NavigationProperty.cs source code in C# .NET

                        Code:
                         / Dotnetfx_Vista_SP2 / Dotnetfx_Vista_SP2 / 8.0.50727.4016 / DEVDIV / depot / DevDiv / releases / Orcas / QFE / ndp / fx / src / DataEntity / System / Data / EntityModel / SchemaObjectModel / NavigationProperty.cs / 2 / NavigationProperty.cs
                        
                        
                            //---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// 
// @owner       [....]
// @backupOwner [....] 
//--------------------------------------------------------------------- 

using System; 
using System.Collections.Generic;
using System.Xml;
using System.Data;
using System.Data.Metadata.Edm; 

namespace System.Data.EntityModel.SchemaObjectModel 
{ 
    /// 
    /// Summary description for Association. 
    /// 
    [System.Diagnostics.DebuggerDisplay("Name={Name}, Relationship={_unresolvedRelationshipName}, FromRole={_unresolvedFromEndRole}, ToRole={_unresolvedToEndRole}")]
    internal sealed class NavigationProperty : Property
    { 
        private string _unresolvedFromEndRole = null;
        private string _unresolvedToEndRole = null; 
        private string _unresolvedRelationshipName = null; 
        private IRelationshipEnd _fromEnd = null;
        private IRelationshipEnd _toEnd = null; 
        private IRelationship _relationship = null;

        /// 
        /// 
        /// 
        ///  
        public NavigationProperty(SchemaEntityType parent) 
            : base(parent)
        { 
        }

        /// 
        /// 
        /// 
        public new SchemaEntityType ParentElement 
        { 
            get
            { 
                return base.ParentElement as SchemaEntityType;
            }
        }
 
        internal IRelationship Relationship
        { 
            get { return _relationship; } 
        }
 
        internal IRelationshipEnd ToEnd
        {
            get { return _toEnd; }
        } 

        internal IRelationshipEnd FromEnd 
        { 
            get { return _fromEnd; }
        } 

        /// 
        /// Gets the Type of the property
        ///  
        public override SchemaType Type
        { 
            get 
            {
                if (_toEnd == null || _toEnd.Type == null) 
                {
                    return null;
                }
 
                return _toEnd.Type;
            } 
        } 

        protected override bool HandleAttribute(XmlReader reader) 
        {
            if (base.HandleAttribute(reader))
            {
                return true; 
            }
            else if (CanHandleAttribute(reader, XmlConstants.Relationship)) 
            { 
                HandleAssociationAttribute(reader);
                return true; 
            }
            else if (CanHandleAttribute(reader, XmlConstants.FromRole))
            {
                HandleFromRoleAttribute(reader); 
                return true;
            } 
            else if (CanHandleAttribute(reader, XmlConstants.ToRole)) 
            {
                HandleToRoleAttribute(reader); 
                return true;
            }

            return false; 
        }
 
        ///  
        ///
        ///  
        internal override void ResolveTopLevelNames()
        {
            base.ResolveTopLevelNames();
 
            SchemaType element;
            if (!Schema.ResolveTypeName(this, _unresolvedRelationshipName, out element)) 
                return; 

            _relationship = element as IRelationship; 
            if (_relationship == null)
            {
                AddError(ErrorCode.BadNavigationProperty, EdmSchemaErrorSeverity.Error,
                    System.Data.Entity.Strings.BadNavigationPropertyRelationshipNotRelationship(_unresolvedRelationshipName)); 
                return;
            } 
 
            bool foundBothEnds = true;
            if (!_relationship.TryGetEnd(_unresolvedFromEndRole, out _fromEnd)) 
            {
                AddError(ErrorCode.BadNavigationProperty, EdmSchemaErrorSeverity.Error,
                    System.Data.Entity.Strings.BadNavigationPropertyUndefinedRole(_unresolvedFromEndRole, _relationship.FQName));
                foundBothEnds = false; 
            }
 
