Base64Literal.cs

using System;
using Waher.Content.Semantic.Ontologies;
using Waher.Runtime.Inventory;
 
namespace Waher.Content.Semantic.Model.Literals
{
    public class Base64Literal : SemanticLiteral
    {
        public Base64Literal()
            : base()
        {
        }
 
        public Base64Literal(byte[] Value)
            : base(Value, Convert.ToBase64String(Value))
        {
        }
 
        public Base64Literal(byte[] Value, string StringValue)
            : base(Value, StringValue)
        {
        }
 
        public const string TypeUri = XmlSchema.Namespace + "base64Binary";
 
        public override string StringType => TypeUri;
 
        public override Grade Supports(Type ValueType)
        {
            return ValueType == typeof(byte[]) ? Grade.Ok : Grade.NotAtAll;
        }
 
        public override ISemanticLiteral Encapsulate(object Value)
        {
            if (Value is byte[] Typed)
                return new Base64Literal(Typed);
            else
                return new StringLiteral(Value?.ToString() ?? string.Empty);
        }
 
        public override ISemanticLiteral Parse(string Value, string DataType, string Language)
        {
            try
            {
                return new Base64Literal(Convert.FromBase64String(Value), Value);
            }
            catch (Exception)
            {
                return new CustomLiteral(Value, DataType, Language);
            }
        }
 
        public override bool Equals(object obj)
        {
            return obj is Base64Literal Typed &&
                Typed.StringValue == this.StringValue;
        }
 
        public override int GetHashCode()
        {
            return this.StringValue.GetHashCode();
        }
    }
}