/// <summary>
/// Processes a Zero Length Path
/// </summary>
/// <param name="path">Path</param>
/// <param name="context">SPARQL Evaluation Context</param>
/// <returns></returns>
public virtual BaseMultiset ProcessZeroLengthPath(ZeroLengthPath path, SparqlEvaluationContext context)
{
if (context == null)
{
context = this.GetContext();
}
return(path.Evaluate(context));
}
/// <summary>
/// Converts a Path into its Algebra Form
/// </summary>
/// <param name="context">Path Transformation Context</param>
/// <returns></returns>
public override ISparqlAlgebra ToAlgebra(PathTransformContext context)
{
PathTransformContext lhsContext = new PathTransformContext(context);
PathTransformContext rhsContext = new PathTransformContext(context);
ISparqlAlgebra lhs = new ZeroLengthPath(lhsContext.Subject, lhsContext.Object, this._path);
ISparqlAlgebra rhs = this._path.ToAlgebra(rhsContext);
return(new Distinct(new Union(lhs, rhs)));
}
/// <summary>
/// Processes a Zero Length Path.
/// </summary>
/// <param name="path">Path.</param>
/// <param name="context">SPARQL Evaluation Context.</param>
/// <returns></returns>
public override BaseMultiset ProcessZeroLengthPath(ZeroLengthPath path, SparqlEvaluationContext context)
{
return(ExplainAndEvaluate <ZeroLengthPath>(path, context, base.ProcessZeroLengthPath));
}
