public Expression GetGroupJoin(GroupJoinContext context)
{
// Convert outer condition.
//
var outerParam = Expression.Parameter(context._outerKeyLambda.Body.Type, "o");
var outerKey = context._outerKeyLambda.GetBody(context.Lambda.Parameters[0]);
outerKey = context.Builder.BuildExpression(context, outerKey, false);
// Convert inner condition.
//
var parameters = context.Builder.CurrentSqlParameters
.Select((p,i) => new { p, i })
.ToDictionary(_ => _.p.Expression, _ => _.i);
var paramArray = Expression.Parameter(typeof(object[]), "ps");
var innerKey = context._innerKeyLambda.Body.Transform(e =>
{
int idx;
if (parameters.TryGetValue(e, out idx))
{
return Expression.Convert(
Expression.ArrayIndex(paramArray, Expression.Constant(idx)),
e.Type);
}
return e;
});
// Item reader.
//
var expr = Expression.Call(
null,
MemberHelper.MethodOf(() => Queryable.Where(null, (Expression<Func<TElement,bool>>)null)),
context._innerExpression,
Expression.Lambda<Func<TElement,bool>>(
ExpressionBuilder.Equal(context.Builder.MappingSchema, innerKey, outerParam),
new[] { context._innerKeyLambda.Parameters[0] }));
var lambda = Expression.Lambda<Func<IDataContext,TKey,object[],IQueryable<TElement>>>(
Expression.Convert(expr, typeof(IQueryable<TElement>)),
Expression.Parameter(typeof(IDataContext), "ctx"),
outerParam,
paramArray);
var itemReader = CompiledQuery.Compile(lambda);
return Expression.Call(
null,
MemberHelper.MethodOf(() => GetGrouping(null, null, default(TKey), null)),
new[]
{
ExpressionBuilder.QueryRunnerParam,
Expression.Constant(context.Builder.CurrentSqlParameters),
outerKey,
Expression.Constant(itemReader),
});
}
public Expression GetGroupJoinCall(GroupJoinContext context)
{
var expr = Expression.Call(
null,
MemberHelper.MethodOf(() => Queryable.Where(null, (Expression <Func <T, bool> >)null)),
context._innerExpression,
Expression.Lambda <Func <T, bool> >(
Expression.Equal(
context._innerKeyLambda.Body.Unwrap(),
context._outerKeyLambda.GetBody(context.Lambda.Parameters[0])),
new[] { context._innerKeyLambda.Parameters[0] }));
return(expr);
}
public Expression GetGroupJoin(GroupJoinContext context)
{
// Convert outer condition.
//
var outerParam = Expression.Parameter(context.OuterKeyLambda.Body.Type, "o");
var outerKey = context.OuterKeyLambda.GetBody(context.Lambda.Parameters[0]);
outerKey = context.Builder.BuildExpression(context, outerKey, false);
// Convert inner condition.
//
var parameters = context.Builder.ParametersContext.CurrentSqlParameters
.Select((p, i) => new { p, i })
.ToDictionary(_ => _.p.Expression, _ => _.i);
var paramArray = Expression.Parameter(typeof(object[]), "ps");
var innerKey = context.InnerKeyLambda.Body.Transform(
(parameters, paramArray),
/// <summary>
/// Returns a Slinq that enumerates a group join of the lookup with the specified Slinq using the specified selectors.
/// When the enumeration is complete, the lookup and any values it contains are added to the disposal queue.
/// </summary>
public Slinq <U, GroupJoinContext <U, K, T, T2, C2, P> > GroupJoinAndDispose <U, T2, C2, P>(Slinq <T2, C2> outer,
Func <T2, P, K> outerSelector, Func <T2, Slinq <T, LinkedContext <T> >, P, U> resultSelector, P parameter)
{
return(GroupJoinContext <U, K, T, T2, C2, P> .GroupJoin(this, outer, outerSelector, resultSelector, parameter, true));
}
/// <summary>
/// Returns a Slinq that enumerates a group join of the lookup with the specified Slinq using the specified selectors.
