private string GetUserBaseUriFromFilter(string filterpredicate)
{
var uri = GetPropertyFromFilter(filterpredicate, "UserProfileUri");
uri = DataProviderHelper.GetWebIdRootURL(uri);
return(uri);
}
protected override void DoDelete(VisitedPlaceDataObject entity, LambdaExpression securityFilterExpression, IObjectsDataSet context, Dictionary <string, object> parameters)
{
var userUri = DataProviderHelper.GetWebIdRootURL(entity.UserProfileUri);
string visitedPlaceDocumentName = "myvisitedplaces.ttl";
string visitedPlaceDocumentUri = $"{userUri}/public/{visitedPlaceDocumentName}";
StringBuilder sb;
string payload = "";
if (!entity.IsNew)
{
// existing entity => we need to delete existing entry, before inserting modified one
var existingEntity = DoGet(entity, securityFilterExpression, null, context, parameters);
sb = new StringBuilder();
sb.AppendLine($":{entity.Id} ");
sb.AppendLine($" a <http://generativeobjects.com/apps#VisitedPlace> ;");
sb.AppendLine($" <http://schema.org/startDate> \"{existingEntity.Date.ToString("yyyy-MM-dd")}\" ;");
sb.AppendLine($" <http://schema.org/description> \"\"\"{existingEntity.Description}\"\"\" ; ");
sb.AppendLine($" <http://generativeobjects.com/apps#VisitedPlaceType> \"{existingEntity.Typeofplace.ToString()}\" ; ");
if (existingEntity.Typeofplace == PlaceTypesEnum.Country && entity.CountryURI != null)
{
sb.AppendLine($" <http://dbpedia.org/class/yago/WikicatMemberStatesOfTheUnitedNations> <{existingEntity.CountryURI}> . ");
}
else
{
sb.AppendLine($" <http://dbpedia.org/ontology/Place> <{existingEntity.PlaceURI}> . ");
}
payload += $"DELETE DATA {{{sb.ToString()}}} ";
}
var token = DataProviderHelper.GetSolidToken();
var statusPatch = DataProviderHelper.SendPatch(visitedPlaceDocumentUri, payload, token);
if (statusPatch != HttpStatusCode.OK)
{
throw new GOServerException("Failed to delete the visited place information");
}
}
protected override VisitedPlaceDataObject DoGet(VisitedPlaceDataObject entity, LambdaExpression securityFilterExpression, List <string> includes, IObjectsDataSet context, Dictionary <string, object> parameters)
{
var userUri = DataProviderHelper.GetWebIdRootURL(entity.UserProfileUri);
string visitedPlaceDocumentName = "myvisitedplaces.ttl";
string visitedPlacesDocumentUri = $"{userUri}/public/{visitedPlaceDocumentName}";
//string visitedPlaceUri = $"{visitedPlacesDocumentUri}#{entity.Id}"; // to be used with UriLoader.Load
string tempfile = null;
try
{
tempfile = DataProviderHelper.DownloadFile(visitedPlacesDocumentUri, ".ttl");
var g = new Graph();
g.LoadFromFile(tempfile);
//UriLoader.Load(g, new Uri(visitedPlaceDocumentUri)); // NOT WORKING ... ??? SOMEHOW SHOULD WORK
var query = new SparqlParameterizedString();
query.CommandText = @"SELECT *
WHERE
{
@VisitedPlace <http://schema.org/startDate> ?Date ;
<http://schema.org/description> ?Description.
OPTIONAL {
@VisitedPlace <http://generativeobjects.com/apps#VisitedPlaceType> ?PlaceOrCountry .
}
OPTIONAL {
@VisitedPlace <http://dbpedia.org/ontology/Place> ?PlaceURI .
}
OPTIONAL {
@VisitedPlace <http://dbpedia.org/class/yago/WikicatMemberStatesOfTheUnitedNations> ?CountryURI .
}
}";
// <http://dbpedia.org/class/yago/WikicatMemberStatesOfTheUnitedNations> ?CountryURI ;
string visitedPlaceLocalFileUri = $"file://////{tempfile}#{entity.Id}";
query.SetUri("VisitedPlace", new Uri(visitedPlaceLocalFileUri));
var results = (SparqlResultSet)g.ExecuteQuery(query);
var result = results.SingleOrDefault();
if (result == null)
{
throw new GOServerException("Cannot load the VisitedPlace");
}
var visitedPlace = MapSparqlResultToVisitedPlace(result, mapId: false);
visitedPlace.Id = entity.Id;
visitedPlace.UserProfileUri = entity.UserProfileUri;
var dataset = ApplicationSettings.Container.Resolve <IObjectsDataSet>();
dataset.AddObject(visitedPlace);
return(visitedPlace);
}
finally
{
if (File.Exists(tempfile))
{
File.Delete(tempfile);
}
}
}
