began dbpedia integration

backend/WebSem/.idea/.idea.WebSem/.idea/workspace.xml

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+    <entry file="file://$PROJECT_DIR$/WebApiWebSem/DataAccess/ModelsDbo.cs">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="108">
-          <caret line="6" column="16" lean-forward="true" selection-start-line="6" selection-start-column="16" selection-end-line="6" selection-end-column="16" />
-          <folding />
+        <state relative-caret-position="535">
+          <caret line="50" column="20" lean-forward="false" selection-start-line="50" selection-start-column="20" selection-end-line="50" selection-end-column="20" />
+          <folding>
+            <marker date="1489889072103" expanded="true" signature="6:192" ph="..." />
+            <marker date="1489889072103" expanded="true" signature="227:1629" ph="{...}" />
+            <marker date="1489889072103" expanded="true" signature="263:1627" ph="{...}" />
+            <marker date="1489889072103" expanded="true" signature="343:635" ph="{...}" />
+            <marker date="1489889072103" expanded="true" signature="384:441" ph="{...}" />
+            <marker date="1489889072103" expanded="true" signature="495:624" ph="{...}" />
+            <marker date="1489889072103" expanded="true" signature="697:1309" ph="{...}" />
+            <marker date="1489889072103" expanded="true" signature="738:795" ph="{...}" />
+            <marker date="1489889072103" expanded="true" signature="843:1298" ph="{...}" />
+            <marker date="1489889072103" expanded="true" signature="1384:1621" ph="{...}" />
+            <marker date="1489889072103" expanded="true" signature="1462:1608" ph="{...}" />
+          </folding>
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/WebApiWebSem/DataAccess/DbPediaDataAccess.cs">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="463">
+          <caret line="134" column="12" lean-forward="true" selection-start-line="134" selection-start-column="12" selection-end-line="134" selection-end-column="12" />
+          <folding>
+            <marker date="1489890980119" expanded="true" signature="6:327" ph="..." />
+            <marker date="1489890980119" expanded="true" signature="362:5964" ph="{...}" />
+            <marker date="1489890980119" expanded="true" signature="399:5962" ph="{...}" />
+            <marker date="1489890980119" expanded="true" signature="1211:1319" ph="{...}" />
+            <marker date="1489890980119" expanded="true" signature="1370:1451" ph="{...}" />
+            <marker date="1489890980119" expanded="true" signature="1516:1906" ph="{...}" />
+            <marker date="1489890980119" expanded="true" signature="1585:1754" ph="{...}" />
+            <marker date="1489890980119" expanded="true" signature="1786:1896" ph="{...}" />
+            <marker date="1489890980119" expanded="true" signature="1969:3220" ph="{...}" />
+            <marker date="1489890980119" expanded="true" signature="2030:2100" ph="{...}" />
+            <marker date="1489890980119" expanded="true" signature="2156:3186" ph="{...}" />
+            <marker date="1489890980119" expanded="true" signature="2279:2371" ph="{...}" />
+            <marker date="1489890980119" expanded="true" signature="2409:2498" ph="{...}" />
+            <marker date="1489890980119" expanded="true" signature="2547:2620" ph="{...}" />
+            <marker date="1489890980119" expanded="true" signature="2671:2750" ph="{...}" />
+            <marker date="1489890980119" expanded="true" signature="2802:2885" ph="{...}" />
+            <marker date="1489890980119" expanded="true" signature="2906:3172" ph="{...}" />
+            <marker date="1489890980119" expanded="true" signature="3002:3152" ph="{...}" />
+            <marker date="1489890980119" expanded="true" signature="3317:5956" ph="{...}" />
+            <marker date="1489890980119" expanded="true" signature="3586:4021" ph="{...}" />
+            <marker date="1489890980119" expanded="true" signature="4061:4741" ph="{...}" />
+            <marker date="1489890980119" expanded="true" signature="5018:5110" ph="{...}" />
+            <marker date="1489890980119" expanded="true" signature="5423:5513" ph="{...}" />
+            <marker date="1489890980119" expanded="true" signature="5584:5875" ph="{...}" />
+            <marker date="1489890980119" expanded="true" signature="5746:5851" ph="{...}" />
+          </folding>
         </state>
       </provider>
     </entry>

