EntityContainerAssociationSetEnd.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 / EntityContainerAssociationSetEnd.cs / 1305376 / EntityContainerAssociationSetEnd.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; 

namespace System.Data.EntityModel.SchemaObjectModel 
{
    /// 
    /// Represents an  element.
    ///  
    internal sealed class EntityContainerAssociationSetEnd : EntityContainerRelationshipSetEnd
    { 
        private string _unresolvedRelationshipEndRole; 

        ///  
        /// Constructs an EntityContainerAssociationSetEnd
        /// 
        /// Reference to the schema element.
        public EntityContainerAssociationSetEnd( EntityContainerAssociationSet parentElement ) 
            : base( parentElement )
        { 
        } 

        public string Role 
        {
            get
            {
                return _unresolvedRelationshipEndRole; 
            }
            set 
            { 
                _unresolvedRelationshipEndRole = value;
            } 
        }

        public override string Name
        { 
            get
            { 
                return Role; 
            }
        } 

        protected override bool HandleAttribute(XmlReader reader)
        {
            if (base.HandleAttribute(reader)) 
            {
                return true; 
            } 
            else if (CanHandleAttribute(reader, XmlConstants.Role))
            { 
                HandleRoleAttribute(reader);
                return true;
            }
 
            return false;
        } 
 
        /// 
        /// This is the method that is called when an Role Attribute is encountered. 
        /// 
        /// The XmlRead positned at the extent attribute.
        private void HandleRoleAttribute( XmlReader reader )
        { 
            _unresolvedRelationshipEndRole = HandleUndottedNameAttribute( reader, _unresolvedRelationshipEndRole );
        } 
 
        /// 
        /// Used during the resolve phase to resolve the type name to the object that represents that type 
        /// 
        internal override void  ResolveTopLevelNames()
        {
            base.ResolveTopLevelNames(); 

            // resolve end name to the corosponding relationship end 
            IRelationship relationship = ParentElement.Relationship; 
            if ( relationship == null )
            { 
                // error already logged for this
                return;
            }
 
        }
 
        internal override void ResolveSecondLevelNames() 
        {
            base.ResolveSecondLevelNames(); 

            if (_unresolvedRelationshipEndRole == null && EntitySet != null)
            {
                // no role provided, infer it 
                RelationshipEnd = InferRelationshipEnd(EntitySet);
                if (RelationshipEnd != null) 
                { 
                    _unresolvedRelationshipEndRole = RelationshipEnd.Name;
                } 
            }
            else if (_unresolvedRelationshipEndRole != null)
            {
                IRelationship relationship = ParentElement.Relationship; 
                IRelationshipEnd end;
                if (relationship.TryGetEnd(_unresolvedRelationshipEndRole, out end)) 
                { 
                    RelationshipEnd = end;
                } 
                else
                {
                    // couldn't find a matching relationship end for this RelationshipSet end
                    AddError(ErrorCode.InvalidContainerTypeForEnd, EdmSchemaErrorSeverity.Error, 
                        System.Data.Entity.Strings.InvalidEntityEndName(Role, relationship.FQName));
 
                } 
            }
        } 

        /// 
        /// If the role name is missing but an entity set is given, figure out what the
        /// relationship end should be 
        /// 
        /// The given EntitySet 
        /// The appropriate relationship end 
        private IRelationshipEnd InferRelationshipEnd( EntityContainerEntitySet set )
        { 
            Debug.Assert(set != null, "set parameter is null");

            if ( ParentElement.Relationship == null )
            { 
                return null;
            } 
 
            List possibleEnds = new List();
            foreach ( IRelationshipEnd end in ParentElement.Relationship.Ends ) 
            {
                if ( set.EntityType.IsOfType( end.Type ) )
                {
                    possibleEnds.Add( end ); 
                }
            } 
 
            if ( possibleEnds.Count == 1 )
            { 
                return possibleEnds[0];
            }
            else if ( possibleEnds.Count == 0 )
            { 
                // no matchs
                AddError( ErrorCode.FailedInference, EdmSchemaErrorSeverity.Error, 
                    System.Data.Entity.Strings.InferRelationshipEndFailedNoEntitySetMatch( 
                    set.FQName, this.ParentElement.FQName, ParentElement.Relationship.FQName, set.EntityType.FQName, this.ParentElement.ParentElement.FQName ) );
            } 
            else
            {
                // ambiguous
                AddError( ErrorCode.FailedInference, EdmSchemaErrorSeverity.Error, 
                    System.Data.Entity.Strings.InferRelationshipEndAmbiguous(
                    set.FQName, this.ParentElement.FQName, ParentElement.Relationship.FQName, set.EntityType.FQName, this.ParentElement.ParentElement.FQName)); 
 
            }
 
            return null;
        }

        internal override SchemaElement Clone(SchemaElement parentElement) 
        {
            EntityContainerAssociationSetEnd setEnd = new EntityContainerAssociationSetEnd((EntityContainerAssociationSet)parentElement); 
            setEnd._unresolvedRelationshipEndRole = _unresolvedRelationshipEndRole; 
            setEnd.EntitySet = this.EntitySet;
 
            return setEnd;
        }

    } 
}

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

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