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MessageReaction.java
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MessageReaction.java
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/*
* Copyright 2015-2019 Austin Keener, Michael Ritter, Florian Spieß, and the JDA contributors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package net.dv8tion.jda.api.entities;
import net.dv8tion.jda.api.JDA;
import net.dv8tion.jda.api.Permission;
import net.dv8tion.jda.api.exceptions.InsufficientPermissionException;
import net.dv8tion.jda.api.exceptions.PermissionException;
import net.dv8tion.jda.api.requests.RestAction;
import net.dv8tion.jda.api.requests.restaction.pagination.ReactionPaginationAction;
import net.dv8tion.jda.internal.requests.RestActionImpl;
import net.dv8tion.jda.internal.requests.Route;
import net.dv8tion.jda.internal.requests.restaction.pagination.ReactionPaginationActionImpl;
import net.dv8tion.jda.internal.utils.Checks;
import net.dv8tion.jda.internal.utils.EncodingUtil;
import javax.annotation.CheckReturnValue;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import java.util.Objects;
/**
* An object representing a single MessageReaction from Discord.
* This is an immutable object and is not updated by method calls or changes in Discord. A new snapshot instance
* built from Discord is needed to see changes.
*
* @since 3.0
*
* @see Message#getReactions()
* @see Message#getReactionByUnicode(String)
* @see Message#getReactionById(long)
*/
public class MessageReaction
{
private final MessageChannel channel;
private final ReactionEmote emote;
private final long messageId;
private final boolean self;
private final int count;
/**
* Creates a new MessageReaction instance
*
* @param channel
* The {@link net.dv8tion.jda.api.entities.MessageChannel} this Reaction was used in
* @param emote
* The {@link net.dv8tion.jda.api.entities.MessageReaction.ReactionEmote ReactionEmote} that was used
* @param messageId
* The message id this reaction is attached to
* @param self
* Whether we already reacted with this Reaction
* @param count
* The amount of people that reacted with this Reaction
*/
public MessageReaction(@Nonnull MessageChannel channel, @Nonnull ReactionEmote emote, long messageId, boolean self, int count)
{
this.channel = channel;
this.emote = emote;
this.messageId = messageId;
this.self = self;
this.count = count;
}
/**
* The JDA instance of this Reaction
*
* @return The JDA instance of this Reaction
*/
@Nonnull
public JDA getJDA()
{
return channel.getJDA();
}
/**
* Whether the currently logged in account has reacted with this reaction
*
* @return True, if we reacted with this reaction
*/
public boolean isSelf()
{
return self;
}
/**
* Whether this reaction can provide a count via {@link #getCount()}.
* <br>This is usually not provided for reactions coming from {@link net.dv8tion.jda.api.events.message.react.MessageReactionAddEvent}
* or similar.
*
* @return True, if a count is available
*
* @see #getCount()
*/
public boolean hasCount()
{
return count >= 0;
}
/**
* The amount of users that already reacted with this Reaction
* <br><b>This is not updated, it is a {@code final int} per Reaction instance</b>
*
* <p>This value is not available in events such as {@link net.dv8tion.jda.api.events.message.react.MessageReactionAddEvent MessageReactionAddEvent}
* and {@link net.dv8tion.jda.api.events.message.react.MessageReactionRemoveEvent MessageReactionRemoveEvent} in which case an
* {@link java.lang.IllegalStateException IllegalStateException} is thrown!
*
* @throws java.lang.IllegalStateException
* If this MessageReaction is from an event which does not provide a count
*
* @return The amount of users that reacted with this Reaction
*/
public int getCount()
{
if (!hasCount())
throw new IllegalStateException("Cannot retrieve count for this MessageReaction!");
return count;
}
/**
* The {@link net.dv8tion.jda.api.entities.ChannelType ChannelType}
* this Reaction was used in.
*
* @return The ChannelType
*/
@Nonnull
public ChannelType getChannelType()
{
return channel.getType();
}
/**
* Whether this Reaction was used in a {@link net.dv8tion.jda.api.entities.MessageChannel MessageChannel}
* of the specified {@link net.dv8tion.jda.api.entities.ChannelType ChannelType}.
