//---------------------------------------------------------------------
// <copyright file="TypeRefElement.cs" company="Microsoft">
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// </copyright>
//
// @owner       Microsoft
// @backupOwner Microsoft
//---------------------------------------------------------------------
 
namespace System.Data.EntityModel.SchemaObjectModel
{
    using System;
    using System.Collections.Generic;
    using System.Data.Entity;
    using System.Data.Metadata.Edm;
    using System.Diagnostics;
    using System.Text;
    using System.Xml;
    using Som = System.Data.EntityModel.SchemaObjectModel;
 
    class TypeRefElement : ModelFunctionTypeElement
    {
        #region constructor
        /// <summary>
        /// 
        /// </summary>
        /// <param name="parentElement"></param>
        internal TypeRefElement(SchemaElement parentElement)
            : base(parentElement)
        {
 
        }
        #endregion
 
        protected override bool HandleAttribute(XmlReader reader)
        {
            if (base.HandleAttribute(reader))
            {
                return true;
            }
            else if (CanHandleAttribute(reader, XmlConstants.TypeElement))
            {
                HandleTypeAttribute(reader);
                return true;
            }
 
            return false;
        }
 
        protected void HandleTypeAttribute(XmlReader reader)
        {
            Debug.Assert(reader != null);
 
            string type;
            if (!Utils.GetString(Schema, reader, out type))
                return;
 
            if (!Utils.ValidateDottedName(Schema, reader, type))
                return;
 
            _unresolvedType = type;
        }
 
        internal override bool ResolveNameAndSetTypeUsage(Converter.ConversionCache convertedItemCache, Dictionary<Som.SchemaElement, GlobalItem> newGlobalItems)
        {
            if (_type is ScalarType) //Create and store type usage for scalar type
            {
                _typeUsageBuilder.ValidateAndSetTypeUsage(_type as ScalarType, false);
                _typeUsage = _typeUsageBuilder.TypeUsage;
                return true;
            }
            else  //Try to resolve edm type. If not now, it will resolve in the second pass
            {
                EdmType edmType = (EdmType)Converter.LoadSchemaElement(_type, _type.Schema.ProviderManifest, convertedItemCache, newGlobalItems);
                if (edmType != null)
                {
                    _typeUsageBuilder.ValidateAndSetTypeUsage(edmType, false); //use typeusagebuilder so dont lose facet information
                    _typeUsage = _typeUsageBuilder.TypeUsage;
                }
 
                return _typeUsage != null;
            }
        }
 
        internal override void WriteIdentity(StringBuilder builder)
        {
            Debug.Assert(UnresolvedType != null && !UnresolvedType.Trim().Equals(String.Empty));
            builder.Append(UnresolvedType);
        }
 
        internal override TypeUsage GetTypeUsage()
        {
            Debug.Assert(_typeUsage != null);
            return _typeUsage;
        }
 
        internal override void Validate()
        {
            base.Validate();
 
            ValidationHelper.ValidateFacets(this, _type, _typeUsageBuilder);
        }
    }
}