Merge pull request #3 from glucaci/mpdResponse

Mpd response refactored

LibMpc/Commands/Commands.Database.cs

@@ -1,4 +1,5 @@
-using System;
+using System.Collections.Generic;
+using System.Linq;
 
 namespace LibMpc
 {
@@ -10,8 +11,8 @@ namespace LibMpc
         public class Database
         {
             // TODO: count
-
-            public class Find : IMpcCommand
+            
+            public class Find : IMpcCommand<IList<IDictionary<string, string>>>
             {
                 private readonly ITag _tag;
                 private readonly string _searchText;
@@ -24,13 +25,30 @@ namespace LibMpc
 
                 public string Value => string.Join(" ", "find", _tag.Value, _searchText);
 
-                public object ParseResponse(object response)
+                public IDictionary<string, IList<IDictionary<string, string>>> FormatResponse(IList<KeyValuePair<string, string>> response)
                 {
-                    throw new NotImplementedException();
+                    var results = new Dictionary<string, IList<IDictionary<string, string>>>
+                    {
+                        { "files", new List<IDictionary<string, string>>() }
+                    };
+
+                    foreach (var line in response)
+                    {
+                        if (line.Key.Equals("file"))
+                        {
+                            results["files"].Add(new Dictionary<string, string> { { "file", line.Value } });
+                        }
+                        else
+                        {
+                            results["files"].Last().Add(line.Key, line.Value);
+                        }
+                    }
+
+                    return results;
                 }
             }
 
-            public class List : IMpcCommand
+            public class List : IMpcCommand<string>
             {
                 private readonly ITag _tag;
 
@@ -41,15 +59,15 @@ namespace LibMpc
 
                 public string Value => string.Join(" ", "list", _tag);
 
-                public object ParseResponse(object response)
+                public IDictionary<string, string> FormatResponse(IList<KeyValuePair<string, string>> response)
                 {
-                    throw new NotImplementedException();
+                    return response.ToDefaultDictionary();
                 }
             }
 
             // TODO: findadd
 
-            public class ListAll : IMpcCommand
+            public class ListAll : IMpcCommand<string>
             {
                 private readonly string _path;
 
@@ -60,9 +78,9 @@ namespace LibMpc
 
                 public string Value => string.Join(" ", "listall", _path);
 
-                public object ParseResponse(object response)
+                public IDictionary<string, string> FormatResponse(IList<KeyValuePair<string, string>> response)
                 {
-                    throw new NotImplementedException();
+                    return response.ToDefaultDictionary();
                 }
             }
 
@@ -74,16 +92,17 @@ namespace LibMpc
             // TODO: searchadd
             // TODO: searchaddpl
 
-            public class Update : IMpcCommand
+            public class Update : IMpcCommand<string>
             {
+                // TODO: Extend command: < update [URI] >
                 public string Value => "update";
 
-                public object ParseResponse(object response)
+                public IDictionary<string, string> FormatResponse(IList<KeyValuePair<string, string>> response)
                 {
-                    throw new NotImplementedException();
+                    return response.ToDefaultDictionary();
                 }
             }
-
+            
             // TODO: rescan
         }
     }

LibMpc/Commands/Commands.Output.cs

@@ -1,4 +1,6 @@
-namespace LibMpc
+using System.Collections.Generic;
+
+namespace LibMpc
 {
     public partial class Commands
     {
@@ -10,7 +12,7 @@
             /// <summary>
             /// Turns an output off.
             /// </summary>
-            public class DisableOutput : IMpcCommand
+            public class DisableOutput : IMpcCommand<string>
             {
                 private readonly int _outputId;
 
@@ -21,16 +23,16 @@
 
                 public string Value => string.Join(" ", "disableoutput", _outputId);
 
-                public object ParseResponse(object response)
+                public IDictionary<string, string> FormatResponse(IList<KeyValuePair<string, string>> response)
                 {
-                    throw new System.NotImplementedException();
+                    return response.ToDefaultDictionary();
                 }
             }
 
             /// <summary>
             /// Turns an output on.
             /// </summary>
-            public class EnableOutput : IMpcCommand
+            public class EnableOutput : IMpcCommand<string>
             {
                 private readonly int _outputId;
 
@@ -41,9 +43,9 @@
 
                 public string Value => string.Join(" ", "enableoutput", _outputId);
 
-                public object ParseResponse(object response)
+                public IDictionary<string, string> FormatResponse(IList<KeyValuePair<string, string>> response)
                 {
-                    throw new System.NotImplementedException();
+                    return response.ToDefaultDictionary();
                 }
             }
 
@@ -52,13 +54,32 @@
             /// <summary>
             /// Shows information about all outputs.
             /// </summary>
-            public class Outputs : IMpcCommand
+            public class Outputs : IMpcCommand<IList<IDictionary<string, string>>>
             {
                 public string Value => "outputs";
-
-                public object ParseResponse(object response)
+                
+                public IDictionary<string, IList<IDictionary<string, string>>> FormatResponse(IList<KeyValuePair<string, string>> response)
                 {
-                    throw new System.NotImplementedException();
+                    var result = new Dictionary<string, IList<IDictionary<string, string>>>
+                    {
+                        { "outputs", new List<IDictionary<string, string>>() }
+                    };
+
+                    for (var i = 0; i < response.Count; i += 3)
+                    {
+                        var outputId = response[i].Value;
+                        var outputName = response[i + 1].Value;
+                        var outputEnabled = response[i + 2].Value;
+
+                        result["outputs"].Add(new Dictionary<string, string>
+                        {
+                            {"id", outputId},
+                            {"name", outputName},
+                            {"enabled", outputEnabled}
+                        });
+                    }
+
+                    return result;
                 }
             }
         }

LibMpc/Commands/Commands.Reflection.cs

@@ -1,4 +1,7 @@
-namespace LibMpc
+using System.Collections.Generic;
+using System.Linq;
+
+namespace LibMpc
 {
     public partial class Commands
     {
@@ -11,13 +14,18 @@
             // TODO: commands
             // TODO: notcommands
 
-            public class TagTypes : IMpcCommand
+            public class TagTypes : IMpcCommand<IList<string>>
             {
                 public string Value => "tagtypes";
 
-                public object ParseResponse(object response)
+                IDictionary<string, IList<string>> IMpcCommand<IList<string>>.FormatResponse(IList<KeyValuePair<string, string>> response)
                 {
-                    throw new System.NotImplementedException();
+                    var result = new Dictionary<string, IList<string>>
+                    {
+                        { "tagtypes", response.Where(item => item.Key.Equals("tagtype")).Select(item => item.Value).ToList() }
+                    };
+
+                    return result;
                 }
             }
 

LibMpc/Commands/IMpcCommand.cs

@@ -1,10 +1,20 @@
+using System.Collections.Generic;
+using System.Linq;
+
 namespace LibMpc
 {
-    public interface IMpcCommand
+    public interface IMpcCommand<T>
     {
         string Value { get; }
 
-        // TODO: Return IMpdResponse and create type-safe input.
-        object ParseResponse(object response);
+        IDictionary<string, T> FormatResponse(IList<KeyValuePair<string, string>> response);
+    }
+
+    internal static class MpdCommandExtensions
+    {
+        public static IDictionary<string, string> ToDefaultDictionary(this IList<KeyValuePair<string, string>> items)
+        {
+            return items.ToDictionary(item => item.Key, item => item.Value);
+        }
     }
 }

LibMpc/Constants.cs

@@ -0,0 +1,13 @@
+using System.Collections.Generic;
+using System.Threading.Tasks;
+
+namespace LibMpc
+{
+    public class Constants
+    {
+        public static readonly string Ok = "OK";
+        public static readonly string Ack = "ACK";
+
+        public static readonly string FirstLinePrefix = "OK MPD ";
+    }
+}

