//
// ProjectPropertyInstance.cs
//
// Author:
//   Rolf Bjarne Kvinge (rolf@xamarin.com)
//   Atsushi Enomoto (atsushi@xamarin.com)
//
// Copyright (C) 2011,2013 Xamarin Inc.
//
// 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;

namespace Microsoft.Build.Execution
{
	public class ProjectPropertyInstance
	{
		internal ProjectPropertyInstance (string name, bool isImmutable, string evaluatedValue, Func<string> evaluatedValueGetter = null)
		{
			Name = name;
			IsImmutable = isImmutable;
			evaluated_value_getter = evaluatedValueGetter ?? (() => evaluatedValue);
		}

		Func<string> evaluated_value_getter;
		public string EvaluatedValue {
			get { return evaluated_value_getter (); }
			set {
				if (IsImmutable)
					throw new InvalidOperationException ();
				evaluated_value_getter = () => value;
			}
		}

		public virtual bool IsImmutable { get; private set; }

		public string Name { get; private set; }
		
		public override string ToString ()
		{
			return string.Format ("{0}={1}", Name, EvaluatedValue);
		}
	}
}