#region License

/*
 * Copyright © 2002-2005 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#endregion

#region Imports

using System;
using System.Reflection;
using Spring.Objects.Factory.Config;

#endregion

namespace Spring.Objects.Factory.Support
{
	/// <summary>
	/// An <see cref="Spring.Objects.Factory.Support.IMethodReplacer"/>
	/// implementation that delegates to an
	/// <see cref="Spring.Objects.Factory.Support.IMethodReplacer"/> that is
	/// obtained as the result of a lookup in an associated IoC container.
	/// </summary>
	/// <remarks>
	/// <p>
	/// This class is reserved for internal use within the framework; it is
	/// not intended to be used by application developers using Spring.NET.
	/// </p>
	/// </remarks>
	/// <author>Rick Evans</author>
	public sealed class DelegatingMethodReplacer : AbstractMethodReplacer
	{
		/// <summary>
		/// Creates a new instance of the
		/// <see cref="ArgumentNullException"/>
		/// class.
		/// </summary>
		/// <param name="objectDefinition">
		/// The object definition that is the target of the method replacement.
		/// </param>
		/// <param name="objectFactory">
		/// The enclosing IoC container with which the above
		/// <paramref name="objectDefinition"/> is associated.
		/// </param>
		/// <exception cref="DelegatingMethodReplacer">
		/// If either of the supplied arguments is <see langword="null"/>.
		/// </exception>
		public DelegatingMethodReplacer(IConfigurableObjectDefinition objectDefinition, IObjectFactory objectFactory)
			: base(objectDefinition, objectFactory)
		{
		}

		/// <summary>
		/// Reimplements the supplied <paramref name="method"/> by delegating to
		/// another <see cref="Spring.Objects.Factory.Support.IMethodReplacer"/>
		/// looked up in an enclosing IoC container.
		/// </summary>
		/// <param name="target">
		/// The instance whose <paramref name="method"/> is to be
		/// (re)implemented.
		/// </param>
		/// <param name="method">
		/// The method that is to be (re)implemented.
		/// </param>
		/// <param name="arguments">The target method's arguments.</param>
		/// <returns>
		/// The result of the delegated call to the looked up
		/// <see cref="Spring.Objects.Factory.Support.IMethodReplacer"/>.
		/// </returns>
		public override object Implement(object target, MethodInfo method, object[] arguments)
		{
			ReplacedMethodOverride ovr = (ReplacedMethodOverride) GetOverride(method);
			IMethodReplacer methodReplacement = (IMethodReplacer) GetObject(ovr.MethodReplacerObjectName);
			return methodReplacement.Implement(target, method, arguments);
		}
	}
}