LibMpc/Message/MpdMessage.cs

@@ -0,0 +1,62 @@
+using System.Collections.Generic;
+using System.Linq;
+using System.Text.RegularExpressions;
+using Newtonsoft.Json;
+
+namespace LibMpc
+{
+    public interface IMpdMessage<T>
+    {
+        IMpdRequest<T> Request { get; }
+        IMpdResponse<T> Response { get; }
+    }
+
+    public class MpdMessage<T> : IMpdMessage<T>
+    {
+        private readonly Regex _linePattern = new Regex("^(?<key>[A-Za-z_]*):[ ]{0,1}(?<value>.*)$");
+        private readonly IList<string> _rawResponse;
+
+        public MpdMessage(IMpcCommand<T> command, bool connected, IReadOnlyCollection<string> response)
+        {
+            Request = new MpdRequest<T>(command);
+
+            var endLine = response.Skip(response.Count - 1).Single();
+            _rawResponse = response.Take(response.Count - 1).ToList();
+
+            var values = Request.Command.FormatResponse(GetValuesFromResponse());
+            Response = new MpdResponse<T>(endLine, values, connected);
+        }
+
+        public IMpdRequest<T> Request { get; }
+        public IMpdResponse<T> Response { get; }
+
+        private IList<KeyValuePair<string, string>> GetValuesFromResponse()
+        {
+            var result = new List<KeyValuePair<string, string>>();
+
+            foreach (var line in _rawResponse)
+            {
+                var match = _linePattern.Match(line);
+                if (match.Success)
+                {
+                    var mpdKey = match.Result("${key}");
+                    if (!string.IsNullOrEmpty(mpdKey))
+                    {
+                        var mpdValue = match.Result("${value}");
+                        if (!string.IsNullOrEmpty(mpdValue))
+                        {
+                            result.Add(new KeyValuePair<string, string>(mpdKey, mpdValue));
+                        }
+                    }
+                }
+            }
+
+            return result;
+        }
+
+        public override string ToString()
+        {
+            return JsonConvert.SerializeObject(this, Formatting.Indented);
+        }
+    }
+}

LibMpc/Message/MpdRequest.cs

@@ -0,0 +1,17 @@
+namespace LibMpc
+{
+    public interface IMpdRequest<T>
+    {
+        IMpcCommand<T> Command { get; }
+    }
+
+    public class MpdRequest<T> : IMpdRequest<T>
+    {
+        public MpdRequest(IMpcCommand<T> command)
+        {
+            Command = command;
+        }
+
+        public IMpcCommand<T> Command { get; }
+    }
+}

LibMpc/Message/MpdResponse.cs

@@ -0,0 +1,34 @@
+using System;
+using System.Collections.Generic;
+
+namespace LibMpc
+{
+    public interface IMpdResponse<T>
+    {
+        IMpdResponseState State { get; }
+        IDictionary<string, T> Body { get; }
+    }
+
+    public class MpdResponse<T> : IMpdResponse<T>
+    {
+        public MpdResponse(string endLine, IDictionary<string, T> body, bool connected)
+        {
+            State = new MpdResponseState(endLine, connected);
+            Body = body;
+        }
+
+        public IMpdResponseState State { get; }
+        public IDictionary<string, T> Body { get; }
+    }
+
+    public static class CheckNotNullExtension
+    {
+        public static void CheckNotNull(this object toBeChecked)
+        {
+            if (toBeChecked == null)
+            {
+                throw new ArgumentNullException(nameof(toBeChecked));
+            }
+        }
+    }
+}

LibMpc/Message/MpdResponseState.cs

@@ -0,0 +1,66 @@
+using System.Text.RegularExpressions;
+
+namespace LibMpc
+{
+    public interface IMpdResponseState
+    {
+        string Status { get; }
+        string ErrorMessage { get; }
+        string MpdError { get; }
+        bool Error { get; }
+        bool Connected { get; }
+    }
+
+    public class MpdResponseState : IMpdResponseState
+    {
+        private static readonly Regex ErrorPattern = new Regex("^ACK \\[(?<code>[0-9]*)@(?<nr>[0-9]*)] \\{(?<command>[a-z]*)} (?<message>.*)$");
+
+        private readonly string _endLine;
+
+        public MpdResponseState(string endLine, bool connected)
+        {
+            _endLine = endLine;
+            Connected = connected;
+
+            if (!string.IsNullOrEmpty(_endLine))
+            {
+                if (_endLine.Equals(Constants.Ok))
+                {
+                    Status = _endLine;
+                    Error = false;
+                }
+                else
+                {
+                    ParseErrorResponse();
+                }
+            }
+        }
+
+        public bool Connected { get; } = false;
+        public bool Error { get; } = true;
+        public string Status { get; private set; } = "UNKNOWN";
+        public string ErrorMessage { get; private set; } = string.Empty;
+        public string MpdError { get; private set; } = string.Empty;
+
+        private void ParseErrorResponse()
+        {
+            Status = "ERROR";
+            MpdError = _endLine;
+
+            var match = ErrorPattern.Match(_endLine);
+
+            if (match.Groups.Count != 5)
+            {
+                ErrorMessage = "Unexpected response from server.";
+            }
+            else
+            {
+                var errorCode = match.Result("${code}");
+                var commandListItem = match.Result("${nr}");
+                var commandFailed = match.Result("${command}");
+                var errorMessage = match.Result("${message}");
+                ErrorMessage = $"ErrorCode: { errorCode }, CommandListItem: { commandListItem }, CommandFailed: { commandFailed }, ErrorMessage: { errorMessage }";
+            }
+        }
+    }
+}

LibMpc/Mpc.cs

@@ -52,148 +52,16 @@ namespace LibMpc
             }
         }
 
-        // TODO: create response type
-        public async Task<object> SendAsync(IMpcCommand command)
+        public async Task<IMpdMessage<T>> SendAsync<T>(IMpcCommand<T> command)
         {
-            var mpdResponse = await _connection.Exec(command.Value);
-            var respose = command.ParseResponse(mpdResponse);
+            var mpdMessage = await _connection.SendAsync(command);
 
-            return respose;
+            return mpdMessage;
         }
-
-
-        #region Admin Commands
-        /// <summary>
-        /// Disables an MPD output.
-        /// </summary>
-        /// <param name="id">The id of the output.</param>
-        /// <returns>If the action was successful.</returns>
-        public async Task<bool> DisableOutputAsync(int id)
-        {
-            var mpdResponse = await _connection.Exec("disableoutput", new string[] { id.ToString() });
-            return !mpdResponse.IsError;
-        }
-
-        /// <summary>
-        /// Enables an MPD output.
-        /// </summary>
-        /// <param name="id">The id of the output.</param>
-        /// <returns>If the action was successful.</returns>
-        public async Task<bool> EnableOutputAsync(int id)
-        {
-            var mpdResponse = await _connection.Exec("enableoutput", new string[] { id.ToString() });
-            return !mpdResponse.IsError;
-        }
-
-        /// <summary>
-        /// Lists all outputs of the MPD.
-        /// </summary>
-        /// <returns>The list of all MPD outputs.</returns>
-        public async Task<MpdOutput[]> OutputsAsync()
-        {
-            MpdResponse response = await _connection.Exec("outputs");
-            if (response.Message.Count % 3 != 0)
-                throw new InvalidMpdResponseException();
-
-            MpdOutput[] ret = new MpdOutput[response.Message.Count / 3];
-
-            for (int i = 0; i < ret.Length; i++)
-            {
-                int id;
-                string name;
-                int enabled;
-
-                KeyValuePair<string, string> idLine = response[i * 3];
-                if (idLine.Key == null)
-                    throw new InvalidMpdResponseException("Invalid form of line " + (i * 3));
-                if (!idLine.Key.Equals("outputid"))
-                    throw new InvalidMpdResponseException("Key of line " + (i * 3) + " is not 'outputid'");
-                if (!int.TryParse(idLine.Value, out id))
-                    throw new InvalidMpdResponseException("Value of line " + (i * 3) + " is not a number");
-
-                KeyValuePair<string, string> nameLine = response[i * 3 + 1];
-                if (nameLine.Key == null)
-                    throw new InvalidMpdResponseException("Invalid form of line " + (i * 3 + 1));
-                if (!nameLine.Key.Equals("outputname"))
-                    throw new InvalidMpdResponseException("Key of line " + (i * 3 + 1) + " is not 'outputname'");
-                name = nameLine.Value;
-
-                KeyValuePair<string, string> enabledLine = response[i * 3 + 2];
-                if (enabledLine.Key == null)
-                    throw new InvalidMpdResponseException("Invalid form of line " + (i * 3 + 2));
-                if (!enabledLine.Key.Equals("outputenabled"))
-                    throw new InvalidMpdResponseException("Key of line " + (i * 3 + 2) + " is not 'outputenabled'");
-                if (!int.TryParse(enabledLine.Value, out enabled))
-                    throw new InvalidMpdResponseException("Value of line " + (i * 3 + 2) + " is not a number");
-
-                ret[i] = new MpdOutput(id, name, enabled > 0);
-            }
-
-            return ret;
-        }
-        /// <summary>
-        /// Returns the list of tag types the MPD supports.
-        /// </summary>
-        /// <returns>The list of tag types the MPD supports.</returns>
-        public async Task<string[]> TagTypesAsync()
-        {
-            MpdResponse response = await _connection.Exec("tagtypes");
-
-            string[] ret = new string[response.Message.Count];
-
-            for (int i = 0; i < ret.Length; i++)
-            {
-                KeyValuePair<string, string> line = response[i];
-                if (!line.Key.Equals("tagtype"))
-                    throw new InvalidMpdResponseException("Key of line " + (i) + " is not 'tagtype'");
-                ret[i] = line.Value;
-            }
-
-            return ret;
-        }
-        /// <summary>
-        /// Starts an update of the MPD database.
-        /// </summary>
-        /// <returns>An sequential number of the update process.</returns>
-        public async Task<int> UpdateAsync()
-        {
-            MpdResponse response = await _connection.Exec("update");
-
-            if (response.Message.Count != 1)
-                throw new InvalidMpdResponseException("Respose message has more than one line.");
-
-            int ret;
-
-            KeyValuePair<string, string> line = response[0];
-            if (!line.Key.Equals("updating_db"))
-                throw new InvalidMpdResponseException("Key of line 0 is not 'updating_db'");
-            if (!int.TryParse(line.Value, out ret))
-                throw new InvalidMpdResponseException("Value of line 0 is not a number");
-
-            return ret;
-        }
-
-        #endregion
-
+        
+        /*
         #region Database Commands
-        /// <summary>
-        /// Returns all files in the database who's attribute matches the given token. Works like the Search command but is case sensitive.
-        /// </summary>
-        /// <param name="tag">Specifies the attribute to search for.</param>
-        /// <param name="token">The value the files attribute must have to be included in the result.</param>
-        /// <returns>All files in the database who's attribute matches the given token.</returns>
-        public async Task<List<MpdFile>> FindAsync(ITag tag, string token)
-        {
-            if (token == null)
-                throw new ArgumentNullException("token");
-
-            MpdResponse response = await _connection.Exec("find", new string[] { tag.Value, token });
-
-            if (response.IsError)
-                throw new MpdResponseException(response.ErrorCode, response.ErrorMessage);
-
-            return MpdFile.buildList(response);
-        }
+        
         /// <summary>
         /// Returns all values found in files of the MPD for the given attribute.
         /// </summary>
@@ -201,9 +69,9 @@ namespace LibMpc
         /// <returns>All values found in files of the MPD for the given attribute.</returns>
         public async Task<List<string>> ListAsync(ITag tag)
         {
-            MpdResponse response = await _connection.Exec("list", new string[] { tag.Value });
+            MpdResponse response = await _connection.SendAsync("list", new string[] { tag.Value });
 
