bundles/org.eclipse.emf.emfstore.client.ui.rcp/src/org/eclipse/emf/emfstore/internal/client/ui/dialogs/login/LoginDialog.java - emf-store/org.eclipse.emf.emfstore.core - Git at Google

 /*******************************************************************************
  * Copyright (c) 2012-2015 EclipseSource Muenchen GmbH 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:
  * Otto von Wesendonk, Edgar Mueller - initial API and implementation
  ******************************************************************************/
 package org.eclipse.emf.emfstore.internal.client.ui.dialogs.login;

 import java.util.List;
 import java.util.concurrent.Callable;

 import org.apache.commons.lang.StringUtils;
 import org.eclipse.emf.emfstore.client.ESUsersession;
 import org.eclipse.emf.emfstore.client.util.RunESCommand;
 import org.eclipse.emf.emfstore.internal.client.model.ModelFactory;
 import org.eclipse.emf.emfstore.internal.client.model.Usersession;
 import org.eclipse.emf.emfstore.internal.client.model.impl.api.ESServerImpl;
 import org.eclipse.emf.emfstore.internal.client.model.impl.api.ESUsersessionImpl;
 import org.eclipse.emf.emfstore.internal.client.ui.dialogs.AbstractLoginDialog;
 import org.eclipse.emf.emfstore.internal.common.APIUtil;
 import org.eclipse.jface.dialogs.IDialogConstants;
 import org.eclipse.jface.viewers.ArrayContentProvider;
 import org.eclipse.jface.viewers.ComboViewer;
 import org.eclipse.jface.viewers.ISelection;
 import org.eclipse.jface.viewers.ISelectionChangedListener;
 import org.eclipse.jface.viewers.LabelProvider;
 import org.eclipse.jface.viewers.SelectionChangedEvent;
 import org.eclipse.jface.viewers.StructuredSelection;
 import org.eclipse.swt.SWT;
 import org.eclipse.swt.events.ModifyEvent;
 import org.eclipse.swt.events.ModifyListener;
 import org.eclipse.swt.graphics.Point;
 import org.eclipse.swt.layout.GridData;
 import org.eclipse.swt.layout.GridLayout;
 import org.eclipse.swt.widgets.Button;
 import org.eclipse.swt.widgets.Combo;
 import org.eclipse.swt.widgets.Composite;
 import org.eclipse.swt.widgets.Control;
 import org.eclipse.swt.widgets.Label;
 import org.eclipse.swt.widgets.Shell;
 import org.eclipse.swt.widgets.Text;
 import org.eclipse.wb.swt.ResourceManager;

 /**
  * RCP version of the login dialog.
  *
  * @author ovonwesen
  * @author emueller
  *
  * @see LoginDialogController
  */
 public class LoginDialog extends AbstractLoginDialog {

 	private static final String CLIENT_UI_BUNDLE = "org.eclipse.emf.emfstore.client.ui.rcp"; //$NON-NLS-1$
 	private static final String LOGIN_ICON = "icons/login_icon.png"; //$NON-NLS-1$
 	private Text passwordField;
 	private Button savePassword;
 	private ComboViewer usernameCombo;

 	private List<Usersession> knownUsersessions;

 	/**
 	 * Create the dialog.
 	 *
 	 * @param parentShell
 	 *            the parent shell to be used by the dialog
 	 * @param controller
 	 *            the login dialog controller responsible for opening up the
 	 *            login dialog
 	 *
 	 */
 	public LoginDialog(Shell parentShell, ILoginDialogController controller) {
 		super(parentShell, controller);
 	}

 	/**
 	 *
 	 * {@inheritDoc}
 	 *
 	 * @see org.eclipse.jface.dialogs.TitleAreaDialog#createDialogArea(org.eclipse.swt.widgets.Composite)
 	 */
 	@Override
 	protected Control createDialogArea(Composite parent) {
 		setTitleImage(ResourceManager.getPluginImage(CLIENT_UI_BUNDLE, LOGIN_ICON));
 		setTitle(Messages.LoginDialog_Login_To + getController().getServer().getName());
 		setMessage(Messages.LoginDialog_Enter_Name_And_Password);
 		getShell().setText(Messages.LoginDialog_Auth_Required);
 		final Composite area = (Composite) super.createDialogArea(parent);
 		final Composite container = new Composite(area, SWT.NONE);
 		container.setLayout(new GridLayout(1, false));
 		container.setLayoutData(new GridData(GridData.FILL_BOTH));

