CODEWITHSUNDEEP
javaurl-rewritingtapestry
Pratik Patel
Pratik Patel

Reputation: 1345

Tapestry5 : URL Re-writing : Pass parameters to transformPageRenderLink method

I am upgrading tapestry from 5.2.4 to 5.3.8 and am stuck at re-implementing the URL re-writing part.

In my application a user account can have multiple data stores. User can have same page of different stores active at the same time. Hence I need to put the storeId in page links and event links URLs. So What is done is as follows.

I register MyLinkTransformerClass in AppModule as follows.

    @Contribute(PageRenderLinkTransformer.class)
    @Primary
    public static void provideURLRewriting( OrderedConfiguration<PageRenderLinkTransformer> configuration){ 

       configuration.addInstance(
          "Faces", MyLinkTransformer.class);
    }

Following is the MyLinkTransformer class which implements PageRenderLinkTransformer

public PageRenderRequestParameters decodePageRenderRequest(
                  Request request) {

      // for incoming requests - remove the store id from URL and 
      // save into Request as an attribute

      String path = request.getPath();
      if (path.equals("/")) {
             // Redirect to accounts page
             return new PageRenderRequestParameters("account", new EmptyEventContext(), false);
         }
         else {
             String start = path.split("/")[1];
             if (!ignoredRewriteSet.contains(start) && !start.startsWith("account")) {
                 String storePath = path.substring(1).substring(path.indexOf("/"));
                 int idx = storePath.indexOf("/");
                 if (idx < 0) idx = storePath.length();
                 String storeId = storePath.substring(0, idx).trim();
                 RequestHelper.setStoreId(request, storeId);
                 EventContext urlEventContext = new URLEventContext(contextValueEncoder, new String[]{storeId});
                 EventContext arrayEventContext = new ArrayEventContext(typeCoercer, "foo");    
                 return new PageRenderRequestParameters(storePath.substring(idx), arrayEventContext, false);
                 //return new PageRenderRequestParameters(storePath.substring(idx), new EmptyEventContext(), false);
             }
     }

      return null;
    }

   public Link transformPageRenderLink(
         Link defaultLink,
         PageRenderRequestParameters parameters) {

      // for outgoing requests- This is where I want to access the store Id 
      // which is stored in Request class of Tapestry as an attribute and 
      // add it to the URL

      return null;
   }

So, the idea is to remove storeId from URL in decodePageRenderRequest method and save it in the Request class of Tapestry as an attribute. And while creating outgoing URLs of page link and event link, I want to access the storeId which was saved in Request and inject it to the URL which will be rendered in method transformPageRenderLink.

But I don't know how to pass parameters to transformPageRenderLink method or access Request instance there.

I am following http://blog.tapestry5.de/index.php/2010/09/06/new-url-rewriting-api/ example. I am new to URL Rewriting, any help with this will be appreciated.

Upvotes: 0

Views: 688

Answers (1)

lance-java
lance-java

Reputation: 27994

You will probably be interested in the ModeComponentEventLinkEncoder here. It removes a "mode" from the URL and puts it onto the Environment before passing it on to the normal tapestry URL processing.

It's a two way process so the "mode" is included in any links generated on the page.

Note: This is applied as a decorator here

Upvotes: 1

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