static IChildProjection BuildChild(ChildProjectionExpression childProj)
{
var proj = childProj.Projection;
Type type = proj.UniqueFunction == null?proj.Type.ElementType() !: proj.Type;
if (!type.IsInstantiationOf(typeof(KeyValuePair <,>)))
{
throw new InvalidOperationException("All child projections should create KeyValuePairs");
}
Scope scope = new Scope(
alias: proj.Select.Alias,
positions: proj.Select.Columns.Select((c, i) => new { c.Name, i }).ToDictionary(p => p.Name !, p => p.i) /*CSBUG*/
);
var types = type.GetGenericArguments();
var command = QueryFormatter.Format(proj.Select);
if (childProj.IsLazyMList)
{
types[1] = types[1].GetGenericArguments()[0];
return(giLazyChild.GetInvoker(types)(proj.Projector, scope, childProj.Token, command));
}
else
{
return(giEagerChild.GetInvoker(types)(proj.Projector, scope, childProj.Token, command));
}
}
protected internal virtual Expression VisitChildProjection(ChildProjectionExpression child)
{
ProjectionExpression proj = (ProjectionExpression)this.Visit(child.Projection);
Expression key = this.Visit(child.OuterKey);
if (proj != child.Projection || key != child.OuterKey)
{
return(new ChildProjectionExpression(proj, key, child.IsLazyMList, child.Type, child.Token));
}
return(child);
}
protected internal override Expression VisitChildProjection(ChildProjectionExpression child)
{
Expression key = this.Visit(child.OuterKey);
ProjectionExpression proj = (ProjectionExpression)UnusedColumnRemover.Remove(child.Projection);
if (proj != child.Projection || key != child.OuterKey)
{
return(new ChildProjectionExpression(proj, key, child.IsLazyMList, child.Type, child.Token));
}
return(child);
}
protected Expression VisitMListChildProjection(ChildProjectionExpression child, MemberExpression field)
{
Expression outer = Visit(child.OuterKey);
if (outer != child.OuterKey)
{
child = new ChildProjectionExpression(child.Projection, outer, child.IsLazyMList, child.Type, child.Token);
}
return(scope.LookupMList(row, child, field));
}
protected internal override Expression VisitChildProjection(ChildProjectionExpression child)
{
Expression outer = Visit(child.OuterKey);
if (outer != child.OuterKey)
{
child = new ChildProjectionExpression(child.Projection, outer, child.IsLazyMList, child.Type, child.Token);
}
return(scope.LookupEager(row, child));
}
protected internal override Expression VisitChildProjection(ChildProjectionExpression child)
{
var result = base.VisitChildProjection(child);
if (!child.IsLazyMList)
{
list.Add(child);
}
return(result);
}
public Expression LookupEager(Expression row, ChildProjectionExpression cProj)
{
if (cProj.IsLazyMList)
{
throw new InvalidOperationException("IsLazyMList not expected at this stage");
}
Type type = cProj.Projection.UniqueFunction == null?cProj.Type.ElementType() : cProj.Type;
MethodInfo mi = miLookup.MakeGenericMethod(cProj.OuterKey.Type, type);
Expression call = Expression.Call(row, mi, Expression.Constant(cProj.Token), cProj.OuterKey);
if (cProj.Projection.UniqueFunction != null)
{
throw new InvalidOperationException("Eager ChildProyection with UniqueFunction '{0}' not expected at this stage".FormatWith(cProj.Projection.UniqueFunction));
}
return(call);
}
public Expression LookupMList(Expression row, ChildProjectionExpression cProj, MemberExpression field)
{
if (!cProj.IsLazyMList)
{
throw new InvalidOperationException("Not IsLazyMList not expected at this stage");
}
if (!cProj.Type.IsMList())
{
throw new InvalidOperationException("Lazy ChildProyection of type '{0}' instead of MList".FormatWith(cProj.Type.TypeName()));
}
if (cProj.Projection.UniqueFunction != null)
{
throw new InvalidOperationException("Lazy ChildProyection with UniqueFunction '{0}'".FormatWith(cProj.Projection.UniqueFunction));
}
MethodInfo mi = miLookupRequest.MakeGenericMethod(cProj.OuterKey.Type, cProj.Type.ElementType());
return(Expression.Call(row, mi, Expression.Constant(cProj.Token), cProj.OuterKey, field));
}
protected internal override Expression VisitChildProjection(ChildProjectionExpression child)
{
return(child);
}
protected internal override Expression VisitChildProjection(ChildProjectionExpression child)
{
throw InvalidSqlExpression(child);
}
private bool CompareChildProjection(ChildProjectionExpression a, ChildProjectionExpression b)
{
return(Compare(a.Projection, b.Projection) &&
Compare(a.OuterKey, b.OuterKey) &&
a.IsLazyMList == b.IsLazyMList);
}