public static Source flattenBaseSpecs(Source source) {
    if (source.getBaseSpecs() == null) {
      return source;
    }
    Map<String, Object> params = new HashMap<>();
    for (Map<String, Object> baseSpec : source.getBaseSpecs()) {
      params.putAll(baseSpec);
    }
    params.putAll(source.getSpec());

    Source result = source.clone();
    result.setSpec(params);
    result.setBaseSpecs(null);
    return result;
  }
@Test
  public void testFlattenBaseSpecs() throws Exception {
    // G = grandparent, P = parent, C = child.
    CloudObject grandparent = CloudObject.forClassName("text");
    addString(grandparent, "G", "g_g");
    addString(grandparent, "GP", "gp_g");
    addString(grandparent, "GC", "gc_g");
    addString(grandparent, "GPC", "gpc_g");

    CloudObject parent = CloudObject.forClassName("text");
    addString(parent, "P", "p_p");
    addString(parent, "PC", "pc_p");
    addString(parent, "GP", "gp_p");
    addString(parent, "GPC", "gpc_p");

    CloudObject child = CloudObject.forClassName("text");
    addString(child, "C", "c_c");
    addString(child, "PC", "pc_c");
    addString(child, "GC", "gc_c");
    addString(child, "GPC", "gpc_c");

    Source source = new Source();
    source.setBaseSpecs(new ArrayList<Map<String, Object>>());
    source.getBaseSpecs().add(grandparent);
    source.getBaseSpecs().add(parent);
    source.setSpec(child);
    source.setCodec(CloudObjects.asCloudObject(StringUtf8Coder.of(), /*sdkComponents=*/ null));

    Source flat = CloudSourceUtils.flattenBaseSpecs(source);
    assertNull(flat.getBaseSpecs());
    assertEquals(
        StringUtf8Coder.class.getName(),
        getString(flat.getCodec(), PropertyNames.OBJECT_TYPE_NAME));

    CloudObject flatSpec = CloudObject.fromSpec(flat.getSpec());
    assertEquals("g_g", getString(flatSpec, "G"));
    assertEquals("p_p", getString(flatSpec, "P"));
    assertEquals("c_c", getString(flatSpec, "C"));
    assertEquals("gp_p", getString(flatSpec, "GP"));
    assertEquals("gc_c", getString(flatSpec, "GC"));
    assertEquals("pc_c", getString(flatSpec, "PC"));
    assertEquals("gpc_c", getString(flatSpec, "GPC"));
  }