String projectKey = ArtifactUtils.versionlessKey(groupId, artifactId);

        Map<String, Vertex> vertices = vertexMap.get(projectKey);

        if (vertices != null) {
            if (isSpecificVersion(version)) {
                Vertex vertex = vertices.get(version);
                if (vertex != null) {
                    addEdge(projectVertex, vertex, project, projectMap, force, safe);
                }