 		final Composite loginContainer = new Composite(container, SWT.NONE);
 		loginContainer.setLayout(new GridLayout(3, false));
 		loginContainer.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true,
 			true, 1, 1));
 		loginContainer.setBounds(0, 0, 64, 64);

 		createUsernameLabel(loginContainer);
 		createUsernameCombo(loginContainer);
 		createPasswordLabel(loginContainer);
 		createPasswordField(loginContainer);
 		createSavePasswordLabel(loginContainer);
 		createSavePassword(loginContainer);

 		initData();
 		if (getController().getUsersession() == null) {
 			final ESUsersession lastUsersession = getController().getServer().getLastUsersession();
 			if (lastUsersession != null) {
 				loadUsersession(((ESUsersessionImpl) lastUsersession).toInternalAPI());
 			} else {
 				loadUsersession(null);
 			}
 		} else {
 			final ESUsersession usersession = getController().getUsersession();
 			loadUsersession(((ESUsersessionImpl) usersession).toInternalAPI());
 		}
 		return area;
 	}

 	private void createSavePassword(Composite parent) {
 		savePassword = new Button(parent, SWT.CHECK);
 		new Label(parent, SWT.NONE);
 	}

 	private void createSavePasswordLabel(Composite parent) {
 		final Label savePasswordLabel = new Label(parent, SWT.NONE);
 		savePasswordLabel.setText(Messages.LoginDialog_Save_Password);
 	}

 	private void createPasswordField(Composite parent) {
 		passwordField = new Text(parent, SWT.BORDER | SWT.PASSWORD);
 		final GridData gridData = new GridData(SWT.LEFT, SWT.CENTER, false, false, 1, 1);
 		gridData.widthHint = 250;
 		passwordField.setLayoutData(gridData);
 		passwordField.addModifyListener(new ModifyListener() {
 			public void modifyText(ModifyEvent e) {
 				setPasswordModified(true);
 				flushErrorMessage();
 			}
 		});
 		new Label(parent, SWT.NONE);
 	}

 	private void createPasswordLabel(Composite parent) {
 		final Label passwordLabel = new Label(parent, SWT.NONE);
 		final GridData gridData = new GridData(SWT.LEFT, SWT.CENTER, false, false, 1, 1);
 		gridData.widthHint = 80;
 		passwordLabel.setLayoutData(gridData);
 		passwordLabel.setText(Messages.LoginDialog_Password);
 	}

 	private void createUsernameLabel(Composite parent) {

 		final Label usernameLabel = new Label(parent, SWT.NONE);
 		final GridData gridData = new GridData(SWT.RIGHT, SWT.CENTER, false, false,
 			1, 1);
 		gridData.widthHint = 95;
 		usernameLabel.setLayoutData(gridData);
 		usernameLabel.setText(Messages.LoginDialog_Username);
 	}

 	private void createUsernameCombo(Composite parent) {
 		usernameCombo = new ComboViewer(parent, SWT.NONE);
 		final ComboListener comboListener = new ComboListener();
 		usernameCombo.addPostSelectionChangedListener(comboListener);
 		final Combo combo = usernameCombo.getCombo();
 		combo.addModifyListener(comboListener);
 		final GridData gridData = new GridData(SWT.LEFT, SWT.CENTER, false, false, 1, 1);
 		gridData.widthHint = 235;
 		combo.setLayoutData(gridData);
 		new Label(parent, SWT.NONE);
 	}

 	private void initData() {
 		usernameCombo.setContentProvider(ArrayContentProvider.getInstance());
 		usernameCombo.setLabelProvider(new LabelProvider() {
 			@Override
 			public String getText(Object element) {
 				if (element instanceof Usersession
 					&& ((Usersession) element).getUsername() != null) {
 					return ((Usersession) element).getUsername();
 				}
 				return super.getText(element);
 			}
 		});

 		knownUsersessions = APIUtil.mapToInternalAPI(Usersession.class, getController().getKnownUsersessions());
 		usernameCombo.setInput(knownUsersessions);
 	}

