public boolean isAbsolute() {
    return mUri.isAbsolute();
  }
@Test
  public void isAbsoluteTests() {
    assertTrue(new AlluxioURI("file:/a").isAbsolute());
    assertTrue(new AlluxioURI("file://localhost/a").isAbsolute());
    assertFalse(new AlluxioURI("//localhost/a").isAbsolute());
    assertFalse(new AlluxioURI("//localhost/").isAbsolute());
    assertFalse(new AlluxioURI("/").isAbsolute());
  }