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//-----------------------------------------------------------------------------
// 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<Bookmark>
{
static Bookmark asyncOperationCompletionBookmark = new Bookmark(-1);
static IEqualityComparer<Bookmark> comparer;
//Used only when exclusive scopes are involved
ExclusiveHandleList exclusiveHandlesThatReferenceThis;
long id;
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<Bookmark> Comparer
{
get
{
if (comparer == null)
{
comparer = new BookmarkComparer();
}
return comparer;
}
}
[DataMember(EmitDefaultValue = false, Name = "exclusiveHandlesThatReferenceThis", Order = 2)]
internal ExclusiveHandleList SerializedExclusiveHandlesThatReferenceThis
{
get { return this.exclusiveHandlesThatReferenceThis; }
set { this.exclusiveHandlesThatReferenceThis = value; }
}
[DataMember(EmitDefaultValue = false, Name = "id", Order = 0)]
internal long SerializedId
{
get { return this.id; }
set { this.id = value; }
}
[DataMember(EmitDefaultValue = false, Name = "externalName", Order = 1)]
internal string SerializedExternalName
{
get { return this.externalName; }
set { this.externalName = value; }
}
[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]
internal class BookmarkComparer : IEqualityComparer<Bookmark>
{
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();
}
}
}
}
|
