result = 31 * result + (a.getScope() != null ? a.getScope().hashCode() : 0);
        result = 31 * result
                + (a.getDependencyFilter() != null ? a.getDependencyFilter().hashCode() : 0);
        result = 31 * result + (a.isOptional() ? 1 : 0);
        return result;
    }

    private static boolean artifactEquals(Artifact a1, Artifact a2) {

                                    if (null != managedExclusionFilter) {
                                        if (null != artifact.getDependencyFilter()) {
                                            AndArtifactFilter aaf = new AndArtifactFilter();
                                            aaf.add(artifact.getDependencyFilter());

                            project.setVersion(relocation.getVersion());
                        }

                        if (artifact.getDependencyFilter() != null
                                && !artifact.getDependencyFilter().include(artifact)) {
                            return null;
                        }

        return downloadUrl;
    }

    @Override
    public void setDownloadUrl(String downloadUrl) {
        this.downloadUrl = downloadUrl;
    }

    @Override
    public ArtifactFilter getDependencyFilter() {
        return dependencyFilter;
    }

    @Override
    public void setDependencyFilter(ArtifactFilter artifactFilter) {
        dependencyFilter = artifactFilter;
    }

    @Override

                return new ResolutionGroup(
                        artifact,
                        createArtifacts(
                                artifactFactory, a.dependencies, artifact.getScope(), artifact.getDependencyFilter()),
                        Collections.emptyList());
            } catch (InvalidVersionSpecificationException e) {