Implementation.cs :  » Testing » MockObjects » DotNetMock » TestFramework » C# / CSharp Open Source

#region License
// Copyright (c) 2004 Choy Rim. All rights reserved.
#endregion
#region Imports
using System;
using System.Collections;
using DotNetMock.Core;

#endregion

namespace DotNetMock.TestFramework{
  /// <summary>
  /// Responsible for obtaining an implementation
  /// of <see cref="ITestFramework"/> for DotNetMock to use.
  /// </summary>
  public class Implementation
  {
    private static ITestFramework _instance = null;
    private static object _lock = new object();
    /// <summary>
    /// Global instance of <see cref="ITestFramework"/>
    /// implementation used by the rest of DotNetMock.
    /// </summary>
    public static ITestFramework Instance 
    {
      get 
      {
        // the synchronization here may be overkill
        // but just in case ...
        lock ( _lock ) 
        {
          if ( _instance==null ) 
          {
            IDictionary env =
              Environment.GetEnvironmentVariables();
            IDynamicLinker linker = new SystemDynamicLinker();
            ImplementationFactory factory =
              new ImplementationFactory(env, linker);
            _instance = factory.NewImplementation();
          }
          return _instance;
        }
      }
    }
  }
}