/*

  * This software is licensed under the Apache License, Version 2.0

  * (the "License") agreement; 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 net.admin4j.ui.servlets;

 import java.util.HashMap;

 import java.util.HashSet;

 import java.util.Map;

 import java.util.Set;

 import javax.servlet.ServletConfig;

 import javax.servlet.ServletException;

 import javax.servlet.http.HttpServlet;

 import org.slf4j.Logger;

 import org.slf4j.LoggerFactory;

 import net.admin4j.config.Admin4JConfiguration;

 /**

  * Base servlet for all Admin4J Servlets.  

  * @author D. Ashmore

  *

  */

 abstract class Admin4JServlet extends HttpServlet {

     private static final long serialVersionUID = -1960693935838064409L;

     @SuppressWarnings("rawtypes")

     private static Map<Class, Set<HttpServlet>> registryMap = new HashMap<Class, Set<HttpServlet>>();

     protected Logger logger = LoggerFactory.getLogger(this.getClass());

     /* (non-Javadoc)

      * @see javax.servlet.GenericServlet#init(javax.servlet.ServletConfig)

      */

     @Override

     public void init() throws ServletException {

         super.init();

         logger.debug("Initializing Servlet {}", this.getClass().getName());

         new Admin4JConfiguration();

         synchronized(registryMap) {

             Set<HttpServlet> registrySet = registryMap.get(this.getClass());

             if (registrySet == null) {

                 registrySet = new HashSet<HttpServlet>();

                 registryMap.put(this.getClass(), registrySet);

             }

             registrySet.add(this);

         }

     }

     /* (non-Javadoc)

      * @see javax.servlet.GenericServlet#init()

      */

     @Override

     public void init(ServletConfig config) throws ServletException {

         this.init();

     }

     public static Set<HttpServlet> getRegisteredServletSet(@SuppressWarnings("rawtypes") Class klass) {

         Set<HttpServlet> registrySet = new HashSet<HttpServlet>();

         synchronized(registryMap) {

             if (registryMap.containsKey(klass)) {

                 registrySet.addAll(registryMap.get(klass));

             }

         }

         return registrySet;

     }

     public abstract boolean hasDisplay();

 }