[banshee] Lastfm: refactor to optimize the check for queue's emptiness by using Linq

[Andrés Aragoneses <aaragoneses src gnome org>]

commit 5d46d00113bd9ab0d754b6ec761bb3d9117571b9
Author: Andres G. Aragoneses <knocte gmail com>
Date:   Sat Mar 16 21:52:00 2013 +0000

    Lastfm: refactor to optimize the check for queue's emptiness by using Linq
    
    No change of behaviour in this commit.

 .../Banshee.Lastfm.Audioscrobbler/Queue.cs         |   14 ++++++++++++++
 src/Libraries/Lastfm/Lastfm.csproj                 |    1 +
 .../Lastfm/Lastfm/AudioscrobblerConnection.cs      |    5 +++--
 src/Libraries/Lastfm/Lastfm/IQueue.cs              |    2 +-
 4 files changed, 19 insertions(+), 3 deletions(-)
---
diff --git a/src/Extensions/Banshee.Lastfm/Banshee.Lastfm.Audioscrobbler/Queue.cs 
b/src/Extensions/Banshee.Lastfm/Banshee.Lastfm.Audioscrobbler/Queue.cs
index fe1972d..5a41071 100644
--- a/src/Extensions/Banshee.Lastfm/Banshee.Lastfm.Audioscrobbler/Queue.cs
+++ b/src/Extensions/Banshee.Lastfm/Banshee.Lastfm.Audioscrobbler/Queue.cs
@@ -164,6 +164,20 @@ namespace Banshee.Lastfm.Audioscrobbler
             Load ();
         }
 
+        #region IEnumerable implementation
+
+        IEnumerator<IQueuedTrack> IEnumerable<IQueuedTrack>.GetEnumerator ()
+        {
+            return queue.GetEnumerator ();
+        }
+
+        System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator ()
+        {
+            return queue.GetEnumerator ();
+        }
+
+        #endregion
+
         private void MigrateQueueFile ()
         {
             string old_xml_dir_path = Path.Combine (Hyena.Paths.ExtensionCacheRoot, "last.fm");
diff --git a/src/Libraries/Lastfm/Lastfm.csproj b/src/Libraries/Lastfm/Lastfm.csproj
index 25cb353..5e1d8f9 100644
--- a/src/Libraries/Lastfm/Lastfm.csproj
+++ b/src/Libraries/Lastfm/Lastfm.csproj
@@ -50,6 +50,7 @@
     <Reference Include="ICSharpCode.SharpZipLib">
       <HintPath>..\..\..\bin\bin\ICSharpCode.SharpZipLib.dll</HintPath>
     </Reference>
+    <Reference Include="System.Core" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\Mono.Media\Mono.Media.csproj">
diff --git a/src/Libraries/Lastfm/Lastfm/AudioscrobblerConnection.cs 
b/src/Libraries/Lastfm/Lastfm/AudioscrobblerConnection.cs
index 3e685a6..230199c 100644
--- a/src/Libraries/Lastfm/Lastfm/AudioscrobblerConnection.cs
+++ b/src/Libraries/Lastfm/Lastfm/AudioscrobblerConnection.cs
@@ -33,6 +33,7 @@
 
 using System;
 using System.Collections.Generic;
+using System.Linq;
 using System.IO;
 using System.Net;
 using System.Text;
@@ -168,7 +169,7 @@ namespace Lastfm
             // and address changes in our engine state
             switch (state) {
             case State.Idle:
-                if (queue.Count > 0) {
+                if (queue.Any ()) {
                     state = State.NeedTransmit;
                 } else if (current_now_playing_request != null) {
                     // Now playing info needs to be sent
@@ -322,7 +323,7 @@ namespace Lastfm
             }
 
             // if there are still valid tracks in the queue then retransmit on the next interval
-            state = queue.Count > 0 ? State.NeedTransmit : State.Idle;
+            state = queue.Any () ? State.NeedTransmit : State.Idle;
         }
 
         private void LogIfIgnored (JsonObject scrobbled_track)
diff --git a/src/Libraries/Lastfm/Lastfm/IQueue.cs b/src/Libraries/Lastfm/Lastfm/IQueue.cs
index 6eb4015..4548a5c 100644
--- a/src/Libraries/Lastfm/Lastfm/IQueue.cs
+++ b/src/Libraries/Lastfm/Lastfm/IQueue.cs
@@ -45,7 +45,7 @@ namespace Lastfm
         string TrackAuth { get; }
     }
 
-    public interface IQueue
+    public interface IQueue : IEnumerable<IQueuedTrack>
     {
         event EventHandler TrackAdded;