[tomboy] [sync] Add ISyncServer.UpatesAvailableSince method

[Sanford Armstrong <sharm src gnome org>]

commit 82e91fb566b793b570d5c45c9048e13063323abc
Author: Sandy Armstrong <sanfordarmstrong gmail com>
Date:   Mon Feb 8 11:38:42 2010 -0800

    [sync] Add ISyncServer.UpatesAvailableSince method

 Tomboy/Addins/WebSyncService/WebSyncServer.cs  |   13 ++++++++++---
 Tomboy/Synchronization/FileSystemSyncServer.cs |    5 +++++
 Tomboy/Synchronization/SyncManager.cs          |    3 ++-
 3 files changed, 17 insertions(+), 4 deletions(-)
---
diff --git a/Tomboy/Addins/WebSyncService/WebSyncServer.cs b/Tomboy/Addins/WebSyncService/WebSyncServer.cs
index 6884ec5..285c16a 100644
--- a/Tomboy/Addins/WebSyncService/WebSyncServer.cs
+++ b/Tomboy/Addins/WebSyncService/WebSyncServer.cs
@@ -34,7 +34,7 @@ namespace Tomboy.WebSync
 {
 	public class WebSyncServer : SyncServer
 	{
-		private string serverUrl;
+		private string rootUri;
 		private IWebConnection connection;
 
 		private RootInfo root;
@@ -43,8 +43,8 @@ namespace Tomboy.WebSync
 		
 		public WebSyncServer (string serverUrl, IWebConnection connection)
 		{
-			this.serverUrl = serverUrl;
 			this.connection = connection;
+			rootUri = serverUrl + "/api/1.0/"; // TODO: Trim trailing / from serverUrl if necessary
 		}
 
 		#region SyncServer implementation
@@ -52,7 +52,6 @@ namespace Tomboy.WebSync
 		public bool BeginSyncTransaction ()
 		{
 			// TODO: Check connection and auth (is getting root/user resources a sufficient check?)
-			string rootUri = serverUrl + "/api/1.0/";
 			root = RootInfo.GetRoot (rootUri, connection);
 			user = UserInfo.GetUser (root.User.ApiRef, connection);
 			if (user.LatestSyncRevision.HasValue)
@@ -141,6 +140,14 @@ namespace Tomboy.WebSync
 			foreach (Note note in notes)
 				pendingCommits.Add (NoteConvert.ToNoteInfo (note));
 		}
+
+		public bool UpdatesAvailableSince (int revision)
+		{
+			root = RootInfo.GetRoot (rootUri, connection);
+			user = UserInfo.GetUser (root.User.ApiRef, connection);
+			return user.LatestSyncRevision.HasValue &&
+				user.LatestSyncRevision.Value > revision;
+		}
 		
 		#endregion
 
diff --git a/Tomboy/Synchronization/FileSystemSyncServer.cs b/Tomboy/Synchronization/FileSystemSyncServer.cs
index 5cd5315..9aa29cb 100644
--- a/Tomboy/Synchronization/FileSystemSyncServer.cs
+++ b/Tomboy/Synchronization/FileSystemSyncServer.cs
@@ -96,6 +96,11 @@ namespace Tomboy.Sync
 			return noteUUIDs;
 		}
 
+		public bool UpdatesAvailableSince (int revision)
+		{
+			return LatestRevision > revision; // TODO: Mounting, etc?
+		}
+
 		public virtual IDictionary<string, NoteUpdate> GetNoteUpdatesSince (int revision)
 		{
 			Dictionary<string, NoteUpdate> noteUpdates = new Dictionary<string, NoteUpdate> ();
diff --git a/Tomboy/Synchronization/SyncManager.cs b/Tomboy/Synchronization/SyncManager.cs
index 0b1551a..00f5577 100644
--- a/Tomboy/Synchronization/SyncManager.cs
+++ b/Tomboy/Synchronization/SyncManager.cs
@@ -851,9 +851,10 @@ namespace Tomboy.Sync
 		IDictionary<string, NoteUpdate> GetNoteUpdatesSince (int revision);
 		void DeleteNotes (IList<string> deletedNoteUUIDs);
 		void UploadNotes (IList<Note> notes);
-		int LatestRevision { get; }
+		int LatestRevision { get; } // NOTE: Only reliable during a transaction
 		SyncLockInfo CurrentSyncLock { get; }
 		string Id { get; }
+		bool UpdatesAvailableSince (int revision);
 	}
 
 	public interface SyncClient