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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System.Collections.Generic;
using Microsoft.Build.Framework;
using Microsoft.Build.Shared;
#nullable disable
namespace Microsoft.Build.Engine.UnitTests.TestComparers
{
/// <summary>
/// Implementation of IComparer on ITaskItems used for testing.
/// </summary>
public class TaskItemComparer : IComparer<ITaskItem>
{
/// <summary>
/// Constructor.
/// </summary>
private TaskItemComparer()
{
}
/// <summary>
/// Retrieves a new instance of the class.
/// </summary>
public static IComparer<ITaskItem> Instance
{
get { return new TaskItemComparer(); }
}
#region IComparer<ITaskItem> Members
/// <summary>
/// Compares two task items.
/// Built-in derivable metadata is ignored as it might not be copied.
/// </summary>
/// <returns>0 if they are equal, -1 otherwise.</returns>
public int Compare(ITaskItem x, ITaskItem y)
{
if (x.ItemSpec != y.ItemSpec)
{
return -1;
}
if (x.CloneCustomMetadata().Count != y.CloneCustomMetadata().Count)
{
return -1;
}
foreach (string metadataName in x.MetadataNames)
{
if (!FileUtilities.ItemSpecModifiers.IsItemSpecModifier(metadataName) ||
FileUtilities.ItemSpecModifiers.IsDerivableItemSpecModifier(metadataName))
{
if (x.GetMetadata(metadataName) != y.GetMetadata(metadataName))
{
return -1;
}
}
}
foreach (string metadataName in y.MetadataNames)
{
if (!FileUtilities.ItemSpecModifiers.IsItemSpecModifier(metadataName) ||
FileUtilities.ItemSpecModifiers.IsDerivableItemSpecModifier(metadataName))
{
if (x.GetMetadata(metadataName) != y.GetMetadata(metadataName))
{
return -1;
}
}
}
return 0;
}
#endregion
}
}
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