public static RDFFederation CreateFederation()
{
RDFFederation federation = new RDFFederation();
federation.AddStore(CreateStore());
return(federation);
}
public static void ClearStoresFromFederationTest()
{
RDFFederation fed = StoreBuilder.CreateFederation();
fed.ClearStores();
Assert.Empty(fed);
}
public static void AddingTwoExactStoresToFederationTest()
{
RDFFederation fed = new RDFFederation();
fed.AddStore(StoreBuilder.CreateStore());
fed.AddStore(StoreBuilder.CreateStore());
Assert.NotEqual(fed.First().StoreID, fed.Last().StoreID);
}
public static void FederationEqualityTest()
{
RDFFederation fed1 = StoreBuilder.CreateFederation();
RDFFederation fed2 = StoreBuilder.CreateFederation();
//The storeIDs are still not equals, so these to federtaions never will be the same
Assert.False(fed1.Equals(fed2));
}
public static void RemoveStoreFromFederationTest()
{
RDFFederation fed = StoreBuilder.CreateFederation();
RDFMemoryStore mem = StoreBuilder.CreateStore();
fed.RemoveStore(mem);
Assert.DoesNotContain(mem, fed);
}
/// <summary>
/// Applies the query to the given federation
/// </summary>
public RDFAskQueryResult ApplyToFederation(RDFFederation federation)
{
if (federation != null) {
this.PatternGroupResultTables.Clear();
this.PatternResultTables.Clear();
RDFAskQueryResult askResult = new RDFAskQueryResult();
if (this.PatternGroups.Any()) {
//Iterate the pattern groups of the query
var fedPatternResultTables = new Dictionary<RDFPatternGroup, List<DataTable>>();
foreach (RDFPatternGroup patternGroup in this.PatternGroups) {
#region TrueFederations
foreach (RDFStore store in federation) {
//Step 1: Evaluate the patterns of the current pattern group on the current store
RDFQueryEngine.EvaluatePatterns(this, patternGroup, store);
//Step 2: Federate the patterns of the current pattern group on the current store
if (!fedPatternResultTables.ContainsKey(patternGroup)) {
fedPatternResultTables.Add(patternGroup, this.PatternResultTables[patternGroup]);
}
else {
fedPatternResultTables[patternGroup].ForEach(fprt =>
fprt.Merge(this.PatternResultTables[patternGroup].Single(prt => prt.TableName.Equals(fprt.TableName, StringComparison.Ordinal)), true, MissingSchemaAction.Add));
}
}
this.PatternResultTables[patternGroup] = fedPatternResultTables[patternGroup];
#endregion
//Step 3: Get the result table of the current pattern group
RDFQueryEngine.CombinePatterns(this, patternGroup);
//Step 4: Apply the filters of the current pattern group to its result table
RDFQueryEngine.ApplyFilters(this, patternGroup);
}
//Step 5: Get the result table of the query
DataTable queryResultTable = RDFQueryEngine.CombineTables(this.PatternGroupResultTables.Values.ToList(), false);
//Step 6: Transform the result into a boolean response
askResult.AskResult = (queryResultTable.Rows.Count > 0);
}
return askResult;
}
throw new RDFQueryException("Cannot execute ASK query because given \"federation\" parameter is null.");
}
/// <summary>
/// Applies the query to the given federation
/// </summary>
public RDFDescribeQueryResult ApplyToFederation(RDFFederation federation) {
if (federation != null) {
this.PatternGroupResultTables.Clear();
this.PatternResultTables.Clear();