 	/**
 	 * Fills the login dialog data according to the given {@link Usersession}.
 	 *
 	 * @param usersession
 	 *            the user session to be loaded
 	 */
 	private void loadUsersession(Usersession usersession) {
 		if (usersession != null && getSelectedUsersession() == usersession) {
 			return;
 		}

 		setSelectedSession(usersession);

 		// reset fields
 		passwordField.setMessage(StringUtils.EMPTY);
 		savePassword.setSelection(false);

 		if (getSelectedUsersession() != null) {

 			// check whether text is set correctly
 			if (!usernameCombo.getCombo().getText()
 				.equals(getSelectedUsersession().getUsername())) {
 				usernameCombo.getCombo().setText(
 					getSelectedUsersession().getUsername());
 			}

 			if (getSelectedUsersession().isSavePassword()
 				&& getSelectedUsersession().getPassword() != null) {
 				passwordField
 					.setMessage(Messages.LoginDialog_Password_Saved_Reenter_To_Change);
 				passwordField.setText(StringUtils.EMPTY);
 				savePassword.setSelection(true);
 			}
 			// reset password modified. modified password is only relevant when
 			// dealing with saved passwords.
 			setPasswordModified(false);
 		}
 	}

 	/**
 	 *
 	 * {@inheritDoc}
 	 *
 	 * @see org.eclipse.jface.dialogs.Dialog#okPressed()
 	 */
 	@Override
 	protected void okPressed() {
 		final String username = usernameCombo.getCombo().getText();

 		Usersession candidateSession = getSelectedUsersession();
 		final ESServerImpl server = (ESServerImpl) getController().getServer();

 		// try to find usersession with same username in order to avoid
 		// duplicates
 		if (candidateSession == null) {
 			candidateSession = getUsersessionIfKnown(username);
 		}

 		if (candidateSession == null
 			|| !candidateSession.getServerInfo().equals(server.toInternalAPI())) {
 			final ESServerImpl serverImpl = (ESServerImpl) getController().getServer();
 			candidateSession = ModelFactory.eINSTANCE.createUsersession();
 			final Usersession session = candidateSession;
 			setSelectedSession(candidateSession);

 			RunESCommand.run(new Callable<Void>() {
 				public Void call() throws Exception {
 					session.setServerInfo(serverImpl.toInternalAPI());
 					session.setUsername(username);
 					return null;
 				}
 			});
 		}

 		setPassword(passwordField.getText());
 		setPasswordSaved(savePassword.getSelection());

 		super.okPressed();
 	}

 	private Usersession getUsersessionIfKnown(String username) {

 		if (getSelectedUsersession() != null && getSelectedUsersession().getUsername().equals(username)) {
 			return getSelectedUsersession();
 		}

 		for (final Usersession session : knownUsersessions) {
 			if (session.getUsername().equals(username)) {
 				return session;
 			}
 		}
 		return null;
 	}

 	/**
 	 *
 	 * {@inheritDoc}
 	 *
 	 * @see org.eclipse.jface.dialogs.Dialog#createButtonsForButtonBar(org.eclipse.swt.widgets.Composite)
 	 */
 	@Override
 	protected void createButtonsForButtonBar(Composite parent) {
 		createButton(parent,
 			IDialogConstants.OK_ID,
 			Messages.LoginDialog_Ok,
 			true);
 		createButton(parent,
 			IDialogConstants.CANCEL_ID,
 			Messages.LoginDialog_Cancel,
 			false);
 	}

 	/**
 	 *
 	 * {@inheritDoc}
 	 *
 	 * @see org.eclipse.jface.dialogs.TitleAreaDialog#getInitialSize()
 	 */
 	@Override
 	protected Point getInitialSize() {
 		return new Point(400, 250);
 	}

 	/**
 	 * Clears the error message.
 	 */
 	private void flushErrorMessage() {
 		setErrorMessage(null);
 	}

 	/**
 	 * Simple listener for loading the selected usersession if the user changes
 	 * the selected entry within the combo box that contains all known
 	 * usersessions.
 	 *
 	 * @author ovonwesen
 	 *
 	 */
 	private final class ComboListener implements ISelectionChangedListener,
 		ModifyListener {
 		private String lastText = StringUtils.EMPTY;

 		public void selectionChanged(SelectionChangedEvent event) {
 			final ISelection selection = event.getSelection();
 			if (selection instanceof StructuredSelection) {
 				final Object firstElement = ((StructuredSelection) selection)
 					.getFirstElement();
 				if (firstElement instanceof Usersession) {
 					loadUsersession((Usersession) firstElement);
 				}
 			}
 		}

 		public void modifyText(ModifyEvent e) {
 			final String text = usernameCombo.getCombo().getText();
 			if (StringUtils.isNotBlank(text) && !text.equals(lastText)) {
 				loadUsersession(getUsersessionIfKnown(text));
 				lastText = text;
 			}
 			flushErrorMessage();
 		}
 	}

