bundles/org.eclipse.ui.workbench/Eclipse UI/org/eclipse/ui/internal/WorkingSetManager.java - platform/eclipse.platform.ui - Git at Google

 package org.eclipse.ui.internal;
 /*
  * (c) Copyright IBM Corp. 2002.
  * All Rights Reserved.
  */

 import java.io.*;
 import java.util.*;

 import org.eclipse.core.runtime.IAdaptable;
 import org.eclipse.core.runtime.IPath;
 import org.eclipse.jface.dialogs.ErrorDialog;
 import org.eclipse.jface.dialogs.MessageDialog;
 import org.eclipse.jface.util.*;
 import org.eclipse.swt.widgets.Display;
 import org.eclipse.swt.widgets.Shell;
 import org.eclipse.ui.*;
 import org.eclipse.ui.dialogs.*;
 import org.eclipse.ui.internal.dialogs.WorkingSetEditWizard;
 import org.eclipse.ui.internal.dialogs.WorkingSetSelectionDialog;
 import org.eclipse.ui.internal.registry.WorkingSetRegistry;

 /**
  * A working set manager stores working sets and provides property
  * change notification when a working set is added or removed.
  * Working sets are persisted whenever one is added or removed.
  *
  * @see IWorkingSetManager
  * @since 2.0
  */
 public class WorkingSetManager implements IWorkingSetManager {
 	// Working set persistence
 	private static final String WORKING_SET_STATE_FILENAME = "workingsets.xml"; //$NON-NLS-1$
 	/**
 	 * Size of the list of most recently used working sets.
 	 */
 	private static final int MRU_SIZE = 5;

 	private SortedSet workingSets = new TreeSet(new WorkingSetComparator());
 	private List recentWorkingSets = new ArrayList();
 	private ListenerList propertyChangeListeners = new ListenerList();

 	/**
 	 * Implements IWorkingSetManager.
 	 *
 	 * @see org.eclipse.ui.IWorkingSetManager#addRecentWorkingSet(IWorkingSet)
 	 */
 	public void addRecentWorkingSet(IWorkingSet workingSet) {
 		recentWorkingSets.remove(workingSet);
 		recentWorkingSets.add(0, workingSet);
 		if (recentWorkingSets.size() > MRU_SIZE) {
 			recentWorkingSets.remove(MRU_SIZE);
 		}
 		saveState();
 	}
 	/**
 	 * Implements IWorkingSetManager.
 	 *
 	 * @see org.eclipse.ui.IWorkingSetManager#addWorkingSet(IWorkingSet)
 	 */
 	public void addWorkingSet(IWorkingSet workingSet) {
 		Assert.isTrue(!workingSets.contains(workingSet), "working set already registered"); //$NON-NLS-1$
 		workingSets.add(workingSet);
 		saveState();
 		firePropertyChange(CHANGE_WORKING_SET_ADD, null, workingSet);
 	}
 	/**
 	 * Implements IWorkingSetManager.
 	 *
 	 * @see org.eclipse.ui.IWorkingSetManager#addPropertyChangeListener(IPropertyChangeListener)
 	 */
 	public void addPropertyChangeListener(IPropertyChangeListener listener) {
 		propertyChangeListeners.add(listener);
 	}
 	/**
 	 * Implements IWorkingSetManager.
 	 *
 	 * @see org.eclipse.ui.IWorkingSetManager#createWorkingSet(String, IAdaptable[])
 	 */
 	public IWorkingSet createWorkingSet(String name, IAdaptable[] elements) {
 		return new WorkingSet(name, elements);
 	}
 	/**
 	 * @see org.eclipse.ui.IWorkingSetManager#createWorkingSetEditWizard(org.eclipse.ui.IWorkingSet)
 	 * @since 2.1
 	 */
 	public IWorkingSetEditWizard createWorkingSetEditWizard(IWorkingSet workingSet) {
 		String editPageId = ((WorkingSet) workingSet).getEditPageId();
 		WorkingSetRegistry registry = WorkbenchPlugin.getDefault().getWorkingSetRegistry();
 		IWorkingSetPage editPage = null;