RDFDescribeQueryResult describeResult = new RDFDescribeQueryResult(this.ToString());
if (!this.IsEmpty) {
//Iterate the pattern groups of the query
var fedPatternResultTables = new Dictionary<RDFPatternGroup, List<DataTable>>();
foreach (RDFPatternGroup patternGroup in this.PatternGroups) {
#region TrueFederations
foreach (RDFStore store in federation.Stores.Values) {
//Step 1: Evaluate the patterns of the current pattern group on the current store
RDFDescribeQueryEngine.EvaluatePatterns(this, patternGroup, store);
//Step 2: Federate the patterns of the current pattern group on the current store
if (!fedPatternResultTables.ContainsKey(patternGroup)) {
fedPatternResultTables.Add(patternGroup, this.PatternResultTables[patternGroup]);
}
else {
fedPatternResultTables[patternGroup].ForEach(fprt =>
fprt.Merge(this.PatternResultTables[patternGroup].Single(prt => prt.TableName.Equals(fprt.TableName, StringComparison.Ordinal)), true, MissingSchemaAction.Add));
}
}
this.PatternResultTables[patternGroup] = fedPatternResultTables[patternGroup];
#endregion
//Step 3: Get the result table of the current pattern group
RDFDescribeQueryEngine.CombinePatterns(this, patternGroup);
//Step 4: Apply the filters of the current pattern group to its result table
RDFDescribeQueryEngine.ApplyFilters(this, patternGroup);
}
//Step 5: Get the result table of the query
DataTable queryResultTable = RDFQueryEngine.CombineTables(this.PatternGroupResultTables.Values.ToList<DataTable>(), false);
//Step 6: Describe the terms on each store and merge them in the federated result table
DataTable describeResultTable = new DataTable(this.ToString());
foreach (RDFStore store in federation.Stores.Values) {
describeResultTable.Merge(RDFDescribeQueryEngine.DescribeTerms(this, store, queryResultTable), true, MissingSchemaAction.Add);
}
//Step 7: Apply the modifiers of the query to the result table
describeResult.DescribeResults = RDFDescribeQueryEngine.ApplyModifiers(this, describeResultTable);
}
else {
//In this case the only chance to proceed is to have resources in the describe terms,
//which will be used to search for S-P-O data. Variables are ignored in this scenario.
if (this.DescribeTerms.Any(dt => dt is RDFResource)) {
//Step 1: Describe the terms on each store and merge them in the federated result table
DataTable describeResultTable = new DataTable(this.ToString());
foreach (RDFStore store in federation.Stores.Values) {
describeResultTable.Merge(RDFDescribeQueryEngine.DescribeTerms(this, store, new DataTable()), true, MissingSchemaAction.Add);
}
//Step 2: Apply the modifiers of the query to the result table
describeResult.DescribeResults = RDFDescribeQueryEngine.ApplyModifiers(this, describeResultTable);
}
}
return describeResult;
}
throw new RDFQueryException("Cannot execute DESCRIBE query because given \"federation\" parameter is null.");
}
private void WorkingWithRdfModels()
{
// CREATE RESOURCE
var donaldduck = new RDFResource("http://www.waltdisney.com/donald_duck");
// CREATE BLANK RESOURCE
var disney_group = new RDFResource();
// CREATE PLAIN LITERAL
// "Donald Duck"
var donaldduck_name = new RDFPlainLiteral("Donald Duck");
// CREATE PLAIN LITERAL WITH LANGUAGE TAG
// "Donald Duck"@en-US
var donaldduck_name_enusLiteral = new RDFPlainLiteral("Donald Duck", "en-US");
