DateLiteral.cs

using System;
using Waher.Content.Semantic.Ontologies;
using Waher.Content.Xml;
using Waher.Runtime.Inventory;
 
namespace Waher.Content.Semantic.Model.Literals
{
    public class DateLiteral : SemanticLiteral
    {
        public DateLiteral()
            : base()
        {
        }
 
        public DateLiteral(DateTime Value)
            : base(Value, XML.Encode(Value, true))
        {
        }
 
        public DateLiteral(DateTime Value, string StringValue)
            : base(Value, StringValue)
        {
        }
 
        public const string TypeUri = XmlSchema.Namespace + "date";
        
        public override string StringType => TypeUri;
 
        public override Grade Supports(Type ValueType)
        {
            return Grade.Barely;
        }
 
        public override ISemanticLiteral Parse(string Value, string DataType, string Language)
        {
            if (XML.TryParse(Value, out DateTime TP))
                return new DateLiteral(TP, Value);
            else
                return new CustomLiteral(Value, DataType, Language);
        }
 
        public override ISemanticLiteral Encapsulate(object Value)
        {
            if (Value is DateTime Typed && Typed.TimeOfDay == TimeSpan.Zero)
                return new DateLiteral(Typed);
            else
                return new StringLiteral(Value?.ToString() ?? string.Empty);
        }
 
        public override bool Equals(object obj)
        {
            return obj is DateLiteral Typed &&
                Typed.StringValue == this.StringValue;
        }
 
        public override int GetHashCode()
        {
            return this.StringValue.GetHashCode();
        }
    }
}