code: public static String getNamePrefix( ServletContext servletContext, ServletRequest request, String name )
      {
          ArrayList/*< URLRewriter >*/ rewriters = getRewriters( request );
  
          InternalStringBuilder prefix = new InternalStringBuilder();
  
          if ( rewriters != null )
          {
              for ( Iterator i = rewriters.iterator(); i.hasNext(); )  
              {
                  URLRewriter rewriter = ( URLRewriter ) i.next();
                  String nextPrefix = rewriter.getNamePrefix( servletContext, request, name );
                  if ( nextPrefix != null ) { prefix.append( nextPrefix ); }
              }
          }
  
          return prefix.toString();
      }
docs: Get the prefix to use when rewriting a query parameter name.
  Loops through the list of registered URLRewriters to build up a the prefix.
  
  @param servletContext the current ServletContext.
  @param request        the current ServletRequest.
  @param name           the name of the query parameter.
  @return a prefix to use to rewrite a query parameter name.