// CREATE TYPED LITERAL
// "85"^^xsd:integer
var mickeymouse_age = new RDFTypedLiteral("85", RDFModelEnums.RDFDatatypes.XSD_INTEGER);
// CREATE TRIPLES
// "Mickey Mouse is 85 years old"
RDFTriple mickeymouse_is85yr
= new RDFTriple(
new RDFResource("http://www.waltdisney.com/mickey_mouse"),
new RDFResource("http://xmlns.com/foaf/0.1/age"),
new RDFTypedLiteral("85", RDFModelEnums.RDFDatatypes.XSD_INTEGER));
// "Donald Duck has english (US) name "Donald Duck""
RDFTriple donaldduck_name_enus = new RDFTriple(
new RDFResource("http://www.waltdisney.com/donald_duck"),
new RDFResource("http://xmlns.com/foaf/0.1/name"),
new RDFPlainLiteral("Donald Duck", "en-US"));
// CREATE EMPTY GRAPH
var another_graph = new RDFGraph();
var waltdisney_filled = new RDFGraph();
// CREATE GRAPH FROM A LIST OF TRIPLES
var triples = new List <RDFTriple> {
mickeymouse_is85yr, donaldduck_name_enus
};
var waltdisney = new RDFGraph(triples);
// SET CONTEXT OF A GRAPH
waltdisney.SetContext(new Uri("http://waltdisney.com/"));
// GET A DATATABLE FROM A GRAPH
var waltdisney_table = waltdisney.ToDataTable();
// GET A GRAPH FROM A DATATABLE
var waltdisney_newgraph = RDFGraph.FromDataTable(waltdisney_table);
// ITERATE TRIPLES OF A GRAPH WITH FOREACH
foreach (var t in waltdisney)
{
Console.WriteLine("Triple: " + t);
Console.WriteLine(" Subject: " + t.Subject);
Console.WriteLine(" Predicate: " + t.Predicate);
Console.WriteLine(" Object: " + t.Object);
}
// ITERATE TRIPLES OF A GRAPH WITH ENUMERATOR
var triplesEnum = waltdisney.TriplesEnumerator;
while (triplesEnum.MoveNext())
{
Console.WriteLine("Triple: " + triplesEnum.Current);
Console.WriteLine(" Subject: " + triplesEnum.Current.Subject);
Console.WriteLine(" Predicate: " + triplesEnum.Current.Predicate);
Console.WriteLine(" Object: " + triplesEnum.Current.Object);
}
// GET COUNT OF TRIPLES CONTAINED IN A GRAPH
var triplesCount = waltdisney.TriplesCount;
// MULTIPLE SELECTIONS
var multiple_selections_graph =
waltdisney.SelectTriplesBySubject(new RDFResource("http://www.waltdisney.com/donald_duck"))
.SelectTriplesByPredicate(new RDFResource("http://xmlns.com/foaf/0.1/name"));
// SET OPERATIONS
var set_operations_graph = waltdisney.IntersectWith(waltdisney_filled).UnionWith(another_graph);
/*
* var ntriplesFormat = RDFModelEnums.RDFFormats.NTriples;
* // READ N-TRIPLES FILE
* var graph = RDFGraph.FromFile(ntriplesFormat, "C:\\file.nt");
* // READ N-TRIPLES STREAM
* var graph = RDFGraph.FromStream(ntriplesFormat, inStream);
* // WRITE N-TRIPLES FILE
* graph.ToFile(ntriplesFormat, "C:\\newfile.nt");
* // WRITE N-TRIPLES STREAM
* graph.ToStream(ntriplesFormat, outStream);
*/
/*
* var turtleFormat = RDFModelEnums.RDFFormats.Turtle;
* // READ TURTLE FILE
* var graph = RDFGraph.FromFile(turtleFormat, "C:\\file.ttl");
* // READ TURTLE STREAM
* var graph = RDFGraph.FromStream(turtleFormat, inStream);
* // WRITE TURTLE FILE
* graph.ToFile(turtleFormat, "C:\\newfile.ttl");
* // WRITE TURTLE STREAM
* graph.ToStream(turtleFormat, outStream);
*/
/*
* var xmlFormat = RDFModelEnums.RDFFormats.RdfXml;
* // READ RDF/XML FILE
* var graph = RDFGraph.FromFile(xmlFormat, "C:\\file.rdf");
* // READ RDF/XML STREAM
* var graph = RDFGraph.FromStream(xmlFormat, inStream);
