EntityKeyElement.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 / EntityKeyElement.cs / 1305376 / EntityKeyElement.cs
                        
                        
                            //---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// 
// @owner       [....]
// @backupOwner [....] 
//--------------------------------------------------------------------- 

using System; 
using System.Collections;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Diagnostics; 
using System.Xml;
using System.Data; 
using System.Data.Metadata.Edm; 
using System.Data.Entity;
 
namespace System.Data.EntityModel.SchemaObjectModel
{
    /// 
    /// Represents an Key element in an EntityType element. 
    /// 
    internal sealed class EntityKeyElement : SchemaElement 
    { 
        private List _keyProperties;
 
        /// 
        /// Constructs an EntityContainerAssociationSetEnd
        /// 
        /// Reference to the schema element. 
        public EntityKeyElement( SchemaEntityType parentElement )
            : base( parentElement ) 
        { 
        }
 
        public IList KeyProperties
        {
            get
            { 
                if (_keyProperties == null)
                { 
                    _keyProperties = new List(); 
                }
                return _keyProperties; 
            }
        }

        protected override bool HandleAttribute(XmlReader reader) 
        {
            return false; 
        } 

        protected override bool HandleElement(XmlReader reader) 
        {
            if (base.HandleElement(reader))
            {
                return true; 
            }
            else if (CanHandleElement(reader, XmlConstants.PropertyRef)) 
            { 
                HandlePropertyRefElement(reader);
                return true; 
            }

            return false;
        } 

        ///  
        /// 
        /// 
        ///  
        private void HandlePropertyRefElement(XmlReader reader)
        {
            PropertyRefElement property = new PropertyRefElement((SchemaEntityType)ParentElement);
            property.Parse(reader); 
            this.KeyProperties.Add(property);
        } 
 
        /// 
        /// Used during the resolve phase to resolve the type name to the object that represents that type 
        /// 
        internal override void ResolveTopLevelNames()
        {
            Debug.Assert(_keyProperties != null, "xsd should have verified that there should be atleast one property ref element"); 
            foreach (PropertyRefElement property in _keyProperties)
            { 
                if (!property.ResolveNames((SchemaEntityType)this.ParentElement)) 
                {
                    AddError(ErrorCode.InvalidKey, EdmSchemaErrorSeverity.Error, System.Data.Entity.Strings.InvalidKeyNoProperty(this.ParentElement.FQName, property.Name)); 
                }
            }
        }
 
        /// 
        /// Validate all the key properties 
        ///  
        internal override void Validate()
        { 
            Debug.Assert(_keyProperties != null, "xsd should have verified that there should be atleast one property ref element");
            Dictionary propertyLookUp = new Dictionary(StringComparer.Ordinal);

            foreach (PropertyRefElement keyProperty in _keyProperties) 
            {
                StructuredProperty property = keyProperty.Property; 
                Debug.Assert(property != null, "This should never be null, since if we were not able to resolve, we should have never reached to this point"); 

                if (propertyLookUp.ContainsKey(property.Name)) 
                {
                    AddError(ErrorCode.DuplicatePropertySpecifiedInEntityKey, EdmSchemaErrorSeverity.Error,
                        System.Data.Entity.Strings.DuplicatePropertyNameSpecifiedInEntityKey(this.ParentElement.FQName, property.Name));
                    continue; 
                }
 
                propertyLookUp.Add(property.Name, keyProperty); 

                if (property.Nullable) 
                {
                    AddError(ErrorCode.InvalidKey, EdmSchemaErrorSeverity.Error,
                        System.Data.Entity.Strings.InvalidKeyNullablePart(property.Name, this.ParentElement.Name));
                } 

                    // currently we only support key properties of scalar type 
                if ((!(property.Type is ScalarType)) || 
                    (property.CollectionKind != CollectionKind.None))
                { 
                    AddError(ErrorCode.EntityKeyMustBeScalar,
                             EdmSchemaErrorSeverity.Error,
                             System.Data.Entity.Strings.EntityKeyMustBeScalar(property.Name, this.ParentElement.Name));
                    continue; 
                }
 
                Debug.Assert(property.TypeUsage != null, "For scalar type, typeusage must be initialized"); 
                // Bug 484200: Binary type key properties are currently not supported.
 
                PrimitiveTypeKind kind = ((PrimitiveType)property.TypeUsage.EdmType).PrimitiveTypeKind;
                if (kind == PrimitiveTypeKind.Binary)
                {
                    if (Schema.DataModel == SchemaDataModelOption.EntityDataModel) 
                    {
                        // Binary keys are only supported for V2.0 CSDL 
                        if (Schema.SchemaVersion < XmlConstants.EdmVersionForV2) 
                        {
                            AddError(ErrorCode.BinaryEntityKeyCurrentlyNotSupported, 
                                     EdmSchemaErrorSeverity.Error,
                                     Strings.EntityKeyTypeCurrentlyNotSupported(property.Name, this.ParentElement.FQName, kind));
                        }
                    } 
                    else
                    { 
                        Debug.Assert(SchemaDataModelOption.ProviderDataModel == Schema.DataModel, "Invalid DataModel encountered"); 
                        // Binary keys are only supported for V2.0 SSDL
                        if (Schema.SchemaVersion < XmlConstants.StoreVersionForV2) 
                        {
                            AddError(ErrorCode.BinaryEntityKeyCurrentlyNotSupported,
                                     EdmSchemaErrorSeverity.Error,
                                     Strings.EntityKeyTypeCurrentlyNotSupportedInSSDL(property.Name, this.ParentElement.FQName, 
                                        property.TypeUsage.EdmType.Name, property.TypeUsage.EdmType.BaseType.FullName, kind));
                        } 
                    } 
                }
 
            }
        }
    }
} 

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

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