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