* // WRITE RDF/XML FILE
* graph.ToFile(xmlFormat, "C:\\newfile.rdf");
* // WRITE RDF/XML STREAM
* graph.ToStream(xmlFormat, outStream);
*/
// CREATE NAMESPACE
var waltdisney_ns = new RDFNamespace("wd", "http://www.waltdisney.com/");
// USE NAMESPACE IN RESOURCE CREATION
var duckburg = new RDFResource(waltdisney_ns + "duckburg");
var mouseton = new RDFResource(waltdisney_ns + "mouseton");
RDFNamespaceRegister.AddNamespace(waltdisney_ns);
// Retrieves a namespace by seeking presence of its prefix (null if not found). Supports prefix.cc
var ns1 = RDFNamespaceRegister.GetByPrefix("dbpedia", false); //local search
var ns2 = RDFNamespaceRegister.GetByPrefix("dbpedia", true); //search prefix.cc service if no result
// GET DEFAULT NAMESPACE
var nSpace = RDFNamespaceRegister.DefaultNamespace;
// SET DEFAULT NAMESPACE
RDFNamespaceRegister.SetDefaultNamespace(waltdisney_ns); //new graphs will default to this context
// ITERATE NAMESPACES OF REGISTER WITH FOREACH
foreach (var ns in RDFNamespaceRegister.Instance)
{
Console.WriteLine("Prefix: " + ns.NamespacePrefix);
Console.WriteLine("Namespace: " + ns.NamespaceUri);
}
// ITERATE NAMESPACES OF REGISTER WITH ENUMERATOR
var nspacesEnum = RDFNamespaceRegister.NamespacesEnumerator;
while (nspacesEnum.MoveNext())
{
Console.WriteLine("Prefix: " + nspacesEnum.Current.NamespacePrefix);
Console.WriteLine("Namespace: " + nspacesEnum.Current.NamespaceUri);
}
// CREATE TRIPLES WITH VOCABULARY FACILITIES
// "Goofy Goof is 82 years old"
RDFTriple goofygoof_is82yr = new RDFTriple(
new RDFResource(new Uri("http://www.waltdisney.com/goofy_goof").ToString()),
RDFVocabulary.FOAF.AGE,
new RDFPlainLiteral("82")
);
// "Donald Duck knows Goofy Goof"
RDFTriple donaldduck_knows_goofygoof = new RDFTriple(
new RDFResource(new Uri("http://www.waltdisney.com/donald_duck").ToString()),
RDFVocabulary.FOAF.KNOWS,
new RDFResource(new Uri("http://www.waltdisney.com/goofy_goof").ToString())
);
// CREATE TYPED LITERALS
var myAge = new RDFTypedLiteral("34", RDFModelEnums.RDFDatatypes.XSD_INT);
var myDate = new RDFTypedLiteral("2017-01-07", RDFModelEnums.RDFDatatypes.XSD_DATE);
var myDateTime = new RDFTypedLiteral("2017-01-07T23:11:05", RDFModelEnums.RDFDatatypes.XSD_DATETIME);
var myXml = new RDFTypedLiteral("<book>title</book>", RDFModelEnums.RDFDatatypes.RDF_XMLLITERAL);
var myLiteral = new RDFTypedLiteral("generic literal", RDFModelEnums.RDFDatatypes.RDFS_LITERAL);
/*
* The given list of items may be incomplete.
* A container is semantically opened to the possibility of having further elements
*
* Alt: unordered semantic, duplicates not allowed;
* Bag: unordered semantic, duplicates allowed;
* Seq: ordered semantic, duplicates allowed;
*/
// CREATE CONTAINER AND ADD ITEMS
RDFContainer beatles_cont = new RDFContainer(RDFModelEnums.RDFContainerTypes.Bag, RDFModelEnums.RDFItemTypes.Resource);
beatles_cont.AddItem(new RDFResource("http://beatles.com/ringo_starr"));
beatles_cont.AddItem(new RDFResource("http://beatles.com/john_lennon"));
beatles_cont.AddItem(new RDFResource("http://beatles.com/paul_mc_cartney"));
beatles_cont.AddItem(new RDFResource("http://beatles.com/george_harrison"));
/*
* The given list of items may not be incomplete.
