GuidData.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 GuidData : MqttData
    {
        private Guid value;
 
        public GuidData()
            : base()
        {
        }
 
        public GuidData(MqttTopic Topic, Guid Value)
            : base(Topic)
        {
            this.value = Value;
        }
 
        public override Task<DataProcessingResult> DataReported(MqttTopic Topic, MqttContent Content)
        {
            if (Guid.TryParse(Content.DataString, out Guid Value))
            {
                this.value = Value;
                this.Timestamp = DateTime.UtcNow;
                this.QoS = Content.Header.QualityOfService;
                this.Retain = Content.Header.Retain;
                
                return Task.FromResult(DataProcessingResult.ProcessedNewMomentaryValues);
            }
            else
                return Task.FromResult(DataProcessingResult.Incompatible);
        }
 
        public override Task<string> GetTypeName(Language Language)
        {
            return Language.GetStringAsync(typeof(MqttTopicNode), 36, "GUID");
        }
 
        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.ToString(), FieldType.Momentary, FieldQoS.AutomaticReadout));
        
            return Task.CompletedTask;
        }
 
        public override bool IsControllable => true;
 
        public override ControlParameter[] GetControlParameters()
        {
            return new ControlParameter[]
            {
                new StringControlParameter("Value", "Publish", "Value:", "GUID value of topic.", @"^[{(]?[0-9a-fA-F]{8}[-]?([0-9a-fA-F]{4}[-]?){3}[0-9a-fA-F]{12}[)}]?$",
                    (n) => Task.FromResult<string>(this.value.ToString()),
                    (n, v) =>
                    {
                        this.value = Guid.Parse(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.Excellent;
 
        public override IMqttData CreateNew(MqttTopic Topic, MqttContent Content)
        {
            IMqttData Result = new GuidData(Topic, default);
            Result.DataReported(Topic, Content);
            return Result;
        }
    }
}