-            if (response.IsError)
+            if (response.State.Error)
                 throw new MpdResponseException(response.ErrorCode, response.ErrorMessage);
 
             return response.getValueList();
@@ -220,9 +88,9 @@ namespace LibMpc
             if (searchValue == null)
                 throw new ArgumentNullException("searchValue");
 
-            MpdResponse response = await _connection.Exec("list", new string[] { resultTag.Value, searchTag.Value, searchValue });
+            MpdResponse response = await _connection.SendAsync("list", new string[] { resultTag.Value, searchTag.Value, searchValue });
 
-            if (response.IsError)
+            if (response.State.Error)
                 throw new MpdResponseException(response.ErrorCode, response.ErrorMessage);
 
             return response.getValueList();
@@ -237,9 +105,9 @@ namespace LibMpc
             if (path == null)
                 throw new ArgumentNullException("path");
 
-            MpdResponse response = await _connection.Exec("listall", new string[] { path });
+            MpdResponse response = await _connection.SendAsync("listall", new string[] { path });
 
-            if (response.IsError)
+            if (response.State.Error)
                 throw new MpdResponseException(response.ErrorCode, response.ErrorMessage);
 
             return response.getValueList();
@@ -254,9 +122,9 @@ namespace LibMpc
             if (path == null)
                 throw new ArgumentNullException("path");
 
-            MpdResponse response = await _connection.Exec("listallinfo", new string[] { path });
+            MpdResponse response = await _connection.SendAsync("listallinfo", new string[] { path });
 
-            if (response.IsError)
+            if (response.State.Error)
                 throw new MpdResponseException(response.ErrorCode, response.ErrorMessage);
 
             return MpdFile.buildList(response);
@@ -278,11 +146,11 @@ namespace LibMpc
         {
             MpdResponse response;
             if (path == null)
-                response = await _connection.Exec("lsinfo");
+                response = await _connection.SendAsync("lsinfo");
             else
-                response = await _connection.Exec("lsinfo", new string[] { path });
+                response = await _connection.SendAsync("lsinfo", new string[] { path });
 
-            if (response.IsError)
+            if (response.State.Error)
                 throw new MpdResponseException(response.ErrorCode, response.ErrorMessage);
 
             return new MpdDirectoryListing(
@@ -301,9 +169,9 @@ namespace LibMpc
             if (token == null)
                 throw new ArgumentNullException("token");
 
-            MpdResponse response = await _connection.Exec("search", new string[] { tag.Value, token });
+            MpdResponse response = await _connection.SendAsync("search", new string[] { tag.Value, token });
 
-            if (response.IsError)
+            if (response.State.Error)
                 throw new MpdResponseException(response.ErrorCode, response.ErrorMessage);
 
             return MpdFile.buildList(response);
@@ -321,7 +189,7 @@ namespace LibMpc
             if (filename == null)
                 throw new ArgumentNullException("filename");
 
-            MpdResponse response = await _connection.Exec("add", new string[] { filename });
+            MpdResponse response = await _connection.SendAsync("add", new string[] { filename });
 
             if (response.IsError)
                 throw new MpdResponseException(response.ErrorCode, response.ErrorMessage);
@@ -336,7 +204,7 @@ namespace LibMpc
             if (filename == null)
                 throw new ArgumentNullException("filename");
 
-            MpdResponse response = await _connection.Exec("add", new string[] { filename });
+            MpdResponse response = await _connection.SendAsync("add", new string[] { filename });
 
             if (response.IsError)
                 throw new MpdResponseException(response.ErrorCode, response.ErrorMessage);
@@ -358,7 +226,7 @@ namespace LibMpc
         /// </summary>
         public async Task ClearAsync()
         {
-            MpdResponse response = await _connection.Exec("clear");
+            MpdResponse response = await _connection.SendAsync("clear");
 
             if (response.IsError)
                 throw new MpdResponseException(response.ErrorCode, response.ErrorMessage);
@@ -369,7 +237,7 @@ namespace LibMpc
         /// <returns>The information of the current song.</returns>
         public async Task<MpdFile> CurrentSongAsync()
         {
-            MpdResponse response = await _connection.Exec("currentsong");
+            MpdResponse response = await _connection.SendAsync("currentsong");
 
             if (response.IsError)
                 throw new MpdResponseException(response.ErrorCode, response.ErrorMessage);
@@ -382,7 +250,7 @@ namespace LibMpc
         /// <param name="nr">The index of the track to remove from the playlist.</param>
         public async Task DeleteAsync(int nr)
         {
-            MpdResponse response = await _connection.Exec("delete", new string[] { nr.ToString() });
+            MpdResponse response = await _connection.SendAsync("delete", new string[] { nr.ToString() });
 
             if (response.IsError)
                 throw new MpdResponseException(response.ErrorCode, response.ErrorMessage);
@@ -393,7 +261,7 @@ namespace LibMpc
         /// <param name="id">The id of the track to remove from the playlist.</param>
         public async Task DeleteIdAsync(int id)
         {
-            MpdResponse response = await _connection.Exec("deleteid", new string[] { id.ToString() });
+            MpdResponse response = await _connection.SendAsync("deleteid", new string[] { id.ToString() });
 
             if (response.IsError)
                 throw new MpdResponseException(response.ErrorCode, response.ErrorMessage);
@@ -407,7 +275,7 @@ namespace LibMpc
             if (name == null)
                 throw new ArgumentNullException("name");
 
-            MpdResponse response = await _connection.Exec("load", new string[] { name });
+            MpdResponse response = await _connection.SendAsync("load", new string[] { name });
 
             if (response.IsError)
                 throw new MpdResponseException(response.ErrorCode, response.ErrorMessage);
@@ -424,7 +292,7 @@ namespace LibMpc
             if (newName == null)
                 throw new ArgumentNullException("newName");
 