/// Ownership of the lookup and any values it contains is retained by the caller.
/// </summary>
public Slinq <U, GroupJoinContext <U, K, T, T2, C2> > GroupJoinAndKeep <U, T2, C2>(Slinq <T2, C2> outer, Func <T2, K> outerSelector,
Func <T2, Slinq <T, LinkedContext <T> >, U> resultSelector)
{
return(GroupJoinContext <U, K, T, T2, C2> .GroupJoin(this, outer, outerSelector, resultSelector, false));
}
public Expression GetGroupJoin(GroupJoinContext context)
{
// Convert outer condition.
//
var outerParam = Expression.Parameter(context._outerKeyLambda.Body.Type, "o");
var outerKey = context._outerKeyLambda.Body.Convert(
e => e == context._outerKeyLambda.Parameters[0] ? context.Lambda.Parameters[0] : e);
outerKey = context.Builder.BuildExpression(context, outerKey);
// Convert inner condition.
//
var parameters = context.Builder.CurrentSqlParameters
.Select((p, i) => new { p, i })
.ToDictionary(_ => _.p.Expression, _ => _.i);
var paramArray = Expression.Parameter(typeof(object[]), "ps");
var innerKey = context._innerKeyLambda.Body.Convert(e =>
{
int idx;
if (parameters.TryGetValue(e, out idx))
{
return
(Expression.Convert(
Expression.ArrayIndex(paramArray, Expression.Constant(idx)),
e.Type));
}
return(e);
});
// Item reader.
//
// ReSharper disable AssignNullToNotNullAttribute
var expr = Expression.Call(
null,
ReflectionHelper.Expressor <object> .MethodExpressor(_ => Queryable.Where(null, (Expression <Func <TElement, bool> >)null)),
context._innerExpression,
Expression.Lambda <Func <TElement, bool> >(
Expression.Equal(innerKey, outerParam),
new[] { context._innerKeyLambda.Parameters[0] }));
// ReSharper restore AssignNullToNotNullAttribute
var lambda = Expression.Lambda <Func <IDataContext, TKey, object[], IQueryable <TElement> > >(
Expression.Convert(expr, typeof(IQueryable <TElement>)),
Expression.Parameter(typeof(IDataContext), "ctx"),
outerParam,
paramArray);
var itemReader = CompiledQuery.Compile(lambda);
return(Expression.Call(
null,
ReflectionHelper.Expressor <object> .MethodExpressor(_ => GetGrouping(null, null, default(TKey), null)),
new[]
{
ExpressionBuilder.ContextParam,
Expression.Constant(context.Builder.CurrentSqlParameters),
outerKey,
Expression.Constant(itemReader),
}));
}
/// <summary>
/// Returns a Slinq that enumerates a group join of the lookup with the specified Slinq using the specified selectors.
///
/// When the enumeration is complete, the lookup and any values it contains are added to the disposal queue.
/// </summary>
public Slinq <U, GroupJoinContext <U, K, T, T2, C2> > GroupJoinAndDispose <U, T2, C2>(Slinq <T2, C2> outer, DelegateFunc <T2, K> outerSelector, DelegateFunc <T2, Slinq <T, LinkedContext <T> >, U> resultSelector)
{
return(GroupJoinContext <U, K, T, T2, C2> .GroupJoin(this, outer, outerSelector, resultSelector, true));
}
/// <summary>
/// Returns a Slinq that enumerates a group join of the lookup with the specified Slinq using the specified selectors.
///
/// Ownership of the lookup and any values it contains is retained by the caller.
/// </summary>
public Slinq <U, GroupJoinContext <U, K, T, T2, C2, P> > GroupJoinAndKeep <U, T2, C2, P>(Slinq <T2, C2> outer, DelegateFunc <T2, P, K> outerSelector, DelegateFunc <T2, Slinq <T, LinkedContext <T> >, P, U> resultSelector, P parameter)
{
return(GroupJoinContext <U, K, T, T2, C2, P> .GroupJoin(this, outer, outerSelector, resultSelector, parameter, false));
}
