Java tutorial
package ch.cyberduck.core.updater; /* * Copyright (c) 2002-2016 iterate GmbH. All rights reserved. * https://cyberduck.io/ * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ import ch.cyberduck.core.Controller; import ch.cyberduck.core.Factory; import ch.cyberduck.core.FactoryException; import ch.cyberduck.core.SingleThreadController; import ch.cyberduck.core.preferences.PreferencesFactory; import org.apache.commons.lang3.reflect.ConstructorUtils; import org.apache.log4j.Logger; import java.lang.reflect.Constructor; import java.lang.reflect.InvocationTargetException; public class PeriodicUpdateCheckerFactory extends Factory<PeriodicUpdateChecker> { private static final Logger log = Logger.getLogger(PeriodicUpdateCheckerFactory.class); public PeriodicUpdateCheckerFactory() { super("factory.updater.class"); } public PeriodicUpdateChecker create(final Controller controller) { final String clazz = PreferencesFactory.get().getProperty("factory.updater.class"); if (null == clazz) { throw new FactoryException( String.format("No implementation given for factory %s", this.getClass().getSimpleName())); } try { final Class<PeriodicUpdateChecker> name = (Class<PeriodicUpdateChecker>) Class.forName(clazz); final Constructor<PeriodicUpdateChecker> constructor = ConstructorUtils .getMatchingAccessibleConstructor(name, controller.getClass()); if (null == constructor) { log.warn(String.format("No matching constructor for parameter %s", controller.getClass())); // Call default constructor for disabled implementations return name.newInstance(); } return constructor.newInstance(controller); } catch (InstantiationException | InvocationTargetException | ClassNotFoundException | IllegalAccessException e) { log.error(String.format("Failure loading callback class %s. %s", clazz, e.getMessage())); return new DisabledPeriodicUpdater(); } } public static PeriodicUpdateChecker get() { return get(new SingleThreadController()); } public static PeriodicUpdateChecker get(final Controller controller) { return new PeriodicUpdateCheckerFactory().create(controller); } }