public boolean isPathAbsolute() {
    int start = hasWindowsDrive(mUri.getPath(), true) ? 3 : 0;
    return mUri.getPath().startsWith(SEPARATOR, start);
  }
@Test
  public void isPathAbsoluteTests() {
    assertFalse(new AlluxioURI(".").isPathAbsolute());
    assertTrue(new AlluxioURI("/").isPathAbsolute());
    assertTrue(new AlluxioURI("file:/").isPathAbsolute());
    assertTrue(new AlluxioURI("file://localhost/").isPathAbsolute());
    assertTrue(new AlluxioURI("file://localhost/a/b").isPathAbsolute());
    assertFalse(new AlluxioURI("a/b").isPathAbsolute());
    assertTrue(new AlluxioURI("C:\\\\a\\b").isPathAbsolute());
  }