XBindingsJava7Test.java

/*******************************************************************************
 * Copyright (c) 2012 Michael Vorburger (http://www.vorburger.ch).
 * 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
 *******************************************************************************/

package ch.vorburger.xbindings.tests;

import static org.junit.Assert.assertEquals;

import org.junit.Test;

import org.eclipse.xtext.xbase.lib.Procedures.Procedure0;

import ch.vorburger.xbindings.XBinding;
import ch.vorburger.xbindings.property.Property;
import ch.vorburger.xbindings.property.PropertyImpl;

/**
 * XBindings Test (and example) written in Java (without lambda expressions / closures).
 * 
 * @author Michael Vorburger
 */
public class XBindingsJava7Test {

	// TODO try to write this with Java v8 lambda expressions (closures) !
	// https://bugs.eclipse.org/bugs/show_bug.cgi?id=380188

	Property<String> aName = new PropertyImpl<String>();
	Property<String> bName = new PropertyImpl<String>();
	
	@Test
	public void testBasic() {
		aName.set("Yuhu");

		new XBinding(new Procedure0() {
			public void apply() {
				bName.set("hello, " + aName.get());
			}
		});
		
		assertEquals("hello, Yuhu", bName.get());
		
		aName.set("Yoho");
		assertEquals("hello, Yoho", bName.get());
	}
	
	@Test(expected=IllegalArgumentException.class)
	public void testExceptionInInitialBinding() {
		new XBinding(new Procedure0() {
			public void apply() {
				throw new IllegalArgumentException();
			}
		});
	}
	
	@Test(expected=IllegalArgumentException.class)
	public void testExceptionLaterInRePlayingBinding() {
		aName.set("Yuhu");
		new XBinding(new Procedure0() {
			public void apply() {
				if (aName.get() != null)
					bName.set("hello, " + aName.get());
				else
					throw new IllegalArgumentException();
			}
		});
		aName.set(null);
	}

}