DoubleLiteral.cs

using System;
using Waher.Content.Semantic.Ontologies;
using Waher.Runtime.Inventory;
 
namespace Waher.Content.Semantic.Model.Literals
{
    public class DoubleLiteral : SemanticNumericLiteral
    {
        public static readonly DoubleLiteral ZeroInstance = new DoubleLiteral(0);
 
        public static readonly DoubleLiteral OneInstance = new DoubleLiteral(1);
 
        public DoubleLiteral()
            : base()
        {
        }
 
        public DoubleLiteral(double Value)
            : base(Value, CommonTypes.Encode(Value))
        {
        }
 
        public DoubleLiteral(double Value, string StringValue)
            : base(Value, StringValue)
        {
        }
 
        public const string TypeUri = XmlSchema.Namespace + "double";
 
        public override string StringType => TypeUri;
 
        public override Grade Supports(Type ValueType)
        {
            return ValueType == typeof(double) ? Grade.Ok : Grade.NotAtAll;
        }
 
        public override double ComparableValue => (double)this.Value;
 
        public override ISemanticLiteral Parse(string Value, string DataType, string Language)
        {
            if (CommonTypes.TryParse(Value, out double d))
                return new DoubleLiteral(d, Value);
            else
                return new CustomLiteral(Value, DataType, Language);
        }
 
        public override ISemanticLiteral Encapsulate(object Value)
        {
            if (Value is double Typed)
                return new DoubleLiteral(Typed);
            else
                return new StringLiteral(Value?.ToString() ?? string.Empty);
        }
 
        public override bool Equals(object obj)
        {
            return obj is DoubleLiteral Typed &&
                Typed.StringValue == this.StringValue;
        }
 
        public override int GetHashCode()
        {
            return this.StringValue.GetHashCode();
        }
    }
}