dotnet/src/webdriver/Internal/Logging/TextWriterHandler.cs

// <copyright file="TextWriterHandler.cs" company="Selenium Committers">
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//   http://www.apache.org/licenses/LICENSE-2.0
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using System.IO;

namespace OpenQA.Selenium.Internal.Logging;

/// <summary>
/// Represents a log handler that writes log events to the given text writer.
/// </summary>
public class TextWriterHandler(TextWriter writer) : ILogHandler
{
    // performance trick to avoid expensive Enum.ToString() with fixed length
    private static readonly string[] _levels = { "TRACE", "DEBUG", " INFO", " WARN", "ERROR" };

    /// <summary>
    /// Handles a log event by writing it to the text writer.
    /// </summary>
    /// <param name="logEvent">The log event to handle.</param>
    public void Handle(LogEvent logEvent)
    {
        writer.WriteLine($"{logEvent.Timestamp:HH:mm:ss.fff} {_levels[(int)logEvent.Level]} {logEvent.IssuedBy.Name}: {logEvent.Message}");
    }
}