package org.jzgs.telnumber.ec.Util;

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;

/**
 * <p>Company: NPower Technology Ltd.</p>
 * @author Zhao DongLu
 * @version 1.0
 */


public class I18nServletFilter extends HttpServlet implements Filter {
  private FilterConfig filterConfig;

  private String charset = "UTF-8";

  //Handle the passed-in FilterConfig
  public void init(FilterConfig filterConfig) throws ServletException {
    this.filterConfig = filterConfig;
    this.charset = filterConfig.getInitParameter("charset");
    if (this.charset == null || this.charset.trim().length() == 0) {
       this.charset = null;
    }
  }

  //Process the request/response pair
  public void doFilter(ServletRequest request, ServletResponse response, FilterChain filterChain) {
    try {
        if (this.charset != null) {
           I18nHttpServletRequestWrapper requestWrapper = new I18nHttpServletRequestWrapper( (HttpServletRequest) request,                                            charset);
           filterChain.doFilter(requestWrapper, response);
        } else {
          filterChain.doFilter(request, response);
        }
    } catch(ServletException sx) {
      filterConfig.getServletContext().log(sx.getMessage());
    } catch(IOException iox) {
      filterConfig.getServletContext().log(iox.getMessage());
    }
  }

  //Clean up resources
  public void destroy() {
    super.destroy();
  }
}