* A collection is semantically closed to the possibility of having further elements
*/
// CREATE COLLECTION AND ADD ITEMS
RDFCollection beatles_coll = new RDFCollection(RDFModelEnums.RDFItemTypes.Resource);
beatles_coll.AddItem(new RDFResource("http://beatles.com/ringo_starr"));
beatles_coll.AddItem(new RDFResource("http://beatles.com/john_lennon"));
beatles_coll.AddItem(new RDFResource("http://beatles.com/paul_mc_cartney"));
beatles_coll.AddItem(new RDFResource("http://beatles.com/george_harrison"));
// ADD CONTAINER/COLLECTION TO GRAPH
waltdisney.AddContainer(beatles_cont);
waltdisney.AddCollection(beatles_coll);
// REIFY TRIPLE AND MERGE IT INTO A GRAPH
RDFGraph reifGraph = goofygoof_is82yr.ReifyTriple();
waltdisney = waltdisney.UnionWith(reifGraph);
// ASSERT SOMETHING ABOUT REIFIED TRIPLE
waltdisney.AddTriple(new RDFTriple(
new RDFResource("http://www.wikipedia.com/"),
new RDFResource("http://example.org/verb_state"),
goofygoof_is82yr.ReificationSubject
));
var existingGraph = new RDFGraph();
// REIFY CONTAINER
existingGraph.AddContainer(beatles_cont);
existingGraph.AddTriple(new RDFTriple(
new RDFResource("http://www.thebeatles.com/"),
RDFVocabulary.FOAF.GROUP,
beatles_cont.ReificationSubject
));
// REIFY COLLECTION
existingGraph.AddCollection(beatles_coll);
existingGraph.AddTriple(new RDFTriple(
new RDFResource("http://www.thebeatles.com/"),
RDFVocabulary.FOAF.GROUP,
beatles_coll.ReificationSubject
));
// WORKING WITH RDF STORES
// CREATE CONTEXT FROM STRING
var wdisney_ctx = new RDFContext("http://www.waltdisney.com/");
// CREATE CONTEXT FROM URI
var wdisney_ctx_uri = new RDFContext(new Uri("http://www.waltdisney.com/"));
// CREATE DEFAULT CONTEXT (DEFAULT NAMESPACE)
var wdisney_ctx_default = new RDFContext();
// CREATE QUADRUPLES
// "From Wikipedia.com: Mickey Mouse is 85 years old"
RDFQuadruple wk_mickeymouse_is85yr = new RDFQuadruple(
new RDFContext("http://www.wikipedia.com/"),
new RDFResource("http://www.waltdisney.com/mickey_mouse"),
RDFVocabulary.FOAF.AGE,
new RDFTypedLiteral("85", RDFModelEnums.RDFDatatypes.XSD_INTEGER)
);
// "From WaltDisney.com: Mickey Mouse is 85 years old"
RDFQuadruple wd_mickeymouse_is85yr = new RDFQuadruple(
new RDFContext("http://www.waltdisney.com/"),
new RDFResource("http://www.waltdisney.com/mickey_mouse"),
RDFVocabulary.FOAF.AGE,
new RDFTypedLiteral("85", RDFModelEnums.RDFDatatypes.XSD_INTEGER)
);
// "From Wikipedia.com: Donald Duck has english name "Donald Duck""
RDFQuadruple wk_donald_duck_name_enus = new RDFQuadruple(
new RDFContext("http://www.wikipedia.com/"),
new RDFResource("http://www.waltdisney.com/donald_duck"),
RDFVocabulary.FOAF.NAME,
new RDFPlainLiteral("Donald Duck", "en")
);
// CREATE EMPTY MEMORY STORE
var wdStore = new RDFMemoryStore();
// CREATE MEMORY STORE FROM A LIST OF QUADRUPLES
var quadruples = new List <RDFQuadruple> {
wk_mickeymouse_is85yr, wk_mickeymouse_is85yr
};
var wdStoreFilled = new RDFMemoryStore();
foreach (var q in quadruples)
{
wdStoreFilled.AddQuadruple(q);
}
// GET A DATATABLE FROM A MEMORY STORE (any kind of store can be exported to datatable)
var wdStore_table = wdStoreFilled.ToDataTable();
// GET A MEMORY STORE FROM A DATATABLE
var wdStore_new = RDFMemoryStore.FromDataTable(wdStore_table);
// ITERATE QUADRUPLES OF A MEMORY STORE WITH FOREACH
foreach (var q in wdStore)
{
Console.WriteLine("Quadruple: " + q);
Console.WriteLine(" Context: " + q.Context);
Console.WriteLine(" Subject: " + q.Subject);
Console.WriteLine(" Predicate: " + q.Predicate);
