#region CPL License
/*
Nuclex Framework
Copyright (C) 2002-2009 Nuclex Development Labs

This library is free software; you can redistribute it and/or
modify it under the terms of the IBM Common Public License as
published by the IBM Corporation; either version 1.0 of the
License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
IBM Common Public License for more details.

You should have received a copy of the IBM Common Public
License along with this library
*/
#endregion

using System;
using System.Collections.Generic;

namespace Nuclex.Ninject.Xna {

  /// <summary>Contains extension methods for the service provider</summary>
  public static class ServiceProviderExtensions {

    /// <summary>
    ///   Looks up the requested service, throwing an exception if it isn't found
    /// </summary>
    /// <typeparam name="ServiceType">Type of service that will be looked up</typeparam>
    /// <param name="serviceProvider">
    ///   The service provider that will be searched for the specified service
    /// </param>
    /// <returns>The request service</returns>
    /// <exception cref="NullReferenceException">
    ///   Thrown if the requested service does not exist
    /// </exception>
    public static ServiceType GetService<ServiceType>(
      this IServiceProvider serviceProvider
    ) {
      return (ServiceType)serviceProvider.GetService(typeof(ServiceType));
    }

    /// <summary>Tries to look up the specified service</summary>
    /// <typeparam name="ServiceType">Type of service that will be looked up</typeparam>
    /// <param name="serviceProvider">
    ///   The service provider that will be searched for the specified service
    /// </param>
    /// <param name="service">
    ///   Output parameter that will be receive the service if it was looked
    ///   up successfully
    /// </param>
    /// <returns>True if the requested service was found, false otherwise</returns>
    public static bool TryGetService<ServiceType>(
      this IServiceProvider serviceProvider, out ServiceType service
    ) {
      object serviceAsObject = serviceProvider.GetService(typeof(ServiceType));
      if (serviceAsObject == null) {
        service = default(ServiceType);
        return false;
      } else {
        service = (ServiceType)serviceAsObject;
        return true;
      }
    }

  }

} // namespace Nuclex.Ninject.Xna