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

using System; 
using System.Collections.Generic;
using System.Diagnostics;
using System.Xml;
using System.Data; 
using System.Data.Metadata.Edm;
 
 
namespace System.Data.EntityModel.SchemaObjectModel
{ 
    /// 
    /// Represents an End element in a relationship
    /// 
    internal sealed class RelationshipEnd : SchemaElement, IRelationshipEnd 
    {
        private string _unresolvedType; 
        private RelationshipMultiplicity? _multiplicity; 
        private SchemaEntityType _type;
        private List _operations; 

        /// 
        /// construct a Relationship End
        ///  
        /// 
        public RelationshipEnd(Relationship relationship) 
            : base(relationship) 
        {
        } 

        /// 
        /// Type of the End
        ///  
        public SchemaEntityType Type
        { 
            get 
            {
                return _type; 
            }
            private set
            {
                _type = value; 
            }
        } 
 
        /// 
        /// Multiplicity of the End 
        /// 
        public RelationshipMultiplicity? Multiplicity
        {
            get 
            {
                return _multiplicity; 
            } 
            set
            { 
                _multiplicity = value;
            }
        }
 
        /// 
        /// The On<Operation>s defined for the End 
        ///  
        public ICollection Operations
        { 
            get
            {
                if (_operations == null)
                    _operations = new List(); 
                return _operations;
            } 
        } 

        ///  
        /// do whole element resolution
        /// 
        internal override void ResolveTopLevelNames()
        { 
            base.ResolveTopLevelNames();
 
            if (Type == null && _unresolvedType != null) 
            {
                SchemaType element; 
                if (!Schema.ResolveTypeName(this, _unresolvedType, out element))
                {
                    return;
                } 

                Type = element as SchemaEntityType; 
                if (Type == null) 
                {
                    AddError(ErrorCode.InvalidRelationshipEndType, EdmSchemaErrorSeverity.Error, 
                        System.Data.Entity.Strings.InvalidRelationshipEndType(ParentElement.Name, element.FQName));
                }
            }
        } 

        internal override void Validate() 
        { 
            base.Validate();
 
            // Check if the end has multiplicity as many, it cannot have any operation behaviour
            if (Multiplicity == RelationshipMultiplicity.Many && Operations.Count != 0)
            {
                AddError(ErrorCode.EndWithManyMultiplicityCannotHaveOperationsSpecified, 
                         EdmSchemaErrorSeverity.Error,
                         System.Data.Entity.Strings.EndWithManyMultiplicityCannotHaveOperationsSpecified(this.Name, ParentElement.FQName)); 
            } 
        }
 
        /// 
        /// Do simple validation across attributes
        /// 
        protected override void HandleAttributesComplete() 
        {
            // set up the default name in before validating anythig that might want to display it in an error message; 
            if (Name == null && _unresolvedType != null) 
                Name = Utils.ExtractTypeName(Schema.DataModel, _unresolvedType);
 
            base.HandleAttributesComplete();
        }

        protected override bool ProhibitAttribute(string namespaceUri, string localName) 
        {
            if (base.ProhibitAttribute(namespaceUri, localName)) 
            { 
                return true;
            } 

            if (namespaceUri == null && localName == XmlConstants.Name)
            {
                return false; 
            }
            return false; 
        } 
        protected override bool HandleAttribute(XmlReader reader)
        { 
            if (base.HandleAttribute(reader))
            {
                return true;
            } 
            else if (CanHandleAttribute(reader, XmlConstants.Multiplicity))
            { 
                HandleMultiplicityAttribute(reader); 
                return true;
            } 
            else if (CanHandleAttribute(reader, XmlConstants.Role))
            {
                HandleNameAttribute(reader);
                return true; 
            }
            else if (CanHandleAttribute(reader, XmlConstants.TypeElement)) 
            { 
                HandleTypeAttribute(reader);
                return true; 
            }

            return false;
        } 

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

        /// 
        /// Handle the Type attribute
        ///  
        /// reader positioned at Type attribute
        private void HandleTypeAttribute(XmlReader reader) 
        { 
            Debug.Assert(reader != null);
 
            string type;
            if (!Utils.GetDottedName(this.Schema, reader, out type))
                return;
 
            _unresolvedType = type;
        } 
 
        /// 
        /// Handle the Multiplicity attribute 
        /// 
        /// reader positioned at Type attribute
        private void HandleMultiplicityAttribute(XmlReader reader)
        { 
            Debug.Assert(reader != null);
            RelationshipMultiplicity multiplicity; 
            if (!TryParseMultiplicity(reader.Value, out multiplicity)) 
            {
                AddError(ErrorCode.InvalidMultiplicity, EdmSchemaErrorSeverity.Error, reader, System.Data.Entity.Strings.InvalidRelationshipEndMultiplicity(ParentElement.Name, reader.Value)); 
            }
            _multiplicity = multiplicity;
        }
 
        /// 
        /// Handle an OnDelete element 
        ///  
        /// reader positioned at the element
        private void HandleOnDeleteElement(XmlReader reader) 
        {
            HandleOnOperationElement(reader, Operation.Delete);
        }
 
        /// 
        /// Handle an On<Operation> element 
        ///  
        /// reader positioned at the element
        /// the kind of operation being handled 
        private void HandleOnOperationElement(XmlReader reader, Operation operation)
        {
            Debug.Assert(reader != null);
 
            foreach (OnOperation other in Operations)
            { 
                if (other.Operation == operation) 
                    AddError(ErrorCode.InvalidOperation, EdmSchemaErrorSeverity.Error, reader, System.Data.Entity.Strings.DuplicationOperation(reader.Name));
            } 

            OnOperation onOperation = new OnOperation(this, operation);
            onOperation.Parse(reader);
            _operations.Add(onOperation); 
        }
 
 

        ///  
        /// The parent element as an IRelationship
        /// 
        internal new IRelationship ParentElement
        { 
            get
            { 
                return (IRelationship)(base.ParentElement); 
            }
        } 

        /// 
        /// Create a new Multiplicity object from a string
        ///  
        /// string containing Multiplicity definition
        /// new multiplicity object (null if there were errors) 
        /// try if the string was parsable, false otherwise 
        private static bool TryParseMultiplicity(string value, out RelationshipMultiplicity multiplicity)
        { 
            switch (value)
            {
                case "0..1":
                    multiplicity = RelationshipMultiplicity.ZeroOrOne; 
                    return true;
                case "1": 
                    multiplicity = RelationshipMultiplicity.One; 
                    return true;
                case "*": 
                    multiplicity = RelationshipMultiplicity.Many;
                    return true;
                default:
                    multiplicity = (RelationshipMultiplicity)(- 1); 
                    return false;
            } 
        } 
    }
} 

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

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