Console.WriteLine(" Object: " + q.Object);
}
// ITERATE QUADRUPLES OF A MEMORY STORE WITH ENUMERATOR
var quadruplesEnum = wdStore.QuadruplesEnumerator;
while (quadruplesEnum.MoveNext())
{
Console.WriteLine("Quadruple: " + quadruplesEnum.Current);
Console.WriteLine(" Context: " + quadruplesEnum.Current.Context);
Console.WriteLine(" Subject: " + quadruplesEnum.Current.Subject);
Console.WriteLine(" Predicate: " + quadruplesEnum.Current.Predicate);
Console.WriteLine(" Object: " + quadruplesEnum.Current.Object);
}
var nquadsFormat = RDFStoreEnums.RDFFormats.NQuads;
// READ N-QUADS FILE
//var myStore = RDFMemoryStore.FromFile(nquadsFormat, "C:\\file.nq");
// READ N-QUADS STREAM
//var myStore = RDFMemoryStore.FromStream(nquadsFormat, inStream);
// WRITE N-QUADS FILE
wdStoreFilled.ToFile(nquadsFormat, @"C:\TEMP\newfile.nq");
// WRITE N-QUADS STREAM
//myStore.ToStream(nquadsFormat, outStream);
var trixFormat = RDFStoreEnums.RDFFormats.TriX;
// READ TRIX FILE
//var memStore = RDFMemoryStore.FromFile(trixFormat, "C:\\file.trix");
// READ TRIX STREAM
//var memStore = RDFMemoryStore.FromStream(trixFormat, inStream);
// WRITE TRIX FILE
wdStoreFilled.ToFile(trixFormat, @"C:\TEMP\newfile.trix");
// WRITE TRIX STREAM
//myStore.ToStream(trixFormat, outStream);
// CONNECT TO SQLSERVER STORE WITH CONNECTION STRING
//var sqlServer = new RDFSQLServerStore(sqlServerConnectionString);
// CREATE EMPTY FEDERATION
var fed = new RDFFederation();
/*
* // CREATE FEDERATION FROM A LIST OF STORES
* var stores = new List<RDFStore>{ waltDisneyStore, waltDisneyStoreFilled };
* var fedFilled = new RDFFederation();
* foreach(var store in stores)
* {
* fedFilled.AddStore(store);
* }
*/
// ITERATE STORES OF A FEDERATION
foreach (var s in fed)
{
Console.WriteLine("Store: " + s);
Console.WriteLine(" Type: " + s.StoreType);
}
}
public static void Test()
{
RDFFederation federation = new RDFFederation();
StoreManager manager = new StoreManager();
federation.AddStore(manager.Store);
int storeCount = federation.StoresCount;
// ITERATE STORES OF A FEDERATION
foreach (RDFStore store in federation)
{
Console.WriteLine("Store: " + store);
Console.WriteLine(" Type: " + store.StoreType);
}
/*
* Create this graph named "http://www.example.org/graph1"
*
* <http://www.example.org/index.html> <http://purl.org/dc/elements/1.1/creator> <http://www.example.org/staffid/85740> .
* <http://www.example.org/index.html> <http://www.example.org/terms/creation-date> "August 16, 1999" .
* <http://www.example.org/index.html> <http://purl.org/dc/elements/1.1/language> "en" .
*/
string contextUri = "http://www.example.org/graph1";
string subjectUri = "http://www.example.org/index.html";
RDFContext context = new RDFContext(contextUri);
RDFResource subj = new RDFResource(subjectUri);
RDFResource pred1 = new RDFResource("http://purl.org/dc/elements/1.1/creator");
RDFResource obj = new RDFResource("http://www.example.org/staffid/85740");
RDFQuadruple quadruple1 = new RDFQuadruple(context, subj, pred1, obj);
manager.Store.AddQuadruple(quadruple1);
RDFResource pred2 = new RDFResource("http://www.example.org/terms/creation-date");
RDFLiteral lit = new RDFPlainLiteral("August 16, 1999");
RDFQuadruple quadruple2 = new RDFQuadruple(context, subj, pred2, lit);
manager.Store.AddQuadruple(quadruple2);
manager.AddQuadrupleLiteral(contextUri, subjectUri, "http://purl.org/dc/elements/1.1/language", "en");
// It is recommended that N-Quads files have the extension ".nq" (all lowercase) on all platforms.