 		if (editPageId != null) {
 			editPage = registry.getWorkingSetPage(editPageId);
 		}
 		if (editPage == null) {
 			editPage = registry.getDefaultWorkingSetPage();
 			if (editPage == null) {
 				return null;
 			}
 		}
 		WorkingSetEditWizard editWizard = new WorkingSetEditWizard(editPage);
 		editWizard.setSelection(workingSet);
 		return editWizard;
 	}
 	/**
 	 * @deprecated use createWorkingSetSelectionDialog(parent, true) instead
 	 */
 	public IWorkingSetSelectionDialog createWorkingSetSelectionDialog(Shell parent) {
 		return createWorkingSetSelectionDialog(parent, true);
 	}
 	/**
 	 * Implements IWorkingSetManager.
 	 *
 	 * @see org.eclipse.ui.IWorkingSetManager#createWorkingSetSelectionDialog(Shell, boolean)
 	 */
 	public IWorkingSetSelectionDialog createWorkingSetSelectionDialog(Shell parent, boolean multi) {
 		return new WorkingSetSelectionDialog(parent, multi);
 	}
 	/**
 	 * Tests the receiver and the object for equality
 	 *
 	 * @param object object to compare the receiver to
 	 * @return true=the object equals the receiver, it has the same
 	 * 	working sets. false otherwise
 	 */
 	public boolean equals(Object object) {
 		if (this == object) {
 			return true;
 		}
 		if (object instanceof WorkingSetManager) {
 			WorkingSetManager workingSetManager = (WorkingSetManager) object;
 			return workingSetManager.workingSets.equals(workingSets);
 		}
 		return false;
 	}
 	/**
 	 * Notify property change listeners about a change to the list of
 	 * working sets.
 	 *
 	 * @param changeId one of
 	 * 	IWorkingSetManager#CHANGE_WORKING_SET_ADD
 	 * 	IWorkingSetManager#CHANGE_WORKING_SET_REMOVE
 	 * 	IWorkingSetManager#CHANGE_WORKING_SET_CONTENT_CHANGE
 	 * 	IWorkingSetManager#CHANGE_WORKING_SET_NAME_CHANGE
 	 * @param oldValue the removed working set or null if a working set
 	 * 	was added or changed.
 	 * @param newValue the new or changed working set or null if a working
 	 * 	set was removed.
 	 */
 	private void firePropertyChange(String changeId, Object oldValue, Object newValue) {
 		final PropertyChangeEvent event = new PropertyChangeEvent(this, changeId, oldValue, newValue);

 		Display.getDefault().syncExec(new Runnable() {
 			public void run() {
 				Object[] listeners = propertyChangeListeners.getListeners();
 				for (int i = 0; i < listeners.length; i++) {
 					((IPropertyChangeListener) listeners[i]).propertyChange(event);
 				}
 			}
 		});
 	}
 	/**
 	 * Implements IWorkingSetManager.
 	 *
 	 * @see org.eclipse.ui.IWorkingSetManager#getRecentWorkingSets()
 	 */
 	public IWorkingSet[] getRecentWorkingSets() {
 		return (IWorkingSet[]) recentWorkingSets.toArray(new IWorkingSet[recentWorkingSets.size()]);
 	}
 	/**
 	 * Implements IWorkingSetManager.
 	 *
 	 * @see org.eclipse.ui.IWorkingSetManager#getWorkingSet(String)
 	 */
 	public IWorkingSet getWorkingSet(String name) {
 		if (name == null || workingSets == null)
 			return null;

