public boolean handleSourceDelta(IResourceDelta _delta, IProgressMonitor _progressMonitor, Map _buildCache) {  return false; }
public void handleSourceDelta(IResourceDelta delta, IProgressMonitor progressMonitor, Map buildCache) {  }
  public boolean handleSourceDelta(IResourceDelta _delta, IProgressMonitor _progressMonitor, Map _buildCache) {    // do nothing    return false;  }