backend/WebSem/WebApiWebSem/Business/ArticlesBusiness.cs

 using Luticate2.Utils.Business;
+using Luticate2.Utils.Dbo.Basic;
+using Luticate2.Utils.Dbo.PaginatedRequest;
+using Luticate2.Utils.Dbo.Result;
 using Luticate2.Utils.Interfaces;
 using WebApiWebSem.DataAccess;
 using WebApiWebSem.Dbo.Articles;
 {
     public class ArticlesBusiness : LuCrudBusiness<ArticlesDataAccess, ArticlesAddDbo, ArticlesDbo, ArticlesEditDbo, string>
     {
-        public ArticlesBusiness(ArticlesDataAccess dataAccess, ILuNotificationsBusiness notificationsBusiness) : base(dataAccess, notificationsBusiness)
+        private readonly DbPediaDataAccess _dbPediaDataAccess;
+
+        public ArticlesBusiness(ArticlesDataAccess dataAccess, ILuNotificationsBusiness notificationsBusiness, DbPediaDataAccess dbPediaDataAccess) : base(dataAccess, notificationsBusiness)
         {
+            _dbPediaDataAccess = dbPediaDataAccess;
             EntityType = "articles";
         }
+
+        public override LuResult<LuPaginatedDbo<ArticlesDbo>> GetMultiple(LuPaginatedRequestDbo request)
+        {
+            return _dbPediaDataAccess.GetMultiple(request);
+//            var result = _dbPediaDataAccess.GetMultiple(request);
+//            if (result.Status == LuStatus.BackendError)
+//            {
+//                return base.GetMultiple(request);
+//            }
+//            return result;
+        }
     }
 }

backend/WebSem/WebApiWebSem/DataAccess/ArticlesDataAccess.cs

 {
     public class ArticlesDataAccess : LuEfCrudDataAccess<articles, ArticlesAddDbo, ArticlesDbo, ArticlesEditDbo, WsDbContext, string>
     {
-        protected static IList<string> Types = new List<string>{"home", "persons", "locations", "countries"};
+        public static IList<string> Types = new List<string>{"home", "persons", "locations", "countries"};
 
         public ArticlesDataAccess(IServiceProvider serviceProvider) : base(serviceProvider)
         {
             return db.articles;
         }
 
-        protected string GetFilterType(LuFilterDbo filter)
+        public static string GetFilterType(LuFilterDbo filter)
         {
             var type = filter.GetFilterString("type", null);
             if (type == null || !Types.Contains(type.ToLower()))

backend/WebSem/WebApiWebSem/DataAccess/DbPediaDataAccess.cs

 using System;
+using System.Collections.Generic;
+using System.Linq;
+using Luticate2.Utils.Dbo.Basic;
+using Luticate2.Utils.Dbo.PaginatedRequest;
+using Luticate2.Utils.Dbo.Result;
+using Microsoft.Extensions.Logging;
+using VDS.RDF.Nodes;
 using VDS.RDF.Query;
+using WebApiWebSem.Dbo.Articles;
+using WebApiWebSem.Dbo.ArticlesFields;
 
