package com.atlassian.refapp.decorator;
   
   import org.slf4j.Logger;
   import org.slf4j.LoggerFactory;
   
   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 java.io.IOException;
  
  /**
   * A filter that looks for a query param that sets the Product Definition Language variable
   */
  public class PdlDarkToggleFilter implements Filter {
      private final Logger log = LoggerFactory.getLogger(getClass());
  
      public void init(FilterConfig filterConfig) throws ServletException {
      }
  
      public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain)
              throws IOException, ServletException {
          String pdl = servletRequest.getParameter("pdl.dir");
          if (pdl != null) {
              System.setProperty("pdl.dir", pdl);
              log.info("Product Design Language variable ${pdl.dir} now set to: {}", pdl);
          }
          filterChain.doFilter(servletRequest, servletResponse);
      }
  
      public void destroy() {
      }
  
  
  }