File: NotFilter.cs

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// ****************************************************************
// Copyright 2007, Charlie Poole
// This is free software licensed under the NUnit license. You may
// obtain a copy of the license at http://nunit.org/?p=license&r=2.4
// ****************************************************************
using System;

namespace NUnit.Core.Filters
{
	/// <summary>
	/// NotFilter negates the operation of another filter
	/// </summary>
	[Serializable]
	public class NotFilter : TestFilter
	{
		ITestFilter baseFilter;

		/// <summary>
		/// Construct a not filter on another filter
		/// </summary>
		/// <param name="baseFilter">The filter to be negated</param>
		public NotFilter( ITestFilter baseFilter)
		{
			this.baseFilter = baseFilter;
		}

		/// <summary>
		/// Gets the base filter
		/// </summary>
		public ITestFilter BaseFilter
		{
			get { return baseFilter; }
		}

		/// <summary>
		/// Check whether the filter matches a test
		/// </summary>
		/// <param name="test">The test to be matched</param>
		/// <returns>True if it matches, otherwise false</returns>
		public override bool Match( ITest test )
		{
			return test.RunState != RunState.Explicit && !baseFilter.Pass( test );
		}

		/// <summary>
		/// Determine whether any descendant of the test matches the filter criteria.
		/// </summary>
		/// <param name="test">The test to be matched</param>
		/// <returns>True if at least one descendant matches the filter criteria</returns>
		protected override bool MatchDescendant(ITest test)
		{
			if (!test.IsSuite || test.Tests == null || test.RunState == RunState.Explicit)
				return false;

			foreach (ITest child in test.Tests)
			{
				if (Match(child) || MatchDescendant(child))
					return true;
			}

			return false;
		}	
	}
}