            if (!_relationship.TryGetEnd(_unresolvedToEndRole, out _toEnd)) 
            {
                AddError(ErrorCode.BadNavigationProperty, EdmSchemaErrorSeverity.Error, 
                    System.Data.Entity.Strings.BadNavigationPropertyUndefinedRole(_unresolvedToEndRole, _relationship.FQName));

                foundBothEnds = false;
            } 

            if (foundBothEnds && _fromEnd == _toEnd) 
            { 
                AddError(ErrorCode.BadNavigationProperty, EdmSchemaErrorSeverity.Error,
                    System.Data.Entity.Strings.BadNavigationPropertyRolesCannotBeTheSame); 
            }
        }

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

            System.Diagnostics.Debug.Assert(_fromEnd != null && _toEnd != null,
                "FromEnd and ToEnd must not be null in Validate. ResolveNames must have resolved it or added error");
 
            if (_fromEnd.Type != ParentElement)
            { 
                AddError(ErrorCode.BadNavigationProperty, EdmSchemaErrorSeverity.Error, 
                    System.Data.Entity.Strings.BadNavigationPropertyBadFromRoleType(this.Name,
                    _fromEnd.Type.FQName, _fromEnd.Name, _relationship.FQName, ParentElement.FQName)); 
            }

            StructuredType type = _toEnd.Type;
        } 

        #region Private Methods 
        ///  
        ///
        ///  
        /// 
        private void HandleToRoleAttribute(XmlReader reader)
        {
            _unresolvedToEndRole = HandleUndottedNameAttribute(reader, _unresolvedToEndRole); 
        }
        ///  
        /// 
        /// 
        ///  
        private void HandleFromRoleAttribute(XmlReader reader)
        {
            _unresolvedFromEndRole = HandleUndottedNameAttribute(reader, _unresolvedFromEndRole);
        } 
        /// 
        /// 
        ///  
        /// 
        private void HandleAssociationAttribute(XmlReader reader) 
        {
            if (_unresolvedRelationshipName != null)
            {
                AddAlreadyDefinedError(reader); 
                return;
            } 
 
            string association;
            if (!Utils.GetDottedName(this.Schema, reader, out association)) 
                return;

            _unresolvedRelationshipName = association;
        } 

        #endregion 
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
//---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// 
// @owner       [....]
// @backupOwner [....] 
//--------------------------------------------------------------------- 

using System; 
using System.Collections.Generic;
using System.Xml;
using System.Data;
using System.Data.Metadata.Edm; 

namespace System.Data.EntityModel.SchemaObjectModel 
{ 
    /// 
    /// Summary description for Association. 
    /// 
    [System.Diagnostics.DebuggerDisplay("Name={Name}, Relationship={_unresolvedRelationshipName}, FromRole={_unresolvedFromEndRole}, ToRole={_unresolvedToEndRole}")]
    internal sealed class NavigationProperty : Property
    { 
        private string _unresolvedFromEndRole = null;
        private string _unresolvedToEndRole = null; 
        private string _unresolvedRelationshipName = null; 
        private IRelationshipEnd _fromEnd = null;
        private IRelationshipEnd _toEnd = null; 
        private IRelationship _relationship = null;

        /// 
        /// 
        /// 
        ///  
        public NavigationProperty(SchemaEntityType parent) 
            : base(parent)
        { 
        }

        /// 
        /// 
        /// 
        public new SchemaEntityType ParentElement 
        { 
            get
            { 
                return base.ParentElement as SchemaEntityType;
            }
        }
 
        internal IRelationship Relationship
        { 
            get { return _relationship; } 
        }
 
        internal IRelationshipEnd ToEnd
        {
            get { return _toEnd; }
        } 

        internal IRelationshipEnd FromEnd 
        { 
            get { return _fromEnd; }
        } 

