// ****************************************************************

// 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

// ****************************************************************

using System;



namespace NUnit.Core.Extensibility

{

    /// <summary>

    /// Represents a single point of extension for NUnit. Some extension

    /// points may accept only a single extension, while others may

    /// accept more than one at the same time.

    /// </summary>

    public interface IExtensionPoint

	{

		/// <summary>

		/// Get the name of this extension point

		/// </summary>

		string Name { get; }



        /// <summary>

        /// Get the host that provides this extension point

        /// </summary>

        IExtensionHost Host { get; }



        /// <summary>

        /// Install an extension at this extension point. If the

        /// extension object does not meet the requirements for

        /// this extension point, an exception is thrown.

        /// </summary>

        /// <param name="extension">The extension to install</param>

        void Install(object extension);



        /// <summary>

		/// Removes an extension from this extension point. If the

		/// extension object is not present, the method returns

		/// without error.

        /// </summary>

        /// <param name="extension"></param>

		void Remove( object extension );

	}



    /// <summary>

    /// Represents a single point of extension for NUnit. Some extension

    /// points may accept only a single extension, while others may

    /// accept more than one at the same time. This interface enhances

    /// IExtensionPoint by allowing specification of a priority

    /// order for applying addins.

    /// </summary>

    public interface IExtensionPoint2 : IExtensionPoint

    {

        /// <summary>

        /// Install an extension at this extension point specifying

        /// an integer priority value for the extension.If the

        /// extension object does not meet the requirements for

        /// this extension point, or if the extension point does

        /// not support the requested priority level, an exception 

        /// is thrown.

        /// </summary>

        /// <param name="extension">The extension to install</param>

        /// <param name="priority">The priority level for this extension</param>

        void Install(object extension, int priority);

    }

}