Partial.cs

using System.Collections.Generic;
using System.Xml;
using Waher.Persistence.Attributes;
using Waher.Things.SensorData;
 
namespace Waher.Service.IoTBroker.Provisioning.Rules
{
    public class Partial : Rule
    {
        private string[] names = null;
        private int mask = -1;
 
        public Partial()
            : base()
        {
        }
 
        [DefaultValueNull]
        public string[] Names
        {
            get => this.names;
            set => this.names = value;
        }
 
        [DefaultValue(-1)]
        public int Mask
        {
            get => this.mask;
            set => this.mask = value;
        }
 
        public override bool? Evaluate(Context Context)
        {
            bool? b = base.Evaluate(Context);
            if (b.HasValue && !b.Value)
                return false;
 
            Context.Types = (FieldType)((int)Context.Types & this.mask);
            if (Context.Types == 0)
                return false;
 
            if (!(this.names is null))
            {
                Dictionary<string, bool> Names = new Dictionary<string, bool>();
 
                foreach (string Field in this.names)
                {
                    if (Context.Names ==  null || Context.Names.ContainsKey(Field))
                        Names[Field] = true;
                }
 
                if (Names.Count == 0)
                    return false;
 
                Context.Names = Names;
            }
 
            return true;
        }
 
        public override void Export(XmlWriter Output)
        {
            Output.WriteStartElement("Partial", RuleNamespace);
            Output.WriteAttributeString("mask", this.mask.ToString());
 
            if (!(this.names is null))
            {
                foreach (string Name in this.names)
                    Output.WriteElementString("Name", Name);
            }
 
            base.ExportChildren(Output);
 
            Output.WriteEndElement();
        }
    }
}