 }
	/*******************************************************************************
	* Copyright (c) 2012-2015 EclipseSource Muenchen GmbH 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:
	* Otto von Wesendonk, Edgar Mueller - initial API and implementation
	******************************************************************************/
	package org.eclipse.emf.emfstore.internal.client.ui.dialogs.login;

	import java.util.List;
	import java.util.concurrent.Callable;

	import org.apache.commons.lang.StringUtils;
	import org.eclipse.emf.emfstore.client.ESUsersession;
	import org.eclipse.emf.emfstore.client.util.RunESCommand;
	import org.eclipse.emf.emfstore.internal.client.model.ModelFactory;
	import org.eclipse.emf.emfstore.internal.client.model.Usersession;
	import org.eclipse.emf.emfstore.internal.client.model.impl.api.ESServerImpl;
	import org.eclipse.emf.emfstore.internal.client.model.impl.api.ESUsersessionImpl;
	import org.eclipse.emf.emfstore.internal.client.ui.dialogs.AbstractLoginDialog;
	import org.eclipse.emf.emfstore.internal.common.APIUtil;
	import org.eclipse.jface.dialogs.IDialogConstants;
	import org.eclipse.jface.viewers.ArrayContentProvider;
	import org.eclipse.jface.viewers.ComboViewer;
	import org.eclipse.jface.viewers.ISelection;
	import org.eclipse.jface.viewers.ISelectionChangedListener;
	import org.eclipse.jface.viewers.LabelProvider;
	import org.eclipse.jface.viewers.SelectionChangedEvent;
	import org.eclipse.jface.viewers.StructuredSelection;
	import org.eclipse.swt.SWT;
	import org.eclipse.swt.events.ModifyEvent;
	import org.eclipse.swt.events.ModifyListener;
	import org.eclipse.swt.graphics.Point;
	import org.eclipse.swt.layout.GridData;
	import org.eclipse.swt.layout.GridLayout;
	import org.eclipse.swt.widgets.Button;
	import org.eclipse.swt.widgets.Combo;
	import org.eclipse.swt.widgets.Composite;
	import org.eclipse.swt.widgets.Control;
	import org.eclipse.swt.widgets.Label;
	import org.eclipse.swt.widgets.Shell;
	import org.eclipse.swt.widgets.Text;
	import org.eclipse.wb.swt.ResourceManager;

	/**
	* RCP version of the login dialog.
	*
	* @author ovonwesen
	* @author emueller
	*
	* @see LoginDialogController
	*/
	public class LoginDialog extends AbstractLoginDialog {

	private static final String CLIENT_UI_BUNDLE = "org.eclipse.emf.emfstore.client.ui.rcp"; //$NON-NLS-1$
	private static final String LOGIN_ICON = "icons/login_icon.png"; //$NON-NLS-1$
	private Text passwordField;
	private Button savePassword;
	private ComboViewer usernameCombo;

	private List<Usersession> knownUsersessions;

	/**
	* Create the dialog.
	*
	* @param parentShell
	* the parent shell to be used by the dialog
	* @param controller
	* the login dialog controller responsible for opening up the
	* login dialog
	*
	*/
	public LoginDialog(Shell parentShell, ILoginDialogController controller) {
	super(parentShell, controller);
	}

