Attribute-flavored Domain Driven Design

using System;
using System.Collections.ObjectModel;
using Codebasement.DomainDrivenDesign.Basement.Attributes;
using Codebasement.DomainDrivenDesign.Basement.Basement;

namespace Codebasement.DomainDrivenDesign.Basement.Basement
{
    /// <summary>
    /// 
    /// </summary>
    public class RelatableObjectCollection : Collection<BasementObject>
    {
        private readonly Type _holderType;

        /// <summary>
        /// Initializes a new instance of the <see cref="RelatableObjectCollection"/> class.
        /// </summary>
        /// <param name="holderType">Type of the holder.</param>
        public RelatableObjectCollection(Type holderType)
        {
            _holderType = holderType;
        }

        /// <summary>
        /// Determines whether the specified type is defined.
        /// </summary>
        /// <param name="type">The type.</param>
        /// <returns>
        /// 	<c>true</c> if the specified type is defined; otherwise, <c>false</c>.
        /// </returns>
        public bool IsDefined(Type type)
        {
            if (_holderType.IsDefined(typeof (RelatableAttribute), true))
            {
                RelatableAttribute[] relatableAttributes =
                    _holderType.GetCustomAttributes(
                        typeof (RelatableAttribute), true)
                    as RelatableAttribute[];

                if (relatableAttributes != null)
                {
                    foreach (RelatableAttribute relationAttribute in relatableAttributes)
                    {
                        if (relationAttribute.BasementObjectType == type)
                        {
                            return true;
                        }
                    }
                }
            }
            return false;
        }
    }
}