RelationshipNavigation.cs source code in C# .NET

                        Code:
                         / Dotnetfx_Win7_3.5.1 / Dotnetfx_Win7_3.5.1 / 3.5.1 / DEVDIV / depot / DevDiv / releases / Orcas / NetFXw7 / ndp / fx / src / DataEntity / System / Data / Objects / DataClasses / RelationshipNavigation.cs / 1 / RelationshipNavigation.cs
                        
                        
                            //---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// 
// @owner       [....]
// @backupOwner [....] 
//--------------------------------------------------------------------- 

using System; 
using System.Collections.Generic;
using System.Data.Common;
using System.Globalization;
using System.Text; 

namespace System.Data.Objects.DataClasses 
{ 
    /// 
    /// This class describes a relationship navigation from the 
    /// navigation property on one entity to another entity.  It is
    /// used throughout the collections and refs system to describe a
    /// relationship and to connect from the navigation property on
    /// one end of a relationship to the navigation property on the 
    /// other end.
    ///  
 
    // devnote: Might be able to change this back to a valuetype given its current purpose
 
    [Serializable]
    internal class RelationshipNavigation
    {
        // ------------ 
        // Constructors
        // ------------ 
 
        /// 
        /// Creates a navigation object with the given relationship 
        /// name, role name for the source and role name for the
        /// destination.
        /// 
        /// Canonical-space name of the relationship. 
        /// Name of the role/navigation property which is the source of the navigation.
        /// Name of the role/navigation property which is the destination of the navigation. 
        internal RelationshipNavigation(string relationshipName, string from, string to) 
        {
            EntityUtil.CheckStringArgument(relationshipName, "relationshipName"); 
            EntityUtil.CheckStringArgument(from, "from");
            EntityUtil.CheckStringArgument(to, "to");

            _relationshipName = relationshipName; 
            _from = from;
            _to = to; 
        } 

        // ------ 
        // Fields
        // ------

        // The following fields are serialized.  Adding or removing a serialized field is considered 
        // a breaking change.  This includes changing the field type or field name of existing
        // serialized fields. If you need to make this kind of change, it may be possible, but it 
        // will require some custom serialization/deserialization code. 
        private readonly string _relationshipName;
        private readonly string _from; 
        private readonly string _to;

        [NonSerialized]
        private RelationshipNavigation _reverse; 

 
        // ---------- 
        // Properties
        // ---------- 

        /// 
        /// Canonical-space relationship name.
        ///  
        internal string RelationshipName
        { 
            get 
            {
                return _relationshipName; 
            }
        }

        ///  
        /// Role/navigation property name for the source of this navigation.
        ///  
        internal string From 
        {
            get 
            {
                return _from;
            }
        } 

        ///  
        /// Role/navigation property name for the destination of this navigation. 
        /// 
        internal string To 
        {
            get
            {
                return _to; 
            }
        } 
 
        /// 
        /// The "reverse" version of this navigation. 
        /// 
        internal RelationshipNavigation Reverse
        {
            get 
            {
                if (_reverse == null) 
                { 
                    // the reverse relationship is exactly like this
                    // one but from & to are switched 
                    _reverse = new RelationshipNavigation(_relationshipName, _to, _from);
                }

                return _reverse; 
            }
 
        } 

        ///  
        /// Compares this instance to a given Navigation by their values.
        /// 
        public override bool Equals(object obj)
        { 
                RelationshipNavigation compareTo = obj as RelationshipNavigation;
                return ((this == compareTo) 
                        || ((null != this) && (null != compareTo) 
                            && (this.RelationshipName == compareTo.RelationshipName)
                            && (this.From == compareTo.From) 
                            && (this.To == compareTo.To)));
        }

        ///  
        /// Returns a value-based hash code.
        ///  
        /// the hash value of this Navigation 
        public override int GetHashCode()
        { 
                return this.RelationshipName.GetHashCode();
        }

