/// <summary>
/// Executes the given <paramref name="queryModel"/> as a collection query, i.e. as a query returning objects of type <typeparamref name="T"/>.
/// The query does not end with a scalar result operator, but it can end with a single result operator, for example
/// <see cref="T:Remotion.Linq.Clauses.ResultOperators.SingleResultOperator"/> or <see cref="T:Remotion.Linq.Clauses.ResultOperators.FirstResultOperator"/>. In such a case, the returned enumerable must yield exactly
/// one object (or none if the last result operator allows empty result sets).
/// </summary>
/// <typeparam name="T">The type of the items returned by the query.</typeparam><param name="queryModel">The <see cref="T:Remotion.Linq.QueryModel"/> representing the query to be executed. Analyze this via an
/// <see cref="T:Remotion.Linq.IQueryModelVisitor"/>.</param>
/// <returns>
/// A scalar value of type <typeparamref name="T"/> that represents the query's result.
/// </returns>
public IEnumerable <T> ExecuteCollection <T>(QueryModel queryModel)
{
var sparqlQuery = SparqlGeneratorQueryModelVisitor.GenerateSparqlQuery(_context, queryModel);
return(sparqlQuery.IsInstanceQuery
? _context.ExecuteInstanceQuery <T>(sparqlQuery.InstanceUri, sparqlQuery.TypeUri)
: _context.ExecuteQuery <T>(sparqlQuery));
}
public static SparqlQueryContext GenerateSparqlQuery(EntityContext context, QueryModel queryModel)
{
var visitor = new SparqlGeneratorQueryModelVisitor(context);
visitor.VisitQueryModel(queryModel);
var resultType = queryModel.GetResultType();
if (resultType.IsGenericType)
{
resultType = resultType.GetGenericArguments()[0];
}
var bindType = context.GetImplType(resultType);
bool useDescribe = typeof (IEntityObject).IsAssignableFrom(bindType);
return visitor.GetSparqlQuery(useDescribe);
}
public static SparqlLinqQueryContext GenerateSparqlLinqQuery(EntityContext context, QueryModel queryModel)
{
var visitor = new SparqlGeneratorQueryModelVisitor(context);
visitor.VisitQueryModel(queryModel);
var resultType = queryModel.GetResultType();
if (resultType.IsGenericType)
{
resultType = resultType.GetGenericArguments()[0];
}
var bindType = context.GetImplType(resultType);
bool useConstruct = typeof (IEntityObject).IsAssignableFrom(bindType);
return visitor.GetSparqlQuery(useConstruct);
}