//
// Copyright (c) 2004-2006 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.
//
using System;
using System.Text;
using System.Collections;
using System.Reflection;
using System.Globalization;
using NLog.Internal;
namespace NLog
{
/// <summary>
/// A factory of condition methods. Retrieves condition MethodInfos based on their names.
/// </summary>
public sealed class ConditionMethodFactory
{
private static MethodInfoDictionary _conditionMethods = new MethodInfoDictionary();
static ConditionMethodFactory()
{
foreach (Assembly a in ExtensionUtils.GetExtensionAssemblies())
{
AddConditionMethodsFromAssembly(a, "");
}
}
private ConditionMethodFactory(){}
/// <summary>
/// Removes all condition method information from the factory.
/// </summary>
public static void Clear()
{
_conditionMethods.Clear();
}
/// <summary>
/// Scans the specified assembly for types marked with <see cref="ConditionMethodsAttribute" /> and adds
/// them to the factory. Optionally it prepends the specified text to layout renderer names to avoid
/// naming collisions.
/// </summary>
/// <param name="theAssembly">The assembly to be scanned for layout renderers.</param>
/// <param name="prefix">The prefix to be prepended to layout renderer names.</param>
public static void AddConditionMethodsFromAssembly(Assembly theAssembly, string prefix)
{
try
{
InternalLogger.Debug("AddLogEventConditionsFromAssembly('{0}')", theAssembly.FullName);
foreach (Type t in theAssembly.GetTypes())
{
if (t.IsDefined(typeof(ConditionMethodsAttribute), false))
{
foreach (MethodInfo mi in t.GetMethods(BindingFlags.Public | BindingFlags.Static))
{
ConditionMethodAttribute[] malist = (ConditionMethodAttribute[])mi.GetCustomAttributes(typeof(ConditionMethodAttribute), false);
foreach (ConditionMethodAttribute ma in malist)
{
AddConditionMethod(ma.Name, mi);
}
}
}
}
}
catch (Exception ex)
{
InternalLogger.Error("Failed to add LogEventConditions from '" + theAssembly.FullName + "': {0}", ex);
}
}
private static void AddDefaultConditionMethods()
{
AddConditionMethodsFromAssembly(typeof(ConditionMethodFactory).Assembly, String.Empty);
}
/// <summary>
/// Registers the specified condition method under a specified name.
/// </summary>
/// <param name="name">Name of the condition method.</param>
/// <param name="mi"><see cref="MethodInfo" /> of the method to be registered.</param>
public static void AddConditionMethod(string name, MethodInfo mi)
{
InternalLogger.Debug("AddConditionMethods('{0}','{1}')", name, mi);
_conditionMethods[name.ToLower(CultureInfo.InvariantCulture)] = mi;
}
/// <summary>
/// Returns the <see cref="MethodInfo"/> for the specified condition method.
/// </summary>
/// <param name="name">Name of the condition method.</param>
/// <returns><see cref="MethodInfo"/> object that represents the condition method.</returns>
public static MethodInfo CreateConditionMethod(string name)
{
return _conditionMethods[name.ToLower(CultureInfo.InvariantCulture)];
}
}
}