PooledStringBuilder.cs

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using System.Text;
 
namespace System.Reflection.Internal;
 
internal sealed class PooledStringBuilder
{
    public readonly StringBuilder Builder = new StringBuilder();
 
    private readonly ObjectPool<PooledStringBuilder> _pool;
 
    private static readonly ObjectPool<PooledStringBuilder> s_poolInstance = CreatePool();
 
    public int Length => Builder.Length;
 
    private PooledStringBuilder(ObjectPool<PooledStringBuilder> pool)
    {
        _pool = pool;
    }
 
    public void Free()
    {
        StringBuilder builder = Builder;
        if (builder.Capacity <= 1024)
        {
            builder.Clear();
            _pool.Free(this);
        }
    }
 
    public string ToStringAndFree()
    {
        string result = Builder.ToString();
        Free();
        return result;
    }
 
    public static ObjectPool<PooledStringBuilder> CreatePool()
    {
        ObjectPool<PooledStringBuilder> pool = null;
        pool = new ObjectPool<PooledStringBuilder>(() => new PooledStringBuilder(pool), 32);
        return pool;
    }
 
    public static PooledStringBuilder GetInstance()
    {
        return s_poolInstance.Allocate();
    }
}