// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
 
using System.Collections.Generic;
 
namespace Microsoft.ML.Data;
 
[BestFriend]
internal static class SchemaExtensions
{
    public static DataViewSchema MakeSchema(IEnumerable<DataViewSchema.DetachedColumn> columns)
    {
        var builder = new DataViewSchema.Builder();
        builder.AddColumns(columns);
        return builder.ToSchema();
    }
 
    /// <summary>
    /// Legacy method to get the column index.
    /// DO NOT USE: use <see cref="DataViewSchema.GetColumnOrNull"/> instead.
    /// </summary>
    public static bool TryGetColumnIndex(this DataViewSchema schema, string name, out int col)
    {
        col = schema.GetColumnOrNull(name)?.Index ?? -1;
        return col >= 0;
    }
}