*
* @param type
* The ChannelType to compare
*
* @return True, if this Reaction was used in a MessageChannel from the specified ChannelType
*/
public boolean isFromType(@Nonnull ChannelType type)
{
return getChannelType() == type;
}
/**
* The {@link net.dv8tion.jda.api.entities.Guild Guild} this Reaction was used in,
* this might return {@code null} when this Reaction was not used in a MessageChannel
* from the ChannelType {@link net.dv8tion.jda.api.entities.ChannelType#TEXT TEXT}!
*
* @return {@link net.dv8tion.jda.api.entities.Guild Guild} this Reaction was used in, or {@code null}
*/
@Nullable
public Guild getGuild()
{
TextChannel channel = getTextChannel();
return channel != null ? channel.getGuild() : null;
}
/**
* The {@link net.dv8tion.jda.api.entities.TextChannel TextChannel} this Reaction was used in
* or {@code null} if this is not from type {@link net.dv8tion.jda.api.entities.ChannelType#TEXT ChannelType.TEXT}!
*
* @return The {@link net.dv8tion.jda.api.entities.TextChannel TextChannel} or {@code null}
*/
@Nullable
public TextChannel getTextChannel()
{
return getChannel() instanceof TextChannel ? (TextChannel) getChannel() : null;
}
/**
* The {@link net.dv8tion.jda.api.entities.PrivateChannel PrivateChannel} this Reaction was used in
* or {@code null} if this is not from type {@link net.dv8tion.jda.api.entities.ChannelType#PRIVATE ChannelType.PRIVATE}!
*
* @return The {@link net.dv8tion.jda.api.entities.PrivateChannel PrivateChannel} or {@code null}
*/
@Nullable
public PrivateChannel getPrivateChannel()
{
return getChannel() instanceof PrivateChannel ? (PrivateChannel) getChannel() : null;
}
/**
* The {@link net.dv8tion.jda.api.entities.MessageChannel MessageChannel}
* this Reaction was used in.
*
* @return The channel this Reaction was used in
*/
@Nonnull
public MessageChannel getChannel()
{
return channel;
}
/**
* The {@link net.dv8tion.jda.api.entities.MessageReaction.ReactionEmote ReactionEmote}
* of this Reaction
*
* @return The final instance of this Reaction's Emote/Emoji
*/
@Nonnull
public ReactionEmote getReactionEmote()
{
return emote;
}
/**
* The message id this reaction is attached to
*
* @return The message id this reaction is attached to
*/
@Nonnull
public String getMessageId()
{
return Long.toUnsignedString(messageId);
}
/**
* The message id this reaction is attached to
*
* @return The message id this reaction is attached to
*/
public long getMessageIdLong()
{
return messageId;
}
/**
* Retrieves the {@link net.dv8tion.jda.api.entities.User Users} that
* already reacted with this MessageReaction.
*
* <p>Possible ErrorResponses include:
* <ul>
* <li>{@link net.dv8tion.jda.api.requests.ErrorResponse#UNKNOWN_MESSAGE UNKNOWN_MESSAGE}
* <br>If the message this reaction was attached to got deleted.</li>
*
* <li>{@link net.dv8tion.jda.api.requests.ErrorResponse#UNKNOWN_CHANNEL UNKNOWN_CHANNEL}
* <br>If the channel this reaction was used in got deleted.</li>
*
* <li>{@link net.dv8tion.jda.api.requests.ErrorResponse#MISSING_ACCESS MISSING_ACCESS}
* <br>If we were removed from the channel/guild</li>
* </ul>
*
* @return {@link ReactionPaginationAction ReactionPaginationAction}
*/
@Nonnull
@CheckReturnValue
public ReactionPaginationAction retrieveUsers()
{
return new ReactionPaginationActionImpl(this);
}
/**
* Removes this Reaction from the Message.
