public ProgressListenerChain(ProgressListener... listeners) {
for (ProgressListener listener : listeners) addProgressListener(listener);
}
/**
* Adds the specified progress listener to the list of listeners receiving updates about this
* transfer's progress.
*
* @param listener The progress listener to add.
*/
public synchronized void addProgressListener(ProgressListener listener) {
progressListenerChain.addProgressListener(listener);
}