//
// ConditionNotExpression.cs
//
// Author:
//   Marek Sieradzki (marek.sieradzki@gmail.com)
// 
// (C) 2006 Marek Sieradzki
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.



using System;
using System.Xml;

namespace Microsoft.Build.BuildEngine {
	internal sealed class ConditionNotExpression : ConditionExpression {
	
		readonly ConditionExpression expression;
		
		public ConditionNotExpression (ConditionExpression expression)
		{
			this.expression = expression;
		}
		
		public override  bool BoolEvaluate (IExpressionContext context)
		{
			return !(expression.BoolEvaluate (context));
		}
		
		
		public override float NumberEvaluate (IExpressionContext context)
		{
			throw new NotSupportedException ();
		}
		
		public override string StringEvaluate (IExpressionContext context)
		{
			throw new NotSupportedException ();
		}
		
		public override bool CanEvaluateToBool (IExpressionContext context)
		{
			return expression.CanEvaluateToBool (context);
		}
		
		public override bool CanEvaluateToNumber (IExpressionContext context)
		{
			return false;
		}
		
		public override bool CanEvaluateToString (IExpressionContext context)
		{
			return false;
		}
	}
}

