MatchKitProject/ObjectMapping/MatchableClassInfo.cs

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//=============================================================================
// System  : MatchKit
// File    : MatchableClassInfo.cs
// Author  : Fabio Bussu  (matchkit@fabiobussu.it)
// Updated : 04/16/2013
// Note    : Copyright 2013, Fabio Bussu, All rights reserved
//
// This code is published under the Microsoft Public License (Ms-PL). A copy
// of the license should be distributed with the code.  It can also be found
// at the project website: http://matchkit.codeplex.com. This notice, the
// author's name, and all copyright notices must remain intact in all
// applications, documentation, and source files.
//
// Version     Date     Who  Comments
// ============================================================================
// 1.0.0.0  04/16/2013   FB  First draft
//=============================================================================
using System;
using System.Collections.Generic;
using System.Reflection;

namespace MatchKit.ObjectMapping
{
	sealed class MatchableClassInfo
	{
		private static Dictionary<Type, MatchableClassInfo> _cache = new Dictionary<Type, MatchableClassInfo>();

		public static MatchableClassInfo Get(Type type)
		{
			if (type == null)
				throw new ArgumentNullException("type", "type cannot be null");
			MatchableClassInfo v;
			lock (_cache)
			{
				if (!_cache.TryGetValue(type, out v))
				{
					_cache[type] = v = InternalCreate(type);
				}
			}
			return v;
		}

		private static MatchableClassInfo InternalCreate(Type type)
		{
			var matchableClassAttribute = ReflectionUtils.GetAttribute<MatchableClassAttribute>(type);
			if (matchableClassAttribute == null)
				throw new MatchKitMappingException(2, "Type [{0}] must be marked with MatchableClassAttribute", type.FullName);
			if (!ReflectionUtils.IsAllocable(type))
				throw new MatchKitMappingException(3, "Type [{0}] must be an allocable type with a default constructor (even private)", type.FullName);
			var hasMappingEvents = typeof(IMatchMappingEvents).IsAssignableFrom(type);
			var members = new List<MatchableMemberInfo>();
			foreach (var member in EnumEligibleMembers(type))
				members.Add(new MatchableMemberInfo(new FieldOrProperty(member)));
			if (members.Count == 0)
				throw new MatchKitMappingException(4, "Type [{0}] is marked as MatchableClass but does not contains any matchable members", type.FullName);
			return new MatchableClassInfo(type, members.ToArray(), hasMappingEvents);
		}

		private static IEnumerable<MemberInfo> EnumEligibleMembers(Type type)
		{