FilterObservable¶

public class FilterObservable¶

Utility class maintaining a list of FilterObserver instances and the required methods to notify these instances about filter changes. This class is not thread-safe.

Author: swrede, jwienke

Methods¶

addObserver¶

public boolean addObserver(FilterObserver observer)¶

If not already registered, adds this observer to the list of registered observers.

Parameters: observer – observer to add
Returns: true if the observer was actually newly registered.

clearObservers¶

public void clearObservers()¶: Removes all registered observers.

notifyObservers¶

public void notifyObservers(Filter filter, FilterAction action)¶

Notifies all registered observers about a change to a Filter.

Parameters

filter – the filter that is affected, not null
action – the action performed to the filter, not null

removeObserver¶

public boolean removeObserver(FilterObserver observer)¶

Removes a potentially registered observer.

Parameters: observer – the observer to remove
Returns: true if the observer was previously registered and is now unregistered