// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
using System.Collections.Generic;
using System.Text;
 
#pragma warning disable CA1716
namespace Microsoft.Gen.Shared;
#pragma warning restore CA1716
 
#if !SHARED_PROJECT
[System.Diagnostics.CodeAnalysis.ExcludeFromCodeCoverage]
#endif
internal sealed class StringBuilderPool
{
    private readonly Stack<StringBuilder> _builders = new();
 
    public StringBuilder GetStringBuilder()
    {
        const int DefaultStringBuilderCapacity = 1024;
 
        if (_builders.Count == 0)
        {
            return new StringBuilder(DefaultStringBuilderCapacity);
        }
 
        var sb = _builders.Pop();
        _ = sb.Clear();
        return sb;
    }
 
    public void ReturnStringBuilder(StringBuilder sb)
    {
        _builders.Push(sb);
    }
}