bundles/org.eclipse.ui.navigator.resources/src/org/eclipse/ui/internal/navigator/resources/actions/WorkingSetActionProvider.java - platform/eclipse.platform.ui - Git at Google

 /*******************************************************************************
  * Copyright (c) 2006, 2009 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  *     IBM Corporation - initial API and implementation
  *     anton.leherbauer@windriver.com - bug 212389 [CommonNavigator] working set issues:
  *         missing project, window working set inconsistency
  *******************************************************************************/

 package org.eclipse.ui.internal.navigator.resources.actions;

 import org.eclipse.core.resources.ResourcesPlugin;
 import org.eclipse.jface.util.IPropertyChangeListener;
 import org.eclipse.jface.util.PropertyChangeEvent;
 import org.eclipse.ui.IActionBars;
 import org.eclipse.ui.IAggregateWorkingSet;
 import org.eclipse.ui.IMemento;
 import org.eclipse.ui.IWorkbenchPreferenceConstants;
 import org.eclipse.ui.IWorkingSet;
 import org.eclipse.ui.IWorkingSetManager;
 import org.eclipse.ui.PlatformUI;
 import org.eclipse.ui.ResourceWorkingSetFilter;
 import org.eclipse.ui.actions.WorkingSetFilterActionGroup;
 import org.eclipse.ui.internal.navigator.resources.plugin.WorkbenchNavigatorMessages;
 import org.eclipse.ui.internal.navigator.workingsets.WorkingSetsContentProvider;
 import org.eclipse.ui.navigator.CommonActionProvider;
 import org.eclipse.ui.navigator.CommonViewer;
 import org.eclipse.ui.navigator.ICommonActionExtensionSite;
 import org.eclipse.ui.navigator.IExtensionActivationListener;
 import org.eclipse.ui.navigator.IExtensionStateModel;
 import org.eclipse.ui.navigator.INavigatorContentService;

 /**
  * @since 3.2
  *
  */
 public class WorkingSetActionProvider extends CommonActionProvider {

 	private static final String TAG_CURRENT_WORKING_SET_NAME = "currentWorkingSetName"; //$NON-NLS-1$

 	private boolean contributedToViewMenu = false;

 	private CommonViewer viewer;

 	private INavigatorContentService contentService;

 	private WorkingSetFilterActionGroup workingSetActionGroup;
 	private WorkingSetRootModeActionGroup workingSetRootModeActionGroup;

 	private Object originalViewerInput = ResourcesPlugin.getWorkspace().getRoot();

 	private IExtensionStateModel extensionStateModel;

 	private final ResourceWorkingSetFilter workingSetFilter = new ResourceWorkingSetFilter();
 	private boolean filterAdded;

 	private boolean emptyWorkingSet;
 	private IWorkingSet workingSet;

 	private IPropertyChangeListener topLevelModeListener;

 	/**
 	 * Provides a smart listener to monitor changes to the Working Set Manager.
 	 *
 	 */
 	public class WorkingSetManagerListener implements IPropertyChangeListener {

 		private boolean listening = false;

 		/*
 		 * (non-Javadoc)
 		 *
 		 * @see
 		 * org.eclipse.jface.util.IPropertyChangeListener#propertyChange(org
 		 * .eclipse.jface.util.PropertyChangeEvent)
 		 */
 		public void propertyChange(PropertyChangeEvent event) {
 			String property = event.getProperty();
 			Object newValue = event.getNewValue();
 			Object oldValue = event.getOldValue();

