--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/org.eclipse.jface.examples.databinding/src/org/eclipse/jface/examples/databinding/snippets/Snippet027ExternalValidator.d	Sun Apr 19 11:33:55 2009 +0200
@@ -0,0 +1,262 @@
+/*******************************************************************************
+ * Copyright (c) 2008, 2009 Code 9 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:
+ *     Chris Aniszczyk <zx@code9.com> - initial API and implementation
+ *     Boris Bokowski, IBM - minor changes
+ ******************************************************************************/
+
+package org.eclipse.jface.examples.databinding.snippets;
+
+import java.beans.PropertyChangeListener;
+import java.beans.PropertyChangeSupport;
+
+import org.eclipse.core.databinding.DataBindingContext;
+import org.eclipse.core.databinding.beans.BeansObservables;
+import org.eclipse.core.databinding.observable.Realm;
+import org.eclipse.core.databinding.observable.value.IObservableValue;
+import org.eclipse.core.databinding.validation.MultiValidator;
+import org.eclipse.core.databinding.validation.ValidationStatus;
+import org.eclipse.core.runtime.IStatus;
+import org.eclipse.core.runtime.Status;
+import org.eclipse.jface.databinding.swt.SWTObservables;
+import org.eclipse.jface.databinding.wizard.WizardPageSupport;
+import org.eclipse.jface.wizard.IWizard;
+import org.eclipse.jface.wizard.Wizard;
+import org.eclipse.jface.wizard.WizardDialog;
+import org.eclipse.jface.wizard.WizardPage;
+import org.eclipse.swt.SWT;
+import org.eclipse.swt.layout.GridData;
+import org.eclipse.swt.layout.GridLayout;
+import org.eclipse.swt.widgets.Composite;
+import org.eclipse.swt.widgets.Display;
+import org.eclipse.swt.widgets.Label;
+import org.eclipse.swt.widgets.Text;
+
+/**
+ * This snippet demonstrates how to integrate an external validator
+ * 
+ * @since 3.5
+ */
+public class Snippet027ExternalValidator extends WizardPage {
+
+	private Text nameValue;
+	private Text emailValue;
+	private Text phoneNumberValue;
+
+	private Contact contact;
+
+	// Minimal JavaBeans support
+	public static abstract class AbstractModelObject {
+		private PropertyChangeSupport propertyChangeSupport = new PropertyChangeSupport(
+				this);
+
+		public void addPropertyChangeListener(PropertyChangeListener listener) {
+			propertyChangeSupport.addPropertyChangeListener(listener);
+		}
+
+		public void addPropertyChangeListener(String propertyName,
+				PropertyChangeListener listener) {
+			propertyChangeSupport.addPropertyChangeListener(propertyName,
+					listener);
+		}
+
+		public void removePropertyChangeListener(PropertyChangeListener listener) {
+			propertyChangeSupport.removePropertyChangeListener(listener);
+		}
+
+		public void removePropertyChangeListener(String propertyName,
+				PropertyChangeListener listener) {
+			propertyChangeSupport.removePropertyChangeListener(propertyName,
+					listener);
+		}
+
+		protected void firePropertyChange(String propertyName, Object oldValue,
+				Object newValue) {
+			propertyChangeSupport.firePropertyChange(propertyName, oldValue,
+					newValue);
+		}
+	}
+
+	static class Contact extends AbstractModelObject {
+		String name;
+		String email;
+		String phoneNumber;
+
+		public Contact(String name, String email, String number) {
+			this.name = name;
+			this.email = email;
+			this.phoneNumber = number;
+		}
+
+		public String getName() {
+			return name;
+		}
+
+		public void setName(String name) {
+			String oldValue = this.name;
+			this.name = name;
+			firePropertyChange("name", oldValue, name);
+		}
+
+		public String getEmail() {
+			return email;
+		}
+
+		public void setEmail(String email) {
+			String oldValue = this.email;
+			this.email = email;
+			firePropertyChange("email", oldValue, email);
+		}
+
+		public String getPhoneNumber() {
+			return phoneNumber;
+		}
+
+		public void setPhoneNumber(String number) {
