DatabaseTriple.cs

using Waher.Content.Semantic;
using Waher.Content.Semantic.Model;
using Waher.Persistence.Attributes;
 
namespace Waher.Script.Persistence.SPARQL.Sources
{
    [CollectionName("GraphStoreTriples")]
    [TypeName(TypeNameSerialization.None)]
    [Index("GraphKey", "S", "P", "O")]
    [Index("GraphKey", "S", "O", "P")]
    [Index("GraphKey", "P", "S", "O")]
    [Index("GraphKey", "O", "S", "P")]
    [Index("GraphKey", "P", "O", "S")]
    [Index("GraphKey", "O", "P", "S")]
    public class DatabaseTriple : ISemanticTriple
    {
        public DatabaseTriple()
        {
        }
 
        [ObjectId]
        public string ObjectId { get; set; }
 
        public long GraphKey { get; set; }
 
        public SemanticElement S { get; set; }
 
        public SemanticElement P { get; set; }
 
        public SemanticElement O { get; set; }
 
        public ISemanticElement Subject => this.S;
 
        public ISemanticElement Predicate => this.P;
 
        public ISemanticElement Object => this.O;
 
        public ISemanticElement this[int Index]
        {
            get
            {
                switch (Index)
                {
                    case 0: return this.S;
                    case 1: return this.P;
                    case 2: return this.O;
                    default: return null;
                }
            }
        }
    }
}