tests/org.eclipse.e4.core.tests/src/org/eclipse/e4/core/internal/tests/di/RecursiveObjectCreationTest.java

/*******************************************************************************
 * Copyright (c) 2011, 2015 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *     Lars Vogel <Lars.Vogel@vogella.com> - Bug 474274
 ******************************************************************************/
package org.eclipse.e4.core.internal.tests.di;

import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertTrue;

import javax.annotation.PostConstruct;
import javax.inject.Inject;

import org.eclipse.e4.core.contexts.ContextInjectionFactory;
import org.eclipse.e4.core.contexts.EclipseContextFactory;
import org.eclipse.e4.core.contexts.IEclipseContext;
import org.eclipse.e4.core.di.InjectionException;
import org.junit.Test;

public class RecursiveObjectCreationTest {

	static public class CheckSelfInject {

		public CheckSelfInject other;

		@Inject
		public CheckSelfInject(CheckSelfInject other) {
			this.other = other;
		}
	}

	/**
	 * Checks a simple case of constructor needing the same class
	 */
	@Test
	public void testSelfInject() {
		IEclipseContext context = EclipseContextFactory.create();
		boolean exceptionReceived = false;
		try {
			CheckSelfInject testInstance = ContextInjectionFactory.make(CheckSelfInject.class, context);
			assertNotNull(testInstance); // unreachable
		} catch (InjectionException e) {
			exceptionReceived = true;
		}
		assertTrue(exceptionReceived);
	}

	///////////////////////////////////////////////////////////////////////

	static public class TestOuterClass {

		public class TestInnerClassInject {
			@Inject
			public TestInnerClassInject() {
				// placeholder
			}
		}

		public TestInnerClassInject innerInject;

		@Inject
		public TestOuterClass() {
			// placeholder
		}

		@PostConstruct
		public void init(IEclipseContext context) {
			innerInject = ContextInjectionFactory.make(TestInnerClassInject.class, context);
		}
	}

	/**
	 * Checks inner class using outer class which is still being created
	 */
	@Test
	public void testNested() {
		IEclipseContext context = EclipseContextFactory.create();
		boolean exceptionReceived = false;
		try {
			TestOuterClass outer = ContextInjectionFactory.make(TestOuterClass.class, context);
			assertNotNull(outer); // unreachable
		} catch (InjectionException e) {
			exceptionReceived = true;
		}
		assertTrue(exceptionReceived);
	}
}