 			String newLabel = null;
 			if (IWorkingSetManager.CHANGE_WORKING_SET_REMOVE.equals(property) && oldValue == workingSet) {
 				newLabel = ""; //$NON-NLS-1$
 				setWorkingSet(null);
 			} else if (IWorkingSetManager.CHANGE_WORKING_SET_NAME_CHANGE.equals(property) && newValue == workingSet) {
 				newLabel = workingSet.getLabel();
 			} else if (IWorkingSetManager.CHANGE_WORKING_SET_CONTENT_CHANGE.equals(property) && newValue == workingSet) {
 				if (workingSet.isAggregateWorkingSet() && workingSet.isEmpty()) {
 					// act as if the working set has been made null
 					if (!emptyWorkingSet) {
 						emptyWorkingSet = true;
 						workingSetFilter.setWorkingSet(null);
 						newLabel = null;
 					}
 				} else {
 					// we've gone from empty to non-empty on our set.
 					// Restore it.
 					if (emptyWorkingSet) {
 						emptyWorkingSet = false;
 						workingSetFilter.setWorkingSet(workingSet);
 						newLabel = workingSet.getLabel();
 					}
 				}
 			}
 			if (viewer != null) {
 				if (newLabel != null)
 					viewer.getCommonNavigator().setWorkingSetLabel(newLabel);
 				viewer.getFrameList().reset();
 				viewer.refresh();
 			}
 		}

 		/**
 		 * Begin listening to the correct source if not already listening.
 		 */
 		public synchronized void listen() {
 			if (!listening) {
 				PlatformUI.getWorkbench().getWorkingSetManager().addPropertyChangeListener(managerChangeListener);
 				listening = true;
 			}
 		}

 		/**
 		 * Begin listening to the correct source if not already listening.
 		 */
 		public synchronized void ignore() {
 			if (listening) {
 				PlatformUI.getWorkbench().getWorkingSetManager().removePropertyChangeListener(managerChangeListener);
 				listening = false;
 			}
 		}
 	}

 	private IPropertyChangeListener filterChangeListener = new IPropertyChangeListener() {
 		public void propertyChange(PropertyChangeEvent event) {
 			IWorkingSet newWorkingSet = (IWorkingSet) event.getNewValue();

 			setWorkingSet(newWorkingSet);
 			if (newWorkingSet != null) {
 				if (!contentService.isActive(WorkingSetsContentProvider.EXTENSION_ID)) {
 					contentService.getActivationService().activateExtensions(
 							new String[] { WorkingSetsContentProvider.EXTENSION_ID }, false);
 					contentService.getActivationService().persistExtensionActivations();
 				}
 				if (newWorkingSet.isAggregateWorkingSet()) {
 					IAggregateWorkingSet agWs = (IAggregateWorkingSet) newWorkingSet;
 					IWorkingSet[] comps = agWs.getComponents();
 					if (comps.length > 1) {
 						viewer.getCommonNavigator().setWorkingSetLabel(
 								WorkbenchNavigatorMessages.WorkingSetActionProvider_multipleWorkingSets);
 					} else if (comps.length > 0) {
 						viewer.getCommonNavigator().setWorkingSetLabel(comps[0].getLabel());
 					} else {
 						viewer.getCommonNavigator().setWorkingSetLabel(null);
 					}
 				} else
 					viewer.getCommonNavigator().setWorkingSetLabel(workingSet.getLabel());
 			} else {
 				viewer.getCommonNavigator().setWorkingSetLabel(null);
 			}

 			viewer.getFrameList().reset();
 		}
 	};

 	private WorkingSetManagerListener managerChangeListener = new WorkingSetManagerListener();

 	private IExtensionActivationListener activationListener = new IExtensionActivationListener() {

 		private IWorkingSet savedWorkingSet;

 		public void onExtensionActivation(String aViewerId, String[] theNavigatorExtensionIds, boolean isActive) {

 			for (int i = 0; i < theNavigatorExtensionIds.length; i++) {
 				if (WorkingSetsContentProvider.EXTENSION_ID.equals(theNavigatorExtensionIds[i])) {
 					if (isActive) {
 						extensionStateModel = contentService.findStateModel(WorkingSetsContentProvider.EXTENSION_ID);
 						workingSetRootModeActionGroup.setStateModel(extensionStateModel);
 						extensionStateModel.addPropertyChangeListener(topLevelModeListener);

 						if (savedWorkingSet != null) {
 							setWorkingSet(savedWorkingSet);
 							workingSetActionGroup.setWorkingSet(savedWorkingSet);
 						}
 						managerChangeListener.listen();