 namespace WebApiWebSem.DataAccess
 {
     public class DbPediaDataAccess
     {
-        public void Query(string query)
+        private readonly SparqlRemoteEndpoint _sparqlRemoteEndpoint;
+        private readonly ILogger<DbPediaDataAccess> _logger;
+
+        protected string Prefixes = @"
+PREFIX owl: <http://www.w3.org/2002/07/owl#>
+PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
+PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
+PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
+PREFIX foaf: <http://xmlns.com/foaf/0.1/>
+PREFIX dc: <http://purl.org/dc/elements/1.1/>
+PREFIX : <http://dbpedia.org/resource/>
+PREFIX dbpedia2: <http://dbpedia.org/property/>
+PREFIX dbpedia: <http://dbpedia.org/>
+PREFIX skos: <http://www.w3.org/2004/02/skos/core#>
+PREFIX dbpedia-owl: <http://dbpedia.org/ontology/>
+";
+
+        public DbPediaDataAccess(SparqlRemoteEndpoint sparqlRemoteEndpoint, ILogger<DbPediaDataAccess> logger)
+        {
+            _sparqlRemoteEndpoint = sparqlRemoteEndpoint;
+            _logger = logger;
+        }
+
+        protected string Escape(string str)//TODO
         {
-            var endpoint = new SparqlRemoteEndpoint(new Uri("http://dbpedia.org/sparql"), "http://dbpedia.org");
+            return str.Replace('\'', ' ').Replace('"', ' ');
+        }
 
-            //Make a SELECT query against the Endpoint
-            var results = endpoint.QueryWithResultSet("SELECT DISTINCT ?Concept WHERE {[] a ?Concept} LIMIT 10");
-            foreach (SparqlResult result in results)
+        protected LuResult<SparqlResultSet> Query(string query)
+        {
+            _logger.LogInformation(query);
+            try
             {
-                Console.WriteLine(result.ToString());
+                var results = _sparqlRemoteEndpoint.QueryWithResultSet(query);
+                return LuResult<SparqlResultSet>.Ok(results);
             }
+            catch (Exception e)
+            {
+                return LuResult<SparqlResultSet>.Error(LuStatus.BackendError, e);
+            }
+        }
 
-            //Make a DESCRIBE query against the Endpoint
-//            var g = endpoint.QueryWithResultGraph("DESCRIBE ");
-//            foreach (var t in g.Triples)
-//            {
-//                Console.WriteLine(t.ToString());
-//            }
+        protected ArticlesDbo ModelToDbo(SparqlResult result)
+        {
+            var dbo = new ArticlesDbo
+            {
+                Fields = new List<ArticlesFieldsDbo>()
+            };
+            foreach (var variable in result.Variables)
+            {
+                string data = null;
+                var v = result[variable];
+                if (v != null)
+                {
+                    data = v.AsValuedNode().AsString();
+                }
+                if (variable == "id")
+                {
+                    dbo.Id = data.Split('/').Last();
+                }
+                else if (variable == "abstract")
+                {
+                    dbo.Text = data;
+                }
+                else if (variable == "pictureUrl")
+                {
+                    dbo.PictureUrl = data;
+                }
+                else if (variable == "pictureDesc")
+                {
+                    dbo.PictureCaption = data;
+                }
+                else
+                {
+                    dbo.Fields.Add(new ArticlesFieldsDbo
+                    {
+                        Property = variable,
+                        Type = "text/plain",
+                        Value = data
+                    });
+                }
+            }
+            return dbo;
+        }
+
+        public LuResult<LuPaginatedDbo<ArticlesDbo>> GetMultiple(LuPaginatedRequestDbo request)
+        {
+            var type = ArticlesDataAccess.GetFilterType(request.Filter);
+            string query = null;
+            string querySelect = null;
+            string queryWhereId = null;
+            string queryWhereVars = null;
+            if (type == "home")
+            {
+                querySelect = "?id ?abstract ?pictureUrl ?pictureDesc";
+                queryWhereId = @"?id foaf:isPrimaryTopicOf wikipedia-en:World_War_II .";
+                queryWhereVars = @"
+OPTIONAL { ?id dbo:abstract ?abstract FILTER(lang(?abstract) = 'en') }
+OPTIONAL { ?id foaf:depiction ?pictureUrl }
+OPTIONAL { ?id dbpedia-owl:depictionDescription ?pictureDesc }
+BIND ((?abstract) AS ?search)";
+            }
+            else if (type == "persons")
+            {
+                querySelect = "?id ?abstract ?pictureUrl ?pictureDesc (MIN(?name) AS ?name) (str(?birthDate) AS ?birthDate) (str(?deathDate) AS ?deathDate)";
+                queryWhereId = @"?id rdf:type dbo:Person ;
+?type dbr:World_War_II .";
+                queryWhereVars = @"
+OPTIONAL { ?id dbo:abstract ?abstract FILTER(lang(?abstract) = 'en') }
+OPTIONAL { ?id foaf:depiction ?pictureUrl }
+OPTIONAL { ?id dbpedia-owl:depictionDescription ?pictureDesc }
+OPTIONAL { ?id dbp:name ?name . FILTER (lang(?name) = 'en') }
+OPTIONAL { ?id dbp:birthDate ?birthDate }
+OPTIONAL { ?id dbp:deathDate ?deathDate }
+BIND (CONCAT(?abstract, ' ', ?id) AS ?search)";
+            }
+
+            var filter = $"FILTER regex(?search, '{request.Filter.Query}', 'i')";
+
+            var count = Query(string.Format(@"{0}
+SELECT (COUNT(?id) AS ?count) WHERE {{
+{1}
+{2}
+{3}
+}}
+", Prefixes, queryWhereId, queryWhereVars, filter));
+            if (!count)
+            {
+                return count.To<LuPaginatedDbo<ArticlesDbo>>();
+            }
+
+            var res = Query(string.Format(@"{0}
+SELECT DISTINCT {1} WHERE {{
+{2}
+{3}
+{4}
+}}
+ORDER BY {5}
+LIMIT {6}
+OFFSET {7}", Prefixes, querySelect, queryWhereId, queryWhereVars, filter, request.OrderBy.ToDbPediaModel(),
+                request.PerPage, request.Page * request.PerPage));
+            if (!res)
+            {
+                return res.To<LuPaginatedDbo<ArticlesDbo>>();
+            }
+            var results = new LuPaginatedDbo<ArticlesDbo>
+            {
+                Count = count.Data.Results.First()["count"].AsValuedNode().AsInteger(),
+                Data = res.Data.Results.Select(ModelToDbo).Select(dbo =>
+                {
+                    dbo.Type = type;
+                    return dbo;
+                }).ToList()
+            };
+            return LuResult<LuPaginatedDbo<ArticlesDbo>>.Ok(results);
         }
     }
 }

