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
*     IBM Corporation - initial API and implementation
 ******************************************************************************/
package org.eclipse.ui.internal.navigator;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.eclipse.core.runtime.Assert;
import org.eclipse.core.runtime.preferences.IEclipsePreferences;
import org.eclipse.jface.viewers.ViewerFilter;
import org.eclipse.ui.internal.navigator.filters.CommonFilterDescriptor;
import org.eclipse.ui.internal.navigator.filters.CommonFilterDescriptorManager;
import org.eclipse.ui.internal.navigator.filters.SkeletonViewerFilter;
import org.eclipse.ui.navigator.ICommonFilterDescriptor;
import org.eclipse.ui.navigator.INavigatorFilterService;
/**
 * @since 3.2
 * 
 */
public class NavigatorFilterService implements INavigatorFilterService {
	private static final ViewerFilter[] NO_FILTERS = new ViewerFilter[0];
	private static final String ACTIVATION_KEY = ".filterActivation"; 
	private static final String DELIM = ":"; 
	private final NavigatorContentService contentService;
	
	private final Map declaredViewerFilters = new HashMap();