File: EmptyConstraint.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;
using System.Collections;

namespace NUnit.Framework.Constraints
{
	/// <summary>
	/// EmptyConstraint tests a whether a string or collection is empty,
	/// postponing the decision about which test is applied until the
	/// type of the actual argument is known.
	/// </summary>
	public class EmptyConstraint : Constraint
	{
		private Constraint RealConstraint
		{
			get 
			{
				if ( actual is string )
					return new EmptyStringConstraint();
				else
					return new EmptyCollectionConstraint();
			}
		}
		
		/// <summary>
        /// Test whether the constraint is satisfied by a given value
        /// </summary>
        /// <param name="actual">The value to be tested</param>
        /// <returns>True for success, false for failure</returns>
		public override bool Matches(object actual)
		{
			this.actual = actual;

			return this.RealConstraint.Matches( actual );
		}

        /// <summary>
        /// Write the constraint description to a MessageWriter
        /// </summary>
        /// <param name="writer">The writer on which the description is displayed</param>
		public override void WriteDescriptionTo(MessageWriter writer)
		{
			this.RealConstraint.WriteDescriptionTo( writer );
		}
	}
}