Introduce BiGenericEvent

Author: aromaa

src/main/java/org/spongepowered/api/event/BiGenericEvent.java

@@ -0,0 +1,49 @@
+/*
+ * This file is part of SpongeAPI, licensed under the MIT License (MIT).
+ *
+ * Copyright (c) SpongePowered <https://www.spongepowered.org>
+ * Copyright (c) contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+package org.spongepowered.api.event;
+
+import io.leangen.geantyref.TypeToken;
+
+import java.util.List;
+
+/**
+ * {@link GenericEvent} that requires two type parameters.
+ *
+ * @param <T> The primary generic type
+ * @param <U> The secondary generic type
+ */
+public interface BiGenericEvent<T, U> extends GenericEvent<T> {
+
+    /**
+     * Gets the secondary {@link TypeToken generic type}.
+     *
+     * @return The type token
+     */
+    TypeToken<U> secondaryParamType();
+
+    default List<? extends TypeToken<?>> paramTypes() {
+        return List.of(this.paramType(), this.secondaryParamType());
+    }
+}

src/main/java/org/spongepowered/api/event/GenericEvent.java

@@ -26,6 +26,8 @@
 
 import io.leangen.geantyref.TypeToken;
 
+import java.util.List;
+
 /**
  * All {@link Event}s that require a generic type should implement this
  * interface.
@@ -40,4 +42,13 @@ public interface GenericEvent<T> extends Event {
      * @return The type token
      */
     TypeToken<T> paramType();
+
+    /**
+     * Gets all the {@link TypeToken generic type}'s.
+     *
+     * @return The list of type tokens
+     */
+    default List<? extends TypeToken<?>> paramTypes() {
+        return List.of(this.paramType());
+    }
 }