Utf8StringData.cs

using System;
using System.Text;
using System.Threading.Tasks;
using Waher.Networking;
using Waher.Networking.MQTT;
using Waher.Runtime.Inventory;
using Waher.Runtime.Language;
using Waher.Things.ControlParameters;
using Waher.Things.SensorData;
 
namespace Waher.Things.Mqtt.Model.Encapsulations
{
    public class Utf8StringData : MqttData
    {
        private string value;
 
        public Utf8StringData()
            : base()
        {
        }
 
        public Utf8StringData(MqttTopic Topic, string Value)
            : base(Topic)
        {
            this.value = Value;
        }
 
        public override Task<DataProcessingResult> DataReported(MqttTopic Topic, MqttContent Content)
        {
            string s = Content.DataString;
            byte[] Bin = Encoding.UTF8.GetBytes(s);
            byte[] Data = Content.Data;
            int i, c = Bin.Length;
 
            if (c != Data.Length)
                return Task.FromResult(DataProcessingResult.Incompatible);
 
            for (i = 0; i < c; i++)
            {
                if (Bin[i] != Data[i])
                    return Task.FromResult(DataProcessingResult.Incompatible);
            }
 
            this.value = s;
            this.Timestamp = DateTime.UtcNow;
            this.QoS = Content.Header.QualityOfService;
            this.Retain = Content.Header.Retain;
 
            return Task.FromResult(DataProcessingResult.ProcessedNewMomentaryValues);
        }
 
        public override Task<string> GetTypeName(Language Language)
        {
            return Language.GetStringAsync(typeof(MqttTopicNode), 40, "String");
        }
 
        public override Task StartReadout(ThingReference ThingReference, ISensorReadout Request, string Prefix, bool Last)
        {
            Request.ReportFields(Last, new StringField(ThingReference, this.Timestamp, this.Append(Prefix, "Value"),
                this.value, FieldType.Momentary, FieldQoS.AutomaticReadout));
            return Task.CompletedTask;
        }
 
        public override bool IsControllable => true;
 
        public override ControlParameter[] GetControlParameters()
        {
            return new ControlParameter[]
            {
                new StringControlParameter("Value", "Publish", "Value:", "String value of topic.",
                    (n) => Task.FromResult<string>(this.value),
                    (n, v) =>
                    {
                        this.value = v;
                        this.Topic.MqttClient.PUBLISH(this.Topic.FullTopic, this.QoS, this.Retain, Encoding.UTF8.GetBytes(v));
                        return Task.CompletedTask;
                    })
            };
        }
 
        public override void SnifferOutput(ICommunicationLayer Output)
        {
            this.Information(Output, this.value.ToString());
        }
 
        public override Grade DefaultSupport => Grade.Ok;
 
        public override IMqttData CreateNew(MqttTopic Topic, MqttContent Content)
        {
            IMqttData Result = new Utf8StringData(Topic, default);
            Result.DataReported(Topic, Content);
            return Result;
        }
    }
}