Java tutorial
/* * Copyright 2012 Guido Steinacker * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package de.otto.jsonhome.controller; import de.otto.jsonhome.generator.JsonHomeGenerator; import de.otto.jsonhome.generator.JsonHomeSource; import de.otto.jsonhome.model.JsonHome; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.context.ApplicationContext; import org.springframework.stereotype.Component; import org.springframework.stereotype.Controller; import java.util.*; /** * @author Guido Steinacker * @since 24.11.12 */ @Component public class GeneratorBasedJsonHomeSource implements JsonHomeSource { private static Logger LOG = LoggerFactory.getLogger(GeneratorBasedJsonHomeSource.class); private JsonHomeGenerator jsonHomeGenerator; private Set<Class<?>> controllerTypes = Collections.emptySet(); private volatile JsonHome jsonHome = null; @Autowired public void setJsonHomeGenerator(final JsonHomeGenerator jsonHomeGenerator) { LOG.info("Using {} to generate JsonHome.", jsonHomeGenerator.getClass().getName()); this.jsonHomeGenerator = jsonHomeGenerator; } @Autowired public void setApplicationContext(final ApplicationContext applicationContext) { final Map<String, Object> controllerBeans = applicationContext.getBeansWithAnnotation(Controller.class); controllerTypes = new HashSet<Class<?>>(); for (Object o : controllerBeans.values()) { controllerTypes.add(o.getClass()); } LOG.info("Found {} controllers in application context", controllerTypes.size()); } /** * Directly inject controller types instead of injecting the ApplicationContext. * <p/> * Used for testing purposes. * * @param controllerTypes the list of controller classes. */ public void setControllerTypes(final Class<?>... controllerTypes) { this.controllerTypes = new HashSet<Class<?>>(controllerTypes.length); for (final Class<?> controllerType : Arrays.asList(controllerTypes)) { this.controllerTypes.add(controllerType); } } @Override public final JsonHome getJsonHome() { if (jsonHome == null) { synchronized (this) { if (jsonHome == null) { LOG.info("Generating JsonHome..."); jsonHome = jsonHomeGenerator.with(controllerTypes).generate(); LOG.info("Generated JsonHome containing {} relation types.", jsonHome.getResources().size()); } } } return jsonHome; } }