File size: 2,200 Bytes
8c763fb | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 | // Copyright (c) Microsoft Corporation.
// Licensed under the MIT License.
using Dbg = System.Management.Automation.Diagnostics;
namespace System.Management.Automation.Remoting
{
/// <summary>
/// The purpose of this class is to hide an object (mask it) and replace it
/// with a substitute temporarily. This is used in pushing and popping
/// runspaces. It is also used to temporarily set a PowerShell object's host as
/// the Runspace object's host when the PowerShell object is executed.
/// </summary>
internal class ObjectRef<T> where T : class
{
/// <summary>
/// New value.
/// </summary>
private T _newValue;
/// <summary>
/// Old value.
/// </summary>
private readonly T _oldValue;
/// <summary>
/// Old value.
/// </summary>
internal T OldValue
{
get
{
return _oldValue;
}
}
/// <summary>
/// Value.
/// </summary>
internal T Value
{
get
{
if (_newValue == null)
{
return _oldValue;
}
else
{
return _newValue;
}
}
}
/// <summary>
/// Is overridden.
/// </summary>
internal bool IsOverridden
{
get
{
return _newValue != null;
}
}
/// <summary>
/// Constructor for ObjectRef.
/// </summary>
internal ObjectRef(T oldValue)
{
Dbg.Assert(oldValue != null, "Expected oldValue != null");
_oldValue = oldValue;
}
/// <summary>
/// Override.
/// </summary>
internal void Override(T newValue)
{
Dbg.Assert(newValue != null, "Expected newValue != null");
_newValue = newValue;
}
/// <summary>
/// Revert.
/// </summary>
internal void Revert()
{
_newValue = null;
}
}
}
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