http://blog.sforce.com/sforce/2010/05/url-rewriting-for-your-customizing-your-site-urls.html


global class ApexClassName implements Site.UrlRewriter {

  global PageReference mapRequestUrl(PageReference externalUrl) {//}

   global List<PageReference> generateUrlFor(List<PageReference> myForcedotcomUrls) {//...}

}

Note that a developer may not need all of the methods and may choose to return a null. 

Here is the implementation of our the global Apex class that maps the URLs from our example: 

global class myRewriter implements Site.UrlRewriter {

 //Variables to represent the friendly URLs for pages

 String DIRECTORY = '/friendly/';

 //Variables to represent my custom Visualforce pages that display page information

 String VISUALFORCE_PAGE = '/page?pageid=';

 // The first global method for mapping external URL to an internal one

 global PageReference mapRequestUrl(PageReference myFriendlyUrl){

    String url = myFriendlyUrl.getUrl();

    if(url.startsWith(DIRECTORY)){

       String name = url.substring(DIRECTORY.length(),url.length());

       //Select the ID of the page that matches the name from the URL

       Page__c site_page = [select id from Page__c where name =:name LIMIT 1];

       //Construct a new page reference in the form of my Visualforce page

       return new PageReference(VISUALFORCE_PAGE + site_page.id);

    }

    //If the URL isn't in the form of a cmasforce page, continue with the request

    return null;

  }

  // The second global method for mapping internal Ids to URLs

  global List<PageReference> generateUrlFor(List<PageReference> mySalesforceUrls){

    //A list of pages to return after all the links have been evaluated

    List<PageReference> myFriendlyUrls = new

    List<PageReference>();

    for(PageReference mySalesforceUrl : mySalesforceUrls){

      //Get the URL of the page

      String url = mySalesforceUrl.getUrl();

      //If this looks like a page that needs to be mapped, transform it

      if(url.startsWith(VISUALFORCE_PAGE)){

        //Extract the ID from the query parameter

        String id= url.substring(VISUALFORCE_PAGE.length(), url.length());

        //Query for the name of the cmsforce page to put in the URL

        Page__c site_page2 = [select name from Page__c where id =:id LIMIT 1];

        //Construct the new URL

        myFriendlyUrls.add(new PageReference(DIRECTORY+ site_page2.name));

     }  

     else {

       //If this doesn't start like an cmsforce page, don't do any transformations

       myFriendlyUrls.add(mySalesforceUrl);

     }

  }

  //Return the full list of pages

  return myFriendlyUrls;

  }

}

@umityalcinalp URLRewriter

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