//
// 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.IO;
using System.Text;
using System.Reflection;
using System.Xml.Serialization;
namespace NLog.Conditions
{
/// <summary>
/// Condition method invocation expression (represented by <b>method(p1,p2,p3)</b> syntax).
/// </summary>
internal sealed class ConditionMethodExpression : ConditionExpression
{
private string _name;
private ConditionExpressionCollection _parameters;
private MethodInfo _methodInfo;
private bool _acceptsLogEvent;
public ConditionMethodExpression() {}
public ConditionMethodExpression(string name, ConditionExpressionCollection parameters)
{
_name = name;
_parameters = parameters;
_methodInfo = ConditionMethodFactory.CreateConditionMethod(_name);
if (_methodInfo == null)
{
Internal.InternalLogger.Error("Condition method: '{0}' not found", name);
throw new ArgumentException("Condition method not found: '" + name + "'");
}
ParameterInfo[] formalParameters = _methodInfo.GetParameters();
if (formalParameters.Length >= 0)
{
_acceptsLogEvent = (formalParameters[0].ParameterType == typeof(LogEventInfo));
}
else
{
_acceptsLogEvent = false;
}
int actualParameterCount = _parameters.Count;
if (_acceptsLogEvent)
actualParameterCount++;
if (formalParameters.Length != actualParameterCount)
{
Internal.InternalLogger.Error("Condition method: '{0}' expects {1} parameters. Passed {2}", name, formalParameters.Length, actualParameterCount);
throw new ConditionParseException(String.Format("Condition method: '{0}' expects {1} parameters. Passed {2}", name, formalParameters.Length, actualParameterCount));
}
}
public override object Evaluate(LogEventInfo context)
{
object[] callParameters;
int parameterOffset = _acceptsLogEvent ? 1 : 0;
callParameters = new object[_parameters.Count + parameterOffset];
for (int i = 0; i < _parameters.Count; ++i)
{
callParameters[i + parameterOffset] = _parameters[i].Evaluate(context);
}
if (_acceptsLogEvent)
callParameters[0] = context;
try
{
return _methodInfo.Invoke(null, callParameters);
}
catch (Exception ex)
{
Internal.InternalLogger.Error("Error: {0}", ex);
return "";
}
}
public override string ToString()
{
StringBuilder sb = new StringBuilder();
sb.Append(_name);
sb.Append("(");
for (int i = 0; i < _parameters.Count; ++i)
{
if (i != 0)
sb.Append(",");
sb.Append(_parameters[i]);
}
sb.Append(")");
return sb.ToString();
}
/// <summary>
/// Adds all layouts used by this expression to the specified collection.
/// </summary>
/// <param name="layouts">The collection to add layouts to.</param>
public override void PopulateLayouts(LayoutCollection layouts)
{
foreach (ConditionExpression expr in _parameters)
{
expr.PopulateLayouts(layouts);
}
}
}
}