 		Iterator iter = workingSets.iterator();
 		while (iter.hasNext()) {
 			IWorkingSet workingSet = (IWorkingSet) iter.next();
 			if (name.equals(workingSet.getName()))
 				return workingSet;
 		}
 		return null;
 	}
 	/**
 	 * Returns the hash code.
 	 *
 	 * @return the hash code.
 	 */
 	public int hashCode() {
 		return workingSets.hashCode();
 	}
 	/**
 	 * Implements IWorkingSetManager.
 	 *
 	 * @see org.eclipse.ui.IWorkingSetManager#getWorkingSets()
 	 */
 	public IWorkingSet[] getWorkingSets() {
 		return (IWorkingSet[]) workingSets.toArray(new IWorkingSet[workingSets.size()]);
 	}
 	/**
 	 * Returns the file used as the persistence store
 	 *
 	 * @return the file used as the persistence store
 	 */
 	private File getWorkingSetStateFile() {
 		IPath path = WorkbenchPlugin.getDefault().getStateLocation();
 		path = path.append(WORKING_SET_STATE_FILENAME);
 		return path.toFile();
 	}
 	/**
 	 * Implements IWorkingSetManager.
 	 *
 	 * @see org.eclipse.ui.IWorkingSetManager#removePropertyChangeListener(IPropertyChangeListener)
 	 */
 	public void removePropertyChangeListener(IPropertyChangeListener listener) {
 		propertyChangeListeners.remove(listener);
 	}
 	/**
 	 * Implements IWorkingSetManager.
 	 *
 	 * @see org.eclipse.ui.IWorkingSetManager#removeWorkingSet(IWorkingSet)
 	 */
 	public void removeWorkingSet(IWorkingSet workingSet) {
 		workingSets.remove(workingSet);
 		recentWorkingSets.remove(workingSet);
 		saveState();
 		firePropertyChange(CHANGE_WORKING_SET_REMOVE, workingSet, null);
 	}
 	/**
 	 * Restores the list of most recently used working sets from the
 	 * persistence store.
 	 *
 	 * @param memento the persistence store
 	 */
 	private void restoreMruList(IMemento memento) {
 		IMemento[] mruWorkingSets = memento.getChildren(IWorkbenchConstants.TAG_MRU_LIST);

 		for (int i = mruWorkingSets.length - 1; i >= 0; i--) {
 			String workingSetName = mruWorkingSets[i].getString(IWorkbenchConstants.TAG_NAME);
 			if (workingSetName != null) {
 				IWorkingSet workingSet = getWorkingSet(workingSetName);
 				if (workingSet != null) {
 					addRecentWorkingSet(workingSet);
 				}
 			}
 		}
 	}
 	/**
 	 * Reads the persistence store and creates the working sets
 	 * stored in it.
 	 */
 	public void restoreState() {
 		File stateFile = getWorkingSetStateFile();

 		if (stateFile.exists()) {
 			try {
 				FileInputStream input = new FileInputStream(stateFile);
 				InputStreamReader reader = new InputStreamReader(input, "utf-8"); //$NON-NLS-1$

 				IMemento memento = XMLMemento.createReadRoot(reader);
 				restoreWorkingSetState(memento);
 				restoreMruList(memento);
 				reader.close();
 			} catch (IOException e) {
 				MessageDialog.openError(
 					(Shell) null,
 					WorkbenchMessages.getString("ProblemRestoringWorkingSetState.title"), //$NON-NLS-1$
 					WorkbenchMessages.getString("ProblemRestoringWorkingSetState.message")); //$NON-NLS-1$
 			} catch (WorkbenchException e) {
 				ErrorDialog.openError(
 					(Shell) null,
 					WorkbenchMessages.getString("ProblemRestoringWorkingSetState.title"),//$NON-NLS-1$
 					WorkbenchMessages.getString("ProblemRestoringWorkingSetState.message"), //$NON-NLS-1$
 					e.getStatus());
 			}
 		}
 	}
 	/**
 	 * Recreates a working set from the persistence store.
 	 *
 	 * @param memento the persistence store
 	 * @return the working set created from the memento or null if
 	 * 	creation failed.
 	 */
 	private IWorkingSet restoreWorkingSet(IMemento memento) {
 		String factoryID = memento.getString(IWorkbenchConstants.TAG_FACTORY_ID);

