/*

  * 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.filters;

 import java.io.IOException;

 import javax.servlet.Filter;

 import javax.servlet.FilterChain;

 import javax.servlet.FilterConfig;

 import javax.servlet.ServletException;

 import javax.servlet.ServletRequest;

 import javax.servlet.ServletResponse;

 import net.admin4j.config.Admin4JConfiguration;

 import net.admin4j.deps.commons.lang3.StringUtils;

 import net.admin4j.util.ServletUtils;

 import org.slf4j.Logger;

 import org.slf4j.LoggerFactory;

 /**

  * This filter will log Web Transactions errors.

  * <p>Init parameters for this filter are as follows:</p>

  * <li>logger -- Optional.  Default net.admin4j.ui.filters.ErrorLoggingFilter</li>

  * @author D. Ashmore

  * @since 1.0

  */

 public class ErrorLoggingFilter implements Filter {

     private Logger logger = null;

     public void destroy() {

         // NoOp

     }

     public void doFilter(ServletRequest request, ServletResponse response,

             FilterChain chain) throws IOException, ServletException {

         try {chain.doFilter(request, response);}

         catch (Throwable t) {

             logger.error("Web Transaction Error", t);

             ServletUtils.reThrowServletFilterException(t);

         }

     }

     public void init(FilterConfig config) throws ServletException {

         new Admin4JConfiguration();

         String loggerName = config.getInitParameter("logger");

         if (StringUtils.isEmpty(loggerName)) {

             loggerName = Admin4JConfiguration.getWebTransactionErrorLoggerName();

         }

         if (StringUtils.isEmpty(loggerName)) {

             logger = LoggerFactory.getLogger(ErrorLoggingFilter.class);

         }

         else logger = LoggerFactory.getLogger(loggerName);

         Admin4JStandardFilterChain.registerFilter(this);

     }

     /**

      * Note:  Here for testing.

      * @return

      */

     protected Logger getLogger() {

         return logger;

     }

 }