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64 lines
2.7 KiB
64 lines
2.7 KiB
4 years ago
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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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// TODO: simplify with '??=' slated for C# 8.0
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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 => _userComparer ?? (_userComparer = 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 => _guildComparer ?? (_guildComparer = 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 => _channelComparer ?? (_channelComparer = 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 => _roleComparer ?? (_roleComparer = 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 => _messageComparer ?? (_messageComparer = new EntityEqualityComparer<IMessage, ulong>());
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private static IEqualityComparer<IUser> _userComparer;
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private static IEqualityComparer<IGuild> _guildComparer;
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private static IEqualityComparer<IChannel> _channelComparer;
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private static IEqualityComparer<IRole> _roleComparer;
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private static IEqualityComparer<IMessage> _messageComparer;
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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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bool xNull = x == null;
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bool yNull = y == null;
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if (xNull && yNull)
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return true;
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if (xNull ^ yNull)
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return false;
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return x.Id.Equals(y.Id);
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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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