 		if (factoryID == null) {
 			WorkbenchPlugin.log("Unable to restore working set - no factory ID."); //$NON-NLS-1$
 			return null;
 		}
 		IElementFactory factory = WorkbenchPlugin.getDefault().getElementFactory(factoryID);
 		if (factory == null) {
 			WorkbenchPlugin.log("Unable to restore working set - cannot instantiate factory: " + factoryID); //$NON-NLS-1$
 			return null;
 		}
 		IAdaptable adaptable = factory.createElement(memento);
 		if (adaptable == null) {
 			WorkbenchPlugin.log("Unable to restore working set - cannot instantiate working set: " + factoryID); //$NON-NLS-1$
 			return null;
 		}
 		if ((adaptable instanceof IWorkingSet) == false) {
 			WorkbenchPlugin.log("Unable to restore working set - element is not an IWorkingSet: " + factoryID); //$NON-NLS-1$
 			return null;
 		}
 		return (IWorkingSet) adaptable;
 	}
 	/**
 	 * Recreates all working sets from the persistence store
 	 * and adds them to the receiver.
 	 *
 	 * @param memento the persistence store
 	 */
 	private void restoreWorkingSetState(IMemento memento) {
 		IMemento[] workingSets = memento.getChildren(IWorkbenchConstants.TAG_WORKING_SET);

 		for (int i = 0; i < workingSets.length; i++) {
 			IWorkingSet workingSet = restoreWorkingSet(workingSets[i]);
 			if (workingSet != null) {
 				addWorkingSet(workingSet);
 			}
 		}
 	}
 	/**
 	 * Saves the working sets in the persistence store
 	 */
 	private void saveState() {
 		XMLMemento memento = XMLMemento.createWriteRoot(IWorkbenchConstants.TAG_WORKING_SET_MANAGER);
 		File stateFile = getWorkingSetStateFile();

 		saveWorkingSetState(memento);
 		saveMruList(memento);
 		try {
 			FileOutputStream stream = new FileOutputStream(stateFile);
 			OutputStreamWriter writer = new OutputStreamWriter(stream, "utf-8"); //$NON-NLS-1$
 			memento.save(writer);
 			writer.close();
 		} catch (IOException e) {
 			stateFile.delete();
 			MessageDialog.openError((Shell) null, WorkbenchMessages.getString("ProblemSavingWorkingSetState.title"), //$NON-NLS-1$
 			WorkbenchMessages.getString("ProblemSavingWorkingSetState.message")); //$NON-NLS-1$
 		}
 	}
 	/**
 	 * Saves the list of most recently used working sets in the persistence
 	 * store.
 	 *
 	 * @param memento the persistence store
 	 */
 	private void saveMruList(IMemento memento) {
 		Iterator iterator = recentWorkingSets.iterator();

 		while (iterator.hasNext()) {
 			IWorkingSet workingSet = (IWorkingSet) iterator.next();
 			IMemento mruMemento = memento.createChild(IWorkbenchConstants.TAG_MRU_LIST);

 			mruMemento.putString(IWorkbenchConstants.TAG_NAME, workingSet.getName());
 		}
 	}
 	/**
 	 * Saves all persistable working sets in the persistence store.
 	 *
 	 * @param memento the persistence store
 	 * @see IPersistableElement
 	 */
 	private void saveWorkingSetState(IMemento memento) {
 		Iterator iterator = workingSets.iterator();

 		while (iterator.hasNext()) {
 			IWorkingSet workingSet = (IWorkingSet) iterator.next();
 			IPersistableElement persistable = null;

