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) {

    public void setDownloadUrl(String downloadUrl) {
        artifact.setDownloadUrl(downloadUrl);
    }

    /** {@inheritDoc} */
    @Override
    public ArtifactFilter getDependencyFilter() {
        return artifact.getDependencyFilter();
    }

    /** {@inheritDoc} */
    @Override
    public void setDependencyFilter(ArtifactFilter artifactFilter) {
        artifact.setDependencyFilter(artifactFilter);
    }

                                    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;
                        }

    void updateVersion(String version, ArtifactRepository localRepository);

    String getDownloadUrl();

    void setDownloadUrl(String downloadUrl);

    ArtifactFilter getDependencyFilter();

    void setDependencyFilter(ArtifactFilter artifactFilter);

    ArtifactHandler getArtifactHandler();

    List<String> getDependencyTrail();

        if (artifact.getVersion() != null) {
            clone.setBaseVersion(artifact.getBaseVersion());
        }
        clone.setDependencyFilter(artifact.getDependencyFilter());
        clone.setDependencyTrail(copyList(artifact.getDependencyTrail()));
        clone.setDownloadUrl(artifact.getDownloadUrl());
        clone.setRepository(artifact.getRepository());

        return clone;

        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) {