/// <summary>
/// Creates a wrapped version of the cursor
/// </summary>
/// <param name="provider">Channel provider</param>
/// <param name="input">The input cursor</param>
/// <param name="bindings">The bindings object, </param>
public BindingsWrappedRowCursor(IChannelProvider provider, IRowCursor input, ColumnBindingsBase bindings)
: base(provider, input)
{
Ch.CheckValue(input, nameof(input));
Ch.CheckValue(bindings, nameof(bindings));
_bindings = bindings;
}
private static Schema CreateSchema(ColumnBindingsBase inputBindings)
{
Contracts.CheckValue(inputBindings, nameof(inputBindings));
var builder = new SchemaBuilder();
for (int i = 0; i < inputBindings.ColumnCount; i++)
{
var meta = new MetadataBuilder();
foreach (var kvp in inputBindings.GetMetadataTypes(i))
{
var getter = Utils.MarshalInvoke(GetMetadataGetterDelegate <int>, kvp.Value.RawType, inputBindings, i, kvp.Key);
meta.Add(kvp.Key, kvp.Value, getter);
}
builder.AddColumn(inputBindings.GetColumnName(i), inputBindings.GetColumnType(i), meta.GetMetadata());
}
return(builder.GetSchema());
}
private static Delegate GetMetadataGetterDelegate <TValue>(ColumnBindingsBase bindings, int col, string kind)
{
ValueGetter <TValue> getter = (ref TValue value) => bindings.GetMetadata(kind, col, ref value);
return(getter);
}