 			if (workingSet instanceof IPersistableElement) {
 				persistable = (IPersistableElement) workingSet;
 			} else if (workingSet instanceof IAdaptable) {
 				persistable = (IPersistableElement) ((IAdaptable) workingSet).getAdapter(IPersistableElement.class);
 			}
 			if (persistable != null) {
 				IMemento workingSetMemento = memento.createChild(IWorkbenchConstants.TAG_WORKING_SET);
 				workingSetMemento.putString(IWorkbenchConstants.TAG_FACTORY_ID, persistable.getFactoryId());
 				persistable.saveState(workingSetMemento);
 			}
 		}
 	}
 	/**
 	 * Persists all working sets and fires a property change event for
 	 * the changed working set.
 	 * Should only be called by org.eclipse.ui.internal.WorkingSet.
 	 *
 	 * @param changedWorkingSet the working set that has changed
 	 * @param propertyChangeId the changed property. one of
 	 * 	CHANGE_WORKING_SET_CONTENT_CHANGE and CHANGE_WORKING_SET_NAME_CHANGE
 	 */
 	public void workingSetChanged(IWorkingSet changedWorkingSet, String propertyChangeId) {
 		saveState();
 		firePropertyChange(propertyChangeId, null, changedWorkingSet);
 	}
 }
	package org.eclipse.ui.internal;
	/*
	* (c) Copyright IBM Corp. 2002.
	* All Rights Reserved.
	*/

	import java.io.*;
	import java.util.*;

	import org.eclipse.core.runtime.IAdaptable;
	import org.eclipse.core.runtime.IPath;
	import org.eclipse.jface.dialogs.ErrorDialog;
	import org.eclipse.jface.dialogs.MessageDialog;
	import org.eclipse.jface.util.*;
	import org.eclipse.swt.widgets.Display;
	import org.eclipse.swt.widgets.Shell;
	import org.eclipse.ui.*;
	import org.eclipse.ui.dialogs.*;
	import org.eclipse.ui.internal.dialogs.WorkingSetEditWizard;
	import org.eclipse.ui.internal.dialogs.WorkingSetSelectionDialog;
	import org.eclipse.ui.internal.registry.WorkingSetRegistry;

	/**
	* A working set manager stores working sets and provides property
	* change notification when a working set is added or removed.
	* Working sets are persisted whenever one is added or removed.
	*
	* @see IWorkingSetManager
	* @since 2.0
	*/
	public class WorkingSetManager implements IWorkingSetManager {
	// Working set persistence
	private static final String WORKING_SET_STATE_FILENAME = "workingsets.xml"; //$NON-NLS-1$
	/**
	* Size of the list of most recently used working sets.
	*/
	private static final int MRU_SIZE = 5;

	private SortedSet workingSets = new TreeSet(new WorkingSetComparator());
	private List recentWorkingSets = new ArrayList();
	private ListenerList propertyChangeListeners = new ListenerList();

	/**
	* Implements IWorkingSetManager.
	*
	* @see org.eclipse.ui.IWorkingSetManager#addRecentWorkingSet(IWorkingSet)
	*/
	public void addRecentWorkingSet(IWorkingSet workingSet) {
	recentWorkingSets.remove(workingSet);
	recentWorkingSets.add(0, workingSet);
	if (recentWorkingSets.size() > MRU_SIZE) {
	recentWorkingSets.remove(MRU_SIZE);
	}
	saveState();
	}
	/**
	* Implements IWorkingSetManager.
	*
	* @see org.eclipse.ui.IWorkingSetManager#addWorkingSet(IWorkingSet)
	*/
	public void addWorkingSet(IWorkingSet workingSet) {
	Assert.isTrue(!workingSets.contains(workingSet), "working set already registered"); //$NON-NLS-1$
	workingSets.add(workingSet);
	saveState();
	firePropertyChange(CHANGE_WORKING_SET_ADD, null, workingSet);
	}
	/**
	* Implements IWorkingSetManager.
	*
	* @see org.eclipse.ui.IWorkingSetManager#addPropertyChangeListener(IPropertyChangeListener)
	*/
	public void addPropertyChangeListener(IPropertyChangeListener listener) {
	propertyChangeListeners.add(listener);
	}
	/**
	* Implements IWorkingSetManager.
	*
	* @see org.eclipse.ui.IWorkingSetManager#createWorkingSet(String, IAdaptable[])
	*/
	public IWorkingSet createWorkingSet(String name, IAdaptable[] elements) {
	return new WorkingSet(name, elements);
	}
	/**
	* @see org.eclipse.ui.IWorkingSetManager#createWorkingSetEditWizard(org.eclipse.ui.IWorkingSet)
	* @since 2.1
	*/
	public IWorkingSetEditWizard createWorkingSetEditWizard(IWorkingSet workingSet) {
	String editPageId = ((WorkingSet) workingSet).getEditPageId();
	WorkingSetRegistry registry = WorkbenchPlugin.getDefault().getWorkingSetRegistry();
	IWorkingSetPage editPage = null;

