private ListTarget GetListTarget(ListResult result, IBindingMetadata metadata, KeyReader joinKey)
{
int bufferIndex = this.Buffer.GetListIndex(metadata, joinKey?.Reference);
metadata = joinKey?.Target ?? metadata;
ListTarget target = result.Targets.FirstOrDefault(t => t.Index == bufferIndex);
if (target != null)
{
return(target);
}
target = new ListTarget()
{
Index = bufferIndex,
Variable = this.GetListVariable(metadata, joinKey),
};
if (joinKey == null && metadata.HasFlag(BindingMetadataFlags.Item))
{
target.NewList = target.NewTarget = metadata.Parent.Composition?.Construct ?? throw BindingException.InvalidConstructor(metadata.Parent);
target.AddMethod = metadata.Parent.Composition.Add;
}
if (joinKey != null)
{
target.NewTarget = Expression.New(target.Variable.Type);
}
if (target.NewTarget != null)
{
result.Targets.Add(target);
}
return(target);
}
private ParameterExpression GetListVariable(IBindingMetadata metadata, KeyReader joinKey)
{
if (joinKey != null)
{
Type dictType = typeof(Dictionary <,>).MakeGenericType(joinKey.KeyType, typeof(ElasticArray));
return(this.GetNamedVariable(dictType, metadata.Identity));
}
else if (metadata.HasFlag(BindingMetadataFlags.Item))
{
Type listType = metadata.Parent.Composition?.Construct?.Type ?? throw BindingException.InvalidConstructor(metadata.Parent);
return(this.GetNamedVariable(listType, metadata.Identity));
}
return(null);
}
