public Cursor(ZipDataView parent, DataViewRowCursor[] srcCursors, Func <int, bool> predicate)
: base(parent._host)
{
Ch.AssertNonEmpty(srcCursors);
Ch.AssertValue(predicate);
_cursors = srcCursors;
_zipBinding = parent._zipBinding;
_isColumnActive = Utils.BuildArray(_zipBinding.ColumnCount, predicate);
}
public Cursor(ZipDataView parent, RowCursor[] srcCursors, Func <int, bool> predicate)
: base(parent._host)
{
Ch.AssertNonEmpty(srcCursors);
Ch.AssertValue(predicate);
_cursors = srcCursors;
_compositeSchema = parent._compositeSchema;
_isColumnActive = Utils.BuildArray(_compositeSchema.ColumnCount, predicate);
}
/// <summary>
/// Create a new data view which is obtained by appending all columns of all the source data views.
/// If the data views are of different length, the resulting data view will have the length equal to the
/// length of the shortest source.
/// </summary>
/// <param name="env">The host environment to use.</param>
/// <param name="sources">A non-empty collection of data views to zip together.</param>
/// <returns>The resulting data view.</returns>
public static IDataView Zip(this IHostEnvironment env, IEnumerable <IDataView> sources)
{
Contracts.CheckValue(env, nameof(env));
env.CheckValue(sources, nameof(sources));
return(ZipDataView.Create(env, sources));
}