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//-----------------------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
//-----------------------------------------------------------------------------
namespace System.Activities
{
using System;
using System.Activities.Hosting;
using System.Globalization;
using System.Runtime;
using System.Runtime.Serialization;
[DataContract]
[Fx.Tag.XamlVisible(false)]
public sealed class BookmarkScope : IEquatable<BookmarkScope>
{
static BookmarkScope defaultBookmarkScope;
long temporaryId;
Guid id;
int handleReferenceCount;
internal BookmarkScope(long temporaryId)
{
Fx.Assert(temporaryId != default(long), "Should never call this constructor with the default value.");
this.temporaryId = temporaryId;
}
public BookmarkScope(Guid id)
{
this.id = id;
}
BookmarkScope()
{
// Only called for making the default sub instance
// which has an Id of Guid.Empty
}
public bool IsInitialized
{
get
{
return this.temporaryId == default(long);
}
}
public Guid Id
{
get
{
return this.id;
}
internal set
{
Fx.Assert(value != Guid.Empty, "Cannot set this to Guid.Empty.");
Fx.Assert(!this.IsInitialized, "Can only set this when uninitialized.");
this.id = value;
this.temporaryId = default(long);
}
}
internal int IncrementHandleReferenceCount()
{
return ++this.handleReferenceCount;
}
internal int DecrementHandleReferenceCount()
{
return --this.handleReferenceCount;
}
[DataMember(EmitDefaultValue = false, Name = "temporaryId")]
internal long SerializedTemporaryId
{
get { return this.temporaryId; }
set { this.temporaryId = value; }
}
[DataMember(EmitDefaultValue = false, Name = "id")]
internal Guid SerializedId
{
get { return this.id; }
set { this.id = value; }
}
internal long TemporaryId
{
get
{
return this.temporaryId;
}
}
public static BookmarkScope Default
{
get
{
if (defaultBookmarkScope == null)
{
defaultBookmarkScope = new BookmarkScope();
}
return defaultBookmarkScope;
}
}
internal bool IsDefault
{
get
{
// In the strictest sense the default is not initiailized.
// The Default BookmarkScope is really just a loose reference
// to the instance specific default that you can get to
// through NativeActivityContext.DefaultBookmarkScope.
// We use a scope initialized to Guid.Empty to signify this
// "loose reference".
return this.IsInitialized && this.id == Guid.Empty;
}
}
public void Initialize(NativeActivityContext context, Guid id)
{
if (context == null)
{
throw FxTrace.Exception.ArgumentNull("context");
}
if (id == Guid.Empty)
{
throw FxTrace.Exception.ArgumentNullOrEmpty("id");
}
if (this.IsInitialized)
{
throw FxTrace.Exception.AsError(new InvalidOperationException(SR.BookmarkScopeAlreadyInitialized));
}
context.InitializeBookmarkScope(this, id);
}
public override int GetHashCode()
{
if (this.IsInitialized)
{
return this.id.GetHashCode();
}
else
{
return this.temporaryId.GetHashCode();
}
}
internal BookmarkScopeInfo GenerateScopeInfo()
{
if (this.IsInitialized)
{
return new BookmarkScopeInfo(this.Id);
}
else
{
return new BookmarkScopeInfo(this.temporaryId.ToString(CultureInfo.InvariantCulture));
}
}
public bool Equals(BookmarkScope other)
{
if (other == null)
{
return false;
}
if (object.ReferenceEquals(this, other))
{
return true;
}
if (this.IsDefault)
{
return other.IsDefault;
}
else if (this.IsInitialized)
{
Fx.Assert(this.id != Guid.Empty, "If we're not the default but we're initialized then we must have a non-Empty Guid.");
if (other.id == this.id)
{
return true;
}
else
{
return false;
}
}
else
{
Fx.Assert(this.temporaryId != 0, "We should have a non-zero temp id if we're not the default and not initialized.");
if (other.temporaryId == this.temporaryId)
{
return true;
}
else
{
return false;
}
}
}
}
}
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