/WEB-INF/classes/XslFilter.java.

• By David Geary
• March 24, 2001

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import beans.xsl.XslProcessorBean;

public class XslFilter implements Filter {
   private FilterConfig config;

   public void doFilter(ServletRequest request,
                        ServletResponse response,
                        FilterChain chain)
                  throws ServletException, java.io.IOException {
      XslProcessorBean    xslBean = new XslProcessorBean();
      ServletContext      context = config.getServletContext();
      HttpServletRequest  hrequest= (HttpServletRequest)request;
      String                 path = hrequest.getPathTranslated();
      String           stylesheet = getStylesheet(request, path);

      xslBean.process(new FileReader(new File(path)),
                      context.getResourceAsStream(stylesheet),
                      request, response);
   }
   public void setFilterConfig(FilterConfig config) {
      this.config = config;
   }
   public FilterConfig getFilterConfig() {
      return config;
   }
   private String getStylesheet(ServletRequest request,
                           String path) throws ServletException {
      String stylesheet = request.getParameter(‘stylesheet’);

      if(stylesheet == null) {
         String msg = ‘Please specify a stylesheet, like ‘ +
                      ‘this: ‘ + path + ‘?stylesheet.xsl’;

         throw new ServletException(msg);
      }
      return stylesheet;
   }
}