	if (editPageId != null) {
	editPage = registry.getWorkingSetPage(editPageId);
	}
	if (editPage == null) {
	editPage = registry.getDefaultWorkingSetPage();
	if (editPage == null) {
	return null;
	}
	}
	WorkingSetEditWizard editWizard = new WorkingSetEditWizard(editPage);
	editWizard.setSelection(workingSet);
	return editWizard;
	}
	/**
	* @deprecated use createWorkingSetSelectionDialog(parent, true) instead
	*/
	public IWorkingSetSelectionDialog createWorkingSetSelectionDialog(Shell parent) {
	return createWorkingSetSelectionDialog(parent, true);
	}
	/**
	* Implements IWorkingSetManager.
	*
	* @see org.eclipse.ui.IWorkingSetManager#createWorkingSetSelectionDialog(Shell, boolean)
	*/
	public IWorkingSetSelectionDialog createWorkingSetSelectionDialog(Shell parent, boolean multi) {
	return new WorkingSetSelectionDialog(parent, multi);
	}
	/**
	* Tests the receiver and the object for equality
	*
	* @param object object to compare the receiver to
	* @return true=the object equals the receiver, it has the same
	* working sets. false otherwise
	*/
	public boolean equals(Object object) {
	if (this == object) {
	return true;
	}
	if (object instanceof WorkingSetManager) {
	WorkingSetManager workingSetManager = (WorkingSetManager) object;
	return workingSetManager.workingSets.equals(workingSets);
	}
	return false;
	}
	/**
	* Notify property change listeners about a change to the list of
	* working sets.
	*
	* @param changeId one of
	* IWorkingSetManager#CHANGE_WORKING_SET_ADD
	* IWorkingSetManager#CHANGE_WORKING_SET_REMOVE
	* IWorkingSetManager#CHANGE_WORKING_SET_CONTENT_CHANGE
	* IWorkingSetManager#CHANGE_WORKING_SET_NAME_CHANGE
	* @param oldValue the removed working set or null if a working set
	* was added or changed.
	* @param newValue the new or changed working set or null if a working
	* set was removed.
	*/
	private void firePropertyChange(String changeId, Object oldValue, Object newValue) {
	final PropertyChangeEvent event = new PropertyChangeEvent(this, changeId, oldValue, newValue);

	Display.getDefault().syncExec(new Runnable() {
	public void run() {
	Object[] listeners = propertyChangeListeners.getListeners();
	for (int i = 0; i < listeners.length; i++) {
	((IPropertyChangeListener) listeners[i]).propertyChange(event);
	}
	}
	});
	}
	/**
	* Implements IWorkingSetManager.
	*
	* @see org.eclipse.ui.IWorkingSetManager#getRecentWorkingSets()
	*/
	public IWorkingSet[] getRecentWorkingSets() {
	return (IWorkingSet[]) recentWorkingSets.toArray(new IWorkingSet[recentWorkingSets.size()]);
	}
	/**
	* Implements IWorkingSetManager.
	*
	* @see org.eclipse.ui.IWorkingSetManager#getWorkingSet(String)
	*/
	public IWorkingSet getWorkingSet(String name) {
	if (name == null \|\| workingSets == null)
	return null;

