Description of problem:

Consider a URL /apps/plaintext/ccm/portal/homepage.jsp

The /apps/ bit is the context prefix, the /plaintext/ bit is the
dispatcher prefix and the /ccm/ bit is the servlet prefix.
Unfortunately the c.a.web.URL class chops the components out in the
order context, servlet, dispatcher prefixes. So when it re-consistutes
the URL you get /apps/ccm/plaintext/portal/homepage.jsp which
obviously doesn't dispatch to anything.

This bug looks like it was always there, but we didn't encounter it
previously because we always mounted apps on / instead of /ccm.


In addition the PageTransformer class is adding the dispatcher prefix
onto the end of the context-prefix variable, so it ends up duplicated
thus:  /ccm/text/text

Version-Release number of selected component (if applicable):


How reproducible:
Always


Steps to Reproduce:
1. Add in an instance of the InternalPrefixerServlet to web.xml
2. Visit the homepage using the prefix defined in web.xml
3. Look at the XML source to view the any URLs in the page
  
Actual results:
URLs are  starting with /ccm/text/pvt


Expected results:
URLs are starting with /text/ccm/pvt


Additional info:

The patch is:

====
//core-platform/dev/src/com/arsdigita/bebop/page/PageTransformer.java#5
-
/var/ccm-devel/dev/dan/aplaws-rickshaw/core/src/com/arsdigita/bebop/page/PageTransformer.java
====
245,247c245
<                  com.arsdigita.web.URL.getDispatcherPath() +
<                  (DispatcherHelper.getDispatcherPrefix(req) == null
? "" :
<                   DispatcherHelper.getDispatcherPrefix(req)));
---
>                  com.arsdigita.web.URL.getDispatcherPath());
==== //core-platform/dev/src/com/arsdigita/web/URL.java#29 -
/var/ccm-devel/dev/dan/aplaws-rickshaw/core/src/com/arsdigita/web/URL.java
====
229,231d228
<         m_url.append(servletPath);
<         m_servletPathEnd = m_url.length();
< 
236a234,236
>         m_url.append(servletPath);
>         m_servletPathEnd = m_url.length();
> 
457a458,466
>      * <p>Experimental</p>
>      * <p>Returns the dispatcher prefix of this request as
>      * set by the InternalPrefixerServlet
>      */
>     public final String getDispatcherPrefix() {
>         return m_url.substring(m_contextPathEnd, m_dispatcherPrefixEnd);
>     }
> 
>     /**
465c474
<         return m_url.substring(m_contextPathEnd, m_servletPathEnd);
---
>         return m_url.substring(m_dispatcherPrefixEnd, m_servletPathEnd);
469,477d477
<      * <p>Experimental</p>
<      * <p>Returns the dispatcher prefix of this request as
<      * set by the InternalPrefixerServlet
<      */
<     public final String getDispatcherPrefix() {
<         return m_url.substring(m_servletPathEnd, m_dispatcherPrefixEnd);
<     }
< 
<     /**
488c488
<         final String pathInfo = m_url.substring(m_dispatcherPrefixEnd);
---
>         final String pathInfo = m_url.substring(m_servletPathEnd);
885c885
<                 return context + servlet + prefix;
---
>                 return context + prefix + servlet;