Support Multiverse-Core 5 in the world alias provider

bukkit/build.gradle

@@ -44,6 +44,7 @@ dependencies {
     implementation project(":bukkit:simpleclans")
     implementation project(":bukkit:playerpoints")
     implementation project(":bukkit:multiverse")
+    implementation project(":bukkit:multiverse5")
     implementation project(":bukkit:factionsuuid")
     implementation project(":bukkit:factionsuuid05")
     implementation project(":bukkit:factions")

bukkit/multiverse5/build.gradle

@@ -0,0 +1,39 @@
+/*
+ * Copyright (C) 2016 Florian Stober
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+repositories {
+    maven {
+        url "https://repo.onarandombox.com/content/groups/public/"
+    }
+}
+
+// Multiverse-Core 5 is compiled for Java 17, so javac 8 cannot read it. Compile this module with
+// a Java 17 toolchain but emit Java 8 bytecode, so the rest of the project - which is Java 8
+// throughout - can still depend on it directly, and the produced classes load on any server.
+java {
+    toolchain {
+        languageVersion.set(JavaLanguageVersion.of(17))
+    }
+}
+
+tasks.withType(JavaCompile).configureEach {
+    options.release.set(8)
+}
+
+dependencies {
+    compileOnly "org.mvplugins.multiverse.core:multiverse-core:5.0.0"
+}

bukkit/multiverse5/src/main/java/de/codecrafter47/data/bukkit/multiverse/MultiverseWorldAliasProvider5.java

@@ -0,0 +1,44 @@
+/*
+ *     Copyright (C) 2020 Florian Stober
+ *
+ *     This program is free software: you can redistribute it and/or modify
+ *     it under the terms of the GNU General Public License as published by
+ *     the Free Software Foundation, either version 3 of the License, or
+ *     (at your option) any later version.
+ *
+ *     This program is distributed in the hope that it will be useful,
+ *     but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ *     GNU General Public License for more details.
+ *
+ *     You should have received a copy of the GNU General Public License
+ *     along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package de.codecrafter47.data.bukkit.multiverse;
+
+import org.bukkit.entity.Player;
+import org.mvplugins.multiverse.core.MultiverseCoreApi;
+import org.mvplugins.multiverse.core.world.MultiverseWorld;
+import org.mvplugins.multiverse.external.vavr.control.Option;
+
+import java.util.function.Function;
+
+/**
+ * World alias lookup for Multiverse-Core 5.x.
+ *
+ * <p>Multiverse 5 renamed its packages from {@code com.onarandombox.MultiverseCore} to
+ * {@code org.mvplugins.multiverse.core}, so {@code MultiverseWorldAliasProvider} - which targets
+ * the 4.x API - fails with {@code NoClassDefFoundError} on a Multiverse 5 server.
+ *
+ * <p>Uses {@code getAliasOrName()} rather than {@code getAlias()} so a world without an alias
+ * yields its name instead of an empty string.
+ */
+public class MultiverseWorldAliasProvider5 implements Function<Player, String> {
+
+    @Override
+    public String apply(Player player) {
+        Option<MultiverseWorld> world = MultiverseCoreApi.get().getWorldManager().getWorld(player.getWorld());
+        return world.isDefined() ? world.get().getAliasOrName() : null;
+    }
+}

bukkit/src/main/java/de/codecrafter47/data/bukkit/PlayerDataAccess.java

@@ -33,6 +33,7 @@
 import de.codecrafter47.data.bukkit.factions.*;
 import de.codecrafter47.data.bukkit.factionsuuid.*;
 import de.codecrafter47.data.bukkit.multiverse.MultiverseWorldAliasProvider;
+import de.codecrafter47.data.bukkit.multiverse.MultiverseWorldAliasProvider5;
 import de.codecrafter47.data.bukkit.playerpoints.PlayerPointsProvider;
 import de.codecrafter47.data.bukkit.simpleclans.*;
 import de.codecrafter47.data.bukkit.supervanish.SuperVanishIsVanishedProvider;
@@ -171,7 +172,11 @@ protected void init() {
         }
 
         if (Bukkit.getPluginManager().getPlugin("Multiverse-Core") != null) {
-            addProvider(BukkitData.Multiverse_WorldAlias, new MultiverseWorldAliasProvider());
+            if (classExists("org.mvplugins.multiverse.core.MultiverseCoreApi")) {
+                addProvider(BukkitData.Multiverse_WorldAlias, new MultiverseWorldAliasProvider5());
+            } else {
+                addProvider(BukkitData.Multiverse_WorldAlias, new MultiverseWorldAliasProvider());
+            }
         }
 
         if (Bukkit.getPluginManager().getPlugin("ASkyBlock") != null) {

settings.gradle

@@ -27,6 +27,7 @@ include 'bukkit:supervanish'
 include 'bukkit:simpleclans'
 include 'bukkit:playerpoints'
 include 'bukkit:multiverse'
+include 'bukkit:multiverse5'
 include 'bukkit:factionsuuid'
 include 'bukkit:factionsuuid05'
 include 'bukkit:factions'