internal static StrongEntityAccessor GetEntityAccessor(this IQueryVisitor visitor, Remotion.Linq.Clauses.FromClauseBase sourceExpression)
{
StrongEntityAccessor entityAccessor = null;
if (typeof(IEntity).GetTypeInfo().IsAssignableFrom(sourceExpression.ItemType))
{
sourceExpression = visitor.TransformFromExpression(sourceExpression);
entityAccessor = visitor.Query.FindAllComponents <StrongEntityAccessor>().FirstOrDefault(item => item.SourceExpression.EqualsTo(sourceExpression));
if (entityAccessor == null)
{
Identifier identifier = visitor.Query.FindAllComponents <EntityConstrain>()
.Where(item => (item.TargetExpression.EqualsTo(sourceExpression.FromExpression)) && (item.Value is Identifier))
.Select(item => (Identifier)item.Value)
.FirstOrDefault() ?? new Identifier(visitor.Query.CreateVariableName(sourceExpression.ItemName), sourceExpression.ItemType.FindEntityType());
entityAccessor = new StrongEntityAccessor(identifier, sourceExpression);
entityAccessor.UnboundGraphName = entityAccessor.About;
EntityTypeConstrain constrain = visitor.CreateTypeConstrain(sourceExpression);
if ((constrain != null) && (!entityAccessor.Elements.Contains(constrain)))
{
entityAccessor.Elements.Add(constrain);
}
}
}
return(entityAccessor);
}
internal static EntityTypeConstrain CreateTypeConstrain(this IQueryVisitor visitor, Remotion.Linq.Clauses.FromClauseBase sourceExpression)
{
EntityTypeConstrain result = null;
Type entityType = sourceExpression.ItemType.FindEntityType();
if ((entityType != null) && (entityType != typeof(IEntity)))
{
result = visitor.CreateTypeConstrain(entityType, sourceExpression.FromExpression);
}
return(result);
}