-            MpdResponse response = await _connection.Exec("rename", new string[] { oldName, newName });
+            MpdResponse response = await _connection.SendAsync("rename", new string[] { oldName, newName });
 
             if (response.IsError)
                 throw new MpdResponseException(response.ErrorCode, response.ErrorMessage);
@@ -436,7 +304,7 @@ namespace LibMpc
         /// <param name="newNr">The new index of the track in the playlist.</param>
         public async Task MoveAsync(int oldNr, int newNr)
         {
-            MpdResponse response = await _connection.Exec("move", new string[] { oldNr.ToString(), newNr.ToString() });
+            MpdResponse response = await _connection.SendAsync("move", new string[] { oldNr.ToString(), newNr.ToString() });
 
             if (response.IsError)
                 throw new MpdResponseException(response.ErrorCode, response.ErrorMessage);
@@ -448,7 +316,7 @@ namespace LibMpc
         /// <param name="nr">The new index of the track in the playlist.</param>
         public async Task MoveIdAsync(int id, int nr)
         {
-            MpdResponse response = await _connection.Exec("moveid", new string[] { id.ToString(), nr.ToString() });
+            MpdResponse response = await _connection.SendAsync("moveid", new string[] { id.ToString(), nr.ToString() });
 
             if (response.IsError)
                 throw new MpdResponseException(response.ErrorCode, response.ErrorMessage);
@@ -459,7 +327,7 @@ namespace LibMpc
         /// <returns>The meta data of the items in the current playlist.</returns>
         public async Task<List<MpdFile>> PlaylistInfoAsync()
         {
-            MpdResponse response = await _connection.Exec("playlistinfo");
+            MpdResponse response = await _connection.SendAsync("playlistinfo");
 
             if (response.IsError)
                 throw new MpdResponseException(response.ErrorCode, response.ErrorMessage);
@@ -473,7 +341,7 @@ namespace LibMpc
         /// <returns>The meta data of the track in the current playlist.</returns>
         public async Task<MpdFile> PlaylistInfoAsync(int nr)
         {
-            MpdResponse response = await _connection.Exec("playlistinfo", new string[] { nr.ToString() });
+            MpdResponse response = await _connection.SendAsync("playlistinfo", new string[] { nr.ToString() });
 
             if (response.IsError)
                 throw new MpdResponseException(response.ErrorCode, response.ErrorMessage);
@@ -486,7 +354,7 @@ namespace LibMpc
         /// <returns>The meta data of the items in the current playlist.</returns>
         public async Task<List<MpdFile>> PlaylistIdAsync()
         {
-            MpdResponse response = await _connection.Exec("playlistid");
+            MpdResponse response = await _connection.SendAsync("playlistid");
 
             if (response.IsError)
                 throw new MpdResponseException(response.ErrorCode, response.ErrorMessage);
@@ -500,7 +368,7 @@ namespace LibMpc
         /// <returns>The meta data of the track in the current playlist.</returns>
         public async Task<MpdFile> PlaylistIdAsync(int id)
         {
-            MpdResponse response = await _connection.Exec("playlistid", new string[] { id.ToString() });
+            MpdResponse response = await _connection.SendAsync("playlistid", new string[] { id.ToString() });
 
             if (response.IsError)
                 throw new MpdResponseException(response.ErrorCode, response.ErrorMessage);
@@ -514,7 +382,7 @@ namespace LibMpc
         /// <returns>All changed songs in the playlist since the given version.</returns>
         public async Task<List<MpdFile>> PlchangesAsync(int version)
         {
-            MpdResponse response = await _connection.Exec("plchanges", new string[] { version.ToString() });
+            MpdResponse response = await _connection.SendAsync("plchanges", new string[] { version.ToString() });
 
             if (response.IsError)
                 throw new MpdResponseException(response.ErrorCode, response.ErrorMessage);
@@ -531,7 +399,7 @@ namespace LibMpc
         /// </returns>
         public async Task<List<KeyValuePair<int, int>>> PlChangesPosIdAsync(int version)
         {
-            MpdResponse response = await _connection.Exec("plchangesposid", new string[] { version.ToString() });
+            MpdResponse response = await _connection.SendAsync("plchangesposid", new string[] { version.ToString() });
 
             if (response.IsError)
                 throw new MpdResponseException(response.ErrorCode, response.ErrorMessage);
@@ -578,7 +446,7 @@ namespace LibMpc
             if (name == null)
                 throw new ArgumentNullException("name");
 
-            MpdResponse response = await _connection.Exec("rm", new string[] { name });
+            MpdResponse response = await _connection.SendAsync("rm", new string[] { name });
 
             if (response.IsError)
                 throw new MpdResponseException(response.ErrorCode, response.ErrorMessage);
@@ -592,7 +460,7 @@ namespace LibMpc
             if (name == null)
                 throw new ArgumentNullException("name");
 
-            MpdResponse response = await _connection.Exec("save", new string[] { name });
+            MpdResponse response = await _connection.SendAsync("save", new string[] { name });
 
             if (response.IsError)
                 throw new MpdResponseException(response.ErrorCode, response.ErrorMessage);
@@ -602,7 +470,7 @@ namespace LibMpc
         /// </summary>
         public async Task ShuffleAsync()
         {
-            MpdResponse response = await _connection.Exec("shuffle");
+            MpdResponse response = await _connection.SendAsync("shuffle");
 
             if (response.IsError)
                 throw new MpdResponseException(response.ErrorCode, response.ErrorMessage);
@@ -614,7 +482,7 @@ namespace LibMpc
         /// <param name="nr2">The index of the second track.</param>
         public async Task SwapAsync(int nr1, int nr2)
         {
-            MpdResponse response = await _connection.Exec("swap", new string[] { nr1.ToString(), nr2.ToString() });
+            MpdResponse response = await _connection.SendAsync("swap", new string[] { nr1.ToString(), nr2.ToString() });
 
             if (response.IsError)
                 throw new MpdResponseException(response.ErrorCode, response.ErrorMessage);
@@ -626,7 +494,7 @@ namespace LibMpc
         /// <param name="id2">The id of the second track.</param>
         public async Task SwapIdAsync(int id1, int id2)
         {
-            MpdResponse response = await _connection.Exec("swapid", new string[] { id1.ToString(), id2.ToString() });
+            MpdResponse response = await _connection.SendAsync("swapid", new string[] { id1.ToString(), id2.ToString() });
 
             if (response.IsError)
                 throw new MpdResponseException(response.ErrorCode, response.ErrorMessage);
@@ -641,7 +509,7 @@ namespace LibMpc
             if (name == null)
                 throw new ArgumentNullException("name");
 
-            MpdResponse response = await _connection.Exec("listplaylist", new string[] { name });
+            MpdResponse response = await _connection.SendAsync("listplaylist", new string[] { name });
 
             if (response.IsError)
                 throw new MpdResponseException(response.ErrorCode, response.ErrorMessage);
@@ -658,7 +526,7 @@ namespace LibMpc
             if (name == null)
                 throw new ArgumentNullException("name");
 
-            MpdResponse response = await _connection.Exec("listplaylistinfo", new string[] { name });
+            MpdResponse response = await _connection.SendAsync("listplaylistinfo", new string[] { name });
 
             if (response.IsError)
                 throw new MpdResponseException(response.ErrorCode, response.ErrorMessage);
@@ -677,7 +545,7 @@ namespace LibMpc
             if (file == null)
                 throw new ArgumentNullException("file");
 
-            MpdResponse response = await _connection.Exec("playlistadd", new string[] { name, file });
+            MpdResponse response = await _connection.SendAsync("playlistadd", new string[] { name, file });
 
             if (response.IsError)
                 throw new MpdResponseException(response.ErrorCode, response.ErrorMessage);
@@ -691,7 +559,7 @@ namespace LibMpc
             if (name == null)
                 throw new ArgumentNullException("name");
 
-            MpdResponse response = await _connection.Exec("playlistclear", new string[] { name });
+            MpdResponse response = await _connection.SendAsync("playlistclear", new string[] { name });
 
             if (response.IsError)
                 throw new MpdResponseException(response.ErrorCode, response.ErrorMessage);
@@ -706,7 +574,7 @@ namespace LibMpc
             if (name == null)
                 throw new ArgumentNullException("name");
 
-            MpdResponse response = await _connection.Exec("playlistdelete", new string[] { name, id.ToString() });
+            MpdResponse response = await _connection.SendAsync("playlistdelete", new string[] { name, id.ToString() });
 
             if (response.IsError)
                 throw new MpdResponseException(response.ErrorCode, response.ErrorMessage);
@@ -722,7 +590,7 @@ namespace LibMpc
             if (name == null)
                 throw new ArgumentNullException("name");
 
