ApplicationId.cs

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using System.Diagnostics.CodeAnalysis;
using System.Text;
 
namespace System;
 
public sealed class ApplicationId
{
    private readonly byte[] _publicKeyToken;
 
    public string? Culture { get; }
 
    public string Name { get; }
 
    public string? ProcessorArchitecture { get; }
 
    public Version Version { get; }
 
    public byte[] PublicKeyToken => (byte[])_publicKeyToken.Clone();
 
    public ApplicationId(byte[] publicKeyToken, string name, Version version, string? processorArchitecture, string? culture)
    {
        if (name == null)
        {
            throw new ArgumentNullException("name");
        }
        if (name.Length == 0)
        {
            throw new ArgumentException(SR.Argument_EmptyApplicationName);
        }
        if (version == null)
        {
            throw new ArgumentNullException("version");
        }
        if (publicKeyToken == null)
        {
            throw new ArgumentNullException("publicKeyToken");
        }
        _publicKeyToken = (byte[])publicKeyToken.Clone();
        Name = name;
        Version = version;
        ProcessorArchitecture = processorArchitecture;
        Culture = culture;
    }
 
    public ApplicationId Copy()
    {
        return new ApplicationId(_publicKeyToken, Name, Version, ProcessorArchitecture, Culture);
    }
 
    public override string ToString()
    {
        Span<char> initialBuffer = stackalloc char[128];
        ValueStringBuilder valueStringBuilder = new ValueStringBuilder(initialBuffer);
        valueStringBuilder.Append(Name);
        if (Culture != null)
        {
            valueStringBuilder.Append(", culture=\"");
            valueStringBuilder.Append(Culture);
            valueStringBuilder.Append('"');
        }
        valueStringBuilder.Append(", version=\"");
        valueStringBuilder.Append(Version.ToString());
        valueStringBuilder.Append('"');
        if (_publicKeyToken != null)
        {
            valueStringBuilder.Append(", publicKeyToken=\"");
            HexConverter.EncodeToUtf16(_publicKeyToken, valueStringBuilder.AppendSpan(2 * _publicKeyToken.Length));
            valueStringBuilder.Append('"');
        }
        if (ProcessorArchitecture != null)
        {
            valueStringBuilder.Append(", processorArchitecture =\"");
            valueStringBuilder.Append(ProcessorArchitecture);
            valueStringBuilder.Append('"');
        }
        return valueStringBuilder.ToString();
    }
 
    public override bool Equals([NotNullWhen(true)] object? o)
    {
        if (!(o is ApplicationId applicationId))
        {
            return false;
        }
        if (!object.Equals(Name, applicationId.Name) || !object.Equals(Version, applicationId.Version) || !object.Equals(ProcessorArchitecture, applicationId.ProcessorArchitecture) || !object.Equals(Culture, applicationId.Culture))
        {
            return false;
        }
        if (_publicKeyToken.Length != applicationId._publicKeyToken.Length)
        {
            return false;
        }
        for (int i = 0; i < _publicKeyToken.Length; i++)
        {
            if (_publicKeyToken[i] != applicationId._publicKeyToken[i])
            {
                return false;
            }
        }
        return true;
    }
 
    public override int GetHashCode()
    {
        return Name.GetHashCode() ^ Version.GetHashCode();
    }
}