protected internal override Expression VisitLiteValue(LiteValueExpression lite)
{
var id = Visit(NullifyColumn(lite.Id));
if (id == null)
{
return(Expression.Constant(null, lite.Type));
}
var toStr = Visit(lite.ToStr);
var typeId = lite.TypeId;
var toStringOrNull = toStr ?? Expression.Constant(null, typeof(string));
Expression nothing = Expression.Constant(null, lite.Type);
Expression liteConstructor = null;
if (typeId is TypeEntityExpression)
{
Type type = ((TypeEntityExpression)typeId).TypeValue;
liteConstructor = Expression.Condition(Expression.NotEqual(id, NullId),
Expression.Convert(Lite.NewExpression(type, id, toStringOrNull), lite.Type),
nothing);
}
else if (typeId is TypeImplementedByExpression)
{
TypeImplementedByExpression tib = (TypeImplementedByExpression)typeId;
liteConstructor = tib.TypeImplementations.Aggregate(nothing,
(acum, ti) =>
{
var visitId = Visit(NullifyColumn(ti.Value));
return(Expression.Condition(Expression.NotEqual(visitId, NullId),
Expression.Convert(Lite.NewExpression(ti.Key, visitId, toStringOrNull), lite.Type), acum));
});
}
else if (typeId is TypeImplementedByAllExpression)
{
TypeImplementedByAllExpression tiba = (TypeImplementedByAllExpression)typeId;
var tid = Visit(NullifyColumn(tiba.TypeColumn));
liteConstructor = Expression.Convert(Expression.Call(miLiteCreateParse, Expression.Constant(Schema.Current), tid, id.UnNullify(), toStringOrNull), lite.Type);
}
else
{
liteConstructor = Expression.Condition(Expression.NotEqual(id.Nullify(), NullId),
Expression.Convert(Expression.Call(miLiteCreate, Visit(typeId), id.UnNullify(), toStringOrNull), lite.Type),
nothing);
}
if (toStr != null)
{
return(Expression.Call(retriever, miModifiablePostRetrieving.MakeGenericMethod(typeof(LiteImp)), liteConstructor.TryConvert(typeof(LiteImp))).TryConvert(liteConstructor.Type));
}
else
{
return(Expression.Call(retriever, miRequestLite.MakeGenericMethod(Lite.Extract(lite.Type)), liteConstructor));
}
}
protected internal virtual Expression VisitLiteValue(LiteValueExpression lite)
{
var newTypeId = Visit(lite.TypeId);
var newId = Visit(lite.Id);
var newToStr = Visit(lite.ToStr);
if (newTypeId != lite.TypeId || newId != lite.Id || newToStr != lite.ToStr)
{
return(new LiteValueExpression(lite.Type, newTypeId, newId, newToStr));
}
return(lite);
}
protected internal override Expression VisitLiteValue(LiteValueExpression lite)
{
throw InvalidSqlExpression(lite);
}
protected virtual bool CompareLiteValue(LiteValueExpression a, LiteValueExpression b)
{
return(Compare(a.Id, b.Id) &&
Compare(a.ToStr, b.ToStr) &&
Compare(a.TypeId, b.TypeId));
}
protected virtual Expression VisitLiteValue(LiteValueExpression lite)
{
var newTypeId = Visit(lite.TypeId);
var newId = Visit(lite.Id);
var newToStr = Visit(lite.ToStr);
if (newTypeId != lite.TypeId || newId != lite.Id || newToStr != lite.ToStr)
return new LiteValueExpression(lite.Type, newTypeId, newId, newToStr);
return lite;
}
protected override Expression VisitLiteValue(LiteValueExpression lite)
{
throw InvalidSqlExpression(lite);
}
