A rewriting problem

[dick_hu]

I want to rewriting my page,code like this: 
public class AutoLoginLinkTransformer implements PageRenderLinkTransformer { 

        @Inject 
        private RequestGlobals requestGlobals; 

        @Inject 
        private MainLoginService loginService; 

        @Inject 
        private TypeCoercer typeCoercer; 

        private String usrid; 

        public PageRenderRequestParameters decodePageRenderRequest(Request
request) { 
                if (filter(request)) { 
                        return new
PageRenderRequestParameters(Space.class.getSimpleName(), 
                                        new ArrayEventContext(typeCoercer,
new Object[] { usrid }), 
                                        false); 
                } 
                return null; 
        } 

        public Link transformPageRenderLink(Link defaultLink, 
                        PageRenderRequestParameters parameters) { 
                return defaultLink; 
        } 

I want to the page rewriting to page "Space" and it sucess to the space,but
the browser's url is not change, 
how can I solve this problem? Or is there any interface replace the
"PageRenderLinkTransformer". 
My target is to add a filter,if it can not pass the filter's validate, then
page skip to another page.Is there any another way?  If can share the code
is best. 
Any one can help me, thanks a lot. 

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