ItemType.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / EntityModel / SchemaObjectModel / ItemType.cs / 1305376 / ItemType.cs
                        
                        
                            //---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// 
// @owner       [....]
// @backupOwner [....] 
//--------------------------------------------------------------------- 

using System; 
using System.Collections;
using System.Collections.Generic;
using System.Xml;
using System.Data; 
using System.Diagnostics;
using metadata = System.Data.Metadata.Edm; 
using System.Data.Metadata.Edm; 

namespace System.Data.EntityModel.SchemaObjectModel 
{
    /// 
    /// Summary description for Item.
    ///  
    [System.Diagnostics.DebuggerDisplay("Name={Name}, BaseType={BaseType.FQName}, HasKeys={HasKeys}")]
    internal sealed class SchemaEntityType : StructuredType 
    { 
        #region Private Fields
 
        private const char KEY_DELIMITER = ' ';
        private ISchemaElementLookUpTable _navigationProperties = null;
        private EntityKeyElement _keyElement = null;
        private static List EmptyKeyProperties = new List(0); 
        #endregion
        #region Public Methods 
 
        /// 
        /// 
        /// 
        /// 
        public SchemaEntityType(Schema parentElement)
            : base(parentElement) 
        {
            if (Schema.DataModel == SchemaDataModelOption.EntityDataModel) 
                OtherContent.Add(Schema.SchemaSource); 
        }
 
        #endregion
        #region Protected Methods

        ///  
        ///
        ///  
        internal override void ResolveTopLevelNames() 
        {
            base.ResolveTopLevelNames(); 

            if (BaseType != null)
            {
                if (!(BaseType is SchemaEntityType)) 
                {
                    AddError(ErrorCode.InvalidBaseType, EdmSchemaErrorSeverity.Error, 
                        System.Data.Entity.Strings.InvalidBaseTypeForItemType(BaseType.FQName, FQName)); 
                }
                // Since the base type is not null, key must be defined on the base type 
                else if (_keyElement != null && BaseType != null)
                {
                    AddError(ErrorCode.InvalidKey, EdmSchemaErrorSeverity.Error,
                        System.Data.Entity.Strings.InvalidKeyKeyDefinedInBaseClass(FQName, BaseType.FQName)); 
                }
            } 
            // If the base type is not null, then the key must be defined on the base entity type, since 
            // we don't allow entity type without keys.
            else if (_keyElement == null) 
            {
                AddError(ErrorCode.KeyMissingOnEntityType, EdmSchemaErrorSeverity.Error,
                    System.Data.Entity.Strings.KeyMissingOnEntityType(this.FQName));
            } 
            else if (null == BaseType && null != UnresolvedBaseType)
            { 
                // this is already an error situation, we won't do any resolve name further in this type 
                return;
            } 
            else
            {
                _keyElement.ResolveTopLevelNames();
            } 
        }
 
        #endregion 
        #region Protected Properties
 
        protected override bool HandleAttribute(XmlReader reader)
        {
            if (base.HandleAttribute(reader))
            { 
                return true;
            } 
 
            return false;
        } 

        #endregion
        #region Private Methods
 
        #endregion
        #region Public Properties 
 
        public EntityKeyElement KeyElement
        { 
            get
            {
                return _keyElement;
            } 
        }
 
        ///  
        ///
        ///  
        public IList DeclaredKeyProperties
        {
            get
            { 
                if (KeyElement == null)
                { 
                    return EmptyKeyProperties; 
                }
                return KeyElement.KeyProperties; 
            }
        }

        ///  
        ///
        ///  
        ///  
        public IList KeyProperties
        { 
            get
            {
                if (KeyElement == null)
                { 
                    if (BaseType != null)
                    { 
                        System.Diagnostics.Debug.Assert(BaseType is SchemaEntityType, "ItemType.BaseType is not ItemType"); 
                        return (BaseType as SchemaEntityType).KeyProperties;
                    } 

                    return EmptyKeyProperties;
                }
                return this.KeyElement.KeyProperties; 
            }
        } 
 
        /// 
        /// 
        /// 
        public ISchemaElementLookUpTable NavigationProperties
        {
            get 
            {
                if (_navigationProperties == null) 
                { 
                    _navigationProperties = new FilteredSchemaElementLookUpTable(NamedMembers);
                } 
                return _navigationProperties;
            }
        }
 
        #endregion
        #region Protected Methods 
 
        /// 
        /// 
        /// 
        internal override void Validate()
        {
            // structured type base class will validate all members (properties, nav props, etc) 
            base.Validate();
 
            if (this.KeyElement != null) 
            {
                this.KeyElement.Validate(); 
            }
        }

        #endregion 
        #region Protected Properties
 
        protected override bool HandleElement(XmlReader reader) 
        {
            if (base.HandleElement(reader)) 
            {
                return true;
            }
            else if (CanHandleElement(reader, XmlConstants.Key)) 
            {
                HandleKeyElement(reader); 
                return true; 
            }
            else if (CanHandleElement(reader, XmlConstants.NavigationProperty)) 
            {
                HandleNavigationPropertyElement(reader);
                return true;
            } 
            return false;
        } 
 
        #endregion
        #region Private Methods 

        /// 
        ///
        ///  
        /// 
        private void HandleNavigationPropertyElement(XmlReader reader) 
        { 
            NavigationProperty navigationProperty = new NavigationProperty(this);
            navigationProperty.Parse(reader); 
            AddMember(navigationProperty);
        }

        ///  
        ///
        ///  
        ///  
        private void HandleKeyElement(XmlReader reader)
        { 
            _keyElement = new EntityKeyElement(this);
            _keyElement.Parse(reader);
        }
        #endregion 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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ItemType.cs source code in C# .NET

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