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");
}
}
public static void EnsurePublicTypeRegistration(string userUri, string registrationName, string registrationType, string registrationLocation)
{
// going too fast to publicTypeIndex. should follow this : https://github.com/solid/solid/blob/master/proposals/data-discovery.md
var publicTypeIndexUri = $"{userUri}/settings/publicTypeIndex.ttl";
var g = new Graph();
UriLoader.Load(g, new Uri(publicTypeIndexUri));
var query = new SparqlParameterizedString();
query.Namespaces.AddNamespace("s", new Uri("http://www.w3.org/ns/solid/terms#"));
query.Namespaces.AddNamespace("schem", new Uri("http://schema.org"));
// ?reg < http://www.w3.org/ns/solid/terms#forClass> <http://schema.org/TextDigitalDocument>.
// ?reg < http://www.w3.org/ns/solid/terms#instance> <file:///C:/public/visitedplaces.ttl>.
query.CommandText =
@"SELECT ?reg WHERE
{
?reg s:forClass @type .
?reg s:instance @location .
}";
// file:///C:/public/notes.ttl => the URI contains file:///C: because it is made relative to where the document is, and here we downloaded it to local file ...
query.SetUri("location", new Uri($"file:///C:/public/{registrationLocation}"));
query.SetUri("type", new Uri(registrationType));
var registrationExists = ((SparqlResultSet)g.ExecuteQuery(query)).Any();
var token = GetSolidToken();
if (!registrationExists)
{
// create the type registration
string payload = $"INSERT DATA {{:{registrationName} a <http://www.w3.org/ns/solid/terms#TypeRegistration>; <http://www.w3.org/ns/solid/terms#forClass> <http://schema.org/TextDigitalDocument> ; <http://www.w3.org/ns/solid/terms#instance> </public/{registrationLocation}> . }}";
var statusPatch = DataProviderHelper.SendPatch(publicTypeIndexUri, payload, token);
if (statusPatch != HttpStatusCode.OK)
{
throw new GOServerException("PATCH Failed");
}
}
var documentUri = $"{userUri}/public/{registrationLocation}";
// verify the document exists
var status = DataProviderHelper.SendHead(documentUri, token);
if (status != HttpStatusCode.OK)
{
// create the document file otherwise
/* string payload = @"@prefix : <#>.
* @prefix schem: <http://schema.org/>.
* @prefix XML: <http://www.w3.org/2001/XMLSchema#>.
* @prefix go: <http://generativeobjects.com/apps#>.";
*/
status = DataProviderHelper.SendPost($"{userUri}/public/", registrationLocation, null, token);
if (status != HttpStatusCode.OK)
{
throw new GOServerException("POST Failed");
}
}
}