public Implementations FindImplementations(PropertyRoute route)
{
if (route.PropertyRouteType == PropertyRouteType.LiteEntity)
{
route = route.Parent;
}
Type type = route.RootType;
if (!Tables.ContainsKey(type))
{
return(Schema.Current.Settings.GetImplementations(route));
}
Field field = TryFindField(Table(type), route.Members);
//if (field == null)
// return Implementations.ByAll;
FieldReference refField = field as FieldReference;
if (refField != null)
{
return(Implementations.By(refField.FieldType.CleanType()));
}
FieldImplementedBy ibField = field as FieldImplementedBy;
if (ibField != null)
{
return(Implementations.By(ibField.ImplementationColumns.Keys.ToArray()));
}
FieldImplementedByAll ibaField = field as FieldImplementedByAll;
if (ibaField != null)
{
return(Implementations.ByAll);
}
Implementations?implementations = CalculateExpressionImplementations(route);
if (implementations != null)
{
return(implementations.Value);
}
var ss = Schema.Current.Settings;
if (route.Follow(r => r.Parent)
.TakeWhile(t => t.PropertyRouteType != PropertyRouteType.Root)
.Any(r => ss.FieldAttribute <IgnoreAttribute>(r) != null))
{
var ib = ss.FieldAttribute <ImplementedByAttribute>(route);
var iba = ss.FieldAttribute <ImplementedByAllAttribute>(route);
return(Implementations.TryFromAttributes(route.Type.CleanType(), route, ib, iba) ?? Implementations.By());
}
throw new InvalidOperationException("Impossible to determine implementations for {0}".FormatWith(route, typeof(IEntity).Name));
}
protected override Expression VisitTypeBinary(TypeBinaryExpression b)
{
var f = GetField(b.Expression);
FieldReference fr = f as FieldReference;
if (fr != null)
{
if (b.TypeOperand.IsAssignableFrom(fr.FieldType))
{
sb.Append(fr.Name.SqlEscape() + " IS NOT NULL");
}
else
{
throw new InvalidOperationException("A {0} will never be {1}".FormatWith(fr.FieldType.TypeName(), b.TypeOperand.TypeName()));
}
return(b);
}
FieldImplementedBy fib = f as FieldImplementedBy;
if (fib != null)
{
var imp = fib.ImplementationColumns.Where(kvp => b.TypeOperand.IsAssignableFrom(kvp.Key));
if (imp.Any())
{
sb.Append(imp.ToString(kvp => kvp.Value.Name.SqlEscape() + " IS NOT NULL", " OR "));
}
else
{
throw new InvalidOperationException("No implementation ({0}) will never be {1}".FormatWith(fib.ImplementationColumns.Keys.ToString(t => t.TypeName(), ", "), b.TypeOperand.TypeName()));
}
return(b);
}
throw new NotSupportedException("'is' only works with ImplementedBy or Reference fields");
}