* <br>This will remove our own reaction as an overload
* of {@link #removeReaction(User)}.
*
* <p>Possible ErrorResponses include:
* <ul>
* <li>{@link net.dv8tion.jda.api.requests.ErrorResponse#UNKNOWN_MESSAGE UNKNOWN_MESSAGE}
* <br>If the message this reaction was attached to got deleted.</li>
*
* <li>{@link net.dv8tion.jda.api.requests.ErrorResponse#UNKNOWN_CHANNEL UNKNOWN_CHANNEL}
* <br>If the channel this reaction was used in got deleted.</li>
*
* <li>{@link net.dv8tion.jda.api.requests.ErrorResponse#MISSING_ACCESS MISSING_ACCESS}
* <br>If we were removed from the channel/guild</li>
* </ul>
*
* @return {@link net.dv8tion.jda.api.requests.RestAction RestAction} - Type: Void
* Nothing is returned on success
*/
@Nonnull
@CheckReturnValue
public RestAction<Void> removeReaction()
{
return removeReaction(getJDA().getSelfUser());
}
/**
* Removes this Reaction from the Message.
* <br>This will remove the reaction of the {@link net.dv8tion.jda.api.entities.User User}
* provided.
*
* <p>If the provided User did not react with this Reaction this does nothing.
*
* <p>Possible ErrorResponses include:
* <ul>
* <li>{@link net.dv8tion.jda.api.requests.ErrorResponse#UNKNOWN_MESSAGE UNKNOWN_MESSAGE}
* <br>If the message this reaction was attached to got deleted.</li>
*
* <li>{@link net.dv8tion.jda.api.requests.ErrorResponse#UNKNOWN_CHANNEL UNKNOWN_CHANNEL}
* <br>If the channel this reaction was used in got deleted.</li>
*
* <li>{@link net.dv8tion.jda.api.requests.ErrorResponse#MISSING_ACCESS MISSING_ACCESS}
* <br>If we were removed from the channel/guild</li>
* </ul>
*
* @param user
* The User of which to remove the reaction
*
* @throws java.lang.IllegalArgumentException
* If the provided {@code user} is null.
* @throws net.dv8tion.jda.api.exceptions.InsufficientPermissionException
* If the provided User is not us and we do not have permission to
* {@link net.dv8tion.jda.api.Permission#MESSAGE_MANAGE manage messages}
* in the channel this reaction was used in
* @throws net.dv8tion.jda.api.exceptions.PermissionException
* If the message is from another user in a {@link net.dv8tion.jda.api.entities.PrivateChannel PrivateChannel}
*
* @return {@link net.dv8tion.jda.api.requests.RestAction RestAction}
* Nothing is returned on success
*/
@Nonnull
@CheckReturnValue
public RestAction<Void> removeReaction(@Nonnull User user)
{
Checks.notNull(user, "User");
boolean self = user.equals(getJDA().getSelfUser());
if (!self)
{
if (channel.getType() == ChannelType.TEXT)
{
GuildChannel channel = (GuildChannel) this.channel;
if (!channel.getGuild().getSelfMember().hasPermission(channel, Permission.MESSAGE_MANAGE))
throw new InsufficientPermissionException(channel, Permission.MESSAGE_MANAGE);
}
else
{
throw new PermissionException("Unable to remove Reaction of other user in non-text channel!");
}
}
String code = emote.isEmote()
? emote.getName() + ":" + emote.getId()
: EncodingUtil.encodeUTF8(emote.getName());
String target = self ? "@me" : user.getId();
Route.CompiledRoute route = Route.Messages.REMOVE_REACTION.compile(channel.getId(), getMessageId(), code, target);
return new RestActionImpl<>(getJDA(), route);
}
@Override
public boolean equals(Object obj)
{
if (obj == this)
return true;
if (!(obj instanceof MessageReaction))
return false;
MessageReaction r = (MessageReaction) obj;
return r.emote.equals(emote)
&& r.self == self
&& r.messageId == messageId;
}
@Override
public String toString()
{
return "MR:(M:(" + messageId + ") / " + emote + ")";
}
/**
* Represents an Emoji/Emote of a MessageReaction
* <br>This is used to wrap both emojis and emotes
*/
public static class ReactionEmote implements ISnowflake
{
private final JDA api;
private final String name;
private final long id;
private final Emote emote;
private ReactionEmote(@Nonnull String name, @Nonnull JDA api)
{
this.name = name;
this.api = api;
this.id = 0;
this.emote = null;
}
private ReactionEmote(@Nonnull Emote emote)
{
this.api = emote.getJDA();
this.name = emote.getName();
this.id = emote.getIdLong();
this.emote = emote;
}
@Nonnull
public static ReactionEmote fromUnicode(@Nonnull String name, @Nonnull JDA api)
{
return new ReactionEmote(name, api);
}
@Nonnull
public static ReactionEmote fromCustom(@Nonnull Emote emote)
{
return new ReactionEmote(emote);
}
/**
* Whether this is an {@link net.dv8tion.jda.api.entities.Emote Emote} wrapper.
