File: AttributedMetaType.cs

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#region MIT license
// 
// MIT license
//
// Copyright (c) 2007-2008 Jiri Moudry, Stefan Klinger
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
// 
#endregion

using System;
using System.Collections.ObjectModel;
using System.Data.Linq.Mapping;
using System.Diagnostics;
using System.Linq;
using System.Reflection;
using DbLinq.Util;
using System.Collections.Generic;

namespace DbLinq.Data.Linq.Mapping
{
    [DebuggerDisplay("MetaType for {Name}")]
    internal class AttributedMetaType : MetaType
    {
        internal AttributedMetaType(Type classType)
        {
            type = classType;

			AssociationsLookup = new Dictionary<MemberInfo, MetaDataMember>();
			_AssociationFixupList = new List<AssociationData>();

			//First add the member to the AssociationsLookup table, because creation of the Association will cause both meta classes to look each other up, or possibly a self lookup
			//We'll also cache the association data in _AssociationFixupList to be used by GetAssociations
			foreach (var memberInfo in type.GetMembers())
			{
				var association = memberInfo.GetAttribute<AssociationAttribute>();
				if (association == null)
					continue;
				var dataMember = new AttributedAssociationMetaDataMember(memberInfo, association, this);
				AssociationsLookup[memberInfo] = dataMember;
				_AssociationFixupList.Add(new AssociationData() { Association = association, Member = memberInfo, DataMember = dataMember });
			}
        }

        internal void SetMetaTable(MetaTable metaTable)
        {
            table = metaTable;
        }

        private ReadOnlyCollection<MetaAssociation> _associations;
        public override ReadOnlyCollection<MetaAssociation> Associations
        {
            get {
                if (_associations == null)
                {
                    _associations = GetAssociations().ToList().AsReadOnly();
                }
                return _associations;
            }
        }

		private class AssociationData
		{
			public AssociationAttribute Association;
			public MemberInfo Member;
			public AttributedAssociationMetaDataMember DataMember;
		}

        private IEnumerable<MetaAssociation> GetAssociations()
        {
			//We can clear our fixup list as we're now going to convert it to the association list
			var associationFixupList = _AssociationFixupList;
			_AssociationFixupList = null;

			foreach (AssociationData data in associationFixupList)
			{
				var metaAssociation = new AttributedMetaAssociation(data.Member, data.Association, data.DataMember);
				data.DataMember.SetAssociation(metaAssociation);
                yield return metaAssociation;
			}
        }

        public override bool CanInstantiate
        {
            // TODO: shall we expect something else?
            get { return true; }
        }

        private ReadOnlyCollection<MetaDataMember> dataMembers;
        public override ReadOnlyCollection<MetaDataMember> DataMembers
        {
            get {
                if (dataMembers == null)
                {
                    dataMembers =
                        (from m in type.GetMembers()
                         let c = m.GetAttribute<ColumnAttribute>()
                         where c != null
                         select (MetaDataMember) new AttributedColumnMetaDataMember(m, c, this))
                        .ToList().AsReadOnly();
                }
                return dataMembers;
            }
        }

        public override MetaDataMember DBGeneratedIdentityMember
        {
            get { throw new NotImplementedException(); }
        }

        public override ReadOnlyCollection<MetaType> DerivedTypes
        {
            get { throw new NotImplementedException(); }
        }

        public override MetaDataMember Discriminator
        {
            get { throw new NotImplementedException(); }
        }

        public override MetaDataMember GetDataMember(MemberInfo member)
        {
            // TODO: optimize?
            // A tip to know the MemberInfo for the same member is not the same when declared from a class and its inheritor
            return (from m in PersistentDataMembers where m.Member.Name == member.Name select m).SingleOrDefault();
        }

        public override MetaType GetInheritanceType(Type baseType)
        {
            throw new NotImplementedException();
        }

        public override MetaType GetTypeForInheritanceCode(object code)
        {
            throw new NotImplementedException();
        }

        public override bool HasAnyLoadMethod
        {
            get { throw new NotImplementedException(); }
        }

        public override bool HasAnyValidateMethod
        {
            get { throw new NotImplementedException(); }
        }

        public override bool HasInheritance
        {
            get { throw new NotImplementedException(); }
        }

        public override bool HasInheritanceCode
        {
            get { throw new NotImplementedException(); }
        }

        public override bool HasUpdateCheck
        {
            get { throw new NotImplementedException(); }
        }

        private ReadOnlyCollection<MetaDataMember> identityMembers;
        public override ReadOnlyCollection<MetaDataMember> IdentityMembers
        {
            get {
                if (identityMembers == null)
                    identityMembers =
                        DataMembers.Where(m => m.IsPrimaryKey).ToList().AsReadOnly();
                return identityMembers; 
            }
        }

        public override MetaType InheritanceBase
        {
            get { throw new NotImplementedException(); }
        }

        public override object InheritanceCode
        {
            get { throw new NotImplementedException(); }
        }

        public override MetaType InheritanceDefault
        {
            get { throw new NotImplementedException(); }
        }

        public override MetaType InheritanceRoot
        {
            get { throw new NotImplementedException(); }
        }

        public override ReadOnlyCollection<MetaType> InheritanceTypes
        {
            get { throw new NotImplementedException(); }
        }

        public override bool IsEntity
        {
            get { return true; }
        }

        public override bool IsInheritanceDefault
        {
            get { throw new NotImplementedException(); }
        }

        public override MetaModel Model
        {
            get { return Table.Model; }
        }

        public override string Name
        {
            get { return type.Name; }
        }

        public override MethodInfo OnLoadedMethod
        {
            get { throw new NotImplementedException(); }
        }

        public override MethodInfo OnValidateMethod
        {
            get { throw new NotImplementedException(); }
        }

    	private ReadOnlyCollection<MetaDataMember> _persistentDataMembers;
        public override ReadOnlyCollection<MetaDataMember> PersistentDataMembers
        {
            get {
                if (_persistentDataMembers == null)
                    _persistentDataMembers =
                        DataMembers.Where(m => m.IsPersistent).ToList().AsReadOnly();
                return _persistentDataMembers;
            }
        }

        private MetaTable table;
        public override MetaTable Table
        {
            get { return table; }
        }

        private readonly Type type;
        public override Type Type
        {
            get { return type; }
        }

        public override MetaDataMember VersionMember
        {
            get { throw new NotImplementedException(); }
        }

		internal Dictionary<MemberInfo, MetaDataMember> AssociationsLookup;
		private List<AssociationData> _AssociationFixupList;
    }
}