bug 336056 Ability to override the computation of the ContextHandler to deploy the DefaultServlet on equinox's HttpServiceServlet.

git-svn-id: svn+ssh://dev.eclipse.org/svnroot/rt/org.eclipse.jetty/jetty/trunk@3104 7e9141cc-0065-0410-87d8-b60c137991c4

VERSION.txt

@@ -19,6 +19,7 @@ jetty-7.4.1-SNAPSHOT
  + JETTY-1326 Invoker names not hashCode based
  + JETTY-1343 IllegalArgumentException for bad % encodings
  + JETTY-1347 Updated ServletHander javadoc
+ + 336056 Ability to override the computation of the ContextHandler to deploy the DefaultServlet on the HttpService
 
 jetty-7.4.0.v20110414
  + 342504 Scanner Listener

jetty-servlet/src/main/java/org/eclipse/jetty/servlet/DefaultServlet.java

@@ -162,11 +162,7 @@ public class DefaultServlet extends HttpServlet implements ResourceFactory
     throws UnavailableException
     {
         _servletContext=getServletContext();
-        ContextHandler.Context scontext=ContextHandler.getCurrentContext();
-        if (scontext==null)
-            _contextHandler=((ContextHandler.Context)_servletContext).getContextHandler();
-        else
-            _contextHandler = ContextHandler.getCurrentContext().getContextHandler();
+        _contextHandler = initContextHandler(_servletContext);
 
         _mimeTypes = _contextHandler.getMimeTypes();
 
@@ -284,6 +280,29 @@ public class DefaultServlet extends HttpServlet implements ResourceFactory
         if (Log.isDebugEnabled()) Log.debug("resource base = "+_resourceBase);
     }
 
+    /**
+     * Compute the field _contextHandler.<br/>
+     * In the case where the DefaultServlet is deployed on the HttpService it is likely that
+     * this method needs to be overwritten to unwrap the ServletContext facade until we reach
+     * the original jetty's ContextHandler.
+     * @param servletContext The servletContext of this servlet.
+     * @return the jetty's ContextHandler for this servletContext.
+     */
+    protected ContextHandler initContextHandler(ServletContext servletContext)
+    {
+        ContextHandler.Context scontext=ContextHandler.getCurrentContext();
+        if (scontext==null)
+        {
+            if (servletContext instanceof ContextHandler.Context)
+                return ((ContextHandler.Context)servletContext).getContextHandler();
+            else
+                throw new IllegalArgumentException("The servletContext " + servletContext + " " + 
+                    servletContext.getClass().getName() + " is not " + ContextHandler.Context.class.getName());
+        }
+        else
+            return ContextHandler.getCurrentContext().getContextHandler();
+    }
+
     /* ------------------------------------------------------------ */
     @Override
     public String getInitParameter(String name)