mono/mcs/class/System.Core/System.Linq.jvm/ExpressionValidator.cs

//
// ExpressionValidator.cs
//
// (C) 2008 Mainsoft, Inc. (http://www.mainsoft.com)
// (C) 2008 db4objects, Inc. (http://www.db4o.com)
//
// 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.Linq.Expressions;

namespace System.Linq.jvm {

	class ExpressionValidator : ExpressionVisitor
	{
		LambdaExpression lambda;

		public ExpressionValidator (LambdaExpression lambda)
		{
			this.lambda = lambda;
		}

		protected override void VisitParameter (ParameterExpression parameter)
		{
			foreach (var param in lambda.Parameters) {
				if (param.Name == parameter.Name && param != parameter)
					throw new InvalidOperationException ("Lambda Parameter not in scope");
			}
		}

		public void Validate()
		{
			Visit (lambda);
		}
    }
}