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package example;

import javax.servlet.http.HttpServletRequest;

import org.apache.struts2.StrutsStatics;

import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.Interceptor;

/**
 * Since websphere 5.1 doesn't retain the query string past a forward, this
 * interceptor populates the 2.4 query string servlet attribute.
 */
public class Websphere51QueryStringInterceptor implements Interceptor
{
  /** Servlet 2.4 location of the query string after a forward. */
  public static final String FORWARD_QUERY_STRING_ATTRIBUTE = "javax.servlet.forward.query_string";

  /**
   * @see com.opensymphony.xwork.interceptor.Interceptor#init()
   */
  public void init()
  {
  }

  /**
   * @see com.opensymphony.xwork2.interceptor.Interceptor#intercept(com.opensymphony.xwork2.ActionInvocation)
   */
  public String intercept(ActionInvocation invocation) throws Exception
  {
    HttpServletRequest request = (HttpServletRequest) invocation
      .getInvocationContext().get(StrutsStatics.HTTP_REQUEST);
    String queryString = request.getQueryString();
    if (queryString != null)
    {
      if (request.getAttribute(FORWARD_QUERY_STRING_ATTRIBUTE) == null)
      {
        request.setAttribute(FORWARD_QUERY_STRING_ATTRIBUTE, queryString);
      }
    }
    return invocation.invoke();
  }

  /**
   * @see com.opensymphony.xwork.interceptor.Interceptor#destroy()
   */
  public void destroy()
  {
  }
}