadata.withVersioning(versioning.build());

        // just carry-on as-is

        for (MojoExecution mojoExecution : mojoExecutions) {
            MojoDescriptor mojoDescriptor = mojoExecution.getMojoDescriptor();

            scopesToResolve.addAll(toScopes(mojoDescriptor.getDependencyResolutionRequired()));

            scopesToCollect.addAll(toScopes(mojoDescriptor.getDependencyCollectionRequired()));
        }
    }

    private Collection<String> toScopes(String classpath) {

        TaskSegment mergedSegment = new TaskSegment(false);

        for (TaskSegment taskSegment : taskSegments) {
            mergedSegment.getTasks().addAll(taskSegment.getTasks());
        }

        return lifecycleExecutionPlanCalculator.calculateExecutionPlan(
                session, session.getCurrentProject(), mergedSegment.getTasks(), setup);
    }

                final Lifecycle lifecycle = defaultLifecycles.get(phase);
                if (lifecycle != null) {
                    totalPhaseSet.addAll(lifecycle.getPhases());
                }
            }
        }
        this.phasesInExecutionPlan = new ArrayList<>(totalPhaseSet);

        Map<String, ExecutionPlanItem> lastInExistingPhases = new HashMap<>();

        List<T> copy = null;

        if (original != null) {
            copy = new ArrayList<>();

            if (!original.isEmpty()) {
                copy.addAll(original);
            }
        }

        return copy;
    }

            } else {
                pomHash = 0;
            }
            this.resolveManagedVersions = resolveManagedVersions;
            this.repositories.add(localRepository);
            this.repositories.addAll(remoteRepositories);

            int hash = 17;
            hash = hash * 31 + artifactHashCode(artifact);
            hash = hash * 31 + (resolveManagedVersions ? 1 : 2);

            for (ArtifactRepository aliasedRepo : aliasedRepos) {
                releasePolicies.add(aliasedRepo.getReleases());
                mirroredRepos.addAll(aliasedRepo.getMirroredRepositories());
            }

            ArtifactRepositoryPolicy releasePolicy = getEffectivePolicy(releasePolicies);

        }

        if (project.getManagedVersionMap() != null) {
            setManagedVersionMap(project.getManagedVersionMap());
        }

        lifecyclePhases.addAll(project.lifecyclePhases);
    }

    private static String getProjectReferenceId(String groupId, String artifactId, String version) {
        StringBuilder buffer = new StringBuilder(128);