public override IBuildContext GetContext(Expression expression, int level, BuildInfo buildInfo)
{
if (expression == null && buildInfo != null)
{
if (buildInfo.Parent is SelectManyBuilder.SelectManyContext)
{
var sm = (SelectManyBuilder.SelectManyContext)buildInfo.Parent;
var ctype = typeof(ContextHelper <>).MakeGenericType(_key.Lambda.Parameters[0].Type);
var helper = (IContextHelper)Activator.CreateInstance(ctype);
var expr = helper.GetContext(
Builder.MappingSchema,
Sequence.Expression,
_key.Lambda.Parameters[0],
Expression.PropertyOrField(sm.Lambda.Parameters[0], "Key"),
_key.Lambda.Body);
return(Builder.BuildSequence(new BuildInfo(buildInfo, expr)));
}
//if (buildInfo.Parent == this)
{
var ctype = typeof(ContextHelper <>).MakeGenericType(_key.Lambda.Parameters[0].Type);
var helper = (IContextHelper)Activator.CreateInstance(ctype);
var expr = helper.GetContext(
Builder.MappingSchema,
_sequenceExpr,
_key.Lambda.Parameters[0],
Expression.PropertyOrField(buildInfo.Expression, "Key"),
_key.Lambda.Body);
var ctx = Builder.BuildSequence(new BuildInfo(buildInfo, expr));
ctx.SelectQuery.Properties.Add(Tuple.Create("from_group_by", SelectQuery));
return(ctx);
}
//return this;
}
if (level != 0)
{
var levelExpression = expression.GetLevelExpression(Builder.MappingSchema, level);
if (levelExpression.NodeType == ExpressionType.MemberAccess)
{
var ma = (MemberExpression)levelExpression;
if (ma.Member.Name == "Key" && ma.Member.DeclaringType == _groupingType)
{
return(ReferenceEquals(levelExpression, expression) ?
_key.GetContext(null, 0, buildInfo) :
_key.GetContext(expression, level + 1, buildInfo));
}
}
}
throw new NotImplementedException();
}
public override IBuildContext?GetContext(Expression?expression, int level, BuildInfo buildInfo)
{
if (expression == null && buildInfo != null)
{
if (buildInfo.Parent is SelectManyBuilder.SelectManyContext sm)
{
var expr = MakeSubQueryExpression(
Builder.MappingSchema,
Sequence.Expression !,
_key.Lambda.Parameters[0],
ExpressionHelper.PropertyOrField(sm.Lambda.Parameters[0], "Key"),
_key.Lambda.Body);
return(Builder.BuildSequence(new BuildInfo(buildInfo, expr)));
}
//if (buildInfo.Parent == this)
{
var expr = MakeSubQueryExpression(
Builder.MappingSchema,
_sequenceExpr,
_key.Lambda.Parameters[0],
ExpressionHelper.PropertyOrField(buildInfo.Expression, "Key"),
_key.Lambda.Body);
var ctx = Builder.BuildSequence(new BuildInfo(buildInfo, expr));
ctx.SelectQuery.Properties.Add(Tuple.Create("from_group_by", SelectQuery));
return(ctx);
}
//return this;
}
if (level != 0)
{
var levelExpression = expression !.GetLevelExpression(Builder.MappingSchema, level);
if (levelExpression.NodeType == ExpressionType.MemberAccess)
{
var ma = (MemberExpression)levelExpression;
if (ma.Member.Name == "Key" && ma.Member.DeclaringType == _groupingType)
{
return(ReferenceEquals(levelExpression, expression) ?
_key.GetContext(null, 0, buildInfo !) :
_key.GetContext(expression, level + 1, buildInfo !));
}
}
}
if (buildInfo != null && level == 0 && expression?.NodeType == ExpressionType.Parameter)
{
var expr = MakeSubQueryExpression(
Builder.MappingSchema,
_sequenceExpr,
_key.Lambda.Parameters[0],
ExpressionHelper.PropertyOrField(buildInfo.Expression, "Key"),
_key.Lambda.Body);
expr = TypeHelper.MakeMethodCall(Methods.Enumerable.Select, expr, Element.Lambda);
var ctx = Builder.BuildSequence(new BuildInfo(buildInfo, expr));
ctx.SelectQuery.Properties.Add(Tuple.Create("from_group_by", SelectQuery));
return(ctx);
}
throw new NotImplementedException();
}