Convert to .NET SDK type csproj

QuickLook.Plugin/QuickLook.Plugin.VideoViewer/Mediakit/ILog.cs

@@ -0,0 +1,135 @@
+using System;
+using System.Diagnostics;
+
+namespace WPFMediaKit;
+
+/// <summary>
+/// A logger.
+/// </summary>
+public interface ILog
+{
+    /// <summary>
+    /// If the info level is enabled.
+    /// </summary>
+    bool IsInfoEnabled { get; }
+
+    /// <summary>
+    /// If the debug level is enabled.
+    /// </summary>
+    bool IsDebugEnabled { get; }
+
+    /// <summary>
+    /// Logs the error message with a possible exception.
+    /// </summary>
+    /// <param name="exception">The exception. May be null.</param>
+    /// <param name="message">A (formatted) message.</param>
+    /// <param name="args">Arguments to the formatted message. May be missing.
+    void Error(Exception exception, string message, params object[] args);
+
+    /// <summary>
+    /// Logs the warning message.
+    /// </summary>
+    /// <param name="message">A (formatted) message.</param>
+    /// <param name="args">Arguments to the formatted message. May be missing.
+    void Warn(string message, params object[] args);
+
+    /// <summary>
+    /// Logs the info message.
+    /// </summary>
+    /// <param name="message">A (formatted) message.</param>
+    /// <param name="args">Arguments to the formatted message. May be missing.
+    void Info(string message, params object[] args);
+
+    /// <summary>
+    /// Logs the debug message.
+    /// </summary>
+    /// <param name="message">A (formatted) message.</param>
+    /// <param name="args">Arguments to the formatted message. May be missing.
+    void Debug(string message, params object[] args);
+}
+
+public static class ILogExtensions
+{
+    /// <summary>
+    /// Log the error without an exception.
+    /// </summary>
+    public static void Error(this ILog thiz, string message, params object[] args)
+        => thiz.Error(null, message, args);
+}
+
+/// <summary>
+/// Logging to <see cref="System.Diagnostics.Trace"/>.
+/// </summary>
+public class DebugTraceLog : ILog
+{
+    private string _name;
+
+    public DebugTraceLog(string name)
+    {
+        _name = name;
+    }
+
+    public virtual bool IsInfoEnabled => true;
+
+    public virtual bool IsDebugEnabled => true;
+
+    public virtual void Error(Exception exception, string message, params object[] args)
+    {
+        Trace.TraceError(AddName(message), args);
+        if (exception != null)
+            Trace.TraceError(exception.ToString());
+    }
+
+    public virtual void Warn(string message, params object[] args)
+    {
+        Trace.TraceWarning(AddName(message), args);
+    }
+
+    public virtual void Info(string message, params object[] args)
+    {
+        if (!IsInfoEnabled)
+            return;
+        Trace.TraceInformation(AddName(message), args);
+    }
+
+    public virtual void Debug(string message, params object[] args)
+    {
+        if (!IsDebugEnabled)
+            return;
+        Trace.WriteLine(string.Format(AddName(message), args));
+    }
+
+    protected virtual string AddName(string message)
+    {
+        if (string.IsNullOrEmpty(_name))
+            return message;
+        return _name + " - " + message;
+    }
+}
+
+/// <summary>
+/// No-op implementation of ILog.
+/// </summary>
+public class NullLog : ILog
+{
+    private static NullLog _instance;
+
+    public static NullLog Instance
+        => _instance != null ? _instance : (_instance = new NullLog());
+
+    public bool IsInfoEnabled => false;
+
+    public virtual bool IsDebugEnabled => false;
+
+    public void Error(Exception exception, string message, params object[] args)
+    { }
+
+    public void Info(string message, params object[] args)
+    { }
+
+    public void Debug(string message, params object[] args)
+    { }
+
+    public void Warn(string message, params object[] args)
+    { }
+}