static IChildProjection LazyChild <K, V>(Expression projector, Scope scope, LookupToken token, SqlPreCommandSimple command)
where K : notnull
{
var proj = ProjectionBuilder.Build <KeyValuePair <K, MList <V> .RowIdElement> >(projector, scope);
return(new LazyChildProjection <K, V>(token, command, proj));
}
public MList <S> LookupRequest <K, S>(LookupToken token, K key, MList <S> field)
where K : notnull
{
Dictionary <K, MList <S> > dictionary = (Dictionary <K, MList <S> >)lookups.GetOrCreate(token, () => (IEnumerable) new Dictionary <K, MList <S> >());
return(dictionary.GetOrCreate(key, () => field != null && field.Count == 0 ? field : new MList <S>()));
}
internal ChildProjectionExpression(ProjectionExpression projection, Expression outerKey, bool isLazyMList, Type type, LookupToken token)
: base(DbExpressionType.ChildProjection, type)
{
this.Projection = projection;
this.OuterKey = outerKey;
this.IsLazyMList = isLazyMList;
this.Token = token;
}
public IEnumerable <S> Lookup <K, S>(LookupToken token, K key)
{
Lookup <K, S> lookup = (Lookup <K, S>)lookups[token];
if (!lookup.Contains(key))
{
return(Enumerable.Empty <S>());
}
else
{
return(lookup[key]);
}
}
static IChildProjection EagerChild <K, V>(Expression projector, Scope scope, LookupToken token, SqlPreCommandSimple command)
{
var proj = ProjectionBuilder.Build <KeyValuePair <K, V> >(projector, scope);
return(new EagerChildProjection <K, V>(token, command, proj));
}
public EagerChildProjection(LookupToken token, SqlPreCommandSimple command, Expression <Func <IProjectionRow, KeyValuePair <K, V> > > projectorExpression)
{
Token = token;
Command = command;
ProjectorExpression = projectorExpression;
}
public LazyChildProjection(LookupToken token, SqlPreCommandSimple command, Expression <Func <IProjectionRow, KeyValuePair <K, MList <V> .RowIdElement> > > projectorExpression)
{
Token = token;
Command = command;
ProjectorExpression = projectorExpression;
}