// 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.
 
// This is consumed as 'generated' code in a source package and therefore requires an explicit nullable enable
#nullable enable
 
using System;
using System.Collections.Concurrent;
 
namespace Microsoft.CommonLanguageServerProtocol.Framework;
 
internal abstract class AbstractTypeRefResolver
{
    private readonly ConcurrentDictionary<TypeRef, Type?> _typeRefToTypeMap = [];
 
    public Type? Resolve(TypeRef typeRef)
    {
        if (_typeRefToTypeMap.TryGetValue(typeRef, out var result))
        {
            return result;
        }
 
        result = ResolveCore(typeRef);
        return _typeRefToTypeMap.GetOrAdd(typeRef, result);
    }
 
    protected abstract Type? ResolveCore(TypeRef typeRef);
}