54 lines
2.1 KiB
C#
54 lines
2.1 KiB
C#
using System;
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using System.Collections.Generic;
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namespace Discord
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{
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/// <summary>
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/// Represents a collection of <see cref="IEqualityComparer{T}"/> for various Discord objects.
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/// </summary>
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public static class DiscordComparers
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{
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/// <summary>
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/// Gets an <see cref="IEqualityComparer{T}"/> to be used to compare users.
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/// </summary>
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public static IEqualityComparer<IUser> UserComparer { get; } = new EntityEqualityComparer<IUser, ulong>();
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/// <summary>
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/// Gets an <see cref="IEqualityComparer{T}"/> to be used to compare guilds.
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/// </summary>
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public static IEqualityComparer<IGuild> GuildComparer { get; } = new EntityEqualityComparer<IGuild, ulong>();
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/// <summary>
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/// Gets an <see cref="IEqualityComparer{T}"/> to be used to compare channels.
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/// </summary>
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public static IEqualityComparer<IChannel> ChannelComparer { get; } = new EntityEqualityComparer<IChannel, ulong>();
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/// <summary>
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/// Gets an <see cref="IEqualityComparer{T}"/> to be used to compare roles.
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/// </summary>
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public static IEqualityComparer<IRole> RoleComparer { get; } = new EntityEqualityComparer<IRole, ulong>();
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/// <summary>
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/// Gets an <see cref="IEqualityComparer{T}"/> to be used to compare messages.
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/// </summary>
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public static IEqualityComparer<IMessage> MessageComparer { get; } = new EntityEqualityComparer<IMessage, ulong>();
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private sealed class EntityEqualityComparer<TEntity, TId> : EqualityComparer<TEntity>
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where TEntity : IEntity<TId>
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where TId : IEquatable<TId>
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{
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public override bool Equals(TEntity x, TEntity y)
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{
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return (x, y) switch
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{
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(null, null) => true,
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(null, _) => false,
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(_, null) => false,
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_ => x.Id.Equals(y.Id)
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};
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}
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public override int GetHashCode(TEntity obj)
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{
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return obj?.Id.GetHashCode() ?? 0;
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}
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}
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}
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}
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