/**
    * This file Copyright (c) 2003-2011 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.cms.filters;
  
  import java.io.IOException;
  
  import javax.servlet.FilterChain;
  import javax.servlet.FilterConfig;
  import javax.servlet.ServletException;
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  
  import org.apache.commons.lang.ArrayUtils;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import info.magnolia.cms.util.CustomFilterConfig;
  import info.magnolia.cms.util.ServletUtils;
  
  /**
   * A single filter which in turn executes a chain of other filters.
   * @author fgiust
   * @version $Revision$ ($Author$)
   */
  public class CompositeFilter extends AbstractMgnlFilter {
  
      private static final Logger log = LoggerFactory.getLogger(CompositeFilter.class);
  
      private MgnlFilter[] filters = new MgnlFilter[0];
  
      @Override
      public void doFilter(HttpServletRequest request, HttpServletResponse response, FilterChain chain) throws IOException, ServletException {
  
          FilterChain fullchain = new MgnlFilterChain(chain, filters);
  
          fullchain.doFilter(request, response);
      }
  
      public MgnlFilter[] getFilters() {
          return filters;
      }
  
      public void setFilters(MgnlFilter[] filters) {
          this.filters = (MgnlFilter[]) ArrayUtils.addAll(this.filters, filters);
      }
  
      public void addFilter(MgnlFilter filter) {
          this.filters = (MgnlFilter[]) ArrayUtils.add(this.filters, filter);
      }
  
      @Override
      public void init(FilterConfig filterConfig) throws ServletException {
          initFilters(filterConfig);
      }
  
      /**
       * The first time called by the main filter.
       */
      public void initFilters(FilterConfig filterConfig) {
          for (MgnlFilter filter : filters) {
              try {
                  log.info("Initializing filter [{}]", filter.getName());
                  filter.init(new CustomFilterConfig(filter.getName(), filterConfig.getServletContext(), ServletUtils.initParametersToMap(filterConfig)));
              }
              catch (Exception e) {
                  log.error("Error initializing filter [" + filter.getName() + "]", e);
              }
          }
     }
 
     @Override
     public void destroy() {
         for (MgnlFilter filter : filters) {
             try {
                 filter.destroy();
             } catch (Exception e) {
                 log.error("Error destroying filter [" + filter.getName() + "]", e);
             }
         }
         filters = new MgnlFilter[0];
     }
 }