Filter for removing blank id parameters

ParametersFilter.java

import java.io.IOException;
import java.util.Collections;
import java.util.Enumeration;
import java.util.Map;
import java.util.Map.Entry;

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 javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;

import com.google.common.base.Predicate;
import com.google.common.base.Strings;
import com.google.common.collect.Maps;

public class ParametersFilter implements Filter{

	public void destroy() {
	}

	public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException,
			ServletException {
	
		chain.doFilter(new HttpServletRequestWrapper((HttpServletRequest) req) {
			
			@Override
			public Map<String, String[]> getParameterMap() {
				return Maps.filterEntries(super.getParameterMap(), new Predicate<Entry<String,String[]>>() {

					@Override
					public boolean apply(Entry<String, String[]> entry) {
						return !entry.getKey().endsWith(".id")
							|| !Strings.isNullOrEmpty(entry.getValue()[0]);
					}
				});
			}
			
			@Override
			public Enumeration<String> getParameterNames() {
				return Collections.enumeration(getParameterMap().keySet());
			}
			
		}, res);
	}
	

	public void init(FilterConfig arg0) throws ServletException {
	}

}