	/**
	*
	* {@inheritDoc}
	*
	* @see org.eclipse.jface.dialogs.TitleAreaDialog#createDialogArea(org.eclipse.swt.widgets.Composite)
	*/
	@Override
	protected Control createDialogArea(Composite parent) {
	setTitleImage(ResourceManager.getPluginImage(CLIENT_UI_BUNDLE, LOGIN_ICON));
	setTitle(Messages.LoginDialog_Login_To + getController().getServer().getName());
	setMessage(Messages.LoginDialog_Enter_Name_And_Password);
	getShell().setText(Messages.LoginDialog_Auth_Required);
	final Composite area = (Composite) super.createDialogArea(parent);
	final Composite container = new Composite(area, SWT.NONE);
	container.setLayout(new GridLayout(1, false));
	container.setLayoutData(new GridData(GridData.FILL_BOTH));

	final Composite loginContainer = new Composite(container, SWT.NONE);
	loginContainer.setLayout(new GridLayout(3, false));
	loginContainer.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true,
	true, 1, 1));
	loginContainer.setBounds(0, 0, 64, 64);

	createUsernameLabel(loginContainer);
	createUsernameCombo(loginContainer);
	createPasswordLabel(loginContainer);
	createPasswordField(loginContainer);
	createSavePasswordLabel(loginContainer);
	createSavePassword(loginContainer);

	initData();
	if (getController().getUsersession() == null) {
	final ESUsersession lastUsersession = getController().getServer().getLastUsersession();
	if (lastUsersession != null) {
	loadUsersession(((ESUsersessionImpl) lastUsersession).toInternalAPI());
	} else {
	loadUsersession(null);
	}
	} else {
	final ESUsersession usersession = getController().getUsersession();
	loadUsersession(((ESUsersessionImpl) usersession).toInternalAPI());
	}
	return area;
	}

	private void createSavePassword(Composite parent) {
	savePassword = new Button(parent, SWT.CHECK);
	new Label(parent, SWT.NONE);
	}

	private void createSavePasswordLabel(Composite parent) {
	final Label savePasswordLabel = new Label(parent, SWT.NONE);
	savePasswordLabel.setText(Messages.LoginDialog_Save_Password);
	}

	private void createPasswordField(Composite parent) {
	passwordField = new Text(parent, SWT.BORDER \| SWT.PASSWORD);
	final GridData gridData = new GridData(SWT.LEFT, SWT.CENTER, false, false, 1, 1);
	gridData.widthHint = 250;
	passwordField.setLayoutData(gridData);
	passwordField.addModifyListener(new ModifyListener() {
	public void modifyText(ModifyEvent e) {
	setPasswordModified(true);
	flushErrorMessage();
	}
	});
	new Label(parent, SWT.NONE);
	}

	private void createPasswordLabel(Composite parent) {
	final Label passwordLabel = new Label(parent, SWT.NONE);
	final GridData gridData = new GridData(SWT.LEFT, SWT.CENTER, false, false, 1, 1);
	gridData.widthHint = 80;
	passwordLabel.setLayoutData(gridData);
	passwordLabel.setText(Messages.LoginDialog_Password);
	}

	private void createUsernameLabel(Composite parent) {

	final Label usernameLabel = new Label(parent, SWT.NONE);
	final GridData gridData = new GridData(SWT.RIGHT, SWT.CENTER, false, false,
	1, 1);
	gridData.widthHint = 95;
	usernameLabel.setLayoutData(gridData);
	usernameLabel.setText(Messages.LoginDialog_Username);
	}

	private void createUsernameCombo(Composite parent) {
	usernameCombo = new ComboViewer(parent, SWT.NONE);
	final ComboListener comboListener = new ComboListener();
	usernameCombo.addPostSelectionChangedListener(comboListener);
	final Combo combo = usernameCombo.getCombo();
	combo.addModifyListener(comboListener);
	final GridData gridData = new GridData(SWT.LEFT, SWT.CENTER, false, false, 1, 1);
	gridData.widthHint = 235;
	combo.setLayoutData(gridData);
	new Label(parent, SWT.NONE);
	}

	private void initData() {
	usernameCombo.setContentProvider(ArrayContentProvider.getInstance());
	usernameCombo.setLabelProvider(new LabelProvider() {
	@Override
	public String getText(Object element) {
	if (element instanceof Usersession
	&& ((Usersession) element).getUsername() != null) {
	return ((Usersession) element).getUsername();
	}
	return super.getText(element);
	}
	});

	knownUsersessions = APIUtil.mapToInternalAPI(Usersession.class, getController().getKnownUsersessions());
	usernameCombo.setInput(knownUsersessions);
	}

	/**
	* Fills the login dialog data according to the given {@link Usersession}.
	*
	* @param usersession
	* the user session to be loaded
	*/
	private void loadUsersession(Usersession usersession) {
	if (usersession != null && getSelectedUsersession() == usersession) {
	return;
	}

	setSelectedSession(usersession);

