Add common interface for interactions with a custom ID

src/main/java/net/dv8tion/jda/api/interactions/ICustomIdInteraction.java

@@ -0,0 +1,44 @@
+/*
+ * Copyright 2015 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.interactions;
+
+import net.dv8tion.jda.api.interactions.components.ComponentInteraction;
+import net.dv8tion.jda.api.interactions.modals.ModalInteraction;
+
+import javax.annotation.Nonnull;
+
+/**
+ * Marker interface for interactions with custom IDs.
+ *
+ * <p>This includes modals and components.
+ */
+public interface ICustomIdInteraction
+{
+    /**
+     * The relevant custom ID, that has been provided for the component or modal when it was originally created.
+     * <br>This value should be used to determine what action to take in regard to this interaction.
+     *
+     * <br>This id does not have to be numerical.
+     *
+     * @return The custom ID
+     *
+     * @see ComponentInteraction#getComponentId()
+     * @see ModalInteraction#getModalId()
+     */
+    @Nonnull
+    String getCustomId();
+}

src/main/java/net/dv8tion/jda/api/interactions/components/ComponentInteraction.java

@@ -19,6 +19,7 @@
 import net.dv8tion.jda.api.entities.Message;
 import net.dv8tion.jda.api.entities.channel.unions.GuildMessageChannelUnion;
 import net.dv8tion.jda.api.entities.channel.unions.MessageChannelUnion;
+import net.dv8tion.jda.api.interactions.ICustomIdInteraction;
 import net.dv8tion.jda.api.interactions.callbacks.IMessageEditCallback;
 import net.dv8tion.jda.api.interactions.callbacks.IModalCallback;
 import net.dv8tion.jda.api.interactions.callbacks.IPremiumRequiredReplyCallback;
@@ -32,8 +33,16 @@
  * <p>Instead of {@link #deferReply()} and {@link #reply(String)} you can use {@link #deferEdit()} and {@link #editMessage(String)} with these interactions!
  * <b>You can only acknowledge an interaction once!</b>
  */
-public interface ComponentInteraction extends IReplyCallback, IMessageEditCallback, IModalCallback, IPremiumRequiredReplyCallback
+public interface ComponentInteraction extends IReplyCallback, IMessageEditCallback, IModalCallback, IPremiumRequiredReplyCallback, ICustomIdInteraction
 {
+
+    @Override
+    @Nonnull
+    default String getCustomId()
+    {
+        return getComponentId();
+    }
+
     /**
      * The custom component ID provided to the component when it was originally created.
      * <br>This value should be used to determine what action to take in regard to this interaction.

src/main/java/net/dv8tion/jda/api/interactions/modals/ModalInteraction.java

@@ -19,6 +19,7 @@
 import net.dv8tion.jda.api.entities.Message;
 import net.dv8tion.jda.api.entities.channel.unions.GuildMessageChannelUnion;
 import net.dv8tion.jda.api.entities.channel.unions.MessageChannelUnion;
+import net.dv8tion.jda.api.interactions.ICustomIdInteraction;
 import net.dv8tion.jda.api.interactions.callbacks.IMessageEditCallback;
 import net.dv8tion.jda.api.interactions.callbacks.IReplyCallback;
 import net.dv8tion.jda.internal.utils.Checks;
@@ -36,8 +37,16 @@
  *
  * @see    net.dv8tion.jda.api.events.interaction.ModalInteractionEvent
  */
-public interface ModalInteraction extends IReplyCallback, IMessageEditCallback
+public interface ModalInteraction extends IReplyCallback, IMessageEditCallback, ICustomIdInteraction
 {
+
+    @Override
+    @Nonnull
+    default String getCustomId()
+    {
+        return getModalId();
+    }
+
     /**
      * Returns the custom id of the Modal in question
      *