//---------------------------------------------------------------------
// <copyright file="ComplexType.cs" company="Microsoft">
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// </copyright>
//
// @owner       Microsoft
// @backupOwner Microsoft
//---------------------------------------------------------------------
using System.Data.Common;
using System.Threading;
using System.Diagnostics;
 
namespace System.Data.Metadata.Edm
{
    /// <summary>
    /// Represent the Edm Complex Type
    /// </summary>
    public class ComplexType : StructuralType
    {
        #region Constructors
        /// <summary>
        /// Initializes a new instance of Complex Type with the given properties
        /// </summary>
        /// <param name="name">The name of the complex type</param>
        /// <param name="namespaceName">The namespace name of the type</param>
        /// <param name="version">The version of this type</param>
        /// <param name="dataSpace">dataSpace in which this ComplexType belongs to</param>
        /// <exception cref="System.ArgumentNullException">If either name, namespace or version arguments are null</exception>
        internal ComplexType(string name, string namespaceName, DataSpace dataSpace)
            : base(name, namespaceName, dataSpace)
        {
        }
 
        /// <summary>
        /// Initializes a new instance of Complex Type - required for bootstraping code
        /// </summary>
        internal ComplexType()
        {
            // No initialization of item attributes in here, it's used as a pass thru in the case for delay population
            // of item attributes
        }
 
 
        #endregion
 
        #region Fields
        private ReadOnlyMetadataCollection<EdmProperty> _properties;
        #endregion
 
        #region Properties
        /// <summary>
        /// Returns the kind of the type
        /// </summary>
        public override BuiltInTypeKind BuiltInTypeKind { get { return BuiltInTypeKind.ComplexType; } }
 
 
 
        /// <summary>
        /// Returns just the properties from the collection
        /// of members on this type
        /// </summary>
        public ReadOnlyMetadataCollection<EdmProperty> Properties
        {
            get
            {
                Debug.Assert(IsReadOnly, "this is a wrapper around this.Members, don't call it during metadata loading, only call it after the metadata is set to readonly");
                if (null == _properties)
                {
                    Interlocked.CompareExchange(ref _properties,
                        new FilteredReadOnlyMetadataCollection<EdmProperty, EdmMember>(
                            this.Members, Helper.IsEdmProperty), null);
                }
                return _properties;
            }
        }
        #endregion
 
        #region Methods
 
        /// <summary>
        /// Validates a EdmMember object to determine if it can be added to this type's 
        /// Members collection. If this method returns without throwing, it is assumed
        /// the member is valid. 
        /// </summary>
        /// <param name="member">The member to validate</param>
        /// <exception cref="System.ArgumentException">Thrown if the member is not a EdmProperty</exception>
        internal override void ValidateMemberForAdd(EdmMember member)
        {
            Debug.Assert(Helper.IsEdmProperty(member) || Helper.IsNavigationProperty(member),
                "Only members of type Property may be added to ComplexType.");
        }
        #endregion
    }
 
    internal sealed class ClrComplexType : ComplexType
    {
        /// <summary>cached CLR type handle, allowing the Type reference to be GC'd</summary>
        private readonly System.RuntimeTypeHandle _type;
 
        /// <summary>cached dynamic method to construct a CLR instance</summary>
        private Delegate _constructor;
 
        private readonly string _cspaceTypeName;
 
        /// <summary>
        /// Initializes a new instance of Complex Type with properties from the type.
        /// </summary>
        /// <param name="clrType">The CLR type to construct from</param>
        internal ClrComplexType(Type clrType, string cspaceNamespaceName, string cspaceTypeName)
            : base(EntityUtil.GenericCheckArgumentNull(clrType, "clrType").Name, clrType.Namespace ?? string.Empty, 
                   DataSpace.OSpace)
        {
            System.Diagnostics.Debug.Assert(!String.IsNullOrEmpty(cspaceNamespaceName) &&
                !String.IsNullOrEmpty(cspaceTypeName), "Mapping information must never be null");
 
            _type = clrType.TypeHandle;
            _cspaceTypeName = cspaceNamespaceName + "." + cspaceTypeName;
            this.Abstract = clrType.IsAbstract;
        }
        internal static ClrComplexType CreateReadonlyClrComplexType(Type clrType, string cspaceNamespaceName, string cspaceTypeName)
        {
            ClrComplexType type = new ClrComplexType(clrType, cspaceNamespaceName, cspaceTypeName);
            type.SetReadOnly();
            
            return type;
        }
 
        /// <summary>cached dynamic method to construct a CLR instance</summary>
        internal Delegate Constructor
        {
            get { return _constructor; }
            set
            {
                // It doesn't matter which delegate wins, but only one should be jitted
                Interlocked.CompareExchange(ref _constructor, value, null);
            }
        }
 
        /// <summary>
        /// </summary>
        internal override System.Type ClrType
        {
            get { return Type.GetTypeFromHandle(_type); }
        }
 
        internal string CSpaceTypeName { get { return _cspaceTypeName; } }
    }
}