manager.Store.ToFile(RDFStoreEnums.RDFFormats.NQuads, @"C:\TEMP\index.nq");
manager.Store.ToFile(RDFStoreEnums.RDFFormats.TriX, @"C:\TEMP\index.trix");
List <RDFGraph> graphs = manager.Store.ExtractGraphs();
foreach (RDFGraph graph in graphs)
{
graph.ToFile(RDFModelEnums.RDFFormats.NTriples, @"C:\TEMP\graph1.nt");
graph.ToFile(RDFModelEnums.RDFFormats.RdfXml, @"C:\TEMP\graph1.rdf");
graph.ToFile(RDFModelEnums.RDFFormats.Turtle, @"C:\TEMP\graph1.ttl");
graph.ToFile(RDFModelEnums.RDFFormats.TriX, @"C:\TEMP\graph1.trix");
}
/*
*
* // CREATE VARIABLE
* RDFVariable x = new RDFVariable("x"); // ?X
* RDFVariable y = new RDFVariable("y"); // ?Y
* RDFVariable n = new RDFVariable("n"); // ?N (don’t show in SELECT results)
*
* // CREATE PATTERNS
* RDFResource dogOf = new RDFResource(RDFVocabulary.DC.BASE_URI + "dogOf");
* RDFPattern y_dogOf_x = new RDFPattern(y, dogOf, x); // TRIPLE PATTERN
* RDFPattern n_y_dogOf_x = new RDFPattern(n, y, dogOf, x); // QUADRUPLE PATTERN
*
* // CREATE EMPTY PATTERN GROUP
* RDFPatternGroup pg1 = new RDFPatternGroup("PG1");
*
* // ADD PATTERNS TO PATTERN GROUP
* pg1.AddPattern(y_dogOf_x);
*
* // CREATE PATTERN GROUP FROM A LIST OF PATTERNS
* List<RDFPattern> patterns = new List<RDFPattern>() { y_dogOf_x };
* RDFPatternGroup pg2 = new RDFPatternGroup("PG2", patterns);
*
* // ADD FILTERS TO PATTERN GROUP
* pg1.AddFilter(new RDFSameTermFilter(x, donaldduck));
* pg1.AddFilter(new RDFLangMatchesFilter(n, "it-IT"));
* pg1.AddFilter(new RDFComparisonFilter(
* RDFQueryEnums.RDFComparisonFlavors.LessThan, y, new RDFPlainLiteral("25"))); // ?Y < "25"
*
* // CREATE SELECT QUERY
* RDFSelectQuery selectQuery = new RDFSelectQuery();
*
*
* // ADD PATTERN GROUPS TO QUERY
* selectQuery.AddPatternGroup(pg1);
*
* //y_dogOf_x.Optional();
* //y_dogOf_x.UnionWithNext();
*
* // ADD MODIFIERS TO QUERY
* selectQuery.AddModifier(new RDFDistinctModifier());
* selectQuery.AddModifier(new RDFOrderByModifier(x, RDFQueryEnums.RDFOrderByFlavors.DESC));
* selectQuery.AddModifier(new RDFOrderByModifier(n, RDFQueryEnums.RDFOrderByFlavors.ASC));
* selectQuery.AddModifier(new RDFLimitModifier(100));
* selectQuery.AddModifier(new RDFOffsetModifier(25));
*/
/*
* // APPLY SELECT QUERY TO GRAPH
* RDFSelectQueryResult selectQueryResult1 = selectQuery.ApplyToGraph(graph);
* // APPLY SELECT QUERY TO STORE
* RDFSelectQueryResult selectQueryResult2 = selectQuery.ApplyToStore(store);
* // APPLY SELECT QUERY TO FEDERATION
* RDFSelectQueryResult selectQueryResult3 = selectQuery.ApplyToFederation(federation);
*
*
* // CREATE ASK QUERY
* RDFAskQuery askQuery = new RDFAskQuery();
*
* // APPLY ASK QUERY TO GRAPH
* RDFAskQueryResult askQueryResult1 = askQuery.ApplyToGraph(graph);
* // APPLY ASK QUERY TO STORE
* RDFAskQueryResult askQueryResult2 = askQuery.ApplyToStore(store);
* // APPLY ASK QUERY TO FEDERATION
* RDFAskQueryResult askQueryResult3 = askQuery.ApplyToFederation(federation);
*
*
* // CREATE CONSTRUCT QUERY
* RDFConstructQuery constructQuery = new RDFConstructQuery();
*
* // APPLY CONSTRUCT QUERY TO GRAPH
* RDFConstructQueryResult constructResult1 = constructQuery.ApplyToGraph(graph);
