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ConditionMethodExpression.cs
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ConditionMethodExpression.cs
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//
// Copyright (c) 2004-2019 Jaroslaw Kowalski <jaak@jkowalski.net>, Kim Christensen, Julian Verdurmen
//
// 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.Conditions
{
using System;
using System.Collections.Generic;
using System.Globalization;
using System.Reflection;
using System.Text;
using Common;
/// <summary>
/// Condition method invocation expression (represented by <b>method(p1,p2,p3)</b> syntax).
/// </summary>
internal sealed class ConditionMethodExpression : ConditionExpression
{
private readonly bool _acceptsLogEvent;
private readonly string _conditionMethodName;
/// <summary>
/// Initializes a new instance of the <see cref="ConditionMethodExpression" /> class.
/// </summary>
/// <param name="conditionMethodName">Name of the condition method.</param>
/// <param name="methodInfo"><see cref="MethodInfo"/> of the condition method.</param>
/// <param name="methodParameters">The method parameters.</param>
public ConditionMethodExpression(string conditionMethodName, MethodInfo methodInfo, IEnumerable<ConditionExpression> methodParameters)
{
MethodInfo = methodInfo;
_conditionMethodName = conditionMethodName;
MethodParameters = new List<ConditionExpression>(methodParameters).AsReadOnly();
ParameterInfo[] formalParameters = MethodInfo.GetParameters();
if (formalParameters.Length > 0 && formalParameters[0].ParameterType == typeof(LogEventInfo))
{
_acceptsLogEvent = true;
}
int actualParameterCount = MethodParameters.Count;
if (_acceptsLogEvent)
{
actualParameterCount++;
}
// Count the number of required and optional parameters
CountParmameters(formalParameters, out var requiredParametersCount, out var optionalParametersCount);
if ( !( ( actualParameterCount >= requiredParametersCount ) && ( actualParameterCount <= formalParameters.Length ) ) )
{
string message;
if ( optionalParametersCount > 0 )
{
message = string.Format(
CultureInfo.InvariantCulture,
"Condition method '{0}' requires between {1} and {2} parameters, but passed {3}.",
conditionMethodName,
requiredParametersCount,
formalParameters.Length,
actualParameterCount );
}
else
{
message = string.Format(
CultureInfo.InvariantCulture,
"Condition method '{0}' requires {1} parameters, but passed {2}.",
conditionMethodName,
requiredParametersCount,
actualParameterCount );
}
InternalLogger.Error(message);
throw new ConditionParseException(message);
}
CreateBoundMethod(formalParameters);
}
private void CreateBoundMethod(ParameterInfo[] formalParameters)
{
_lateBoundMethod = Internal.ReflectionHelpers.CreateLateBoundMethod(MethodInfo);
if (formalParameters.Length > MethodParameters.Count)
{
_lateBoundMethodDefaultParameters = new object[formalParameters.Length - MethodParameters.Count];
for (int i = MethodParameters.Count; i < formalParameters.Length; ++i)
{
ParameterInfo param = formalParameters[i];
_lateBoundMethodDefaultParameters[i - MethodParameters.Count] = param.DefaultValue;
}
}
else
{
_lateBoundMethodDefaultParameters = null;
}
}
private static void CountParmameters(ParameterInfo[] formalParameters, out int requiredParametersCount, out int optionalParametersCount)
{
requiredParametersCount = 0;
optionalParametersCount = 0;
foreach (var param in formalParameters)
{
if (param.IsOptional)
++optionalParametersCount;
else
++requiredParametersCount;
}
}
/// <summary>
/// Gets the method info.
/// </summary>
public MethodInfo MethodInfo { get; private set; }
private Internal.ReflectionHelpers.LateBoundMethod _lateBoundMethod;
private object[] _lateBoundMethodDefaultParameters;
/// <summary>
/// Gets the method parameters.
/// </summary>
/// <value>The method parameters.</value>
public IList<ConditionExpression> MethodParameters { get; private set; }
/// <summary>
/// Returns a string representation of the expression.
/// </summary>
/// <returns>
/// A <see cref="T:System.String"/> that represents the condition expression.
/// </returns>
public override string ToString()
{
var sb = new StringBuilder();
sb.Append(_conditionMethodName);
sb.Append("(");
string separator = string.Empty;
//Memory profiling pointed out that using a foreach-loop was allocating
//an Enumerator. Switching to a for-loop avoids the memory allocation.
for (int i = 0; i < MethodParameters.Count; i++)
{
ConditionExpression expr = MethodParameters[i];
sb.Append(separator);
sb.Append(expr);
separator = ", ";
}
sb.Append(")");
return sb.ToString();
}
/// <summary>
/// Evaluates the expression.
/// </summary>
/// <param name="context">Evaluation context.</param>
/// <returns>Expression result.</returns>
protected override object EvaluateNode(LogEventInfo context)
{
int parameterOffset = _acceptsLogEvent ? 1 : 0;
int parameterDefaults = _lateBoundMethodDefaultParameters?.Length ?? 0;
var callParameters = new object[MethodParameters.Count + parameterOffset + parameterDefaults];
//Memory profiling pointed out that using a foreach-loop was allocating
//an Enumerator. Switching to a for-loop avoids the memory allocation.
for (int i = 0; i < MethodParameters.Count; i++)
{
ConditionExpression ce = MethodParameters[i];
callParameters[i + parameterOffset] = ce.Evaluate(context);
}
if (_acceptsLogEvent)
{
callParameters[0] = context;
}
if (_lateBoundMethodDefaultParameters != null)
{
for (int i = _lateBoundMethodDefaultParameters.Length - 1; i >= 0; --i)
{
callParameters[callParameters.Length - i - 1] = _lateBoundMethodDefaultParameters[i];
}
}
return _lateBoundMethod(null, callParameters); // Static-method so object-instance = null
}
}
}