 					} else {
 						savedWorkingSet = workingSet;
 						setWorkingSet(null);
 						viewer.getCommonNavigator().setWorkingSetLabel(null);
 						managerChangeListener.ignore();
 						workingSetActionGroup.setWorkingSet(null);
 						workingSetRootModeActionGroup.setShowTopLevelWorkingSets(false);
 						extensionStateModel.removePropertyChangeListener(topLevelModeListener);

 					}
 				}
 			}
 		}

 	};

 	/*
 	 * (non-Javadoc)
 	 *
 	 * @see
 	 * org.eclipse.ui.navigator.CommonActionProvider#init(org.eclipse.ui.navigator
 	 * .ICommonActionExtensionSite)
 	 */
 	public void init(ICommonActionExtensionSite aSite) {
 		viewer = (CommonViewer) aSite.getStructuredViewer();
 		contentService = aSite.getContentService();

 		extensionStateModel = contentService.findStateModel(WorkingSetsContentProvider.EXTENSION_ID);

 		workingSetActionGroup = new WorkingSetFilterActionGroup(aSite.getViewSite().getShell(), filterChangeListener);
 		workingSetRootModeActionGroup = new WorkingSetRootModeActionGroup(viewer, extensionStateModel);

 		topLevelModeListener = new IPropertyChangeListener() {
 			public void propertyChange(PropertyChangeEvent event) {
 				setWorkingSet(workingSet);
 				viewer.getFrameList().reset();
 			}
 		};

 		if (contentService.isActive(WorkingSetsContentProvider.EXTENSION_ID)) {
 			managerChangeListener.listen();
 			extensionStateModel.addPropertyChangeListener(topLevelModeListener);
 		}

 		contentService.getActivationService().addExtensionActivationListener(activationListener);

 	}

 	/**
 	 * Restores the working set filter from the persistence store.
 	 */
 	protected void initWorkingSetFilter(String workingSetName) {
 		IWorkingSet workingSet = null;

 		if (workingSetName != null && workingSetName.length() > 0) {
 			IWorkingSetManager workingSetManager = PlatformUI.getWorkbench().getWorkingSetManager();
 			workingSet = workingSetManager.getWorkingSet(workingSetName);
 		} else if (PlatformUI.getPreferenceStore().getBoolean(
 				IWorkbenchPreferenceConstants.USE_WINDOW_WORKING_SET_BY_DEFAULT)) {
 			// use the window set by default if the global preference is set
 			workingSet = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage().getAggregateWorkingSet();
 		}

 		if (workingSet != null) {
 			workingSetFilter.setWorkingSet(workingSet);
 			internalSetWorkingSet(workingSet);
 			workingSetActionGroup.setWorkingSet(workingSet);
 		}
 	}

 	/**
 	 * Set current active working set.
 	 *
 	 * @param workingSet
 	 *            working set to be activated, may be <code>null</code>
 	 */
 	protected void setWorkingSet(IWorkingSet workingSet) {
 		internalSetWorkingSet(workingSet);

 		workingSetFilter.setWorkingSet(emptyWorkingSet ? null : workingSet);

 		if (viewer != null) {
 			if (workingSet == null || emptyWorkingSet
 					|| !extensionStateModel.getBooleanProperty(WorkingSetsContentProvider.SHOW_TOP_LEVEL_WORKING_SETS)) {
 				if (viewer.getInput() != originalViewerInput) {
 					viewer.setInput(originalViewerInput);
 				}
 				if (!filterAdded) {
 					viewer.addFilter(workingSetFilter);
 					filterAdded = true;
 				} else {
 					viewer.refresh();
 				}
 			} else {
 				viewer.removeFilter(workingSetFilter);
 				filterAdded = false;
 				if (!workingSet.isAggregateWorkingSet()) {
 					IWorkingSetManager workingSetManager = PlatformUI.getWorkbench().getWorkingSetManager();
 					viewer.setInput(workingSetManager.createAggregateWorkingSet(
 							"", "", new IWorkingSet[] { workingSet })); //$NON-NLS-1$ //$NON-NLS-2$
 				} else {
 					viewer.setInput(workingSet);
 				}
 			}
 		}
 	}

