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// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
namespace WixToolset.Dtf.WindowsInstaller
{
using System;
using System.Text;
using System.Collections.Generic;
using System.Diagnostics.CodeAnalysis;
/// <summary>
/// Represents an instance of a feature of an installed product.
/// </summary>
public class FeatureInstallation : InstallationPart
{
/// <summary>
/// Creates a new FeatureInstallation instance for a feature of a product.
/// </summary>
/// <param name="featureName">feature name</param>
/// <param name="productCode">ProductCode GUID</param>
public FeatureInstallation(string featureName, string productCode)
: base(featureName, productCode)
{
if (String.IsNullOrEmpty(featureName))
{
throw new ArgumentNullException("featureName");
}
}
/// <summary>
/// Gets the name of the feature.
/// </summary>
public string FeatureName
{
get
{
return this.Id;
}
}
/// <summary>
/// Gets the installed state of the feature.
/// </summary>
/// <remarks><p>
/// Win32 MSI API:
/// <a href="http://msdn.microsoft.com/library/en-us/msi/setup/msiqueryfeaturestate.asp">MsiQueryFeatureState</a>
/// </p></remarks>
public override InstallState State
{
get
{
int installState = NativeMethods.MsiQueryFeatureState(
this.ProductCode, this.FeatureName);
return (InstallState) installState;
}
}
/// <summary>
/// Gets the parent of the feature, or null if the feature has no parent (it is a root feature).
/// </summary>
/// <remarks>
/// Invocation of this property may be slightly costly for products with many features,
/// because it involves an enumeration of all the features in the product.
/// </remarks>
public FeatureInstallation Parent
{
get
{
StringBuilder featureBuf = new StringBuilder(256);
StringBuilder parentBuf = new StringBuilder(256);
for (uint i = 0; ; i++)
{
uint ret = NativeMethods.MsiEnumFeatures(this.ProductCode, i, featureBuf, parentBuf);
if (ret != 0)
{
break;
}
if (featureBuf.ToString() == this.FeatureName)
{
if (parentBuf.Length > 0)
{
return new FeatureInstallation(parentBuf.ToString(), this.ProductCode);
}
else
{
return null;
}
}
}
return null;
}
}
/// <summary>
/// Gets the usage metrics for the feature.
/// </summary>
/// <remarks><p>
/// If no usage metrics are recorded, the <see cref="UsageData.UseCount" /> value is 0.
/// </p><p>
/// Win32 MSI API:
/// <a href="http://msdn.microsoft.com/library/en-us/msi/setup/msigetfeatureusage.asp">MsiGetFeatureUsage</a>
/// </p></remarks>
public FeatureInstallation.UsageData Usage
{
get
{
uint useCount;
ushort useDate;
uint ret = NativeMethods.MsiGetFeatureUsage(
this.ProductCode, this.FeatureName, out useCount, out useDate);
if (ret != 0)
{
throw InstallerException.ExceptionFromReturnCode(ret);
}
DateTime lastUsedDate;
if (useCount == 0)
{
lastUsedDate = DateTime.MinValue;
}
else
{
lastUsedDate = new DateTime(
1980 + (useDate >> 9),
(useDate & 0x01FF) >> 5,
(useDate & 0x001F));
}
return new UsageData((int) useCount, lastUsedDate);
}
}
/// <summary>
/// Holds data about the usage of a feature.
/// </summary>
[SuppressMessage("Microsoft.Design", "CA1034:NestedTypesShouldNotBeVisible")]
[SuppressMessage("Microsoft.Performance", "CA1815:OverrideEqualsAndOperatorEqualsOnValueTypes")]
public struct UsageData
{
private int useCount;
private DateTime lastUsedDate;
internal UsageData(int useCount, DateTime lastUsedDate)
{
this.useCount = useCount;
this.lastUsedDate = lastUsedDate;
}
/// <summary>
/// Gets count of the number of times the feature has been used.
/// </summary>
public int UseCount
{
get
{
return this.useCount;
}
}
/// <summary>
/// Gets the date the feature was last used.
/// </summary>
public DateTime LastUsedDate
{
get
{
return this.lastUsedDate;
}
}
}
}
}
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