	Iterator iter = workingSets.iterator();
	while (iter.hasNext()) {
	IWorkingSet workingSet = (IWorkingSet) iter.next();
	if (name.equals(workingSet.getName()))
	return workingSet;
	}
	return null;
	}
	/**
	* Returns the hash code.
	*
	* @return the hash code.
	*/
	public int hashCode() {
	return workingSets.hashCode();
	}
	/**
	* Implements IWorkingSetManager.
	*
	* @see org.eclipse.ui.IWorkingSetManager#getWorkingSets()
	*/
	public IWorkingSet[] getWorkingSets() {
	return (IWorkingSet[]) workingSets.toArray(new IWorkingSet[workingSets.size()]);
	}
	/**
	* Returns the file used as the persistence store
	*
	* @return the file used as the persistence store
	*/
	private File getWorkingSetStateFile() {
	IPath path = WorkbenchPlugin.getDefault().getStateLocation();
	path = path.append(WORKING_SET_STATE_FILENAME);
	return path.toFile();
	}
	/**
	* Implements IWorkingSetManager.
	*
	* @see org.eclipse.ui.IWorkingSetManager#removePropertyChangeListener(IPropertyChangeListener)
	*/
	public void removePropertyChangeListener(IPropertyChangeListener listener) {
	propertyChangeListeners.remove(listener);
	}
	/**
	* Implements IWorkingSetManager.
	*
	* @see org.eclipse.ui.IWorkingSetManager#removeWorkingSet(IWorkingSet)
	*/
	public void removeWorkingSet(IWorkingSet workingSet) {
	workingSets.remove(workingSet);
	recentWorkingSets.remove(workingSet);
	saveState();
	firePropertyChange(CHANGE_WORKING_SET_REMOVE, workingSet, null);
	}
	/**
	* Restores the list of most recently used working sets from the
	* persistence store.
	*
	* @param memento the persistence store
	*/
	private void restoreMruList(IMemento memento) {
	IMemento[] mruWorkingSets = memento.getChildren(IWorkbenchConstants.TAG_MRU_LIST);

	for (int i = mruWorkingSets.length - 1; i >= 0; i--) {
	String workingSetName = mruWorkingSets[i].getString(IWorkbenchConstants.TAG_NAME);
	if (workingSetName != null) {
	IWorkingSet workingSet = getWorkingSet(workingSetName);
	if (workingSet != null) {
	addRecentWorkingSet(workingSet);
	}
	}
	}
	}
	/**
	* Reads the persistence store and creates the working sets
	* stored in it.
	*/
	public void restoreState() {
	File stateFile = getWorkingSetStateFile();

	if (stateFile.exists()) {
	try {
	FileInputStream input = new FileInputStream(stateFile);
	InputStreamReader reader = new InputStreamReader(input, "utf-8"); //$NON-NLS-1$

	IMemento memento = XMLMemento.createReadRoot(reader);
	restoreWorkingSetState(memento);
	restoreMruList(memento);
	reader.close();
	} catch (IOException e) {
	MessageDialog.openError(
	(Shell) null,
	WorkbenchMessages.getString("ProblemRestoringWorkingSetState.title"), //$NON-NLS-1$
	WorkbenchMessages.getString("ProblemRestoringWorkingSetState.message")); //$NON-NLS-1$
	} catch (WorkbenchException e) {
	ErrorDialog.openError(
	(Shell) null,
	WorkbenchMessages.getString("ProblemRestoringWorkingSetState.title"),//$NON-NLS-1$
	WorkbenchMessages.getString("ProblemRestoringWorkingSetState.message"), //$NON-NLS-1$
	e.getStatus());
	}
	}
	}
	/**
	* Recreates a working set from the persistence store.
	*
	* @param memento the persistence store
	* @return the working set created from the memento or null if
	* creation failed.
	*/
	private IWorkingSet restoreWorkingSet(IMemento memento) {
	String factoryID = memento.getString(IWorkbenchConstants.TAG_FACTORY_ID);