 	private void internalSetWorkingSet(IWorkingSet workingSet) {
 		this.workingSet = workingSet;
 		emptyWorkingSet = workingSet != null && workingSet.isAggregateWorkingSet() && workingSet.isEmpty();
 	}

 	/*
 	 * (non-Javadoc)
 	 *
 	 * @see
 	 * org.eclipse.ui.navigator.CommonActionProvider#restoreState(org.eclipse
 	 * .ui.IMemento)
 	 */
 	public void restoreState(IMemento aMemento) {
 		super.restoreState(aMemento);

 		boolean showWorkingSets = true;
 		if (aMemento != null) {
 			Integer showWorkingSetsInt = aMemento.getInteger(WorkingSetsContentProvider.SHOW_TOP_LEVEL_WORKING_SETS);
 			showWorkingSets = showWorkingSetsInt == null || showWorkingSetsInt.intValue() == 1;
 			extensionStateModel.setBooleanProperty(WorkingSetsContentProvider.SHOW_TOP_LEVEL_WORKING_SETS,
 					showWorkingSets);
 			workingSetRootModeActionGroup.setShowTopLevelWorkingSets(showWorkingSets);

 			String lastWorkingSetName = aMemento.getString(TAG_CURRENT_WORKING_SET_NAME);
 			initWorkingSetFilter(lastWorkingSetName);
 		} else {
 			showWorkingSets = false;

 			extensionStateModel.setBooleanProperty(WorkingSetsContentProvider.SHOW_TOP_LEVEL_WORKING_SETS,
 					showWorkingSets);
 			workingSetRootModeActionGroup.setShowTopLevelWorkingSets(showWorkingSets);
 		}
 	}

 	/*
 	 * (non-Javadoc)
 	 *
 	 * @see
 	 * org.eclipse.ui.navigator.CommonActionProvider#saveState(org.eclipse.ui
 	 * .IMemento)
 	 */
 	public void saveState(IMemento aMemento) {
 		super.saveState(aMemento);

 		if (aMemento != null) {
 			int showWorkingSets = extensionStateModel
 					.getBooleanProperty(WorkingSetsContentProvider.SHOW_TOP_LEVEL_WORKING_SETS) ? 1 : 0;
 			aMemento.putInteger(WorkingSetsContentProvider.SHOW_TOP_LEVEL_WORKING_SETS, showWorkingSets);

 			if (workingSet != null) {
 				aMemento.putString(TAG_CURRENT_WORKING_SET_NAME, workingSet.getName());
 			}
 		}

 	}

 	/*
 	 * (non-Javadoc)
 	 *
 	 * @see
 	 * org.eclipse.ui.actions.ActionGroup#fillActionBars(org.eclipse.ui.IActionBars
 	 * )
 	 */
 	public void fillActionBars(IActionBars actionBars) {
 		if (!contributedToViewMenu) {
 			try {
 				super.fillActionBars(actionBars);
 				workingSetActionGroup.fillActionBars(actionBars);
 				if (workingSetRootModeActionGroup != null) {
 					workingSetRootModeActionGroup.fillActionBars(actionBars);
 				}
 			} finally {
 				contributedToViewMenu = true;
 			}
 		}
 	}

 	/*
 	 * (non-Javadoc)
 	 *
 	 * @see org.eclipse.ui.actions.ActionGroup#dispose()
 	 */
 	public void dispose() {
 		super.dispose();
 		workingSetActionGroup.dispose();
 		if (workingSetRootModeActionGroup != null) {
 			workingSetRootModeActionGroup.dispose();
 		}

 		managerChangeListener.ignore();
 		extensionStateModel.removePropertyChangeListener(topLevelModeListener);

 		contentService.getActivationService().removeExtensionActivationListener(activationListener);
 	}