* <br>This means {@link #getEmoji()} will throw {@link java.lang.IllegalStateException}.
*
* @return True, if {@link #getEmote()} can be used
*
* @see #getEmote()
*/
public boolean isEmote()
{
return emote != null;
}
/**
* Whether this represents a unicode emoji.
* <br>This means {@link #getEmote()}, {@link #getId()}, and {@link #getIdLong()} will not be available.
*
* @return True, if this represents a unicode emoji
*
* @see #getEmoji()
*/
public boolean isEmoji()
{
return emote == null;
}
/**
* The name for this emote/emoji
* <br>For unicode emojis this will be the unicode of said emoji rather than an alias like {@code :smiley:}.
*
* <p>For better use in consoles that do not support unicode emoji use {@link #getAsCodepoints()} for a more
* readable representation of the emoji.
*
* <p>Custom emotes may return an empty string for this if the emote was deleted.
*
* @return The name for this emote/emoji
*/
@Nonnull
public String getName()
{
return name;
}
/**
* Converts the unicode name into codepoint notation like {@code U+1F602}.
*
* @throws java.lang.IllegalStateException
* If this is not an emoji reaction, see {@link #isEmoji()}
*
* @return String containing the codepoint representation of the reaction emoji
*/
@Nonnull
public String getAsCodepoints()
{
if (!isEmoji())
throw new IllegalStateException("Cannot get codepoint for custom emote reaction");
return EncodingUtil.encodeCodepoints(name);
}
@Override
public long getIdLong()
{
if (!isEmote())
throw new IllegalStateException("Cannot get id for emoji reaction");
return id;
}
/**
* The unicode representing the emoji used for reacting.
*
* @throws java.lang.IllegalStateException
* If this is not an emoji reaction, see {@link #isEmoji()}
*
* @return The unicode for the emoji
*/
@Nonnull
public String getEmoji()
{
if (!isEmoji())
throw new IllegalStateException("Cannot get emoji code for custom emote reaction");
return getName();
}
/**
* The instance of {@link net.dv8tion.jda.api.entities.Emote Emote}
* for the Reaction instance.
*
* @throws java.lang.IllegalStateException
* If this is not a custom emote reaction, see {@link #isEmote()}
*
* @return The Emote for the Reaction instance
*/
@Nonnull
public Emote getEmote()
{
if (!isEmote())
throw new IllegalStateException("Cannot get custom emote for emoji reaction");
return emote;
}
/**
* The current JDA instance for the Reaction
*
* @return The JDA instance of the Reaction
*/
@Nonnull
public JDA getJDA()
{
return api;
}
@Override
public boolean equals(Object obj)
{
return obj instanceof ReactionEmote
&& Objects.equals(((ReactionEmote) obj).id, id)
&& ((ReactionEmote) obj).getName().equals(name);
}
@Override
public String toString()
{
if (isEmoji())
return "RE:" + getAsCodepoints();
return "RE:" + getName() + "(" + getId() + ")";
}
}
}