static String getScheme( String[] schemes, String fileName ) {
    for (String scheme : schemes) {
      if ( fileName.startsWith( scheme + ":" ) ) {
        return scheme;
      }
    }
    return null;
  }
@Test
  public void testCheckForSchemeIfRelativePath() {
    String[] schemes = {"file"};
    String vfsFilename = "\"/tmp/acltest/\"";

    assertNull( KettleVFS.getScheme( schemes, vfsFilename ) );
  }