 	/**
 	 * This is used only for the tests.
 	 *
 	 * @return a PropertyChangeListener
 	 */
 	public IPropertyChangeListener getFilterChangeListener() {
 		return filterChangeListener;
 	}

 }
	/*******************************************************************************
	* Copyright (c) 2006, 2009 IBM Corporation and others.
	* All rights reserved. This program and the accompanying materials
	* are made available under the terms of the Eclipse Public License v1.0
	* which accompanies this distribution, and is available at
	* http://www.eclipse.org/legal/epl-v10.html
	*
	* Contributors:
	* IBM Corporation - initial API and implementation
	* anton.leherbauer@windriver.com - bug 212389 [CommonNavigator] working set issues:
	* missing project, window working set inconsistency
	*******************************************************************************/

	package org.eclipse.ui.internal.navigator.resources.actions;

	import org.eclipse.core.resources.ResourcesPlugin;
	import org.eclipse.jface.util.IPropertyChangeListener;
	import org.eclipse.jface.util.PropertyChangeEvent;
	import org.eclipse.ui.IActionBars;
	import org.eclipse.ui.IAggregateWorkingSet;
	import org.eclipse.ui.IMemento;
	import org.eclipse.ui.IWorkbenchPreferenceConstants;
	import org.eclipse.ui.IWorkingSet;
	import org.eclipse.ui.IWorkingSetManager;
	import org.eclipse.ui.PlatformUI;
	import org.eclipse.ui.ResourceWorkingSetFilter;
	import org.eclipse.ui.actions.WorkingSetFilterActionGroup;
	import org.eclipse.ui.internal.navigator.resources.plugin.WorkbenchNavigatorMessages;
	import org.eclipse.ui.internal.navigator.workingsets.WorkingSetsContentProvider;
	import org.eclipse.ui.navigator.CommonActionProvider;
	import org.eclipse.ui.navigator.CommonViewer;
	import org.eclipse.ui.navigator.ICommonActionExtensionSite;
	import org.eclipse.ui.navigator.IExtensionActivationListener;
	import org.eclipse.ui.navigator.IExtensionStateModel;
	import org.eclipse.ui.navigator.INavigatorContentService;

	/**
	* @since 3.2
	*
	*/
	public class WorkingSetActionProvider extends CommonActionProvider {

	private static final String TAG_CURRENT_WORKING_SET_NAME = "currentWorkingSetName"; //$NON-NLS-1$

	private boolean contributedToViewMenu = false;

	private CommonViewer viewer;

	private INavigatorContentService contentService;

	private WorkingSetFilterActionGroup workingSetActionGroup;
	private WorkingSetRootModeActionGroup workingSetRootModeActionGroup;

	private Object originalViewerInput = ResourcesPlugin.getWorkspace().getRoot();

	private IExtensionStateModel extensionStateModel;

	private final ResourceWorkingSetFilter workingSetFilter = new ResourceWorkingSetFilter();
	private boolean filterAdded;

	private boolean emptyWorkingSet;
	private IWorkingSet workingSet;

	private IPropertyChangeListener topLevelModeListener;

	/**
	* Provides a smart listener to monitor changes to the Working Set Manager.
	*
	*/
	public class WorkingSetManagerListener implements IPropertyChangeListener {

	private boolean listening = false;

	/*
	* (non-Javadoc)
	*
	* @see
	* org.eclipse.jface.util.IPropertyChangeListener#propertyChange(org
	* .eclipse.jface.util.PropertyChangeEvent)
	*/
	public void propertyChange(PropertyChangeEvent event) {
	String property = event.getProperty();
	Object newValue = event.getNewValue();
	Object oldValue = event.getOldValue();

