SPIGOT-2304: Implement LootGenerateEvent

By: Parker Hawke <hawkeboyz2@hotmail.com>

paper-server/nms-patches/LootTableRegistry.patch

@@ -0,0 +1,31 @@
+--- a/net/minecraft/server/LootTableRegistry.java
++++ b/net/minecraft/server/LootTableRegistry.java
+@@ -17,6 +17,7 @@
+     private static final Logger LOGGER = LogManager.getLogger();
+     private static final Gson b = (new GsonBuilder()).registerTypeAdapter(LootValueBounds.class, new LootValueBounds.a()).registerTypeAdapter(LootValueBinomial.class, new LootValueBinomial.a()).registerTypeAdapter(LootValueConstant.class, new LootValueConstant.a()).registerTypeAdapter(LootIntegerLimit.class, new LootIntegerLimit.a()).registerTypeAdapter(LootSelector.class, new LootSelector.b()).registerTypeAdapter(LootTable.class, new LootTable.b()).registerTypeHierarchyAdapter(LootEntryAbstract.class, new LootEntries.a()).registerTypeHierarchyAdapter(LootItemFunction.class, new LootItemFunctions.a()).registerTypeHierarchyAdapter(LootItemCondition.class, new LootItemConditions.a()).registerTypeHierarchyAdapter(LootTableInfo.EntityTarget.class, new LootTableInfo.EntityTarget.a()).create();
+     private Map<MinecraftKey, LootTable> c = ImmutableMap.of();
++    public Map<LootTable, MinecraftKey> lootTableToKey = ImmutableMap.of(); // CraftBukkit
+     private final LootPredicateManager d;
+ 
+     public LootTableRegistry(LootPredicateManager lootpredicatemanager) {
+@@ -52,7 +53,7 @@
+         LootPredicateManager lootpredicatemanager = this.d;
+ 
+         this.d.getClass();
+-        Function function = lootpredicatemanager::a;
++        Function<MinecraftKey, LootItemCondition> function = lootpredicatemanager::a; // CraftBukkit - decompile error
+ 
+         immutablemap.getClass();
+         LootCollector lootcollector = new LootCollector(lootcontextparameterset, function, immutablemap::get);
+@@ -64,6 +65,11 @@
+             LootTableRegistry.LOGGER.warn("Found validation problem in " + s + ": " + s1);
+         });
+         this.c = immutablemap;
++        // CraftBukkit start - build a reversed registry map
++        ImmutableMap.Builder<LootTable, MinecraftKey> lootTableToKeyBuilder = ImmutableMap.builder();
++        this.c.forEach((lootTable, key) -> lootTableToKeyBuilder.put(key, lootTable)); // PAIL rename keyToLootTable
++        this.lootTableToKey = lootTableToKeyBuilder.build();
++        // CraftBukkit end
+     }
+ 
+     public static void a(LootCollector lootcollector, MinecraftKey minecraftkey, LootTable loottable) {