NotPredicate.cs :  » Testing » MockObjects » DotNetMock » Dynamic » Predicates » C# / CSharp Open Source

#region License
// Copyright (c) 2004 Griffin Caprio & Choy Rim. All rights reserved.
#endregion
#region Imports
using System;
#endregion

namespace DotNetMock.Dynamic.Predicates{
  /// <summary>
  /// <see cref="IPredicate"/> that is used to wrap other <see cref="IPredicate"/> objects, and invert their results.
  /// </summary>
  public class NotPredicate : AbstractPredicate 
  {
    private IPredicate _wrappedPredicate;
    /// <summary>
    /// Default Constructor
    /// </summary>
    /// <param name="wrappedPredicate">original <see cref="IPredicate"/> to wrap.</param>
    public NotPredicate(IPredicate wrappedPredicate)
    {
      _wrappedPredicate = wrappedPredicate;
    }
    /// <summary>
    /// Evaluates the input value against the original value.
    /// </summary>
    /// <param name="inputValue">input value</param>
    /// <returns>The opposite ( ! ) of the original <see cref="IPredicate"/>s evaluation.</returns>  
    public override bool Eval(object inputValue) 
    {
      return !_wrappedPredicate.Eval(inputValue);
    }
    /// <summary>
    /// Text representation of what is evaluated by the
    /// <see cref="Eval"/> method.
    /// </summary>
    public override string ExpressionAsText(string name)
    {
      return String.Format(
        "not ({0})",
        _wrappedPredicate.ExpressionAsText(name)
        );
    }
  }
}