add rootMsgFolder accessor to incoming server, make rootFolder interCaps r/sr=sspitzer 119579

mailnews/base/public/nsIMsgIncomingServer.idl

@@ -40,6 +40,7 @@
 
 interface nsIFileSpec;
 interface nsIFolder;
+interface nsIMsgFolder;
 interface nsIMsgFolderCache;
 interface nsIMsgWindow;
 interface nsIMsgFilterList;
@@ -149,7 +150,10 @@ interface nsIMsgIncomingServer : nsISupports {
   readonly attribute string serverURI;
 
   /* the root folder for this server */
-  attribute nsIFolder RootFolder;
+  attribute nsIFolder rootFolder;
+
+  /* handy accessor when we want a msg folder */
+  readonly attribute nsIMsgFolder rootMsgFolder;
 
   /* are we already getting new Messages on the current server..
      This is used to help us prevent multiple get new msg commands from

mailnews/base/resources/content/mailWindowOverlay.js

@@ -419,8 +419,7 @@ function GetWindowMediator()
 function GetInboxFolder(server)
 {
     try {
-        var rootFolder = server.RootFolder;
-        var rootMsgFolder = rootFolder.QueryInterface(Components.interfaces.nsIMsgFolder);
+        var rootMsgFolder = server.rootMsgFolder;
 
         //now find Inbox
         var outNumFolders = new Object();
@@ -794,9 +793,7 @@ function getDestinationFolder(preselectedFolder, server)
     var isCreateSubfolders = preselectedFolder.canCreateSubfolders;
     if (!isCreateSubfolders)
     {
-        var tmpDestFolder = server.RootFolder;
-        destinationFolder
-          = tmpDestFolder.QueryInterface(Components.interfaces.nsIMsgFolder);
+        destinationFolder = server.rootMsgFolder;
 
         var verifyCreateSubfolders = null;
         if (destinationFolder)
@@ -809,9 +806,7 @@ function getDestinationFolder(preselectedFolder, server)
             try {
                 var account = accountManager.defaultAccount;
                 var defaultServer = account.incomingServer;
-                var tmpDefaultFolder = defaultServer.RootFolder;
-                var defaultFolder
-                  = tmpDefaultFolder.QueryInterface(Components.interfaces.nsIMsgFolder);
+                var defaultFolder = defaultServer.rootMsgFolder;
 
                 var checkCreateSubfolders = null;
                 if (defaultFolder)

mailnews/base/resources/content/msgMail3PaneWindow.js

@@ -370,7 +370,7 @@ function ServerContainsFolder(server, folder)
 
 function SelectServer(server)
 {
-  SelectFolder(server.RootFolder.URI);
+  SelectFolder(server.rootFolder.URI);
 }
 
 // we have this incoming server listener in case we need to
@@ -520,8 +520,7 @@ function loadStartFolder(initialUri)
             var defaultAccount = accountManager.defaultAccount;
 
             defaultServer = defaultAccount.incomingServer;
-            var rootFolder = defaultServer.RootFolder;
-            var rootMsgFolder = rootFolder.QueryInterface(Components.interfaces.nsIMsgFolder);
+            var rootMsgFolder = defaultServer.rootMsgFolder;
 
             startFolderResource = rootMsgFolder.QueryInterface(Components.interfaces.nsIRDFResource);
 

mailnews/base/util/nsMsgIncomingServer.cpp

@@ -158,6 +158,18 @@ nsMsgIncomingServer::GetRootFolder(nsIFolder * *aRootFolder)
 	return NS_OK;
 }
 
+NS_IMETHODIMP
+nsMsgIncomingServer::GetRootMsgFolder(nsIMsgFolder **aRootMsgFolder)
+{
+  NS_ENSURE_ARG_POINTER(aRootMsgFolder);
+  nsCOMPtr <nsIFolder> rootFolder;
+  nsresult rv = GetRootFolder(getter_AddRefs(rootFolder));
+  if (NS_SUCCEEDED(rv) && rootFolder)
+    rv = rootFolder->QueryInterface(NS_GET_IID(nsIMsgFolder), (void **) aRootMsgFolder);
+
+  return rv;
+}
+
 NS_IMETHODIMP
 nsMsgIncomingServer::PerformExpand(nsIMsgWindow *aMsgWindow)
 {
@@ -989,10 +1001,8 @@ nsMsgIncomingServer::GetFilterList(nsIMsgFilterList **aResult)
   nsresult rv;
   
   if (!mFilterList) {
-      nsCOMPtr<nsIFolder> folder;
-      rv = GetRootFolder(getter_AddRefs(folder));
-
-      nsCOMPtr<nsIMsgFolder> msgFolder(do_QueryInterface(folder, &rv));
+      nsCOMPtr<nsIMsgFolder> msgFolder;
+      rv = GetRootMsgFolder(getter_AddRefs(msgFolder));
       NS_ENSURE_SUCCESS(rv, rv);
       
       nsCOMPtr<nsIFileSpec> thisFolder;