        // ------- 
        // Methods
        // ------- 
 
        /// 
        /// ToString is provided to simplify debugging, etc. 
        /// 
        public override string ToString()
        {
            return String.Format(CultureInfo.InvariantCulture, 
                                 "RelationshipNavigation: ({0},{1},{2})",
                                 _relationshipName, 
                                 _from, 
                                 _to);
        } 
    }
}

// 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.Data.Common;
using System.Globalization;
using System.Text; 

namespace System.Data.Objects.DataClasses 
{ 
    /// 
    /// This class describes a relationship navigation from the 
    /// navigation property on one entity to another entity.  It is
    /// used throughout the collections and refs system to describe a
    /// relationship and to connect from the navigation property on
    /// one end of a relationship to the navigation property on the 
    /// other end.
    ///  
 
    // devnote: Might be able to change this back to a valuetype given its current purpose
 
    [Serializable]
    internal class RelationshipNavigation
    {
        // ------------ 
        // Constructors
        // ------------ 
 
        /// 
        /// Creates a navigation object with the given relationship 
        /// name, role name for the source and role name for the
        /// destination.
        /// 
        /// Canonical-space name of the relationship. 
        /// Name of the role/navigation property which is the source of the navigation.
        /// Name of the role/navigation property which is the destination of the navigation. 
        internal RelationshipNavigation(string relationshipName, string from, string to) 
        {
            EntityUtil.CheckStringArgument(relationshipName, "relationshipName"); 
            EntityUtil.CheckStringArgument(from, "from");
            EntityUtil.CheckStringArgument(to, "to");

            _relationshipName = relationshipName; 
            _from = from;
            _to = to; 
        } 

        // ------ 
        // Fields
        // ------

        // The following fields are serialized.  Adding or removing a serialized field is considered 
        // a breaking change.  This includes changing the field type or field name of existing
        // serialized fields. If you need to make this kind of change, it may be possible, but it 
        // will require some custom serialization/deserialization code. 
        private readonly string _relationshipName;
        private readonly string _from; 
        private readonly string _to;

        [NonSerialized]
        private RelationshipNavigation _reverse; 

 
        // ---------- 
        // Properties
        // ---------- 

        /// 
        /// Canonical-space relationship name.
        ///  
        internal string RelationshipName
        { 
            get 
            {
                return _relationshipName; 
            }
        }

        ///  
        /// Role/navigation property name for the source of this navigation.
        ///  
        internal string From 
        {
            get 
            {
                return _from;
            }
        } 

        ///  
        /// Role/navigation property name for the destination of this navigation. 
        /// 
        internal string To 
        {
            get
            {
                return _to; 
            }
        } 
 
        /// 
        /// The "reverse" version of this navigation. 
        /// 
        internal RelationshipNavigation Reverse
        {
            get 
            {
                if (_reverse == null) 
                { 
                    // the reverse relationship is exactly like this
                    // one but from & to are switched 
                    _reverse = new RelationshipNavigation(_relationshipName, _to, _from);
                }

                return _reverse; 
            }
 
        } 

        ///  
        /// Compares this instance to a given Navigation by their values.
        /// 
        public override bool Equals(object obj)
        { 
                RelationshipNavigation compareTo = obj as RelationshipNavigation;
                return ((this == compareTo) 
                        || ((null != this) && (null != compareTo) 
                            && (this.RelationshipName == compareTo.RelationshipName)
                            && (this.From == compareTo.From) 
                            && (this.To == compareTo.To)));
        }

        ///  
        /// Returns a value-based hash code.
        ///  
        /// the hash value of this Navigation 
        public override int GetHashCode()
        { 
                return this.RelationshipName.GetHashCode();
        }

        // ------- 
        // Methods
        // ------- 
 
        /// 
        /// ToString is provided to simplify debugging, etc. 
        /// 
        public override string ToString()
        {
            return String.Format(CultureInfo.InvariantCulture, 
                                 "RelationshipNavigation: ({0},{1},{2})",
                                 _relationshipName, 
                                 _from, 
                                 _to);
        } 
    }
}

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

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