        /// 
        /// Gets the Type of the property
        ///  
        public override SchemaType Type
        { 
            get 
            {
                if (_toEnd == null || _toEnd.Type == null) 
                {
                    return null;
                }
 
                return _toEnd.Type;
            } 
        } 

        protected override bool HandleAttribute(XmlReader reader) 
        {
            if (base.HandleAttribute(reader))
            {
                return true; 
            }
            else if (CanHandleAttribute(reader, XmlConstants.Relationship)) 
            { 
                HandleAssociationAttribute(reader);
                return true; 
            }
            else if (CanHandleAttribute(reader, XmlConstants.FromRole))
            {
                HandleFromRoleAttribute(reader); 
                return true;
            } 
            else if (CanHandleAttribute(reader, XmlConstants.ToRole)) 
            {
                HandleToRoleAttribute(reader); 
                return true;
            }

            return false; 
        }
 
        ///  
        ///
        ///  
        internal override void ResolveTopLevelNames()
        {
            base.ResolveTopLevelNames();
 
            SchemaType element;
            if (!Schema.ResolveTypeName(this, _unresolvedRelationshipName, out element)) 
                return; 

            _relationship = element as IRelationship; 
            if (_relationship == null)
            {
                AddError(ErrorCode.BadNavigationProperty, EdmSchemaErrorSeverity.Error,
                    System.Data.Entity.Strings.BadNavigationPropertyRelationshipNotRelationship(_unresolvedRelationshipName)); 
                return;
            } 
 
            bool foundBothEnds = true;
            if (!_relationship.TryGetEnd(_unresolvedFromEndRole, out _fromEnd)) 
            {
                AddError(ErrorCode.BadNavigationProperty, EdmSchemaErrorSeverity.Error,
                    System.Data.Entity.Strings.BadNavigationPropertyUndefinedRole(_unresolvedFromEndRole, _relationship.FQName));
                foundBothEnds = false; 
            }
 
            if (!_relationship.TryGetEnd(_unresolvedToEndRole, out _toEnd)) 
            {
                AddError(ErrorCode.BadNavigationProperty, EdmSchemaErrorSeverity.Error, 
                    System.Data.Entity.Strings.BadNavigationPropertyUndefinedRole(_unresolvedToEndRole, _relationship.FQName));

                foundBothEnds = false;
            } 

            if (foundBothEnds && _fromEnd == _toEnd) 
            { 
                AddError(ErrorCode.BadNavigationProperty, EdmSchemaErrorSeverity.Error,
                    System.Data.Entity.Strings.BadNavigationPropertyRolesCannotBeTheSame); 
            }
        }

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

            System.Diagnostics.Debug.Assert(_fromEnd != null && _toEnd != null,
                "FromEnd and ToEnd must not be null in Validate. ResolveNames must have resolved it or added error");
 
            if (_fromEnd.Type != ParentElement)
            { 
                AddError(ErrorCode.BadNavigationProperty, EdmSchemaErrorSeverity.Error, 
                    System.Data.Entity.Strings.BadNavigationPropertyBadFromRoleType(this.Name,
                    _fromEnd.Type.FQName, _fromEnd.Name, _relationship.FQName, ParentElement.FQName)); 
            }

            StructuredType type = _toEnd.Type;
        } 

        #region Private Methods 
        ///  
        ///
        ///  
        /// 
        private void HandleToRoleAttribute(XmlReader reader)
        {
            _unresolvedToEndRole = HandleUndottedNameAttribute(reader, _unresolvedToEndRole); 
        }
        ///  
        /// 
        /// 
        ///  
        private void HandleFromRoleAttribute(XmlReader reader)
        {
            _unresolvedFromEndRole = HandleUndottedNameAttribute(reader, _unresolvedFromEndRole);
        } 
        /// 
        /// 
        ///  
        /// 
        private void HandleAssociationAttribute(XmlReader reader) 
        {
            if (_unresolvedRelationshipName != null)
            {
                AddAlreadyDefinedError(reader); 
                return;
            } 
 
            string association;
            if (!Utils.GetDottedName(this.Schema, reader, out association)) 
                return;

            _unresolvedRelationshipName = association;
        } 

        #endregion 
    } 
}

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

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