PropertiesTokenizer.cs

using System;
using System.Collections.Generic;
using System.Threading.Tasks;
using Waher.Persistence;
using Waher.Persistence.FullTextSearch;
using Waher.Persistence.FullTextSearch.Tokenizers;
using Waher.Persistence.Serialization;
using Waher.Runtime.Collections;
using Waher.Runtime.Inventory;
 
namespace Waher.Service.IoTBroker.Legal.Identity.Tokenizers
{
    public class PropertiesTokenizer : ITokenizer, IPropertyEvaluator
    {
        public PropertiesTokenizer()
        {
        }
 
        public Grade Supports(Type Type)
        {
            if (typeof(IEnumerable<Property>).IsAssignableFrom(Type))
                return Grade.Ok;
            else
                return Grade.NotAtAll;
        }
 
        public Task Tokenize(object Value, TokenizationProcess Process)
        {
            if (Value is IEnumerable<Property> Properties)
                Tokenize(Properties, Process);
 
            return Task.CompletedTask;
        }
 
        public static void Tokenize(IEnumerable<Property> Properties, TokenizationProcess Process)
        {
            if (!(Properties is null))
            {
                foreach (Property Property in Properties)
                {
                    PropertyTokenizer.Tokenize(Property, Process);
                    Process.DocumentIndexOffset++;
                }
            }
        }
 
        public Task Prepare(string Definition)
        {
            return Task.CompletedTask;
        }
 
        public async Task<object> Evaluate(object Instance)
        {
            if (Instance is LegalIdentity Identity)
                return Identity.Properties;
            else if (Instance is GenericObject Obj)
            {
                if (Obj.TryGetFieldValue("Properties", out object Obj2) &&
                    Obj2 is Array A)
                {
                    if (A.Length == 0)
                        return Array.Empty<Property>();
 
                    ChunkedList<Property> Properties = new ChunkedList<Property>(A.Length);
 
                    foreach (object Item in A)
                    {
                        if (Item is GenericObject GenProperty &&
                            await Database.Specialize(GenProperty) is Property Property)
                        {
                            Properties.Add(Property);
                        }
                        else if (Item is Property Property2)
                            Properties.Add(Property2);
                    }
 
                    return Properties;
                }
            }
            else if (Instance is IEnumerable<Property> Properties)
                return Properties;
            
            return null;
        }
 
    }
}