-            MpdResponse response = await _connection.Exec("playlistmove", new string[] { id.ToString(), nr.ToString() });
+            MpdResponse response = await _connection.SendAsync("playlistmove", new string[] { id.ToString(), nr.ToString() });
 
             if (response.IsError)
                 throw new MpdResponseException(response.ErrorCode, response.ErrorMessage);
@@ -738,7 +606,7 @@ namespace LibMpc
             if (token == null)
                 throw new ArgumentNullException("token");
 
-            MpdResponse response = await _connection.Exec("playlistfind", new string[] { tag.Value, token });
+            MpdResponse response = await _connection.SendAsync("playlistfind", new string[] { tag.Value, token });
 
             if (response.IsError)
                 throw new MpdResponseException(response.ErrorCode, response.ErrorMessage);
@@ -756,7 +624,7 @@ namespace LibMpc
             if (token == null)
                 throw new ArgumentNullException("token");
 
-            MpdResponse response = await _connection.Exec("playlistsearch", new string[] { tag.Value, token });
+            MpdResponse response = await _connection.SendAsync("playlistsearch", new string[] { tag.Value, token });
 
             if (response.IsError)
                 throw new MpdResponseException(response.ErrorCode, response.ErrorMessage);
@@ -772,7 +640,7 @@ namespace LibMpc
         /// <param name="seconds">The seconds to crossfade between songs.</param>
         public async Task CrossfadeAsync(int seconds)
         {
-            MpdResponse response = await _connection.Exec("crossfade", new string[] { seconds.ToString() });
+            MpdResponse response = await _connection.SendAsync("crossfade", new string[] { seconds.ToString() });
 
             if (response.IsError)
                 throw new MpdResponseException(response.ErrorCode, response.ErrorMessage);
@@ -782,7 +650,7 @@ namespace LibMpc
         /// </summary>
         public async Task NextAsync()
         {
-            MpdResponse response = await _connection.Exec("next");
+            MpdResponse response = await _connection.SendAsync("next");
 
             if (response.IsError)
                 throw new MpdResponseException(response.ErrorCode, response.ErrorMessage);
@@ -793,7 +661,7 @@ namespace LibMpc
         /// <param name="pause">If the playback should be paused or resumed.</param>
         public async Task PauseAsync(bool pause)
         {
-            MpdResponse response = await _connection.Exec("pause", new string[] { pause ? "1" : "0" });
+            MpdResponse response = await _connection.SendAsync("pause", new string[] { pause ? "1" : "0" });
 
             if (response.IsError)
                 throw new MpdResponseException(response.ErrorCode, response.ErrorMessage);
@@ -803,7 +671,7 @@ namespace LibMpc
         /// </summary>
         public async Task PlayAsync()
         {
-            MpdResponse response = await _connection.Exec("play");
+            MpdResponse response = await _connection.SendAsync("play");
 
             if (response.IsError)
                 throw new MpdResponseException(response.ErrorCode, response.ErrorMessage);
@@ -814,7 +682,7 @@ namespace LibMpc
         /// <param name="nr">The index of the track in the playlist to start playing.</param>
         public async Task PlayAsync(int nr)
         {
-            MpdResponse response = await _connection.Exec("play", new string[] { nr.ToString() });
+            MpdResponse response = await _connection.SendAsync("play", new string[] { nr.ToString() });
 
             if (response.IsError)
                 throw new MpdResponseException(response.ErrorCode, response.ErrorMessage);
@@ -824,7 +692,7 @@ namespace LibMpc
         /// </summary>
         public async Task PlayIdAsync()
         {
-            MpdResponse response = await _connection.Exec("playid");
+            MpdResponse response = await _connection.SendAsync("playid");
 
             if (response.IsError)
                 throw new MpdResponseException(response.ErrorCode, response.ErrorMessage);
@@ -835,7 +703,7 @@ namespace LibMpc
         /// <param name="id">The id of the track to start playing.</param>
         public async Task PlayIdAsync(int id)
         {
-            MpdResponse response = await _connection.Exec("playid", new string[] { id.ToString() });
+            MpdResponse response = await _connection.SendAsync("playid", new string[] { id.ToString() });
 
             if (response.IsError)
                 throw new MpdResponseException(response.ErrorCode, response.ErrorMessage);
@@ -845,7 +713,7 @@ namespace LibMpc
         /// </summary>
         public async Task PreviousAsync()
         {
-            MpdResponse response = await _connection.Exec("previous");
+            MpdResponse response = await _connection.SendAsync("previous");
 
             if (response.IsError)
                 throw new MpdResponseException(response.ErrorCode, response.ErrorMessage);
@@ -856,7 +724,7 @@ namespace LibMpc
         /// <param name="random">If the MPD playlist should be played randomly.</param>
         public async Task RandomAsync(bool random)
         {
-            MpdResponse response = await _connection.Exec("random", new string[] { random ? "1" : "0" });
+            MpdResponse response = await _connection.SendAsync("random", new string[] { random ? "1" : "0" });
 
             if (response.IsError)
                 throw new MpdResponseException(response.ErrorCode, response.ErrorMessage);
@@ -867,7 +735,7 @@ namespace LibMpc
         /// <param name="repeat">If the MPD should repeat the playlist.</param>
         public async Task RepeatAsync(bool repeat)
         {
-            MpdResponse response = await _connection.Exec("repeat", new string[] { repeat ? "1" : "0" });
+            MpdResponse response = await _connection.SendAsync("repeat", new string[] { repeat ? "1" : "0" });
 
             if (response.IsError)
                 throw new MpdResponseException(response.ErrorCode, response.ErrorMessage);
@@ -879,7 +747,7 @@ namespace LibMpc
         /// <param name="time">The number of seconds to start playback on.</param>
         public async Task SeekAsync(int nr, int time)
         {
-            MpdResponse response = await _connection.Exec("seek", new string[] { nr.ToString(), time.ToString() });
+            MpdResponse response = await _connection.SendAsync("seek", new string[] { nr.ToString(), time.ToString() });
 
             if (response.IsError)
                 throw new MpdResponseException(response.ErrorCode, response.ErrorMessage);
@@ -891,7 +759,7 @@ namespace LibMpc
         /// <param name="time">The number of seconds to start playback on.</param>
         public async Task SeekIdAsync(int id, int time)
         {
-            MpdResponse response = await _connection.Exec("seekid", new string[] { id.ToString(), time.ToString() });
+            MpdResponse response = await _connection.SendAsync("seekid", new string[] { id.ToString(), time.ToString() });
 
             if (response.IsError)
                 throw new MpdResponseException(response.ErrorCode, response.ErrorMessage);
@@ -907,7 +775,7 @@ namespace LibMpc
             if (vol > 100)
                 throw new ArgumentException("vol > 100");
 
-            MpdResponse response = await _connection.Exec("setvol", new string[] { vol.ToString() });
+            MpdResponse response = await _connection.SendAsync("setvol", new string[] { vol.ToString() });
 
             if (response.IsError)
                 throw new MpdResponseException(response.ErrorCode, response.ErrorMessage);
@@ -917,7 +785,7 @@ namespace LibMpc
         /// </summary>
         public async Task StopAsync()
         {
-            MpdResponse response = await _connection.Exec("stop");
+            MpdResponse response = await _connection.SendAsync("stop");
 
             if (response.IsError)
                 throw new MpdResponseException(response.ErrorCode, response.ErrorMessage);
@@ -931,7 +799,7 @@ namespace LibMpc
         /// </summary>
         public async Task ClearErrorAsync()
         {
-            await _connection.Exec("clearerror");
+            await _connection.SendAsync("clearerror");
         }
         /// <summary>
         /// Returns which commands the current user has access to. 
@@ -939,7 +807,7 @@ namespace LibMpc
         /// <returns>The commands the current user has access to.</returns>
         public async Task<List<string>> CommandsAsync()
         {
-            MpdResponse response = await _connection.Exec("commands");
+            MpdResponse response = await _connection.SendAsync("commands");
 
             if (response.IsError)
                 throw new MpdResponseException(response.ErrorCode, response.ErrorMessage);
@@ -952,7 +820,7 @@ namespace LibMpc
         /// <returns>The commands the current user does has access to.</returns>
         public async Task<List<string>> NotCommandsAsync()
         {
-            MpdResponse response = await _connection.Exec("notcommands");
+            MpdResponse response = await _connection.SendAsync("notcommands");
 
             if (response.IsError)
                 throw new MpdResponseException(response.ErrorCode, response.ErrorMessage);
@@ -969,7 +837,7 @@ namespace LibMpc
             if (password == null)
                 throw new ArgumentNullException("password");
 
