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LogLevel.cs
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LogLevel.cs
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//
// Copyright (c) 2004-2011 Jaroslaw Kowalski <jaak@jkowalski.net>
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
// * Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
//
// * Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
//
// * Neither the name of Jaroslaw Kowalski nor the names of its
// contributors may be used to endorse or promote products derived from this
// software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
// THE POSSIBILITY OF SUCH DAMAGE.
//
namespace NLog
{
using System;
using NLog.Internal;
/// <summary>
/// Defines available log levels.
/// </summary>
public sealed class LogLevel : IComparable
{
/// <summary>
/// Trace log level.
/// </summary>
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Security", "CA2104:DoNotDeclareReadOnlyMutableReferenceTypes", Justification = "Type is immutable")]
public static readonly LogLevel Trace = new LogLevel("Trace", 0);
/// <summary>
/// Debug log level.
/// </summary>
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Security", "CA2104:DoNotDeclareReadOnlyMutableReferenceTypes", Justification = "Type is immutable")]
public static readonly LogLevel Debug = new LogLevel("Debug", 1);
/// <summary>
/// Info log level.
/// </summary>
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Security", "CA2104:DoNotDeclareReadOnlyMutableReferenceTypes", Justification = "Type is immutable")]
public static readonly LogLevel Info = new LogLevel("Info", 2);
/// <summary>
/// Warn log level.
/// </summary>
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Security", "CA2104:DoNotDeclareReadOnlyMutableReferenceTypes", Justification = "Type is immutable")]
public static readonly LogLevel Warn = new LogLevel("Warn", 3);
/// <summary>
/// Error log level.
/// </summary>
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Security", "CA2104:DoNotDeclareReadOnlyMutableReferenceTypes", Justification = "Type is immutable")]
public static readonly LogLevel Error = new LogLevel("Error", 4);
/// <summary>
/// Fatal log level.
/// </summary>
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Security", "CA2104:DoNotDeclareReadOnlyMutableReferenceTypes", Justification = "Type is immutable")]
public static readonly LogLevel Fatal = new LogLevel("Fatal", 5);
/// <summary>
/// Off log level.
/// </summary>
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Security", "CA2104:DoNotDeclareReadOnlyMutableReferenceTypes", Justification = "Type is immutable")]
public static readonly LogLevel Off = new LogLevel("Off", 6);
private readonly int ordinal;
private readonly string name;
// to be changed into public in the future.
private LogLevel(string name, int ordinal)
{
this.name = name;
this.ordinal = ordinal;
}
/// <summary>
/// Gets the name of the log level.
/// </summary>
public string Name
{
get { return this.name; }
}
internal static LogLevel MaxLevel
{
get { return Fatal; }
}
internal static LogLevel MinLevel
{
get { return Trace; }
}
/// <summary>
/// Gets the ordinal of the log level.
/// </summary>
internal int Ordinal
{
get { return this.ordinal; }
}
/// <summary>
/// Compares two <see cref="LogLevel"/> objects
/// and returns a value indicating whether
/// the first one is equal to the second one.
/// </summary>
/// <param name="level1">The first level.</param>
/// <param name="level2">The second level.</param>
/// <returns>The value of <c>level1.Ordinal == level2.Ordinal</c>.</returns>
public static bool operator ==(LogLevel level1, LogLevel level2)
{
if (ReferenceEquals(level1, null))
{
return ReferenceEquals(level2, null);
}
if (ReferenceEquals(level2, null))
{
return false;
}
return level1.Ordinal == level2.Ordinal;
}
/// <summary>
/// Compares two <see cref="LogLevel"/> objects
/// and returns a value indicating whether
/// the first one is not equal to the second one.
/// </summary>
/// <param name="level1">The first level.</param>
/// <param name="level2">The second level.</param>
/// <returns>The value of <c>level1.Ordinal != level2.Ordinal</c>.</returns>
public static bool operator !=(LogLevel level1, LogLevel level2)
{
if (ReferenceEquals(level1, null))
{
return !ReferenceEquals(level2, null);
}
if (ReferenceEquals(level2, null))
{
return true;
}
return level1.Ordinal != level2.Ordinal;
}
/// <summary>
/// Compares two <see cref="LogLevel"/> objects
/// and returns a value indicating whether
/// the first one is greater than the second one.
/// </summary>
/// <param name="level1">The first level.</param>
/// <param name="level2">The second level.</param>
/// <returns>The value of <c>level1.Ordinal > level2.Ordinal</c>.</returns>
public static bool operator >(LogLevel level1, LogLevel level2)
{
ParameterUtils.AssertNotNull(level1, "level1");
ParameterUtils.AssertNotNull(level2, "level2");
return level1.Ordinal > level2.Ordinal;
}
/// <summary>
/// Compares two <see cref="LogLevel"/> objects
/// and returns a value indicating whether
/// the first one is greater than or equal to the second one.
