public void TestSelectProvidesStatements()
{
SparqlQuery query = new SparqlQuery("SELECT ?s ?p ?o WHERE { ?s ?p ?o . }");
string[] vars = query.GetGlobalScopeVariableNames();
Assert.IsTrue(query.ProvidesStatements());
Assert.AreEqual("s", vars[0]);
Assert.AreEqual("p", vars[1]);
Assert.AreEqual("o", vars[2]);
query = new SparqlQuery("SELECT * WHERE { ?s ?p ?o . }");
vars = query.GetGlobalScopeVariableNames();
Assert.IsTrue(query.ProvidesStatements());
Assert.AreEqual("s", vars[0]);
Assert.AreEqual("p", vars[1]);
Assert.AreEqual("o", vars[2]);
query = new SparqlQuery("SELECT ?s ?p ?o WHERE { ?s ?p ?o . ?x ?y ?z . }");
vars = query.GetGlobalScopeVariableNames();
Assert.IsTrue(query.ProvidesStatements());
Assert.AreEqual("s", vars[0]);
Assert.AreEqual("p", vars[1]);
Assert.AreEqual("o", vars[2]);
query = new SparqlQuery("SELECT * WHERE { ?s ?p ?o . ?x ?y ?z . }");
vars = query.GetGlobalScopeVariableNames();
Assert.IsFalse(query.ProvidesStatements());
Assert.AreEqual(6, vars.Length);
query = new SparqlQuery(@"
PREFIX nie: <http://www.semanticdesktop.org/ontologies/2007/01/19/nie#>
PREFIX artpro: <http://semiodesk.com/artivitypro/1.0/>
SELECT ?s ?p ?o WHERE
{
?s ?p ?o .
?s a artpro:Project .
?s nie:lastModified ?lastModified .
FILTER isIRI(?s)
}
ORDER BY DESC(?lastModified)");
vars = query.GetGlobalScopeVariableNames();
Assert.IsTrue(query.ProvidesStatements());
Assert.AreEqual("s", vars[0]);
Assert.AreEqual("p", vars[1]);
Assert.AreEqual("o", vars[2]);
}
public IEnumerable <T> GetResources <T>() where T : Resource
{
if (_query.ProvidesStatements())
{
return(GenerateResources <T>());
}
else
{
throw new ArgumentException("Error: The given SELECT query cannot be resolved into statements.");
}
}