package xing.five.util;
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;
public class EncodingFilter implements Filter {
    
    protected String encoding = null;
    protected FilterConfig filterConfig = null;
    protected boolean ignore = true;
    public void init(FilterConfig filterConfig) throws ServletException {
        // TODO Auto-generated method stub
        this.filterConfig = filterConfig;
        this.encoding = filterConfig.getInitParameter("encoding");
        System.out.println("====initEncodingFilter");
        String value = filterConfig.getInitParameter("ignore");
        if(value == null){
            this.ignore = true;
        }
        else if(value.equalsIgnoreCase("true")){
            this.ignore = true;
        }
        else if(value.equalsIgnoreCase("yes")){
            this.ignore = true;
        }
        else{
            this.ignore = false;
        }
    }
    public void doFilter(ServletRequest request, ServletResponse response,
            FilterChain chain) throws IOException, ServletException {
        // TODO Auto-generated method stub
        if(ignore||(request.getCharacterEncoding() == null)){
            String encoding = selectEncoding(request);
            if(encoding!=null){
                request.setCharacterEncoding(encoding);
            }
        }
        chain.doFilter(request,response);
    }
    public void destroy() {
        // TODO Auto-generated method stub
        this.encoding = null;
        this.filterConfig = null;
    }
    protected String selectEncoding(ServletRequest request){
        return(this.encoding);
    }
}