LinkDescriptor.cs source code in C# .NET

                        Code:
                         / Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / Orcas / SP / ndp / fx / src / DataWeb / Client / System / Data / Services / Client / LinkDescriptor.cs / 4 / LinkDescriptor.cs
                        
                        
                            //---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//  
// represents the association between two entities
//  
//--------------------------------------------------------------------- 

namespace System.Data.Services.Client 
{
    using System.Diagnostics;

    ///  
    /// represents the association between two entities
    ///  
    public sealed class LinkDescriptor : Descriptor 
    {
        /// equivalence comparer 
        internal static readonly System.Collections.Generic.IEqualityComparer EquivalentComparer = new Equivalent();

        /// source entity
        private readonly object source; 

        /// name of property on source entity that references the target entity 
        private readonly string sourceProperty; 

        /// target entity 
        private readonly object target;

        /// 
        /// constructor 
        /// 
        /// source entity 
        /// name of property on source entity that references the target entity 
        /// target entity
        /// link state 
        internal LinkDescriptor(object source, string sourceProperty, object target, EntityStates state)
            : base(state)
        {
            this.source = source; 
            this.sourceProperty = sourceProperty;
            this.target = target; 
 
            Debug.Assert(null != source, "null != source");
            Debug.Assert(!string.IsNullOrEmpty(sourceProperty), "null != sourceProperty"); 
            Debug.Assert(null != target || (EntityStates.Unchanged == state) || (EntityStates.Modified == state) || (EntityStates.Detached == state), "null != target");
            Debug.Assert(
                EntityStates.Added == state ||
                EntityStates.Modified == state || 
                EntityStates.Deleted == state ||
                EntityStates.Unchanged == state || 
                EntityStates.Detached == state, 
                "state");
        } 

        /// target entity
        public object Target
        { 
            get { return this.target; }
        } 
 
        /// source entity
        public object Source 
        {
            get { return this.source; }
        }
 
        /// name of property on source entity that references the target entity
        public string SourceProperty 
        { 
            get { return this.sourceProperty; }
        } 

        /// equivalence comparer
        private sealed class Equivalent : System.Collections.Generic.IEqualityComparer
        { 
            /// are two LinkDescriptors equivalent, ignore state
            /// link descriptor x 
            /// link descriptor y 
            /// true if equivalent
            public bool Equals(LinkDescriptor x, LinkDescriptor y) 
            {
                return (x.Source == y.Source) &&
                       (x.Target == y.Target) &&
                       (x.SourceProperty == y.SourceProperty); 
            }
 
            /// compute hashcode for LinkDescriptor 
            /// link descriptor
            /// hashcode 
            public int GetHashCode(LinkDescriptor obj)
            {
                return obj.Source.GetHashCode() ^ ((null != obj.Target) ? obj.Target.GetHashCode() : 0) ^ obj.SourceProperty.GetHashCode();
            } 
        }
    } 
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
//---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//  
// represents the association between two entities
//  
//--------------------------------------------------------------------- 

namespace System.Data.Services.Client 
{
    using System.Diagnostics;

    ///  
    /// represents the association between two entities
    ///  
    public sealed class LinkDescriptor : Descriptor 
    {
        /// equivalence comparer 
        internal static readonly System.Collections.Generic.IEqualityComparer EquivalentComparer = new Equivalent();

        /// source entity
        private readonly object source; 

        /// name of property on source entity that references the target entity 
        private readonly string sourceProperty; 

        /// target entity 
        private readonly object target;

        /// 
        /// constructor 
        /// 
        /// source entity 
        /// name of property on source entity that references the target entity 
        /// target entity
        /// link state 
        internal LinkDescriptor(object source, string sourceProperty, object target, EntityStates state)
            : base(state)
        {
            this.source = source; 
            this.sourceProperty = sourceProperty;
            this.target = target; 
 
            Debug.Assert(null != source, "null != source");
            Debug.Assert(!string.IsNullOrEmpty(sourceProperty), "null != sourceProperty"); 
            Debug.Assert(null != target || (EntityStates.Unchanged == state) || (EntityStates.Modified == state) || (EntityStates.Detached == state), "null != target");
            Debug.Assert(
                EntityStates.Added == state ||
                EntityStates.Modified == state || 
                EntityStates.Deleted == state ||
                EntityStates.Unchanged == state || 
                EntityStates.Detached == state, 
                "state");
        } 

        /// target entity
        public object Target
        { 
            get { return this.target; }
        } 
 
        /// source entity
        public object Source 
        {
            get { return this.source; }
        }
 
        /// name of property on source entity that references the target entity
        public string SourceProperty 
        { 
            get { return this.sourceProperty; }
        } 

        /// equivalence comparer
        private sealed class Equivalent : System.Collections.Generic.IEqualityComparer
        { 
            /// are two LinkDescriptors equivalent, ignore state
            /// link descriptor x 
            /// link descriptor y 
            /// true if equivalent
            public bool Equals(LinkDescriptor x, LinkDescriptor y) 
            {
                return (x.Source == y.Source) &&
                       (x.Target == y.Target) &&
                       (x.SourceProperty == y.SourceProperty); 
            }
 
            /// compute hashcode for LinkDescriptor 
            /// link descriptor
            /// hashcode 
            public int GetHashCode(LinkDescriptor obj)
            {
                return obj.Source.GetHashCode() ^ ((null != obj.Target) ? obj.Target.GetHashCode() : 0) ^ obj.SourceProperty.GetHashCode();
            } 
        }
    } 
} 

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

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