	// reset fields
	passwordField.setMessage(StringUtils.EMPTY);
	savePassword.setSelection(false);

	if (getSelectedUsersession() != null) {

	// check whether text is set correctly
	if (!usernameCombo.getCombo().getText()
	.equals(getSelectedUsersession().getUsername())) {
	usernameCombo.getCombo().setText(
	getSelectedUsersession().getUsername());
	}

	if (getSelectedUsersession().isSavePassword()
	&& getSelectedUsersession().getPassword() != null) {
	passwordField
	.setMessage(Messages.LoginDialog_Password_Saved_Reenter_To_Change);
	passwordField.setText(StringUtils.EMPTY);
	savePassword.setSelection(true);
	}
	// reset password modified. modified password is only relevant when
	// dealing with saved passwords.
	setPasswordModified(false);
	}
	}

	/**
	*
	* {@inheritDoc}
	*
	* @see org.eclipse.jface.dialogs.Dialog#okPressed()
	*/
	@Override
	protected void okPressed() {
	final String username = usernameCombo.getCombo().getText();

	Usersession candidateSession = getSelectedUsersession();
	final ESServerImpl server = (ESServerImpl) getController().getServer();

	// try to find usersession with same username in order to avoid
	// duplicates
	if (candidateSession == null) {
	candidateSession = getUsersessionIfKnown(username);
	}

	if (candidateSession == null
	\|\| !candidateSession.getServerInfo().equals(server.toInternalAPI())) {
	final ESServerImpl serverImpl = (ESServerImpl) getController().getServer();
	candidateSession = ModelFactory.eINSTANCE.createUsersession();
	final Usersession session = candidateSession;
	setSelectedSession(candidateSession);

	RunESCommand.run(new Callable<Void>() {
	public Void call() throws Exception {
	session.setServerInfo(serverImpl.toInternalAPI());
	session.setUsername(username);
	return null;
	}
	});
	}

	setPassword(passwordField.getText());
	setPasswordSaved(savePassword.getSelection());

	super.okPressed();
	}

	private Usersession getUsersessionIfKnown(String username) {

	if (getSelectedUsersession() != null && getSelectedUsersession().getUsername().equals(username)) {
	return getSelectedUsersession();
	}

	for (final Usersession session : knownUsersessions) {
	if (session.getUsername().equals(username)) {
	return session;
	}
	}
	return null;
	}

	/**
	*
	* {@inheritDoc}
	*
	* @see org.eclipse.jface.dialogs.Dialog#createButtonsForButtonBar(org.eclipse.swt.widgets.Composite)
	*/
	@Override
	protected void createButtonsForButtonBar(Composite parent) {
	createButton(parent,
	IDialogConstants.OK_ID,
	Messages.LoginDialog_Ok,
	true);
	createButton(parent,
	IDialogConstants.CANCEL_ID,
	Messages.LoginDialog_Cancel,
	false);
	}

	/**
	*
	* {@inheritDoc}
	*
	* @see org.eclipse.jface.dialogs.TitleAreaDialog#getInitialSize()
	*/
	@Override
	protected Point getInitialSize() {
	return new Point(400, 250);
	}

	/**
	* Clears the error message.
	*/
	private void flushErrorMessage() {
	setErrorMessage(null);
	}

	/**
	* Simple listener for loading the selected usersession if the user changes
	* the selected entry within the combo box that contains all known
	* usersessions.
	*
	* @author ovonwesen
	*
	*/
	private final class ComboListener implements ISelectionChangedListener,
	ModifyListener {
	private String lastText = StringUtils.EMPTY;

	public void selectionChanged(SelectionChangedEvent event) {
	final ISelection selection = event.getSelection();
	if (selection instanceof StructuredSelection) {
	final Object firstElement = ((StructuredSelection) selection)
	.getFirstElement();
	if (firstElement instanceof Usersession) {
	loadUsersession((Usersession) firstElement);
	}
	}
	}

	public void modifyText(ModifyEvent e) {
	final String text = usernameCombo.getCombo().getText();
	if (StringUtils.isNotBlank(text) && !text.equals(lastText)) {
	loadUsersession(getUsersessionIfKnown(text));
	lastText = text;
	}
	flushErrorMessage();
	}
	}

	}