// 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.
 
#nullable disable
 
using System;
using System.Collections.Generic;
using System.Collections.Immutable;
 
namespace Roslyn.Utilities
{
    internal readonly struct ObjectBinderSnapshot
    {
        private readonly Dictionary<Type, int> _typeToIndex;
        private readonly ImmutableArray<Type> _types;
        private readonly ImmutableArray<Func<ObjectReader, IObjectWritable>> _typeReaders;
 
        public ObjectBinderSnapshot(
            Dictionary<Type, int> typeToIndex,
            List<Type> types,
            List<Func<ObjectReader, IObjectWritable>> typeReaders)
        {
            _typeToIndex = new Dictionary<Type, int>(typeToIndex);
            _types = types.ToImmutableArray();
            _typeReaders = typeReaders.ToImmutableArray();
        }
 
        public int GetTypeId(Type type)
            => _typeToIndex[type];
 
        public Type GetTypeFromId(int typeId)
            => _types[typeId];
 
        public Func<ObjectReader, IObjectWritable> GetTypeReaderFromId(int typeId)
            => _typeReaders[typeId];
    }
}