	String newLabel = null;
	if (IWorkingSetManager.CHANGE_WORKING_SET_REMOVE.equals(property) && oldValue == workingSet) {
	newLabel = ""; //$NON-NLS-1$
	setWorkingSet(null);
	} else if (IWorkingSetManager.CHANGE_WORKING_SET_NAME_CHANGE.equals(property) && newValue == workingSet) {
	newLabel = workingSet.getLabel();
	} else if (IWorkingSetManager.CHANGE_WORKING_SET_CONTENT_CHANGE.equals(property) && newValue == workingSet) {
	if (workingSet.isAggregateWorkingSet() && workingSet.isEmpty()) {
	// act as if the working set has been made null
	if (!emptyWorkingSet) {
	emptyWorkingSet = true;
	workingSetFilter.setWorkingSet(null);
	newLabel = null;
	}
	} else {
	// we've gone from empty to non-empty on our set.
	// Restore it.
	if (emptyWorkingSet) {
	emptyWorkingSet = false;
	workingSetFilter.setWorkingSet(workingSet);
	newLabel = workingSet.getLabel();
	}
	}
	}
	if (viewer != null) {
	if (newLabel != null)
	viewer.getCommonNavigator().setWorkingSetLabel(newLabel);
	viewer.getFrameList().reset();
	viewer.refresh();
	}
	}

	/**
	* Begin listening to the correct source if not already listening.
	*/
	public synchronized void listen() {
	if (!listening) {
	PlatformUI.getWorkbench().getWorkingSetManager().addPropertyChangeListener(managerChangeListener);
	listening = true;
	}
	}

	/**
	* Begin listening to the correct source if not already listening.
	*/
	public synchronized void ignore() {
	if (listening) {
	PlatformUI.getWorkbench().getWorkingSetManager().removePropertyChangeListener(managerChangeListener);
	listening = false;
	}
	}
	}

	private IPropertyChangeListener filterChangeListener = new IPropertyChangeListener() {
	public void propertyChange(PropertyChangeEvent event) {
	IWorkingSet newWorkingSet = (IWorkingSet) event.getNewValue();

	setWorkingSet(newWorkingSet);
	if (newWorkingSet != null) {
	if (!contentService.isActive(WorkingSetsContentProvider.EXTENSION_ID)) {
	contentService.getActivationService().activateExtensions(
	new String[] { WorkingSetsContentProvider.EXTENSION_ID }, false);
	contentService.getActivationService().persistExtensionActivations();
	}
	if (newWorkingSet.isAggregateWorkingSet()) {
	IAggregateWorkingSet agWs = (IAggregateWorkingSet) newWorkingSet;
	IWorkingSet[] comps = agWs.getComponents();
	if (comps.length > 1) {
	viewer.getCommonNavigator().setWorkingSetLabel(
	WorkbenchNavigatorMessages.WorkingSetActionProvider_multipleWorkingSets);
	} else if (comps.length > 0) {
	viewer.getCommonNavigator().setWorkingSetLabel(comps[0].getLabel());
	} else {
	viewer.getCommonNavigator().setWorkingSetLabel(null);
	}
	} else
	viewer.getCommonNavigator().setWorkingSetLabel(workingSet.getLabel());
	} else {
	viewer.getCommonNavigator().setWorkingSetLabel(null);
	}

	viewer.getFrameList().reset();
	}
	};

	private WorkingSetManagerListener managerChangeListener = new WorkingSetManagerListener();

	private IExtensionActivationListener activationListener = new IExtensionActivationListener() {

	private IWorkingSet savedWorkingSet;

	public void onExtensionActivation(String aViewerId, String[] theNavigatorExtensionIds, boolean isActive) {

	for (int i = 0; i < theNavigatorExtensionIds.length; i++) {
	if (WorkingSetsContentProvider.EXTENSION_ID.equals(theNavigatorExtensionIds[i])) {
	if (isActive) {
	extensionStateModel = contentService.findStateModel(WorkingSetsContentProvider.EXTENSION_ID);
	workingSetRootModeActionGroup.setStateModel(extensionStateModel);
	extensionStateModel.addPropertyChangeListener(topLevelModeListener);

	if (savedWorkingSet != null) {
	setWorkingSet(savedWorkingSet);
	workingSetActionGroup.setWorkingSet(savedWorkingSet);
	}
	managerChangeListener.listen();

