/// <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);
}
/// <summary>Visits an additional from clause.</summary>
/// <param name="fromClause">From clause to be visited.</param>
/// <param name="queryModel">Query model containing given from clause.</param>
/// <param name="index">Index of the where clause in the query model.</param>
public override void VisitAdditionalFromClause(AdditionalFromClause fromClause, QueryModel queryModel, int index)
{
VisitQuerableFromClause(fromClause, queryModel, index);
StrongEntityAccessor entityAccessor = (fromClause.FromExpression is System.Linq.Expressions.ConstantExpression ? null : _visitor.GetEntityAccessor(fromClause));
if (entityAccessor != null)
{
_query.AddEntityAccessor(entityAccessor);
}
else
{
NonEntityQueryModelVisitor modelVisitor = new NonEntityQueryModelVisitor(_visitor);
modelVisitor.VisitAdditionalFromClause(fromClause, queryModel, index);
if (modelVisitor.From is Identifier)
{
_subject = (Identifier)modelVisitor.From;
}
else if (modelVisitor.From is IExpression)
{
_auxFromComponent = (IExpression)modelVisitor.From;
}
}
base.VisitAdditionalFromClause(fromClause, queryModel, index);
}
/// <summary>Visits an additional from clause.</summary>
/// <param name="fromClause">From clause to be visited.</param>
/// <param name="queryModel">Query model containing given from clause.</param>
/// <param name="index">Index of the where clause in the query model.</param>
public override void VisitAdditionalFromClause(AdditionalFromClause fromClause, QueryModel queryModel, int index)
{
VisitQuerableFromClause(fromClause, queryModel, index);
StrongEntityAccessor entityAccessor = (fromClause.FromExpression is System.Linq.Expressions.ConstantExpression ? null : _visitor.GetEntityAccessor(fromClause));
if (entityAccessor != null)
{
if ((entityAccessor.OwnerQuery == null) && (!_query.Elements.Contains(entityAccessor)))
{
_query.Elements.Add(entityAccessor);
}
}
else
{
NonEntityQueryModelVisitor modelVisitor = new NonEntityQueryModelVisitor(_visitor);
modelVisitor.VisitAdditionalFromClause(fromClause, queryModel, index);
if (modelVisitor.From is Identifier)
{
_subject = (Identifier)modelVisitor.From;
}
else if (modelVisitor.From is IExpression)
{
_auxFromComponent = (IExpression)modelVisitor.From;
}
}
base.VisitAdditionalFromClause(fromClause, queryModel, index);
}