public static boolean equalsId(Artifact artifact1, Artifact artifact2) {
        if (artifact1 == null || artifact2 == null) {
            return false;
        }
        if (!Objects.equals(artifact1.getArtifactId(), artifact2.getArtifactId())) {
            return false;
        }
        if (!Objects.equals(artifact1.getGroupId(), artifact2.getGroupId())) {
            return false;
        }
        if (!Objects.equals(artifact1.getExtension(), artifact2.getExtension())) {
            return false;
        }
        if (!Objects.equals(artifact1.getClassifier(), artifact2.getClassifier())) {
            return false;
        }
        return Objects.equals(artifact1.getVersion(), artifact2.getVersion());

private DefaultDependencyManager(
            int depth,
            int deriveUntil,
            int applyFrom,
            Map<Object, String> managedVersions,
            Map<Object, String> managedScopes,
            Map<Object, Boolean> managedOptionals,
            Map<Object, String> managedLocalPaths,
            Map<Object, Collection<Exclusion>> managedExclusions) {
        super(
                depth,
                deriveUntil,
                applyFrom,
                managedVersions,
                managedScopes,
                managedOptionals,
                managedLocalPaths,
                managedExclusions);
    }

    @Override
    protected DependencyManager newInstance(
            Map<Object, String> managedVersions,
            Map<Object, String> managedScopes,
            Map<Object, Boolean> managedOptionals,
            Map<Object, String> managedLocalPaths,
            Map<Object, Collection<Exclusion>> managedExclusions) {
        return new DefaultDependencyManager(

}

        @Override
        public boolean equals(Object obj) {
            if (obj == this) {
                return true;
            } else if (!(obj instanceof Key)) {
                return false;
            }
            Key that = (Key) obj;
            return artifact.getArtifactId().equals(that.artifact.getArtifactId())
                    && artifact.getGroupId().equals(that.artifact.getGroupId())
                    && artifact.getExtension().equals(that.artifact.getExtension())
                    && artifact.getClassifier().equals(that.artifact.getClassifier());
        }

        @Override
        public int hashCode() {