+			String oldValue = this.phoneNumber;
+			this.phoneNumber = number;
+			firePropertyChange("phoneNumber", oldValue, number);
+		}
+
+		public IStatus validate() {
+			if (name.indexOf(' ') == -1) {
+				return ValidationStatus
+						.error("Please enter both first and last name separated by a space.");
+			}
+			if (email.indexOf('@') == -1) {
+				return ValidationStatus
+				.error("Please enter a valid email address containing '@'.");
+			}
+			if (!phoneNumber.startsWith("+")) {
+				return ValidationStatus
+				.error("Please enter the phone number in international format starting with '+'.");
+			}
+			return Status.OK_STATUS;
+		}
+
+	}
+
+	/**
+	 * Create the wizard
+	 */
+	public Snippet027ExternalValidator() {
+		super("snippet024");
+		setTitle("Snippet 024 - External Validation");
+		setDescription("Please enter contact details.");
+	}
+
+	/**
+	 * Create contents of the wizard
+	 * 
+	 * @param parent
+	 */
+	public void createControl(Composite parent) {
+		Composite container = new Composite(parent, SWT.NULL);
+		final GridLayout gridLayout = new GridLayout();
+		gridLayout.numColumns = 2;
+		container.setLayout(gridLayout);
+		setControl(container);
+
+		final Label nameLabel = new Label(container, SWT.NONE);
+		nameLabel.setText("Name");
+
+		nameValue = new Text(container, SWT.BORDER);
+		final GridData gd = new GridData(SWT.FILL, SWT.CENTER, true, false);
+		nameValue.setLayoutData(gd);
+
+		final Label emailLabel = new Label(container, SWT.NONE);
+		emailLabel.setText("Email");
+
+		emailValue = new Text(container, SWT.BORDER);
+		emailValue.setLayoutData(gd);
+
+		final Label phoneLabel = new Label(container, SWT.NONE);
+		phoneLabel.setText("Phone");
+
+		phoneNumberValue = new Text(container, SWT.BORDER);
+		phoneNumberValue.setLayoutData(gd);
+
+		contact = new Contact("BorisBokowski", "boris.at.somecompany.com",
+				"1-123-456-7890");
+
+		bindUI();
+	}
+
+	private void bindUI() {
+		DataBindingContext dbc = new DataBindingContext();
+
+		final IObservableValue name = BeansObservables.observeValue(contact,
+				"name");
+		dbc.bindValue(SWTObservables.observeText(nameValue, SWT.Modify), name,
+				null, null);
+
+		final IObservableValue email = BeansObservables.observeValue(contact,
+				"email");
+		dbc.bindValue(SWTObservables.observeText(emailValue, SWT.Modify),
+				email, null, null);
+
+		final IObservableValue phone = BeansObservables.observeValue(contact,
+				"phoneNumber");
+		dbc.bindValue(SWTObservables.observeText(phoneNumberValue, SWT.Modify),
+				phone, null, null);
+
+		MultiValidator validator = new MultiValidator() {
+			protected IStatus validate() {
+
+				// Everything accessed here will trigger re-validation.
+				name.getValue();
+				email.getValue();
+				phone.getValue();
+
+				System.out.println("Validating...");
+
+				return contact.validate();
+			}
+		};
+		dbc.addValidationStatusProvider(validator);
+
+		WizardPageSupport.create(this, dbc);
+	}
+
+	static class ExternalValidationWizard extends Wizard {
+		public void addPages() {
+			addPage(new Snippet027ExternalValidator());
+		}
+
+		public String getWindowTitle() {
+			return "Snippet 024 - External Validation";
+		}
+
+		public boolean performFinish() {
+			return true;
+		}
+	}
+
+	public static void main(String[] args) {
+		Display display = new Display();
+
+		Realm.runWithDefault(SWTObservables.getRealm(display), new Runnable() {
+			public void run() {
+				IWizard wizard = new ExternalValidationWizard();
+				WizardDialog dialog = new WizardDialog(null, wizard);
+				dialog.open();
+
+				// The SWT event loop
+				Display display = Display.getCurrent();
+				while (dialog.getShell() != null
+						&& !dialog.getShell().isDisposed()) {
+					if (!display.readAndDispatch()) {
+						display.sleep();
+					}
+				}
+			}
+		});
+
+		display.dispose();
+	}
+}
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