//
// 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.Collections;
namespace NLog.Conditions
{
/// <summary>
/// Condition <b>or</b> expression.
/// </summary>
internal sealed class ConditionOrExpression : ConditionExpression
{
public readonly ConditionExpression Left;
public readonly ConditionExpression Right;
private static object _boxedFalse = false;
private static object _boxedTrue = true;
/// <summary>
/// Creates a new instance of <see cref="ConditionOrExpression"/> and assigns
/// its Left and Right properties;
/// </summary>
/// <param name="left">Left hand side of the OR expression.</param>
/// <param name="right">Right hand side of the OR expression.</param>
public ConditionOrExpression(ConditionExpression left, ConditionExpression right)
{
this.Left = left;
this.Right = right;
}
/// <summary>
/// Evaluates the expression by evaluating <see cref="Left"/> and <see cref="Right"/> recursively.
/// </summary>
/// <param name="context">Evaluation context.</param>
/// <returns>The value of the alternative operator.</returns>
public override object Evaluate(LogEventInfo context)
{
bool bval1 = (bool)Left.Evaluate(context);
if (bval1)
return _boxedTrue;
bool bval2 = (bool)Right.Evaluate(context);
if (bval2)
return _boxedTrue;
return _boxedFalse;
}
/// <summary>
/// Returns a string representation of this expression.
/// </summary>
/// <returns>(Left) or (Right) string</returns>
public override string ToString()
{
return "(" + Left + ") or (" + Right + ")";
}
/// <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)
{
Left.PopulateLayouts(layouts);
Right.PopulateLayouts(layouts);
}
}
}