	if (factoryID == null) {
	WorkbenchPlugin.log("Unable to restore working set - no factory ID."); //$NON-NLS-1$
	return null;
	}
	IElementFactory factory = WorkbenchPlugin.getDefault().getElementFactory(factoryID);
	if (factory == null) {
	WorkbenchPlugin.log("Unable to restore working set - cannot instantiate factory: " + factoryID); //$NON-NLS-1$
	return null;
	}
	IAdaptable adaptable = factory.createElement(memento);
	if (adaptable == null) {
	WorkbenchPlugin.log("Unable to restore working set - cannot instantiate working set: " + factoryID); //$NON-NLS-1$
	return null;
	}
	if ((adaptable instanceof IWorkingSet) == false) {
	WorkbenchPlugin.log("Unable to restore working set - element is not an IWorkingSet: " + factoryID); //$NON-NLS-1$
	return null;
	}
	return (IWorkingSet) adaptable;
	}
	/**
	* Recreates all working sets from the persistence store
	* and adds them to the receiver.
	*
	* @param memento the persistence store
	*/
	private void restoreWorkingSetState(IMemento memento) {
	IMemento[] workingSets = memento.getChildren(IWorkbenchConstants.TAG_WORKING_SET);

	for (int i = 0; i < workingSets.length; i++) {
	IWorkingSet workingSet = restoreWorkingSet(workingSets[i]);
	if (workingSet != null) {
	addWorkingSet(workingSet);
	}
	}
	}
	/**
	* Saves the working sets in the persistence store
	*/
	private void saveState() {
	XMLMemento memento = XMLMemento.createWriteRoot(IWorkbenchConstants.TAG_WORKING_SET_MANAGER);
	File stateFile = getWorkingSetStateFile();

	saveWorkingSetState(memento);
	saveMruList(memento);
	try {
	FileOutputStream stream = new FileOutputStream(stateFile);
	OutputStreamWriter writer = new OutputStreamWriter(stream, "utf-8"); //$NON-NLS-1$
	memento.save(writer);
	writer.close();
	} catch (IOException e) {
	stateFile.delete();
	MessageDialog.openError((Shell) null, WorkbenchMessages.getString("ProblemSavingWorkingSetState.title"), //$NON-NLS-1$
	WorkbenchMessages.getString("ProblemSavingWorkingSetState.message")); //$NON-NLS-1$
	}
	}
	/**
	* Saves the list of most recently used working sets in the persistence
	* store.
	*
	* @param memento the persistence store
	*/
	private void saveMruList(IMemento memento) {
	Iterator iterator = recentWorkingSets.iterator();

	while (iterator.hasNext()) {
	IWorkingSet workingSet = (IWorkingSet) iterator.next();
	IMemento mruMemento = memento.createChild(IWorkbenchConstants.TAG_MRU_LIST);

	mruMemento.putString(IWorkbenchConstants.TAG_NAME, workingSet.getName());
	}
	}
	/**
	* Saves all persistable working sets in the persistence store.
	*
	* @param memento the persistence store
	* @see IPersistableElement
	*/
	private void saveWorkingSetState(IMemento memento) {
	Iterator iterator = workingSets.iterator();

	while (iterator.hasNext()) {
	IWorkingSet workingSet = (IWorkingSet) iterator.next();
	IPersistableElement persistable = null;

	if (workingSet instanceof IPersistableElement) {
	persistable = (IPersistableElement) workingSet;
	} else if (workingSet instanceof IAdaptable) {
	persistable = (IPersistableElement) ((IAdaptable) workingSet).getAdapter(IPersistableElement.class);
	}
	if (persistable != null) {
	IMemento workingSetMemento = memento.createChild(IWorkbenchConstants.TAG_WORKING_SET);
	workingSetMemento.putString(IWorkbenchConstants.TAG_FACTORY_ID, persistable.getFactoryId());
	persistable.saveState(workingSetMemento);
	}
	}
	}
	/**
	* Persists all working sets and fires a property change event for
	* the changed working set.
	* Should only be called by org.eclipse.ui.internal.WorkingSet.
	*
	* @param changedWorkingSet the working set that has changed
	* @param propertyChangeId the changed property. one of
	* CHANGE_WORKING_SET_CONTENT_CHANGE and CHANGE_WORKING_SET_NAME_CHANGE
	*/
	public void workingSetChanged(IWorkingSet changedWorkingSet, String propertyChangeId) {
	saveState();
	firePropertyChange(propertyChangeId, null, changedWorkingSet);
	}
	}