	} else {
	savedWorkingSet = workingSet;
	setWorkingSet(null);
	viewer.getCommonNavigator().setWorkingSetLabel(null);
	managerChangeListener.ignore();
	workingSetActionGroup.setWorkingSet(null);
	workingSetRootModeActionGroup.setShowTopLevelWorkingSets(false);
	extensionStateModel.removePropertyChangeListener(topLevelModeListener);

	}
	}
	}
	}

	};

	/*
	* (non-Javadoc)
	*
	* @see
	* org.eclipse.ui.navigator.CommonActionProvider#init(org.eclipse.ui.navigator
	* .ICommonActionExtensionSite)
	*/
	public void init(ICommonActionExtensionSite aSite) {
	viewer = (CommonViewer) aSite.getStructuredViewer();
	contentService = aSite.getContentService();

	extensionStateModel = contentService.findStateModel(WorkingSetsContentProvider.EXTENSION_ID);

	workingSetActionGroup = new WorkingSetFilterActionGroup(aSite.getViewSite().getShell(), filterChangeListener);
	workingSetRootModeActionGroup = new WorkingSetRootModeActionGroup(viewer, extensionStateModel);

	topLevelModeListener = new IPropertyChangeListener() {
	public void propertyChange(PropertyChangeEvent event) {
	setWorkingSet(workingSet);
	viewer.getFrameList().reset();
	}
	};

	if (contentService.isActive(WorkingSetsContentProvider.EXTENSION_ID)) {
	managerChangeListener.listen();
	extensionStateModel.addPropertyChangeListener(topLevelModeListener);
	}

	contentService.getActivationService().addExtensionActivationListener(activationListener);

	}

	/**
	* Restores the working set filter from the persistence store.
	*/
	protected void initWorkingSetFilter(String workingSetName) {
	IWorkingSet workingSet = null;

	if (workingSetName != null && workingSetName.length() > 0) {
	IWorkingSetManager workingSetManager = PlatformUI.getWorkbench().getWorkingSetManager();
	workingSet = workingSetManager.getWorkingSet(workingSetName);
	} else if (PlatformUI.getPreferenceStore().getBoolean(
	IWorkbenchPreferenceConstants.USE_WINDOW_WORKING_SET_BY_DEFAULT)) {
	// use the window set by default if the global preference is set
	workingSet = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage().getAggregateWorkingSet();
	}

	if (workingSet != null) {
	workingSetFilter.setWorkingSet(workingSet);
	internalSetWorkingSet(workingSet);
	workingSetActionGroup.setWorkingSet(workingSet);
	}
	}

	/**
	* Set current active working set.
	*
	* @param workingSet
	* working set to be activated, may be <code>null</code>
	*/
	protected void setWorkingSet(IWorkingSet workingSet) {
	internalSetWorkingSet(workingSet);

	workingSetFilter.setWorkingSet(emptyWorkingSet ? null : workingSet);

	if (viewer != null) {
	if (workingSet == null \|\| emptyWorkingSet
	\|\| !extensionStateModel.getBooleanProperty(WorkingSetsContentProvider.SHOW_TOP_LEVEL_WORKING_SETS)) {
	if (viewer.getInput() != originalViewerInput) {
	viewer.setInput(originalViewerInput);
	}
	if (!filterAdded) {
	viewer.addFilter(workingSetFilter);
	filterAdded = true;
	} else {
	viewer.refresh();
	}
	} else {
	viewer.removeFilter(workingSetFilter);
	filterAdded = false;
	if (!workingSet.isAggregateWorkingSet()) {
	IWorkingSetManager workingSetManager = PlatformUI.getWorkbench().getWorkingSetManager();
	viewer.setInput(workingSetManager.createAggregateWorkingSet(
	"", "", new IWorkingSet[] { workingSet })); //$NON-NLS-1$ //$NON-NLS-2$
	} else {
	viewer.setInput(workingSet);
	}
	}
	}
	}

	private void internalSetWorkingSet(IWorkingSet workingSet) {
	this.workingSet = workingSet;
	emptyWorkingSet = workingSet != null && workingSet.isAggregateWorkingSet() && workingSet.isEmpty();
	}

