You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
64 lines
2.7 KiB
64 lines
2.7 KiB
using System;
|
|
using System.Collections.Generic;
|
|
|
|
namespace Discord
|
|
{
|
|
/// <summary>
|
|
/// Represents a collection of <see cref="IEqualityComparer{T}"/> for various Discord objects.
|
|
/// </summary>
|
|
public static class DiscordComparers
|
|
{
|
|
// TODO: simplify with '??=' slated for C# 8.0
|
|
/// <summary>
|
|
/// Gets an <see cref="IEqualityComparer{T}"/> to be used to compare users.
|
|
/// </summary>
|
|
public static IEqualityComparer<IUser> UserComparer => _userComparer ?? (_userComparer = new EntityEqualityComparer<IUser, ulong>());
|
|
/// <summary>
|
|
/// Gets an <see cref="IEqualityComparer{T}"/> to be used to compare guilds.
|
|
/// </summary>
|
|
public static IEqualityComparer<IGuild> GuildComparer => _guildComparer ?? (_guildComparer = new EntityEqualityComparer<IGuild, ulong>());
|
|
/// <summary>
|
|
/// Gets an <see cref="IEqualityComparer{T}"/> to be used to compare channels.
|
|
/// </summary>
|
|
public static IEqualityComparer<IChannel> ChannelComparer => _channelComparer ?? (_channelComparer = new EntityEqualityComparer<IChannel, ulong>());
|
|
/// <summary>
|
|
/// Gets an <see cref="IEqualityComparer{T}"/> to be used to compare roles.
|
|
/// </summary>
|
|
public static IEqualityComparer<IRole> RoleComparer => _roleComparer ?? (_roleComparer = new EntityEqualityComparer<IRole, ulong>());
|
|
/// <summary>
|
|
/// Gets an <see cref="IEqualityComparer{T}"/> to be used to compare messages.
|
|
/// </summary>
|
|
public static IEqualityComparer<IMessage> MessageComparer => _messageComparer ?? (_messageComparer = new EntityEqualityComparer<IMessage, ulong>());
|
|
|
|
private static IEqualityComparer<IUser> _userComparer;
|
|
private static IEqualityComparer<IGuild> _guildComparer;
|
|
private static IEqualityComparer<IChannel> _channelComparer;
|
|
private static IEqualityComparer<IRole> _roleComparer;
|
|
private static IEqualityComparer<IMessage> _messageComparer;
|
|
|
|
private sealed class EntityEqualityComparer<TEntity, TId> : EqualityComparer<TEntity>
|
|
where TEntity : IEntity<TId>
|
|
where TId : IEquatable<TId>
|
|
{
|
|
public override bool Equals(TEntity x, TEntity y)
|
|
{
|
|
bool xNull = x == null;
|
|
bool yNull = y == null;
|
|
|
|
if (xNull && yNull)
|
|
return true;
|
|
|
|
if (xNull ^ yNull)
|
|
return false;
|
|
|
|
return x.Id.Equals(y.Id);
|
|
}
|
|
|
|
public override int GetHashCode(TEntity obj)
|
|
{
|
|
return obj?.Id.GetHashCode() ?? 0;
|
|
}
|
|
}
|
|
}
|
|
}
|