public static IProjectionAttribute ValList(this IProjection projection, Func <IProjectionAttribute, IProjectionAttribute> itemFactory)
{
if (projection.Data == null)
{
throw ProjectionException.ValueNotFound(projection.Metadata);
}
IProjectionMetadata itemMetadata = projection.Metadata?.Item ?? projection.Metadata;
using ProjectionReader reader = new ProjectionReader(projection.Data.Source, new[] { itemMetadata });
IProjectionAttribute attribute = new ProjectionAttribute(projection.Identity, projection.Context, itemMetadata, data: null);
if (reader.Read())
{
IProjectionData data = reader.GetData().First();
attribute = itemFactory(attribute.With(data: data));
}
while (reader.Read())
{
IProjectionData data = reader.GetData().First();
attribute = attribute.Append(", ");
attribute = itemFactory(attribute.With(data: data));
}
return(attribute);
}
public IProjectionAttribute With(IProjectionMetadata metadata = null, IProjectionData data = null, ISqlContent content = null)
{
IProjectionMetadata newMetadata = metadata ?? this.Metadata;
IProjectionData newData = data ?? (metadata != newMetadata ? ProjectionData.Resolve(this.Data, newMetadata) : this.Data);
ISqlContent newContent = content ?? this.Content;
return(new ProjectionAttribute(this, newMetadata, newData, newContent));
}
public IProjection With(IProjectionMetadata metadata = null,
IProjectionData data = null,
IEnumerable <IProjectionAttribute> header = null,
IProjectionOptions options = null)
{
IProjectionMetadata newMetadata = metadata ?? this.Metadata;
IProjectionData newData = data ?? this.Data;
IEnumerable <IProjectionAttribute> newHeader = header ?? (newMetadata != this.Metadata ? this.CreateDefaultHeader(newMetadata) : this.Header);
IProjectionOptions newOptions = options ?? this.Options;
return(new Projection(this, newMetadata, newData, newHeader, newOptions));
}
protected Projection(IProjection projection, IProjectionMetadata metadata, IProjectionData data, IEnumerable <IProjectionAttribute> header, IProjectionOptions options)
{
if (projection == null)
{
throw ProjectionException.ArgumentNull(nameof(projection), metadata: null);
}
this.Identity = projection.Identity;
this.Context = projection.Context;
this.Metadata = metadata ?? throw ProjectionException.ArgumentNull(nameof(metadata), metadata);
this.Data = data;
this.Header = header ?? throw ProjectionException.ArgumentNull(nameof(header), metadata);
this.Options = options ?? throw ProjectionException.ArgumentNull(nameof(options), metadata);
}
internal static IProjectionData Resolve(IProjectionData data, IProjectionMetadata metadata)
{
if (data == null)
{
return(null);
}
else if (data.Source.Metadata == metadata.Relation)
{
return(data);
}
else
{
return(ProjectionReader.Lookup(data.Source, new[] { metadata }).FirstOrDefault());
}
}
public static IProjection Val(this IProjection projection)
{
if (projection.Data == null)
{
throw ProjectionException.ValueNotFound(projection.Metadata);
}
IProjectionData newData = ProjectionData.Resolve(projection.Data, projection.Metadata);
if (newData.Source.Snapshot == null)
{
throw ProjectionException.ValueNotFound(newData.Source);
}
return(projection.With(data: newData));
}
protected ProjectionAttribute(IProjectionAttribute attribute, IProjectionMetadata metadata, IProjectionData data, ISqlContent content)
{
if (attribute == null)
{
throw ProjectionException.ArgumentNull(nameof(attribute), metadata);
}
this.Context = attribute.Context;
this.Identity = attribute.Identity;
this.Metadata = metadata ?? throw ProjectionException.ArgumentNull(nameof(metadata), metadata);
this.Data = data;
this.Content = content ?? throw ProjectionException.ArgumentNull(nameof(content), metadata);
}
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 new IProjection <TModel> With(IProjectionMetadata metadata = null,
IProjectionData data = null,
IEnumerable <IProjectionAttribute> header = null,
IProjectionOptions options = null)
=> new Projection <TModel>(base.With(metadata, data, header, options));