* // APPLY CONSTRUCT QUERY TO STORE
* RDFConstructQueryResult constructResult2 = constructQuery.ApplyToStore(store);
* // APPLY CONSTRUCT QUERY TO FEDERATION
* RDFConstructQueryResult constructResult3 = constructQuery.ApplyToFederation(federation);
*
* // CREATE DESCRIBE QUERY
* RDFDescribeQuery describeQuery = new RDFDescribeQuery();
*
* // APPLY DESCRIBE QUERY TO GRAPH
* RDFDescribeQueryResult describeQueryResult1 = describeQuery.ApplyToGraph(graph);
* // APPLY DESCRIBE QUERY TO STORE
* RDFDescribeQueryResult describeQueryResult2 = describeQuery.ApplyToStore(store);
* // APPLY DESCRIBE QUERY TO FEDERATION
* RDFDescribeQueryResult describeQueryResult3 = describeQuery.ApplyToFederation(federation);
*/
}
/// <summary>
/// Applies the query to the given federation
/// </summary>
public RDFConstructQueryResult ApplyToFederation(RDFFederation federation)
{
if (federation != null) {
this.PatternGroupResultTables.Clear();
this.PatternResultTables.Clear();
RDFConstructQueryResult constructResult = new RDFConstructQueryResult(this.ToString());
if (this.PatternGroups.Any()) {
//Iterate the pattern groups of the query
var fedPatternResultTables = new Dictionary<RDFPatternGroup, List<DataTable>>();
foreach (RDFPatternGroup patternGroup in this.PatternGroups) {
#region TrueFederations
foreach (RDFStore store in federation) {
//Step 1: Evaluate the patterns of the current pattern group on the current store
RDFQueryEngine.EvaluatePatterns(this, patternGroup, store);
//Step 2: Federate the patterns of the current pattern group on the current store
if (!fedPatternResultTables.ContainsKey(patternGroup)) {
fedPatternResultTables.Add(patternGroup, this.PatternResultTables[patternGroup]);
}
else {
fedPatternResultTables[patternGroup].ForEach(fprt =>
fprt.Merge(this.PatternResultTables[patternGroup].Single(prt => prt.TableName.Equals(fprt.TableName, StringComparison.Ordinal)), true, MissingSchemaAction.Add));
}
}
this.PatternResultTables[patternGroup] = fedPatternResultTables[patternGroup];
#endregion
//Step 3: Get the result table of the current pattern group
RDFQueryEngine.CombinePatterns(this, patternGroup);
//Step 4: Apply the filters of the current pattern group to its result table
RDFQueryEngine.ApplyFilters(this, patternGroup);
}
//Step 5: Get the result table of the query
DataTable queryResultTable = RDFQueryEngine.CombineTables(this.PatternGroupResultTables.Values.ToList(), false);
//Step 6: Fill the templates from the result table
DataTable filledResultTable = RDFQueryEngine.FillTemplates(this, queryResultTable);
//Step 7: Apply the modifiers of the query to the result table
constructResult.ConstructResults = RDFQueryEngine.ApplyModifiers(this, filledResultTable);
}
return constructResult;
}
throw new RDFQueryException("Cannot execute CONSTRUCT query because given \"federation\" parameter is null.");
}
public static void EmptyConstructorFederation()
{
RDFFederation fed = new RDFFederation();
Assert.NotNull(fed);
}
public static void AddStoreToFederationTest()
{
RDFFederation fed = StoreBuilder.CreateFederation();
Assert.Equal(1, fed.StoresCount);
}