/// </summary>
/// <param name="level1">The first level.</param>
/// <param name="level2">The second level.</param>
/// <returns>The value of <c>level1.Ordinal >= level2.Ordinal</c>.</returns>
public static bool operator >=(LogLevel level1, LogLevel level2)
{
ParameterUtils.AssertNotNull(level1, "level1");
ParameterUtils.AssertNotNull(level2, "level2");
return level1.Ordinal >= level2.Ordinal;
}
/// <summary>
/// Compares two <see cref="LogLevel"/> objects
/// and returns a value indicating whether
/// the first one is less than the second one.
/// </summary>
/// <param name="level1">The first level.</param>
/// <param name="level2">The second level.</param>
/// <returns>The value of <c>level1.Ordinal < level2.Ordinal</c>.</returns>
public static bool operator <(LogLevel level1, LogLevel level2)
{
ParameterUtils.AssertNotNull(level1, "level1");
ParameterUtils.AssertNotNull(level2, "level2");
return level1.Ordinal < level2.Ordinal;
}
/// <summary>
/// Compares two <see cref="LogLevel"/> objects
/// and returns a value indicating whether
/// the first one is less than or equal to the second one.
/// </summary>
/// <param name="level1">The first level.</param>
/// <param name="level2">The second level.</param>
/// <returns>The value of <c>level1.Ordinal <= level2.Ordinal</c>.</returns>
public static bool operator <=(LogLevel level1, LogLevel level2)
{
ParameterUtils.AssertNotNull(level1, "level1");
ParameterUtils.AssertNotNull(level2, "level2");
return level1.Ordinal <= level2.Ordinal;
}
/// <summary>
/// Gets the <see cref="LogLevel"/> that corresponds to the specified ordinal.
/// </summary>
/// <param name="ordinal">The ordinal.</param>
/// <returns>The <see cref="LogLevel"/> instance. For 0 it returns <see cref="LogLevel.Trace"/>, 1 gives <see cref="LogLevel.Debug"/> and so on.</returns>
public static LogLevel FromOrdinal(int ordinal)
{
switch (ordinal)
{
case 0:
return Trace;
case 1:
return Debug;
case 2:
return Info;
case 3:
return Warn;
case 4:
return Error;
case 5:
return Fatal;
case 6:
return Off;
default:
throw new ArgumentException("Invalid ordinal.");
}
}
/// <summary>
/// Returns the <see cref="T:NLog.LogLevel"/> that corresponds to the supplied <see langword="string" />.
/// </summary>
/// <param name="levelName">The texual representation of the log level.</param>
/// <returns>The enumeration value.</returns>
public static LogLevel FromString(string levelName)
{
if (levelName == null)
{
throw new ArgumentNullException("levelName");
}
if (levelName.Equals("Trace", StringComparison.OrdinalIgnoreCase))
{
return Trace;
}
if (levelName.Equals("Debug", StringComparison.OrdinalIgnoreCase))
{
return Debug;
}
if (levelName.Equals("Info", StringComparison.OrdinalIgnoreCase))
{
return Info;
}
if (levelName.Equals("Warn", StringComparison.OrdinalIgnoreCase))
{
return Warn;
}
if (levelName.Equals("Error", StringComparison.OrdinalIgnoreCase))
{
return Error;
}
if (levelName.Equals("Fatal", StringComparison.OrdinalIgnoreCase))
{
return Fatal;
}
if (levelName.Equals("Off", StringComparison.OrdinalIgnoreCase))
{
return Off;
}
throw new ArgumentException("Unknown log level: " + levelName);
}
/// <summary>
/// Returns a string representation of the log level.
/// </summary>
/// <returns>Log level name.</returns>
public override string ToString()
{
return this.Name;
}
/// <summary>
/// Returns a hash code for this instance.
/// </summary>
/// <returns>
/// A hash code for this instance, suitable for use in hashing algorithms and data structures like a hash table.
/// </returns>
public override int GetHashCode()
{
return this.Ordinal;
}
/// <summary>
/// Determines whether the specified <see cref="System.Object"/> is equal to this instance.
/// </summary>
/// <param name="obj">The <see cref="System.Object"/> to compare with this instance.</param>
/// <returns>
/// Value of <c>true</c> if the specified <see cref="System.Object"/> is equal to this instance; otherwise, <c>false</c>.
/// </returns>
/// <exception cref="T:System.NullReferenceException">
/// The <paramref name="obj"/> parameter is null.
/// </exception>
public override bool Equals(object obj)
{
LogLevel other = obj as LogLevel;
if ((object)other == null)
{
return false;
}
return this.Ordinal == other.Ordinal;
}
/// <summary>
/// Compares the level to the other <see cref="LogLevel"/> object.
/// </summary>
/// <param name="obj">
/// The object object.
/// </param>
/// <returns>
/// A value less than zero when this logger's <see cref="Ordinal"/> is
/// less than the other logger's ordinal, 0 when they are equal and
/// greater than zero when this ordinal is greater than the
/// other ordinal.
/// </returns>
public int CompareTo(object obj)
{
var level = (LogLevel)obj;
return this.Ordinal - level.Ordinal;
}
}
}