tests/org.eclipse.jface.tests.databinding/src/org/eclipse/core/tests/internal/databinding/observable/masterdetail/DetailObservableValueTest.java

/*******************************************************************************
 * Copyright (c) 2006 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
 *     Brad Reynolds - bug 147515
 ******************************************************************************/

package org.eclipse.core.tests.internal.databinding.observable.masterdetail;

import org.eclipse.core.databinding.observable.IObservable;
import org.eclipse.core.databinding.observable.masterdetail.IObservableFactory;
import org.eclipse.core.databinding.observable.masterdetail.MasterDetailObservables;
import org.eclipse.core.databinding.observable.value.IObservableValue;
import org.eclipse.core.databinding.observable.value.WritableValue;
import org.eclipse.core.internal.databinding.observable.masterdetail.DetailObservableValue;
import org.eclipse.jface.tests.databinding.AbstractDefaultRealmTestCase;

/**
 * @since 3.2
 */
public class DetailObservableValueTest extends AbstractDefaultRealmTestCase {
	private WritableValue outerObservable;

	protected void setUp() throws Exception {
		super.setUp();
		outerObservable = new WritableValue();
	}

	public void testSetValue() throws Exception {
		WritableValueFactory factory = new WritableValueFactory();
		outerObservable.setValue("");

		IObservableValue detailObservable = MasterDetailObservables
				.detailValue(outerObservable, factory, null);
		WritableValue innerObservable = factory.innerObservable;
		Object value = new Object();

		assertFalse(value.equals(innerObservable.getValue()));
		detailObservable.setValue(value);
		assertEquals("inner value", value, innerObservable.getValue());
	}

	public void testGetValueType() throws Exception {
		DetailObservableValue detailObservable = new DetailObservableValue(outerObservable, null, String.class);
		assertEquals(String.class, detailObservable.getValueType());
	}
	
	/**
	 * Asserts that when a null value type is set for the detail observable no
	 * type checking is performed and the value type is always <code>null</code>.
	 */
	public void testGetValueTypeNullValueType() throws Exception {
		WritableValueFactory factory = new WritableValueFactory();
		DetailObservableValue detailObservable = new DetailObservableValue(
				outerObservable, factory, null);
		assertNull(detailObservable.getValueType());
		factory.type = String.class;

		// force the inner observable to be recreated
		outerObservable.setValue("1");
		assertNull("value type should be ignored", detailObservable.getValueType());
		
		factory.type = Object.class;

		// force the inner observable to be recreated
		outerObservable.setValue("2");
		assertNull("value type should be ignored", detailObservable.getValueType());
	}
	
	/**
	 * Factory that creates WritableValues with the target as the value.
	 */
	static class WritableValueFactory implements IObservableFactory {
		WritableValue innerObservable;
		Object type;
		
		public IObservable createObservable(Object target) {
			return innerObservable = new WritableValue(target, type);
		}		
	}
}