Java tutorial
/** * This file Copyright (c) 2010-2012 Magnolia International * Ltd. (http://www.magnolia-cms.com). All rights reserved. * * * This file is dual-licensed under both the Magnolia * Network Agreement and the GNU General Public License. * You may elect to use one or the other of these licenses. * * This file is distributed in the hope that it will be * useful, but AS-IS and WITHOUT ANY WARRANTY; without even the * implied warranty of MERCHANTABILITY or FITNESS FOR A * PARTICULAR PURPOSE, TITLE, or NONINFRINGEMENT. * Redistribution, except as permitted by whichever of the GPL * or MNA you select, is prohibited. * * 1. For the GPL license (GPL), you can redistribute and/or * modify this file under the terms of the GNU General * Public License, Version 3, as published by the Free Software * Foundation. You should have received a copy of the GNU * General Public License, Version 3 along with this program; * if not, write to the Free Software Foundation, Inc., 51 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * 2. For the Magnolia Network Agreement (MNA), this file * and the accompanying materials are made available under the * terms of the MNA which accompanies this distribution, and * is available at http://www.magnolia-cms.com/mna.html * * Any modifications to this file must keep this entire header * intact. * */ package info.magnolia.objectfactory; import info.magnolia.cms.core.SystemProperty; import info.magnolia.context.MgnlContext; import info.magnolia.test.ComponentsTestUtil; import info.magnolia.test.TestMagnoliaConfigurationProperties; import info.magnolia.test.mock.MockComponentProvider; import org.junit.After; import org.junit.Before; import org.junit.Test; import static org.junit.Assert.*; import org.apache.commons.beanutils.ConstructorUtils; import java.lang.reflect.Field; import java.util.Date; /** * @version $Id$ */ public class ClassesTest { @Before public void setUp() throws Exception { SystemProperty.clear(); SystemProperty.setMagnoliaConfigurationProperties(new TestMagnoliaConfigurationProperties()); Components.setComponentProvider(new MockComponentProvider(SystemProperty.getProperties())); resetCFP(); } @After public void tearDown() throws Exception { resetCFP(); SystemProperty.clear(); Components.setComponentProvider(null); ComponentsTestUtil.clear(); MgnlContext.setInstance(null); } private void resetCFP() throws NoSuchFieldException, IllegalAccessException { // reset the classFactoryProvider field. TODO: really wish i could have made this one final ... final Field cfpField = Classes.class.getDeclaredField("cfp"); cfpField.setAccessible(true); cfpField.set(null, new Classes.ClassFactoryProvider(new DefaultClassFactory())); } @Test public void testDefaultClassFactoryWorksJustFine() throws ClassNotFoundException { final String s = Classes.newInstance("java.lang.String", "hello"); assertEquals("hello", s); final ClassFactory cf = Classes.getClassFactory(); assertTrue(cf instanceof DefaultClassFactory); } @Test public void testCanSetupADifferentClassFactory() throws ClassNotFoundException { SystemProperty.setProperty(ClassFactory.class.getName(), TestClassFactory.class.getName()); final String s = Classes.newInstance("chalala", "hello"); // this validates we're indeed using our custom TestClassFactory, since "chalala" isn't a real class name, afaik. assertEquals("hello", s); final ClassFactory cf = Classes.getClassFactory(); assertTrue(cf instanceof TestClassFactory); } /* @Test public void testCanSetupADifferentClassFactoryThatNeedsComponents() throws ClassNotFoundException { // TODO This test is ignored for now since registering components via SystemProperty is no longer supported. SystemProperty.setProperty(ClassFactory.class.getName(), TestClassFactoryWithComponents.class.getName()); SystemProperty.setProperty(Whatever.class.getName(), Chenanigans.class.getName()); final String s = Classes.newInstance("chalala", "hello"); assertEquals("hello", s); final Whatever w = Components.getSingleton(Whatever.class); assertEquals(327, w.blah()); final ClassFactory cf = Classes.getClassFactory(); assertTrue(cf instanceof TestClassFactoryWithComponents); final TestClassFactoryWithComponents cfc = (TestClassFactoryWithComponents) cf; assertTrue(cfc.getWhatever() instanceof Chenanigans); assertEquals(327, cfc.getWhatever().blah()); final Calendar now = Calendar.getInstance(); // a fairly vague comparison of those two dates final Calendar then = Calendar.getInstance(); then.setTime(cfc.getDate()); assertEquals(now.get(Calendar.DAY_OF_YEAR), then.get(Calendar.DAY_OF_YEAR)); } */ public static interface Whatever { int blah(); } public static class Chenanigans implements Whatever { @Override public int blah() { return 327; } } /** * forName only accepts test-specific names, and newInstance() implementations don't handle exceptions, don't check params/types and don't take any shortcut either. */ public static class TestClassFactory implements ClassFactory { public TestClassFactory() { } @Override public <C> Class<C> forName(String className) throws ClassNotFoundException { if ("chalala".equals(className)) { return (Class<C>) String.class; } throw new IllegalStateException("unexpected call with " + className); } @Override public <T> T newInstance(Class<T> c, Object... params) { try { return (T) ConstructorUtils.invokeConstructor(c, params); } catch (Exception e) { throw new RuntimeException(e); } } @Override public <T> T newInstance(Class<T> c, Class<?>[] argTypes, Object... params) { try { return (T) ConstructorUtils.invokeExactConstructor(c, params, argTypes); } catch (Exception e) { throw new RuntimeException(e); } } } public static class TestClassFactoryWithComponents extends TestClassFactory { private final ClassFactory delegate; private final Whatever whatever; private final Date date; public TestClassFactoryWithComponents() throws ClassNotFoundException { this.delegate = new DefaultClassFactory(); this.whatever = Components.getSingleton(Whatever.class); this.date = Classes.newInstance("java.util.Date"); } public Whatever getWhatever() { return whatever; } public Date getDate() { return date; } } }