-            var mpdResponse = await _connection.Exec("password", new string[] { password });
+            var mpdResponse = await _connection.SendAsync("password", new string[] { password });
             return mpdResponse.IsError;
         }
         /// <summary>
@@ -977,7 +845,7 @@ namespace LibMpc
         /// </summary>
         public async Task PingAsync()
         {
-            await _connection.Exec("ping");
+            await _connection.SendAsync("ping");
         }
         /// <summary>
         /// Requests the current statistics from the MPD,
@@ -985,7 +853,7 @@ namespace LibMpc
         /// <returns>The current statistics fromt the MPD.</returns>
         public async Task<MpdStatistics> StatsAsync()
         {
-            MpdResponse response = await _connection.Exec("stats");
+            MpdResponse response = await _connection.SendAsync("stats");
 
             if (response.IsError)
                 throw new MpdResponseException(response.ErrorCode, response.ErrorMessage);
@@ -1063,7 +931,7 @@ namespace LibMpc
         /// <returns>The current status of the MPD.</returns>
         public async Task<MpdStatus> StatusAsync()
         {
-            MpdResponse response = await _connection.Exec("status");
+            MpdResponse response = await _connection.SendAsync("status");
 
             if (response.IsError)
                 throw new MpdResponseException(response.ErrorCode, response.ErrorMessage);
@@ -1233,5 +1101,6 @@ namespace LibMpc
         }
 
         #endregion
+        */
     }
 }

LibMpc/MpcConnection.cs

@@ -1,11 +1,9 @@
 using System;
 using System.Collections.Generic;
-using System.Collections.ObjectModel;
 using System.IO;
 using System.Net;
 using System.Net.Sockets;
 using System.Text;
-using System.Text.RegularExpressions;
 using System.Threading.Tasks;
 
 namespace LibMpc
@@ -17,12 +15,6 @@ namespace LibMpc
     /// </summary>
     public class MpcConnection
     {
-        private static readonly string FIRST_LINE_PREFIX = "OK MPD ";
-
-        private static readonly string OK = "OK";
-        private static readonly string ACK = "ACK";
-
-
         private readonly IPEndPoint _server;
 
         private TcpClient _tcpClient;
@@ -61,12 +53,12 @@ namespace LibMpc
             _writer = new StreamWriter(_networkStream, Encoding.UTF8) { NewLine = "\n" };
 
             var firstLine = _reader.ReadLine();
-            if (!firstLine.StartsWith(FIRST_LINE_PREFIX))
+            if (!firstLine.StartsWith(Constants.FirstLinePrefix))
             {
                 await DisconnectAsync();
-                throw new InvalidDataException("Response of mpd does not start with \"" + FIRST_LINE_PREFIX + "\"." );
+                throw new InvalidDataException("Response of mpd does not start with \"" + Constants.FirstLinePrefix + "\"." );
             }
-            _version = firstLine.Substring(FIRST_LINE_PREFIX.Length);
+            _version = firstLine.Substring(Constants.FirstLinePrefix.Length);
 
             await _writer.WriteLineAsync();
             _writer.Flush();
@@ -86,84 +78,29 @@ namespace LibMpc
 
             return Task.CompletedTask;
         }
-        /// <summary>
-        /// Executes a simple command without arguments on the MPD server and returns the response.
-        /// </summary>
-        /// <param name="command">The command to execute.</param>
-        /// <returns>The MPD server response parsed into a basic object.</returns>
-        /// <exception cref="ArgumentException">If the command contains a space of a newline charakter.</exception>
-        public async Task<MpdResponse> Exec(string command)
-        {
-            if (command == null)
-                throw new ArgumentNullException("command");
-            if (command.Contains(" "))
-                throw new ArgumentException("command contains space");
-            if (command.Contains("\n"))
-                throw new ArgumentException("command contains newline");
+        
 
-            // TODO: Integrate connection status in MpdResponse
-            var connectionResult = await CheckConnectionAsync();
+        public async Task<IMpdMessage<T>> SendAsync<T>(IMpcCommand<T> command)
+        {
+            command.CheckNotNull();
+
+            var connected = await CheckConnectionAsync();
+            string[] response;
 
             try
             {
-                _writer.WriteLine(command);
+                _writer.WriteLine(command.Value);
                 _writer.Flush();
 
-                return await ReadResponseAsync();
+                response = await ReadResponseAsync();
             }
             catch (Exception)
             {
                 try { await DisconnectAsync(); } catch (Exception) { }
                 return null; // TODO: Create Null Object for MpdResponse
             }
-        }
-        /// <summary>
-        /// Executes a MPD command with arguments on the MPD server.
-        /// </summary>
-        /// <param name="command">The command to execute.</param>
-        /// <param name="argument">The arguments of the command.</param>
-        /// <returns>The MPD server response parsed into a basic object.</returns>
-        /// <exception cref="ArgumentException">If the command contains a space of a newline charakter.</exception>
-        public async Task<MpdResponse> Exec(string command, string[] argument)
-        {
-            if (command == null)
-                throw new ArgumentNullException("command");
-            if (command.Contains(" "))
-                throw new ArgumentException("command contains space");
-            if (command.Contains("\n"))
-                throw new ArgumentException("command contains newline");
 
-            if (argument == null)
-                throw new ArgumentNullException("argument");
-            for (int i = 0; i < argument.Length; i++)
-            {
-                if (argument[i] == null)
-                    throw new ArgumentNullException("argument[" + i + "]");
-                if (argument[i].Contains("\n"))
-                    throw new ArgumentException("argument[" + i + "] contains newline");
-            }
-
-            // TODO: Integrate connection status in MpdResponse
-            var connectionResult = await CheckConnectionAsync();
-
-            try
-            {
-                _writer.Write(command);
-                foreach (string arg in argument)
-                {
-                    _writer.Write(' ');
-                    WriteToken(arg);
-                }
-                _writer.WriteLine();
-                _writer.Flush();
-
-                return await ReadResponseAsync();
-            }
-            catch (Exception)
-            {
-                try { await DisconnectAsync(); } catch (Exception) { }
-                throw;
-            }
+            return new MpdMessage<T>(command, connected, response);
         }
 
         private async Task<bool> CheckConnectionAsync()
@@ -176,41 +113,19 @@ namespace LibMpc
             return IsConnected;
         }
 
-        private void WriteToken(string token)
-        {
-            if (token.Contains(" "))
-            {
-                _writer.Write("\"");
-                foreach (char chr in token)
-                    if (chr == '"')
-                        _writer.Write("\\\"");
-                    else
-                        _writer.Write(chr);
-            }
-            else
-                _writer.Write(token);
-        }
-
-        private async Task<MpdResponse> ReadResponseAsync()
+        private async Task<string[]> ReadResponseAsync()
         {
             var response = new List<string>();
-            var currentLine = _reader.ReadLine();
 
             // Read response untli reach end token (OK or ACK)
-            while (!(currentLine.Equals(OK) || currentLine.StartsWith(ACK)))
+            string responseLine;
+            do
             {
-                response.Add(currentLine);
-                currentLine = await _reader.ReadLineAsync();
-            }
+                responseLine = await _reader.ReadLineAsync();
+                response.Add(responseLine);
+            } while (!(responseLine.Equals(Constants.Ok) || responseLine.StartsWith(Constants.Ack) || string.IsNullOrEmpty(responseLine)));
 
-            if (currentLine.Equals(OK))
-            {
-                return new MpdResponse(new ReadOnlyCollection<string>(response));
-            }
-            else
-            {
-                return AcknowledgeResponse.Parse(currentLine, response);
-            }
+            return response.ToArray();
         }
 
         private void ClearConnectionFields() 
@@ -222,24 +137,4 @@ namespace LibMpc
             _version = string.Empty;
         }
     }
-
-    public class AcknowledgeResponse
-    {
-        private static readonly Regex AcknowledgePattern = new Regex("^ACK \\[(?<code>[0-9]*)@(?<nr>[0-9]*)] \\{(?<command>[a-z]*)} (?<message>.*)$");
-
-        public static MpdResponse Parse(string acknowledgeResponse, IList<string> payload)
-        {
-            var match = AcknowledgePattern.Match(acknowledgeResponse);
-
-            if (match.Groups.Count != 5)
-                throw new InvalidDataException("Error response not as expected");
-
-            return new MpdResponse(
-                int.Parse(match.Result("${code}")),
-                int.Parse(match.Result("${nr}")),
-                match.Result("${command}"),
-                match.Result("${message}"),
-                new ReadOnlyCollection<string>(payload));
-        }
-    }
 }

