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//-----------------------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
//-----------------------------------------------------------------------------
namespace System.Activities.DynamicUpdate
{
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Runtime;
using System.Runtime.Serialization;
using System.ComponentModel;
[DataContract]
internal class EnvironmentUpdateMapEntry
{
internal const int NonExistent = -1;
public EnvironmentUpdateMapEntry()
{
}
[DataMember(EmitDefaultValue = false)]
public int OldOffset
{
get;
set;
}
[DataMember(EmitDefaultValue = false)]
public int NewOffset
{
get;
set;
}
[DataMember(EmitDefaultValue = false)]
public bool IsNewHandle
{
get;
set;
}
internal bool IsAddition
{
get
{
return this.OldOffset == EnvironmentUpdateMapEntry.NonExistent;
}
}
internal static EnvironmentUpdateMapEntry Merge(EnvironmentUpdateMapEntry first, EnvironmentUpdateMapEntry second)
{
if (first == null || second == null)
{
return first ?? second;
}
Fx.Assert(first.NewOffset == second.OldOffset && !second.IsAddition, "Merging mismatched entries");
if (first.OldOffset == second.NewOffset)
{
return null;
}
return new EnvironmentUpdateMapEntry
{
OldOffset = first.OldOffset,
NewOffset = second.NewOffset,
IsNewHandle = first.IsNewHandle
};
}
}
}
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