@Override public boolean isModifiedImpl(){
  if (_isDigestModified || _depend.isModified()) {
    _changeSequence.incrementAndGet();
    return true;
  }
 else   return false;
}

@ Override public boolean isModifiedImpl ( ) { if ( _isDigestModified || _depend . isModified ( ) ) { _changeSequence . incrementAndGet ( ) ; return true ; } else return false ; }
returns true if the dependency is modified .
