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Path.cs
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Path.cs
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/*
// <copyright>
// dotNetRDF is free and open source software licensed under the MIT License
// -------------------------------------------------------------------------
//
// Copyright (c) 2009-2021 dotNetRDF Project (http://dotnetrdf.org/)
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is furnished
// to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
// </copyright>
*/
namespace VDS.RDF.Shacl
{
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using VDS.RDF.Query;
using VDS.RDF.Query.Builder;
using VDS.RDF.Query.Patterns;
using VDS.RDF.Shacl.Paths;
/// <summary>
/// Represents a SHACL property path.
/// </summary>
public abstract class Path : WrapperNode
{
/// <summary>
/// Initializes a new instance of the <see cref="Path"/> class.
/// </summary>
/// <param name="node"></param>
[DebuggerStepThrough]
protected Path(INode node)
: base(node)
{
}
internal abstract Query.Paths.ISparqlPath SparqlPath { get; }
internal abstract IEnumerable<Triple> AsTriples { get; }
internal static Path Parse(INode value)
{
if (value.NodeType == NodeType.Uri)
{
return new Predicate(value);
}
if (value.IsListRoot(value.Graph))
{
return new Sequence(value);
}
var predicate = value.Graph.GetTriplesWithSubject(value).Single().Predicate;
switch (predicate)
{
case INode t when t.Equals(Vocabulary.ZeroOrMorePath): return new ZeroOrMore(value);
case INode t when t.Equals(Vocabulary.OneOrMorePath): return new OneOrMore(value);
case INode t when t.Equals(Vocabulary.AlternativePath): return new Alternative(value);
case INode t when t.Equals(Vocabulary.InversePath): return new Inverse(value);
case INode t when t.Equals(Vocabulary.ZeroOrOnePath): return new ZeroOrOne(value);
default: throw new Exception();
}
}
internal IEnumerable<INode> SelectValueNodes(INode focusNode)
{
const string value = "value";
var query = QueryBuilder.Select(value).Distinct().Where(new PropertyPathPattern(new NodeMatchPattern(focusNode), this.SparqlPath, new VariablePattern(value))).BuildQuery();
var results = focusNode.Graph.ExecuteQuery(query);
return ((SparqlResultSet)results).Select(result => result[value]);
}
}
}