Webwork - iterator

package br.com.usiinformatica.webwork.wrapper;

import java.io.IOException;

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;

/**
 * @web.filter name = "JSTLFilter" description = "Filtro para permitir trabalhar com WebWork e JSTL ao mesmo tempo"
 * @web.filter-mapping url-pattern = "*.jsp"
 * @web.filter-mapping url-pattern = "*.action"
 * 
 * @author Rodrigo
 *
 * To change the template for this generated type comment go to
 * Window - Preferences - Java - Code Generation - Code and Comments
 */
public class JSTLFilter implements javax.servlet.Filter {
	private static final String RUNONCE_REQUEST_ATTRIBUTE = "__run_once_" + JSTLFilter.class.getName();
	private static final Object RUNONCE_REQUEST_VALUE = new Object();
	FilterConfig _filterConfig;
	public FilterConfig getFilterConfig() {
		return _filterConfig;
	}
	public void setFilterConfig(FilterConfig filterConfig) {        _filterConfig = filterConfig;
	}
	public void init(FilterConfig filterConfig) throws ServletException {
	}
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
		Object attribute = request.getAttribute(RUNONCE_REQUEST_ATTRIBUTE);
		// Make sure it is an HttpServletRequest, if so, create the wrapper and pass it on
		if (attribute == null && request instanceof HttpServletRequest) {
			ServletRequest wrappedRequest = new JSTLRequestWrapper((HttpServletRequest) request);
			chain.doFilter(wrappedRequest, response);
			request.setAttribute(RUNONCE_REQUEST_ATTRIBUTE, RUNONCE_REQUEST_VALUE);
		} else {
			// Otherwise, just pass the request on down the chain
			chain.doFilter(request, response);
		}
	}
	public void destroy() {
	}
}

package br.com.usiinformatica.webwork.wrapper;

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

import webwork.util.ServletValueStack;
import webwork.util.ValueStack;

public class JSTLRequestWrapper extends HttpServletRequestWrapper {
	private ServletRequest wrappedRequest;
	public JSTLRequestWrapper(HttpServletRequest request) {
		super(request);
		wrappedRequest = request;
	}
	public Object getAttribute(String s) {
		Object attribute = super.getAttribute(s);
		if (attribute == null) {
			// If not found, then try the ValueStack
			ValueStack stack = ServletValueStack.getStack(wrappedRequest);
			if (stack != null) {
				attribute = stack.findValue(s);
			}
		}
		return attribute;
	}
}

<filter>
      <filter-name>JSTLFilter</filter-name>
      <description><![CDATA[Filtro para permitir trabalhar com WebWork e JSTL ao mesmo tempo]]></description>
      <filter-class>br.com.usiinformatica.webwork.wrapper.JSTLFilter</filter-class>
   </filter>

   <filter-mapping>
      <filter-name>JSTLFilter</filter-name>
      <url-pattern>*.jsp</url-pattern>
   </filter-mapping>
   <filter-mapping>
      <filter-name>JSTLFilter</filter-name>
      <url-pattern>*.action</url-pattern>
   </filter-mapping>