Refactor XDocServlet: Move project check into helper method

Change-Id: I0600b5aa3ea2459e3a57277ede2a3b6e17b1459e
Signed-off-by: Edwin Kempin <edwin.kempin@sap.com>

src/main/java/com/googlesource/gerrit/plugins/xdocs/XDocServlet.java

diff --git a/src/main/java/com/googlesource/gerrit/plugins/xdocs/XDocServlet.java b/src/main/java/com/googlesource/gerrit/plugins/xdocs/XDocServlet.java
index 40ce348..0bf2747 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/xdocs/XDocServlet.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/xdocs/XDocServlet.java
@@ -111,12 +111,9 @@
       validateRequestMethod(req);
 
       ResourceKey key = ResourceKey.fromPath(req.getPathInfo());
-      ProjectState state = projectCache.get(key.project);
-      if (state == null) {
-        Resource.NOT_FOUND.send(req, res);
-        return;
-      }
+      ProjectState state = getProject(key);
       XDocProjectConfig cfg = cfgFactory.create(state);
+
       if (key.file == null) {
         res.sendRedirect(getRedirectUrl(req, key, cfg));
         return;
@@ -257,6 +254,15 @@
     }
   }
 
+  private ProjectState getProject(ResourceKey key)
+      throws ResourceNotFoundException {
+    ProjectState state = projectCache.get(key.project);
+    if (state == null) {
+      throw new ResourceNotFoundException();
+    }
+    return state;
+  }
+
   private boolean isSafeImage(MimeType mimeType) {
     return isImage(mimeType) && fileTypeRegistry.isSafeInline(mimeType);
   }