LibMpc/MpdFile.cs

@@ -280,6 +280,7 @@ namespace LibMpc
             builder.Append(value);
             builder.AppendLine();
         }
+        /*
         /// <summary>
         /// Returns a MpdFile object from a MpdResponse object.
         /// </summary>
@@ -475,11 +476,12 @@ namespace LibMpc
                             break;
                         case TAG_TRACK:
                             track = line.Value;
-                            /*
+                            
+                            // TODO:
                             int tryTrack;
                             if (int.TryParse(line.Value, out tryTrack))
                                 track = tryTrack;
-                             */
+                             
                             break;
                         case TAG_NAME:
                             name = line.Value;
@@ -537,5 +539,6 @@ namespace LibMpc
 
             return ret;
         }
+        */
     }
 }

LibMpc/MpdResponse.cs

@@ -1,308 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Collections.ObjectModel;
-using System.Text;
-using System.Text.RegularExpressions;
-
-namespace LibMpc
-{
-    /// <summary>
-    /// The MpdResponse class parses the response to an MPD command in it's most
-    /// basic structure.
-    /// </summary>
-    public class MpdResponse : IEnumerable<KeyValuePair<string, string>>
-    {
-        private const string OK = "OK";
-        private const string ACK = "ACK";
-
-        private static readonly Regex LINE_REGEX = new Regex("^(?<key>[A-Za-z]*):[ ]{0,1}(?<value>.*)$");
-
-        private readonly bool isError;
-        private readonly int errorCode;
-        private readonly int commandListNum;
-        private readonly string currentCommand;
-        private readonly string errorMessage;
-        private readonly ReadOnlyCollection<string> message;
-
-        private Dictionary<string, string> dictionary = null;
-        /// <summary>
-        /// If the response denotes an error in the last command.
-        /// </summary>
-        public bool IsError { get { return this.isError; } }
-        /// <summary>
-        /// The error code if an error occured.
-        /// </summary>
-        public int ErrorCode { get { return this.errorCode; } }
-        /// <summary>
-        /// If an error occured the index of the invalid command in a command list.
-        /// </summary>
-        public int CommandListNum { get { return this.commandListNum; } }
-        /// <summary>
-        /// The command executed.
-        /// </summary>
-        public string CurrentCommand { get { return this.currentCommand; } }
-        /// <summary>
-        /// The description of the error, if occured.
-        /// </summary>
-        public string ErrorMessage { get { return this.errorMessage; } }
-        /// <summary>
-        /// The lines of the response message.
-        /// </summary>
-        public ReadOnlyCollection<string> Message { get { return this.message; } }
-        /// <summary>
-        /// The value of an attribute in the MPD response.
-        /// </summary>
-        /// <param name="key">The name of the attribute.</param>
-        /// <returns>The value of the attribute</returns>
-        public string this[string key]
-        {
-            get
-            {
-                if (this.dictionary == null)
-                {
-                    this.dictionary = new Dictionary<string,string>();
-
-                    foreach (string line in this.message)
-                    {
-                        Match match = LINE_REGEX.Match(line);
-                        if (match.Success)
-                            this.dictionary[match.Result("$key")] = match.Result("$value");
-                    }
-                }
-
-                return this.dictionary[key];
-            }
-        }
-        /// <summary>
-        /// The number of lines in the response message.
-        /// </summary>
-        public int Count { get { return this.message.Count; } }
-        /// <summary>
-        /// A line in the MPD response as KeyValuePair. If the message cannot be separated
-        /// into key and value according to the MPD protocol spec, a KeyValuePair is returned
-        /// with the key null and the value the whole text of the line.
-        /// </summary>
-        /// <param name="line">The index of the line.</param>
-        /// <returns>The requested line as KeyValuePair.</returns>
-        public KeyValuePair<string, string> this[int line]
-        {
-            get
-            {
-                Match match = LINE_REGEX.Match(this.message[line]);
-                if (match.Success)
-                    return new KeyValuePair<string, string>(match.Result("${key}"), match.Result("${value}"));
-                else
-                    return new KeyValuePair<string,string>(null, this.message[line]);
-            }
-        }
-        /// <summary>
-        /// Creates a new MpdResponse from a list of lines in case no error occured.
-        /// </summary>
-        /// <param name="message">The response to an MPD command.</param>
-        public MpdResponse( ReadOnlyCollection<string> message )
-        {
-            if (message == null)
-                throw new ArgumentNullException("message");
-
-            this.isError = false;
-            this.errorCode = -1;
-            this.commandListNum = 0;
-            this.currentCommand = null;
-            this.errorMessage = null;
-            this.message = message;
-        }
-        /// <summary>
-        /// Creates a new MpdResponse in case an error occured.
-        /// </summary>
-        /// <param name="errorCode">The code of the error.</param>
-        /// <param name="commandListNum">The index of the command which raised the error.</param>
-        /// <param name="currentCommand">The command that raised the error.</param>
-        /// <param name="errorMessage">The message describing the error.</param>
-        /// <param name="message">The text of the standard MPD response.</param>
-        public MpdResponse( int errorCode, int commandListNum, string currentCommand, string errorMessage, ReadOnlyCollection<string> message)
-        {
-            if (currentCommand == null)
-                throw new ArgumentNullException("currentCommand");
-            if (errorMessage == null)
-                throw new ArgumentNullException("errorMessage");
-            if (message == null)
-                throw new ArgumentNullException("message");
-
-            this.isError = true;
-            this.errorCode = errorCode;
-            this.commandListNum = commandListNum;
-            this.currentCommand = currentCommand;
-            this.errorMessage = errorMessage;
-            this.message = message;
-        }
-        /// <summary>
-        /// Returns the values in all lines with the given attribute.
-        /// </summary>
-        /// <param name="attribute">The attribute who's values are reguested.</param>
-        /// <returns>The values in all lines with the given attribute.</returns>
-        public List<string> getAttributeValueList(string attribute)
-        {
-            List<string> ret = new List<string>();
-
-            foreach (string line in this.message)
-            {
-                Match match = LINE_REGEX.Match(line);
-                if (match.Success)
-                {
-                    string key = match.Result("${key}");
-                    if( ( key != null ) && key.Equals( attribute ) )
-                    {
-                        string value = match.Result("${value}");
-                        if( value != null )
-                            ret.Add( value );
-                    }
-                }
-            }
-
-            return ret;
-        }
-        /// <summary>
-        /// Returns only the value parts in all key/value pairs in the response.
-        /// </summary>
-        /// <returns>The list of values in all key/value pairs in the response.</returns>
-        public List<string> getValueList()
-        {
-            List<string> ret = new List<string>();
-
-            foreach (string line in this.message)
-            {
-                Match match = LINE_REGEX.Match(line);
-                if (match.Success)
-                {
-                    string value = match.Result("${value}");
-                    if (value != null)
-                        ret.Add(value);
-                }
-            }
-
-            return ret;
-        }
-        /// <summary>
-        /// Builds the response text of the MPD server from the object.
-        /// </summary>
-        /// <returns>The response text of the MPD server from the object.</returns>
-        public override string ToString()
-        {
-            StringBuilder builder = new StringBuilder();
-            foreach (string line in this.message)
-                builder.AppendLine(line);
-
-            if (this.isError)
-            {
-                builder.Append(ACK);
-                builder.Append(" [");
-                builder.Append(this.errorMessage);
-                builder.Append('@');
-                builder.Append(this.commandListNum);
-                builder.Append("] {");
-                builder.Append(this.currentCommand);
-                builder.Append("} ");
-                builder.Append(this.errorMessage);
-                //ACK [50@1] {play} song doesn't exist: "10240"
-            }
-            else
-                builder.Append(OK);
-
-            return builder.ToString();
-        }
-
-        #region IEnumerable<KeyValuePair<string,string>> Members
-        /// <summary>
-        /// Returns an enumerator for all KeyValuePairs in the MPD response.
-        /// </summary>
-        /// <returns>An enumerator for all KeyValuePairs in the MPD response.</returns>
-        IEnumerator<KeyValuePair<string, string>> IEnumerable<KeyValuePair<string, string>>.GetEnumerator()
-        {
-            return new MpdResponseEnumerator(this);
-        }
-
-        #endregion
-
-        #region IEnumerable Members
-        /// <summary>
-        /// Returns an enumerator for all KeyValuePairs in the MPD response.
-        /// </summary>
-        /// <returns>An enumerator for all KeyValuePairs in the MPD response.</returns>
-        System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator()
-        {
-            return new MpdResponseEnumerator(this);
-        }
-
-        #endregion
-    }
-    /// <summary>
-    /// A class for enumerating over the KeyValuePairs in the response.
-    /// </summary>
-    public class MpdResponseEnumerator :IEnumerator<KeyValuePair<string, string>>
-    {
-        private readonly MpdResponse response;
-        private int position = -1;
-        private KeyValuePair<string, string> current;
-        /// <summary>
-        /// Creates a new MpdResponseEnumerator.
-        /// </summary>
-        /// <param name="response">The response to enumerate over.</param>
-        protected internal MpdResponseEnumerator(MpdResponse response)
-        {
-            this.response = response;
-        }
-
-        #region IEnumerator<KeyValuePair<string,string>> Members
-        /// <summary>
-        /// Returns the current element of the enumerator.
-        /// </summary>
-        KeyValuePair<string, string> IEnumerator<KeyValuePair<string, string>>.Current
-        {
-            get { return this.current; }
-        }
-
-        #endregion
-
-        #region IDisposable Members
-
-        void IDisposable.Dispose()
-        {
-            this.position = -1;
-        }
-
-        #endregion
-
-        #region IEnumerator Members
-        /// <summary>
-        /// Returns the current element of the enumerator.
-        /// </summary>
-        object System.Collections.IEnumerator.Current
-        {
-            get { return this.current; }
-        }
-        /// <summary>
-        /// Moves the enumerator to the next KeyValuePair in the MPD response.
-        /// </summary>
-        /// <returns>If the enumerator has any values left.</returns>
-        bool System.Collections.IEnumerator.MoveNext()
-        {
-            this.position++;
-            if (this.position < this.response.Count)
-            {
-                this.current = this.response[this.position];
-                return true;
-            }
-            else
-                return false;
-        }
-        /// <summary>
-        /// Sets the enumerator to it's initial state.
-        /// </summary>
-        void System.Collections.IEnumerator.Reset()
-        {
-            this.position = -1;
-        }
-
-        #endregion
-    }
-}