backend/WebSem/WebApiWebSem/DataAccess/ModelsDbo.cs

 using System.Linq;
+using Luticate2.Utils.Dbo.OrderBy;
 using Luticate2.Utils.Utils;
 using WebApiWebSem.DataAccess.Models;
 using WebApiWebSem.Dbo.Articles;
                 UpdatedAt = model.updated_at.ToDbo()
             };
         }
+
+        public static string ToDbPediaModel(this LuOrderByDbo orderByDbo)
+        {
+            return string.Join(" ", orderByDbo.Fields.Select(dbo =>
+                {
+                    var order = dbo.Asc ? "ASC" : "DESC";
+                    return $"{order}(?{dbo.Name})";
+                }));
+        }
     }
 }

backend/WebSem/WebApiWebSem/Dbo/Articles/ArticlesDbo.cs

 {
     public class ArticlesDbo : ArticlesAddDbo<ArticlesFieldsDbo>
     {
-        public DateTime CreatedAt { get; set; }
+        public DateTime? CreatedAt { get; set; }
 
         public DateTime? UpdatedAt { get; set; }
     }

backend/WebSem/WebApiWebSem/Startup.cs

+using System;
 using System.Reflection;
 using Luticate2.Utils.Controllers;
 using Microsoft.AspNetCore.Builder;
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Logging;
+using VDS.RDF.Query;
 using WebApiWebSem.Business;
 using WebApiWebSem.DataAccess;
 using WebApiWebSem.Dbo;
 
             services.AddTransient<ArticlesBusiness>();
             services.AddTransient<ArticlesDataAccess>();
+            services.AddTransient(provider => new SparqlRemoteEndpoint(new Uri("http://dbpedia.org/sparql"), "http://dbpedia.org"));
+            services.AddTransient<DbPediaDataAccess>();
 
             services.Configure<AppConfigDbo>(dbo =>
             {