Parse() public static method

Parses string as full triple name
public static Parse ( string name ) : TripleName
name string String with full triple name
return TripleName
示例#1
0
        /// <summary>Build list of triples that reference specified object</summary>
        /// <param name="predicate">Optional predicate name</param>
        /// <param name="obj">Object full name</param>
        /// <returns>List of triples</returns>
        public List <Triple> GetIncomingTriplets(string predicate, string obj)
        {
            var objectName = EnsurePrefix(TripleName.Parse(obj)).ToString();
            IQueryable <Triple> triples;

            if (!String.IsNullOrEmpty(predicate))
            {
                var predicateName = EnsurePrefix(TripleName.Parse(predicate)).ToString();
                triples = Triples.Where(t => t.Predicate == predicateName);
            }
            else
            {
                // Not very efficient as it enumerates entire database
                triples = Triples;
            }

            return(triples.
                   Include(o => o.Objects). // Include Objects collection
                   Where(t => t.Objects.Any(o => o.Object == objectName)).
                   ToArray().               // Stop LINQ to SQL and use simple collection transformations
                   Select(t => new Triple {
                Subject = t.Subject,
                Predicate = t.Predicate,
                Objects = new Collection <TripleObject>(t.Objects.Where(o => o.Object == objectName).ToArray())
            }).ToList());
        }
示例#2
0
        /// <summary>
        /// Get triple by specified parameters.
        /// </summary>
        /// <param name="subject">Subject name with prefix</param>
        /// <param name="predicate">Predicate name with prefix or null</param>
        /// <param name="obj">Object name with prefix or null</param>
        /// <param name="expandPrefixes">If 'True' returns namespaces, else - prefixes.</param>
        /// <returns>Returns list of triplets.</returns>
        /// <example>GetTriplet( “czusr:76087518-4f8e-4d3a-9bfb-2fd2332376eb”, “czpred:favorite”, null, false)</example>
        public List <Triple> GetTriplet(string subject, string predicate = null, string obj = null, bool expandPrefixes = false)
        {
            if (subject == null)
            {
                throw new ArgumentNullException("subject");
            }
            var    subjectName = EnsurePrefix(TripleName.Parse(subject));
            string subjectStr  = subjectName.ToString();

            IQueryable <Triple> triples;

            if (predicate != null)
            {
                var predicateName = EnsurePrefix(TripleName.Parse(predicate));
                var predicateStr  = predicateName.ToString();
                if (obj != null)
                {
                    var objectName = EnsurePrefix(TripleName.Parse(obj));
                    var objectStr  = objectName.ToString();
                    triples = Triples.Where(t => t.Subject == subjectStr && t.Predicate == predicateStr).Include(o => o.Objects).Where(t => t.Objects.FirstOrDefault(x => x.Object == objectStr) != null);
                }
                else
                {
                    triples = Triples.Where(t => t.Subject == subjectStr && t.Predicate == predicateStr).Include(o => o.Objects);
                }
            }
            else
            {
                triples = Triples.Where(t => t.Subject == subjectStr).Include(o => o.Objects);
            }

            if (expandPrefixes)
            {
                //ToDo:Use Join
                triples.ToList().ForEach(x =>
                {
                    x.Subject   = TryEnsureNamespace(TripleName.Parse(x.Subject)).ToExpandedString();
                    x.Predicate = TryEnsureNamespace(TripleName.Parse(x.Predicate)).ToExpandedString();
                    foreach (var o in x.Objects)
                    {
                        o.Object = TryEnsureNamespace(TripleName.Parse(o.Object)).ToExpandedString();
                    }
                });
            }

            return(triples.ToList());
        }
示例#3
0
        /// <summary>Gets owner of the triplet</summary>
        /// <param name="name">Name of the triplet. Triplets referring to timelines, exhibits, artifacts and bNodes are supported.
        /// In all other cases method returns null.</param>
        /// <param name="bNodes">List of previously examined bNodes to avoid endless recursion</param>
        /// <returns>String representation of owning user ID</returns>
        public string GetSubjectOwner(TripleName name, List <string> bNodes = null)
        {
            name = EnsurePrefix(name);
            switch (name.Prefix)
            {
            case TripleName.UserPrefix:
                return(name.Name);

            case TripleName.TimelinePrefix:
                var timelineId = Guid.Parse(name.Name);
                var timeline   = Timelines.Where(t => t.Id == timelineId).FirstOrDefault();
                if (timeline == null)
                {
                    return(null);
                }
                Entry(timeline).Reference(t => t.Collection).Load();
                return(GetCollectionOwner(timeline.Collection));

            case TripleName.ExhibitPrefix:
                var exhibitId = Guid.Parse(name.Name);
                var exhibit   = Exhibits.Where(e => e.Id == exhibitId).FirstOrDefault();
                if (exhibit == null)
                {
                    return(null);
                }
                Entry(exhibit).Reference(e => e.Collection).Load();
                return(GetCollectionOwner(exhibit.Collection));

            case TripleName.ArtifactPrefix:
                var artifactId = Guid.Parse(name.Name);
                var artifact   = ContentItems.Where(c => c.Id == artifactId).FirstOrDefault();
                if (artifact == null)
                {
                    return(null);
                }
                Entry(artifact).Reference(a => a.Collection).Load();
                return(GetCollectionOwner(artifact.Collection));

            case TripleName.TourPrefix:
                var tourId = Guid.Parse(name.Name);
                var tour   = Tours.FirstOrDefault(t => t.Id == tourId);
                if (tour == null)
                {
                    return(null);
                }
                Entry(tour).Reference(t => t.Collection).Load();
                return(GetCollectionOwner(tour.Collection));

            case "_":
                var subject = name.ToString();
                // Guard against infinite loop
                if (bNodes != null && bNodes.Contains(subject))
                {
                    return(null);
                }
                // Find subject of any triple that uses passed subject as object
                var linkedSubject = Triples.
                                    Include(t => t.Objects).
                                    Where(t => t.Objects.Any(o => o.Object == subject)).
                                    Select(t => t.Subject).FirstOrDefault();
                if (String.IsNullOrEmpty(linkedSubject))
                {
                    return(null);
                }
                // Get owner of linked subject
                if (bNodes == null)
                {
                    bNodes = new List <string>(new string[] { subject });
                }
                else
                {
                    bNodes.Add(subject);
                }
                return(GetSubjectOwner(TripleName.Parse(linkedSubject), bNodes));

            default:
                return(null);
            }
        }