LibMpc/Tags.cs

@@ -1,39 +0,0 @@
-namespace LibMpc
-{
-    /// <summary>
-    /// https://www.musicpd.org/doc/protocol/tags.html
-    /// </summary>
-    public class Tags
-    {
-        internal class Tag : ITag
-        {
-            internal Tag(string value)
-            {
-                Value = value;
-            }
-
-            public string Value { get; }
-        }
-
-        public ITag Artist { get; } = new Tag("artist");
-        public ITag ArtistSort { get; } = new Tag("artistsort");
-        public ITag Album { get; } = new Tag("album");
-        public ITag AlbumSort { get; } = new Tag("albumsort");
-        public ITag AlbumArtist { get; } = new Tag("albumartist");
-        public ITag AlbumArtistSort { get; } = new Tag("albumartistsort");
-        public ITag Title { get; } = new Tag("title");
-        public ITag Track { get; } = new Tag("track");
-        public ITag Name { get; } = new Tag("name");
-        public ITag Genre { get; } = new Tag("genre");
-        public ITag Date { get; } = new Tag("date");
-        public ITag Composer { get; } = new Tag("composer");
-        public ITag Performer { get; } = new Tag("performer");
-        public ITag Comment { get; } = new Tag("comment");
-        public ITag Disc { get; } = new Tag("disc");
-    }
-
-    public interface ITag
-    {
-        string Value { get; }
-    }
-}

LibMpc/Tags/FindTags.cs

@@ -0,0 +1,13 @@
+namespace LibMpc
+{
+    /// <summary>
+    /// https://www.musicpd.org/doc/protocol/database.html : find {TYPE} {WHAT} [...] [window START:END]
+    /// </summary>
+    public class FindTags
+    {
+        public static ITag Any { get; } = new Tag("any");
+        public static ITag File { get; } = new Tag("file");
+        public static ITag Base { get; } = new Tag("base");
+        public static ITag ModifiedSince { get; } = new Tag("modified-since");
+    }
+}

LibMpc/Tags/MpdTags.cs

@@ -0,0 +1,24 @@
+namespace LibMpc
+{
+    /// <summary>
+    /// https://www.musicpd.org/doc/protocol/tags.html
+    /// </summary>
+    public class MpdTags
+    {
+        public static ITag Artist { get; } = new Tag("artist");
+        public static ITag ArtistSort { get; } = new Tag("artistsort");
+        public static ITag Album { get; } = new Tag("album");
+        public static ITag AlbumSort { get; } = new Tag("albumsort");
+        public static ITag AlbumArtist { get; } = new Tag("albumartist");
+        public static ITag AlbumArtistSort { get; } = new Tag("albumartistsort");
+        public static ITag Title { get; } = new Tag("title");
+        public static ITag Track { get; } = new Tag("track");
+        public static ITag Name { get; } = new Tag("name");
+        public static ITag Genre { get; } = new Tag("genre");
+        public static ITag Date { get; } = new Tag("date");
+        public static ITag Composer { get; } = new Tag("composer");
+        public static ITag Performer { get; } = new Tag("performer");
+        public static ITag Comment { get; } = new Tag("comment");
+        public static ITag Disc { get; } = new Tag("disc");
+    }
+}

LibMpc/Tags/Tag.cs

@@ -0,0 +1,18 @@
+namespace LibMpc
+{
+    public interface ITag
+    {
+        string Value { get; }
+    }
+
+
+    internal class Tag : ITag
+    {
+        internal Tag(string value)
+        {
+            Value = value;
+        }
+
+        public string Value { get; }
+    }
+}

LibMpc/project.json

@@ -1,8 +1,9 @@
-{
+{
   "version": "1.0.0-*",
 
   "dependencies": {
-    "NETStandard.Library": "1.6.0"
+    "NETStandard.Library": "1.6.0",
+    "Newtonsoft.Json": "9.0.1"
   },
 
   "frameworks": {

LibMpcApp/Program.cs

@@ -1,7 +1,6 @@
 using System;
 using System.Net;
 using LibMpc;
-using System.Collections.Generic;
 
 namespace LibMpcApp
 {
@@ -10,11 +9,6 @@ namespace LibMpcApp
     /// </summary>
     public class Program
     {
-        private static readonly Dictionary<int, Func<object, IMpcCommand>> _commands = new Dictionary<int, Func<object, IMpcCommand>>
-        {
-            { 1,  input => new Commands.Reflection.TagTypes() }
-        };
-
         public static void Main(string[] args)
         {
             var mpc = new Mpc(new IPEndPoint(IPAddress.Loopback, 6600));
@@ -38,12 +32,27 @@ namespace LibMpcApp
             int userInput = 0;
             while ((userInput = DisplayMenu()) != 99)
             {
-                Func<object, IMpcCommand> command;
                 var response = new object();
 
-                if (_commands.TryGetValue(userInput, out command))
+                switch (userInput)
                 {
-                    response = mpc.SendAsync(command(null)).GetAwaiter().GetResult();
+                    case 11:
+                        response = mpc.SendAsync(new Commands.Output.DisableOutput(0)).GetAwaiter().GetResult();
+                        break;
+                    case 12:
+                        response = mpc.SendAsync(new Commands.Output.EnableOutput(0)).GetAwaiter().GetResult();
+                        break;
+                    case 13:
+                        response = mpc.SendAsync(new Commands.Output.Outputs()).GetAwaiter().GetResult();
+                        break;
+
+                    case 24:
+                        response = mpc.SendAsync(new Commands.Reflection.TagTypes()).GetAwaiter().GetResult();
+                        break;
+
+                    case 313:
+                        response = mpc.SendAsync(new Commands.Database.Update()).GetAwaiter().GetResult();
+                        break;
                 }
 
                 Console.WriteLine("Response: ");
@@ -55,7 +64,21 @@ namespace LibMpcApp
         {
             Console.WriteLine();
             Console.WriteLine("Commands: ");
-            Console.WriteLine("1. tagtypes");
+
+            Console.WriteLine();
+            Console.WriteLine("11. disableoutput 0");
+            Console.WriteLine("12. enableoutput 0");
+            Console.WriteLine("13. outputs");
+
+            Console.WriteLine();
+            Console.WriteLine("Reflection");
+            Console.WriteLine("24. tagtypes");
+
+            Console.WriteLine();
+            Console.WriteLine("Database");
+            Console.WriteLine("313. update");
+
+            Console.WriteLine();
             Console.WriteLine("99. Exit");
             Console.WriteLine();
             var result = Console.ReadLine();