/**
    * This file Copyright (c) 2011-2013 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.rendering.renderer.registry;
  
  import info.magnolia.objectfactory.Classes;
  import info.magnolia.registry.RegistrationException;
  import info.magnolia.registry.RegistryMap;
  import info.magnolia.rendering.context.RenderingListener;
  import info.magnolia.rendering.renderer.Renderer;
  
  import java.util.ArrayList;
  import java.util.List;
  import java.util.Set;
  
  import javax.inject.Singleton;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * Central registry of all renderers.
   */
  @Singleton
  public class RendererRegistry {
  
      private static final Logger log = LoggerFactory.getLogger(RendererRegistry.class);
  
      private final List<Class<RenderingListener>> listeners = new ArrayList<Class<RenderingListener>>();
  
      private final RegistryMap<String, RendererProvider> registry = new RegistryMap<String, RendererProvider>() {
  
          @Override
          protected String keyFromValue(RendererProvider provider) {
              return provider.getType();
          }
      };
  
      public Renderer getRenderer(String type) throws RegistrationException {
  
          RendererProvider provider;
          try {
              provider = registry.getRequired(type);
          } catch (RegistrationException e) {
              throw new RegistrationException("No renderer registered for type: " + type, e);
          }
  
          return provider.getRenderer();
      }
  
      public void register(RendererProvider rendererProvider) {
          registry.put(rendererProvider.getType(), rendererProvider);
      }
  
      public void unregister(String type) {
          registry.remove(type);
      }
  
      public Set<String> unregisterAndRegister(Set<String> registeredTypes, List<RendererProvider> providers) {
          return registry.removeAndPutAll(registeredTypes, providers);
      }
  
      public void registerListener(final String listenerClassName) {
          Class<RenderingListener> listenerClass;
          try {
              listenerClass = Classes.getClassFactory().forName(listenerClassName);
              if (!listeners.contains(listenerClassName)) {
                  getListeners().add(listenerClass);
              }
         } catch (ClassNotFoundException e) {
             log.error("{} was not found.", listenerClassName);
         }
     }
 
     public List<Class<RenderingListener>> getListeners() {
         return listeners;
     }
 }