rsb.filter

Class FilterObservable

java.lang.Object

rsb.filter.FilterObservable

public class FilterObservable
extends Object

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

Constructor Summary

Constructors

Constructor and Description
FilterObservable()

Method Summary

Methods

Modifier and Type	Method and Description
boolean	addObserver(FilterObserver observer) If not already registered, adds this observer to the list of registered observers.
void	clearObservers() Removes all registered observers.
void	notifyObservers(Filter filter, FilterAction action) Notifies all registered observers about a change to a Filter.
boolean	removeObserver(FilterObserver observer) Removes a potentially registered observer.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

FilterObservable

public FilterObservable()

Method Detail

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.

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

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

clearObservers

public void clearObservers()

Removes all registered observers.