#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.Runtime.Serialization;
using System.Security.Permissions;

#endregion

namespace Spring.Aop.Framework.DynamicProxy
{
	/// <summary>
	/// Base class that each dynamic composition proxy has to extend.
	/// </summary>
	/// <author>Aleksandar Seovic</author>
    /// <author>Bruno Baia</author>
    [Serializable]
    public abstract class BaseCompositionAopProxy : AdvisedProxy, IAopProxy, ISerializable
    {
        #region Constructor (s) / Destructor

        /// <summary>
        /// Default constructor.
        /// </summary>
        public BaseCompositionAopProxy()
        {}

        /// <summary>
        /// Creates a new instance of the
        /// <see cref="Spring.Aop.Framework.DynamicProxy.BaseCompositionAopProxy"/> class.
        /// </summary>
        /// <param name="advised">The proxy configuration.</param>
        public BaseCompositionAopProxy(IAdvised advised) : base(advised)
		{
            base.Initialize(advised, this);
        }

        /// <summary>
        /// Deserialization constructor.
        /// </summary>
        /// <param name="info">Serialization data.</param>
        /// <param name="context">Serialization context.</param>
        protected BaseCompositionAopProxy(SerializationInfo info, StreamingContext context) : base(info, context)
        {}

	    ///<summary>
	    ///Populates a <see cref="T:System.Runtime.Serialization.SerializationInfo"></see> with the data needed to serialize the target object.
	    ///</summary>
	    void ISerializable.GetObjectData(SerializationInfo info, StreamingContext context)
        {
            base.GetObjectData(info, context);
        }

        #endregion

		#region IAopProxy Members

		/// <summary>
		/// Returns this proxy instance
		/// </summary>
		/// <returns></returns>
		object IAopProxy.GetProxy()
		{
			return this;
		}

		#endregion

        #region Equal, HashCode and ToString overrides

        /// <summary>
        /// Delegate to target object handling of equals method.
        /// </summary>
        /// <param name="obj">The object to compare with the current target object</param>
        /// <returns>true if the specified Object is equal to the current target object; otherwise, false</returns>
        public override bool Equals(object obj)
        {
//            if (ReferenceEquals(this, obj))
//            {
//                return true;
//            }

            AdvisedProxy otherProxy = obj as AdvisedProxy;
            if (otherProxy != null)
            {
                using (m_targetSourceWrapper)
                using (otherProxy.m_targetSourceWrapper)
                {
                    object target = m_targetSourceWrapper.GetTarget();
                    object otherTarget = otherProxy.m_targetSourceWrapper.GetTarget();
                    if (target == null)
                    {
                        return (otherTarget == null);
                    }
                    return target.Equals(otherTarget);
                }
            }

            using (m_targetSourceWrapper)
            {
                object target = m_targetSourceWrapper.GetTarget();
                if (target == null)
                {
                    return (obj == null);
                }
                return target.Equals(obj);
            }
        }

        /// <summary>
        /// Delgate to the target object generation of the hash code.
        /// </summary>
        /// <returns>A hash code for the target object.</returns>
        public override int GetHashCode()
        {
            using (m_targetSourceWrapper)
            {
                object target = m_targetSourceWrapper.GetTarget();
                if (target != null)
                {
                    return target.GetHashCode();
                }
                return 0;
            }
        }

        /// <summary>
        /// Returns a String the represents the target object.
        /// </summary>
        /// <returns>A String that represents the target object</returns>
        public override string ToString()
        {
            using (m_targetSourceWrapper)
            {
                object target = m_targetSourceWrapper.GetTarget();
                if (target != null)
                {
                    return target.ToString();
                }
                return base.ToString();
            }
        }

        #endregion
    }
}