	/*
	* (non-Javadoc)
	*
	* @see
	* org.eclipse.ui.navigator.CommonActionProvider#restoreState(org.eclipse
	* .ui.IMemento)
	*/
	public void restoreState(IMemento aMemento) {
	super.restoreState(aMemento);

	boolean showWorkingSets = true;
	if (aMemento != null) {
	Integer showWorkingSetsInt = aMemento.getInteger(WorkingSetsContentProvider.SHOW_TOP_LEVEL_WORKING_SETS);
	showWorkingSets = showWorkingSetsInt == null \|\| showWorkingSetsInt.intValue() == 1;
	extensionStateModel.setBooleanProperty(WorkingSetsContentProvider.SHOW_TOP_LEVEL_WORKING_SETS,
	showWorkingSets);
	workingSetRootModeActionGroup.setShowTopLevelWorkingSets(showWorkingSets);

	String lastWorkingSetName = aMemento.getString(TAG_CURRENT_WORKING_SET_NAME);
	initWorkingSetFilter(lastWorkingSetName);
	} else {
	showWorkingSets = false;

	extensionStateModel.setBooleanProperty(WorkingSetsContentProvider.SHOW_TOP_LEVEL_WORKING_SETS,
	showWorkingSets);
	workingSetRootModeActionGroup.setShowTopLevelWorkingSets(showWorkingSets);
	}
	}

	/*
	* (non-Javadoc)
	*
	* @see
	* org.eclipse.ui.navigator.CommonActionProvider#saveState(org.eclipse.ui
	* .IMemento)
	*/
	public void saveState(IMemento aMemento) {
	super.saveState(aMemento);

	if (aMemento != null) {
	int showWorkingSets = extensionStateModel
	.getBooleanProperty(WorkingSetsContentProvider.SHOW_TOP_LEVEL_WORKING_SETS) ? 1 : 0;
	aMemento.putInteger(WorkingSetsContentProvider.SHOW_TOP_LEVEL_WORKING_SETS, showWorkingSets);

	if (workingSet != null) {
	aMemento.putString(TAG_CURRENT_WORKING_SET_NAME, workingSet.getName());
	}
	}

	}

	/*
	* (non-Javadoc)
	*
	* @see
	* org.eclipse.ui.actions.ActionGroup#fillActionBars(org.eclipse.ui.IActionBars
	* )
	*/
	public void fillActionBars(IActionBars actionBars) {
	if (!contributedToViewMenu) {
	try {
	super.fillActionBars(actionBars);
	workingSetActionGroup.fillActionBars(actionBars);
	if (workingSetRootModeActionGroup != null) {
	workingSetRootModeActionGroup.fillActionBars(actionBars);
	}
	} finally {
	contributedToViewMenu = true;
	}
	}
	}

	/*
	* (non-Javadoc)
	*
	* @see org.eclipse.ui.actions.ActionGroup#dispose()
	*/
	public void dispose() {
	super.dispose();
	workingSetActionGroup.dispose();
	if (workingSetRootModeActionGroup != null) {
	workingSetRootModeActionGroup.dispose();
	}

	managerChangeListener.ignore();
	extensionStateModel.removePropertyChangeListener(topLevelModeListener);

	contentService.getActivationService().removeExtensionActivationListener(activationListener);
	}

	/**
	* This is used only for the tests.
	*
	* @return a PropertyChangeListener
	*/
	public IPropertyChangeListener getFilterChangeListener() {
	return filterChangeListener;
	}

	}