private IEnumerable <IProjectionAttribute> CreateDefaultHeader(IProjectionMetadata metadata)
{
ProjectionIdentity identity = this.Identity;
IProcContext context = this.Context;
IEnumerable <IProjectionMetadata> header = this.SelectAttributes(metadata);
if (this.Data != null)
{
using ProjectionReader reader = new ProjectionReader(this.Data.Source, header);
if (reader.Read())
{
foreach (var(valueMetadata, data) in header.Zip(reader.GetData()))
{
yield return(new ProjectionAttribute(identity, context, valueMetadata, data));
}
yield break;
}
}
foreach (IProjectionMetadata attributeMetadata in header)
{
yield return(new ProjectionAttribute(identity, context, attributeMetadata, data: null));
}
}
public ProjectionAttribute(ProjectionIdentity identity, IProcContext context, IProjectionMetadata metadata, IProjectionData data)
{
this.Identity = identity ?? throw ProjectionException.ArgumentNull(nameof(identity), metadata);
this.Context = context ?? throw ProjectionException.ArgumentNull(nameof(context), metadata);
this.Metadata = metadata ?? throw ProjectionException.ArgumentNull(nameof(metadata), metadata);
this.Data = data;
this.Content = SqlContent.Empty;
}
public Projection(ProjectionIdentity identity, IProcContext context, IProjectionMetadata metadata)
{
this.Identity = identity ?? throw ProjectionException.ArgumentNull(nameof(identity), metadata);
this.Context = context ?? throw ProjectionException.ArgumentNull(nameof(context), metadata);
this.Metadata = metadata;
this.Data = ProjectionData.Resolve(identity);
this.Options = ProjectionOptions.Default;
this.Header = this.CreateDefaultHeader(metadata);
}
internal static IProjectionData Resolve(ProjectionIdentity identity)
{
if (identity.Source != null)
{
return(new ProjectionData(identity.Source));
}
return(null);
}
public ProjectionValues(IProcContext context, ProjectionIdentity identity, IEnumerable <IProjection <TItem> > items, int batchIndex = -1)
{
this.Context = context ?? throw new ArgumentNullException(nameof(context));
this.Identity = identity ?? throw new ArgumentNullException(nameof(identity));
this.Items = items ?? throw new ArgumentNullException(nameof(identity));
this.BatchIndex = batchIndex;
if (this.Items is IProjectionValues <TItem> innerValues)
{
this.Items = innerValues.Items;
}
}
public Projection(ProjectionIdentity identity, IProcContext context, IProjectionMetadata metadata)
: base(identity, context, metadata)
{
}