protected override PlaceDataObject DoGet(PlaceDataObject entity, LambdaExpression securityFilterExpression, List <string> includes, IObjectsDataSet context, Dictionary <string, object> parameters)
{
var uri = entity.URI;
SparqlRemoteEndpoint endpoint = new SparqlRemoteEndpoint(new Uri("http://dbpedia.org/sparql"), "http://dbpedia.org");
string queryString = @"SELECT ?name, ?abstract
WHERE {
?place rdfs:label ?name .
?place dbo:abstract ?abstract .
FILTER langMatches(lang(?name), 'en')
FILTER langMatches(lang(?abstract), 'en')}";
queryString = queryString.Replace("?place ", $"<{uri}> ");
//Make a SELECT query against the Endpoint
SparqlResultSet results = endpoint.QueryWithResultSet(queryString);
var result = results.Single();
var place = new PlaceDataObject();
var dataset = ApplicationSettings.Container.Resolve <IObjectsDataSet>();
dataset.AddObject(place);
place.URI = entity.URI;
place.Name = (result.Where(r => r.Key == "name").Single().Value as BaseLiteralNode).Value;
place.Abstract = (result.Where(r => r.Key == "abstract").Single().Value as BaseLiteralNode)?.Value;
place.IsNew = false;
place.IsDirty = false;
return(place);
}
protected override int DoCount(LambdaExpression securityFilterExpression, string filterPredicate, object[] filterArguments, IObjectsDataSet context, Dictionary <string, object> parameters)
{
int count;
var regex = new Regex("Name\\.Contains\\(\"(.*)\"\\)");
string nameFilter = null;
var match = regex.Match(filterPredicate);
if (match.Success)
{
nameFilter = match.Groups[1].Value;
}
SparqlRemoteEndpoint endpoint = new SparqlRemoteEndpoint(new Uri("http://dbpedia.org/sparql"), "http://dbpedia.org");
//Make a SELECT query against the Endpoint
string query =
@"SELECT count(?place) WHERE
{
{?place a <http://dbpedia.org/ontology/HistoricPlace>}
UNION
{?place a <http://dbpedia.org/ontology/Monument>}
UNION
{?place a <http://dbpedia.org/ontology/Garden>}
UNION
{?place a <http://dbpedia.org/ontology/Cemetery>}
UNION
{?place a <http://dbpedia.org/ontology/ArchitecturalStructure>}
UNION
{?place a <http://dbpedia.org/ontology/Park>}
UNION
{?place a <http://dbpedia.org/ontology/NaturalPlace>}
?place rdfs:label ?name .
FILTER langMatches(lang(?name), 'en')
";
if (!String.IsNullOrEmpty(nameFilter))
{
query += $"FILTER regex(?name,\"{nameFilter}\",\"i\")";
}
query += "}";
//Make a SELECT query against the Endpoint
SparqlResultSet results = endpoint.QueryWithResultSet(query);
var res = results.Single();
count = Convert.ToInt32((res.Single().Value as BaseLiteralNode).Value);
return(count);
}
protected override int DoCount(LambdaExpression securityFilterExpression, string filterPredicate, object[] filterArguments, IObjectsDataSet context, Dictionary <string, object> parameters)
{
int count;
SparqlRemoteEndpoint endpoint = new SparqlRemoteEndpoint(new Uri("http://dbpedia.org/sparql"), "http://dbpedia.org");
//Make a SELECT query against the Endpoint
SparqlResultSet results = endpoint.QueryWithResultSet("SELECT count(?country) WHERE { ?country a <http://dbpedia.org/class/yago/WikicatMemberStatesOfTheUnitedNations> }");
var res = results.Single();
count = Convert.ToInt32((res.Single().Value as BaseLiteralNode).Value);
return(count);
}
