Bug 292813 [CommonNavigator] Please provide an API for enabling and disabling common navigator filters programmatically
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US) AppleWebKit/532.0 (KHTML, like Gecko) Chrome/3.0.195.27 Safari/532.0 Build Identifier: M20090917-0800 Recently I had a case where I wanted to enable/disable a common navigator filter from code and found it very difficult. I basically ended up using the code in org.eclipse.ui.internal.navigator.filters.UpdateActiveFiltersOperation as a reference and ended up manually creating or pruning an array, as well as adding/removing a corresponding ViewerFilter to/from and refreshing the underlying viewer. This seems quite complicated and I think others could benefit from it being API similar to how API was recently added to enable and disable content contributions (via INavigatorContentService#activateExtensions and INavigatorContentService#deactivateExtensions). Reproducible: Always
bundles/org.eclipse.ui.navigator/src/org/eclipse/ui/internal/navigator/NavigatorFilterService.java
private final Set enforcedViewerFilters = new HashSet();
	
	private final Set activeFilters = new HashSet();
	/**
	 * @param aContentService
	 *            The corresponding content service
	 */
	public NavigatorFilterService(NavigatorContentService aContentService) {
		contentService = aContentService;
		restoreFilterActivation();
	}
	private synchronized void restoreFilterActivation() {
		try {
			IEclipsePreferences prefs = NavigatorContentService.getPreferencesRoot();
			if (prefs.get(getFilterActivationPreferenceKey(), null) != null) {
				String activatedFiltersPreferenceValue = prefs
						.get(getFilterActivationPreferenceKey(), null);
				String[] activeFilterIds = activatedFiltersPreferenceValue
						.split(DELIM);
				for (int i = 0; i < activeFilterIds.length; i++) {
					activeFilters.add(activeFilterIds[i]);
				}
			} else {
				ICommonFilterDescriptor[] visibleFilterDescriptors = getVisibleFilterDescriptors();
				for (int i = 0; i < visibleFilterDescriptors.length; i++) {
					if (visibleFilterDescriptors[i].isActiveByDefault()) {
						activeFilters.add(visibleFilterDescriptors[i].getId());
					}
				}