Set<Artifact> dependencies = new HashSet<>();

        if ("g".equals(artifact.getArtifactId())) {
            Artifact a = null;
            try {
                a = factory.createBuildArtifact("org.apache.maven", "h", "1.0", "jar");
                dependencies.add(a);
            } catch (Exception e) {
                throw new ArtifactMetadataRetrievalException("Error retrieving metadata", e, a);
            }

        Set<Artifact> dependencies = new HashSet<>();

        if ("g".equals(artifact.getArtifactId())) {
            Artifact a = null;
            try {
                a = factory.createBuildArtifact("org.apache.maven", "h", "1.0", "jar");
                dependencies.add(a);
            } catch (Exception e) {
                throw new ArtifactMetadataRetrievalException("Error retrieving metadata", e, a);
            }

            VersionRange versionRange,
            String type,
            String classifier,
            String scope,
            String inheritedScope,
            boolean optional);

    Artifact createBuildArtifact(String groupId, String artifactId, String version, String packaging);

    Artifact createProjectArtifact(String groupId, String artifactId, String version);

            String inheritedScope,
            boolean optional) {
        return createArtifact(groupId, artifactId, versionRange, type, classifier, scope, inheritedScope, optional);
    }

    public Artifact createBuildArtifact(String groupId, String artifactId, String version, String packaging) {
        return createArtifact(groupId, artifactId, version, null, packaging, null, null);
    }