--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/org.eclipse.jface.examples.databinding/src/org/eclipse/jface/examples/databinding/snippets/Snippet011ValidateMultipleBindingsSnippet.d	Sun Apr 19 11:33:55 2009 +0200
@@ -0,0 +1,129 @@
+ /*******************************************************************************
+ * Copyright (c) 2007 Brad Reynolds 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:
+ *     Brad Reynolds - initial API and implementation
+ ******************************************************************************/
+
+package org.eclipse.jface.examples.databinding.snippets;
+
+import org.eclipse.core.databinding.DataBindingContext;
+import org.eclipse.core.databinding.UpdateValueStrategy;
+import org.eclipse.core.databinding.observable.Realm;
+import org.eclipse.core.databinding.observable.value.IObservableValue;
+import org.eclipse.core.databinding.observable.value.IValueChangeListener;
+import org.eclipse.core.databinding.observable.value.ValueChangeEvent;
+import org.eclipse.core.databinding.observable.value.WritableValue;
+import org.eclipse.core.databinding.validation.IValidator;
+import org.eclipse.core.databinding.validation.ValidationStatus;
+import org.eclipse.core.runtime.IStatus;
+import org.eclipse.jface.databinding.swt.SWTObservables;
+import org.eclipse.swt.SWT;
+import org.eclipse.swt.layout.GridLayout;
+import org.eclipse.swt.widgets.Composite;
+import org.eclipse.swt.widgets.Display;
+import org.eclipse.swt.widgets.Shell;
+import org.eclipse.swt.widgets.Text;
+
+/**
+ * Snippet that validates values across multiple bindings on change of each
+ * observable. If the values of the target observables are not equal the model
+ * is not updated. When the values are equal they will be written to sysout.
+ * 
+ * @author Brad Reynolds
+ */
+public class Snippet011ValidateMultipleBindingsSnippet {
+	public static void main(String[] args) {
+		Realm.runWithDefault(SWTObservables.getRealm(Display.getDefault()),
+				new Runnable() {
+					public void run() {
+						Snippet011ValidateMultipleBindingsSnippet.run();
+					}
+				});
+	}
+
+	private static void run() {
+		Shell shell = new Shell();
+
+		View view = new View(shell);
+		final Model model = new Model();
+
+		DataBindingContext dbc = new DataBindingContext();
+		dbc.bindValue(SWTObservables.observeText(view.text1, SWT.Modify),
+				model.value1, new UpdateValueStrategy()
+						.setAfterConvertValidator(new CrossFieldValidator(
+								model.value2)), null);
+		dbc.bindValue(SWTObservables.observeText(view.text2, SWT.Modify),
+				model.value2, new UpdateValueStrategy()
+						.setAfterConvertValidator(new CrossFieldValidator(
+								model.value1)), null);
+
+		// DEBUG - print to show value change
+		model.value1.addValueChangeListener(new IValueChangeListener() {
+			public void handleValueChange(ValueChangeEvent event) {
+				System.out.println("Value 1: " + model.value1.getValue());
+			}
+		});
+
+		// DEBUG - print to show value change
+		model.value2.addValueChangeListener(new IValueChangeListener() {
+			public void handleValueChange(ValueChangeEvent event) {
+				System.out.println("Value 2: " + model.value2.getValue());
+			}
+		});
+
+		shell.pack();
+		shell.open();
+		Display display = shell.getDisplay();
+		while (!shell.isDisposed()) {
+			if (!display.readAndDispatch())
+				display.sleep();
+		}
+		display.dispose();
+	}
+
+	/**
+	 * @since 3.2
+	 * 
+	 */
+	private static final class CrossFieldValidator implements IValidator {
+		/**
+		 * 
+		 */
+		private final IObservableValue other;
+
+		/**
+		 * @param model
+		 */
+		private CrossFieldValidator(IObservableValue other) {
+			this.other = other;
+		}
+
+		public IStatus validate(Object value) {
+			if (!value.equals(other.getValue())) {
+				return ValidationStatus.ok();
+			}
+			return ValidationStatus.error("values cannot be the same");
+		}
+	}
+
+	static class Model {
+		WritableValue value1 = new WritableValue();
+		WritableValue value2 = new WritableValue();
+	}
+
+	static class View {
+		Text text1;
+		Text text2;
+
+		View(Composite composite) {
+			composite.setLayout(new GridLayout(2, true));
+			text1 = new Text(composite, SWT.BORDER);
+			text2 = new Text(composite, SWT.BORDER);
+		}
+	}
+}