IntersectionPattern.cs

using System.Collections.Generic;
using System.Threading.Tasks;
using Waher.Content.Semantic;
 
namespace Waher.Script.Persistence.SPARQL.Patterns
{
    public class IntersectionPattern : BinaryOperatorPattern
    {
        public IntersectionPattern(ISparqlPattern Left, ISparqlPattern Right)
            : base(Left, Right)
        {
        }
 
        public override async Task<IEnumerable<Possibility>> Search(ISemanticCube Cube, Variables Variables,
            IEnumerable<Possibility> ExistingMatches, SparqlQuery Query)
        {
            ExistingMatches = await this.Left.Search(Cube, Variables, ExistingMatches, Query);
            if (ExistingMatches is null)
                return null;
 
            return await this.Right.Search(Cube, Variables, ExistingMatches, Query);
        }
    }
}