Bookmark.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / NetFx40 / System.Activities / System / Activities / Bookmark.cs / 1305376 / Bookmark.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//-----------------------------------------------------------------------------

namespace System.Activities 
{
    using System; 
    using System.Activities.Hosting; 
    using System.Activities.Runtime;
    using System.Collections.Generic; 
    using System.Runtime;
    using System.Runtime.Serialization;
    using System.Globalization;
 
    [DataContract]
    [Fx.Tag.XamlVisible(false)] 
    public class Bookmark : IEquatable 
    {
        static Bookmark asyncOperationCompletionBookmark = new Bookmark(-1); 
        static IEqualityComparer comparer;

        //Used only when exclusive scopes are involved
        [DataMember(EmitDefaultValue = false, Order = 2)] 
        ExclusiveHandleList exclusiveHandlesThatReferenceThis;
 
        [DataMember(EmitDefaultValue = false, Order = 0)] 
        long id;
 
        [DataMember(EmitDefaultValue = false, Order = 1)]
        string externalName;

        Bookmark(long id) 
        {
            Fx.Assert(id != 0, "id should not be zero"); 
            this.id = id; 
        }
 
        public Bookmark(string name)
        {
            if (string.IsNullOrEmpty(name))
            { 
                throw FxTrace.Exception.ArgumentNullOrEmpty("name");
            } 
 
            this.externalName = name;
        } 

        internal static Bookmark AsyncOperationCompletionBookmark
        {
            get 
            {
                return asyncOperationCompletionBookmark; 
            } 
        }
 
        internal static IEqualityComparer Comparer
        {
            get
            { 
                if (comparer == null)
                { 
                    comparer = new BookmarkComparer(); 
                }
 
                return comparer;
            }
        }
 
        [DataMember(EmitDefaultValue = false)]
        internal BookmarkScope Scope 
        { 
            get;
            set; 
        }

        internal bool IsNamed
        { 
            get
            { 
                return this.id == 0; 
            }
        } 

        public string Name
        {
            get 
            {
                if (this.IsNamed) 
                { 
                    return this.externalName;
                } 
                else
                {
                    return string.Empty;
                } 
            }
        } 
 
        internal long Id
        { 
            get
            {
                Fx.Assert(!this.IsNamed, "We should only get the id for unnamed bookmarks.");
 
                return this.id;
            } 
        } 

        internal ExclusiveHandleList ExclusiveHandles 
        {
            get
            {
                return this.exclusiveHandlesThatReferenceThis; 
            }
            set 
            { 
                this.exclusiveHandlesThatReferenceThis = value;
            } 
        }


        internal static Bookmark Create(long id) 
        {
            return new Bookmark(id); 
        } 

        internal BookmarkInfo GenerateBookmarkInfo(BookmarkCallbackWrapper bookmarkCallback) 
        {
            Fx.Assert(this.IsNamed, "Can only generate BookmarkInfo for external bookmarks");

            BookmarkScopeInfo scopeInfo = null; 

            if (this.Scope != null) 
            { 
                scopeInfo = this.Scope.GenerateScopeInfo();
            } 

            return new BookmarkInfo(this.externalName, bookmarkCallback.ActivityInstance.Activity.DisplayName, scopeInfo);
        }
 
        public bool Equals(Bookmark other)
        { 
            if (object.ReferenceEquals(other, null)) 
            {
                return false; 
            }

            if (this.IsNamed)
            { 
                return other.IsNamed && this.externalName == other.externalName;
            } 
            else 
            {
                return this.id == other.id; 
            }
        }

        public override bool Equals(object obj) 
        {
            return this.Equals(obj as Bookmark); 
        } 

        public override int GetHashCode() 
        {
            if (this.IsNamed)
            {
                return this.externalName.GetHashCode(); 
            }
            else 
            { 
                return this.id.GetHashCode();
            } 
        }

        public override string ToString()
        { 
            if (this.IsNamed)
            { 
                return this.Name; 
            }
            else 
            {
                return this.Id.ToString(CultureInfo.InvariantCulture);
            }
        } 

        [DataContract] 
        class BookmarkComparer : IEqualityComparer 
        {
            public BookmarkComparer() 
            {
            }

            public bool Equals(Bookmark x, Bookmark y) 
            {
                if (object.ReferenceEquals(x, null)) 
                { 
                    return object.ReferenceEquals(y, null);
                } 

                return x.Equals(y);
            }
 
            public int GetHashCode(Bookmark obj)
            { 
                return obj.GetHashCode(); 
            }
        } 
    }
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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