ObjectLounge - An Object-Oriented Database Framework

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Reflection;

namespace Technewlogic.ObjectLounge.Framework.MetaModel
{
	// TODO: Tests für das automatische Injecten von Entity Collections schreiben
	public class ApplicationContextSpec
	{
		internal ApplicationContextSpec(
			ModelConfigurationErrorManager errorManager,
			Type contextType)
		{
			_errorManager = errorManager;
			ContextType = contextType;

			BuildApplicationContextCollectionSpecs();
		}

		private readonly ModelConfigurationErrorManager _errorManager;

		public Type ContextType { get; private set; }
		public IEnumerable<ApplicationContextCollectionSpec> ApplicationContextCollectionSpecs { get; private set; }

		public IEnumerable<Type> RegisteredTypes
		{
			get
			{
				return ApplicationContextCollectionSpecs
					.Select(it => it.EntityType);
			}
		}

		private void BuildApplicationContextCollectionSpecs()
		{
			var contextCollectionProperties = GetContextCollectionProperties();

			ApplicationContextCollectionSpecs = contextCollectionProperties
				.Select(it => new ApplicationContextCollectionSpec(_errorManager, it))
				.ToArray();

			var redundantModelTypes = ApplicationContextCollectionSpecs
				.GroupBy(it => it.EntityType)
				.Where(it => it.Count() > 1);
			foreach (var it in redundantModelTypes)
				_errorManager.ModelTypeRegisteredRedundant(it.Key);
		}

		#region Helper

		private IEnumerable<PropertyInfo> GetContextCollectionProperties()
		{
			var contextCollectionProperties = ContextType
				.GetProperties(BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance)
				.Select(it => new
				{
					PropertyInfo = it,
					EntityCollectionAttribute = it
						.GetCustomAttributes(typeof(EntityCollectionAttribute), true)
						.FirstOrDefault()
				})
				.Where(it => it.EntityCollectionAttribute != null)
				.Select(it => it.PropertyInfo);

			return contextCollectionProperties;
		}

		#endregion
	}
}