/// <summary>Visits a sub-query expression.</summary>
/// <param name="expression">Expression to be visited.</param>
/// <returns>Expression visited</returns>
protected override System.Linq.Expressions.Expression VisitSubQuery(SubQueryExpression expression)
{
Remotion.Linq.Clauses.FromClauseBase sourceExpression = (Remotion.Linq.Clauses.FromClauseBase)((QuerySourceReferenceExpression)expression.QueryModel.SelectClause.Selector).ReferencedQuerySource;
StrongEntityAccessor entityAccessor = (sourceExpression.FromExpression is System.Linq.Expressions.ConstantExpression ? null : this.GetEntityAccessor(sourceExpression));
if (entityAccessor != null)
{
Query query = _query.CreateSubQuery(entityAccessor.About);
query.AddEntityAccessor(entityAccessor);
EntityQueryModelVisitor queryModelVisitor = new EntityQueryModelVisitor(query, _entityContext);
queryModelVisitor.VisitQueryModel(expression.QueryModel);
_lastComponent = queryModelVisitor.Result;
HandleComponent(_lastComponent);
}
else
{
NonEntityQueryModelVisitor queryModelVisitor = new NonEntityQueryModelVisitor(this, ConstantFromClause);
Stack <IQueryComponentNavigator> currentComponent = _currentComponent;
_currentComponent = new Stack <IQueryComponentNavigator>();
queryModelVisitor.VisitQueryModel(expression.QueryModel);
_currentComponent = currentComponent;
_lastComponent = queryModelVisitor.Result;
HandleComponent(_lastComponent);
}
return(expression);
}
private Model.Query VisitQueryModel(QueryModel queryModel)
{
_modelVisitor = new EntityQueryModelVisitor(_entityContext);
_modelVisitor.VisitQueryModel(queryModel);
return(_queryOptimizer.Optimize(_modelVisitor.Query));
}