/// <summary>Visits a where clause.</summary>
/// <param name="whereClause">Where 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 VisitWhereClause(WhereClause whereClause, Remotion.Linq.QueryModel queryModel, int index)
{
_visitor.ConstantFromClause = _auxFromComponent;
_visitor.Visit(whereClause.Predicate);
QueryComponent queryComponent = _visitor.RetrieveComponent();
IQueryComponentNavigator queryComponentNavigator = queryComponent.GetQueryComponentNavigator();
if (queryComponentNavigator != null)
{
queryComponentNavigator.ReplaceComponent(Identifier.Current, _subject);
}
if (queryComponent is QueryElement)
{
if ((!(queryComponent is EntityConstrain)) && (!_query.Elements.Contains((QueryElement)queryComponent)))
{
_query.Elements.Add((QueryElement)queryComponent);
}
}
else if (!_query.FindAllComponents <Filter>().Any(item => item.Expression == queryComponent))
{
Filter filter = new Filter((IExpression)queryComponent);
StrongEntityAccessor targetEntityAccessor = null;
if ((_subject != _mainFromComponent.About) && (queryComponentNavigator.Contains(_subject)))
{
targetEntityAccessor = (from entityAccessor in _query.FindAllComponents <StrongEntityAccessor>()
from constrain in entityAccessor.FindAllComponents <EntityConstrain>()
where (constrain.GetType() == typeof(EntityConstrain)) && (_subject.Equals(constrain.Value))
select entityAccessor).FirstOrDefault();
}
if (targetEntityAccessor == null)
{
IEnumerable <StrongEntityAccessor> targetEntityAccessorExression = _query.Elements.OfType <StrongEntityAccessor>();
if ((_query.IsSubQuery) || (whereClause.Predicate is Remotion.Linq.Clauses.Expressions.SubQueryExpression))
{
targetEntityAccessorExression = targetEntityAccessorExression.Except(new StrongEntityAccessor[] { _query.Elements.OfType <StrongEntityAccessor>().LastOrDefault() });
}
targetEntityAccessor = targetEntityAccessorExression.LastOrDefault() ?? _mainFromComponent;
}
if ((!targetEntityAccessor.Elements.Contains(queryComponent)) && (!targetEntityAccessor.Elements.Contains(filter)))
{
targetEntityAccessor.Elements.Add(filter);
}
}
_auxFromComponent = null;
base.VisitWhereClause(whereClause, queryModel, index);
}
internal static bool Contains(this IQueryComponentNavigator navigator, IQueryComponent component)
{
bool result = navigator.ContainsComponent(component);
if (!result)
{
foreach (IQueryComponent childComponent in navigator.GetComponents())
{
IQueryComponentNavigator childNavigator = childComponent.GetQueryComponentNavigator();
if (childNavigator != null)
{
bool localResult = childNavigator.Contains(component);
if (localResult)
{
result = localResult;
break;
}
}
}
}
return(result);
}