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path: root/nms-patches/SpawnerCreature.patch
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--- a/net/minecraft/server/SpawnerCreature.java
+++ b/net/minecraft/server/SpawnerCreature.java
@@ -6,10 +6,16 @@
 import java.util.Random;
 import java.util.Set;
 
+// CraftBukkit start
+import org.bukkit.craftbukkit.util.LongHash;
+import org.bukkit.craftbukkit.util.LongHashSet;
+import org.bukkit.event.entity.CreatureSpawnEvent.SpawnReason;
+// CraftBukkit end
+
 public final class SpawnerCreature {
 
     private static final int a = (int) Math.pow(17.0D, 2.0D);
-    private final Set<ChunkCoordIntPair> b = Sets.newHashSet();
+    private final LongHashSet b = new LongHashSet(); // CraftBukkit
 
     public SpawnerCreature() {}
 
@@ -36,14 +42,17 @@
                     for (int i1 = -b0; i1 <= b0; ++i1) {
                         for (k = -b0; k <= b0; ++k) {
                             boolean flag3 = i1 == -b0 || i1 == b0 || k == -b0 || k == b0;
-                            ChunkCoordIntPair chunkcoordintpair = new ChunkCoordIntPair(i1 + l, k + j);
+                            // CraftBukkit start - use LongHash and LongHashSet
+                            // ChunkCoordIntPair chunkcoordintpair = new ChunkCoordIntPair(i1 + l, k + j);
 
-                            if (!this.b.contains(chunkcoordintpair)) {
+                            long chunkCoords = LongHash.toLong(i1 + l, k + j);
+                            if (!this.b.contains(chunkCoords)) {
                                 ++i;
-                                if (!flag3 && worldserver.getWorldBorder().isInBounds(chunkcoordintpair)) {
-                                    this.b.add(chunkcoordintpair);
+                                if (!flag3 && worldserver.getWorldBorder().isInBounds(i1 + l, k + j)) {
+                                    this.b.add(chunkCoords);
                                 }
                             }
+                            // CraftBukkit end
                         }
                     }
                 }
@@ -58,17 +67,41 @@
             for (int k1 = 0; k1 < j; ++k1) {
                 EnumCreatureType enumcreaturetype = aenumcreaturetype[k1];
 
+               // CraftBukkit start - Use per-world spawn limits
+                int limit = enumcreaturetype.b();
+                switch (enumcreaturetype) {
+                    case MONSTER:
+                        limit = worldserver.getWorld().getMonsterSpawnLimit();
+                        break;
+                    case CREATURE:
+                        limit = worldserver.getWorld().getAnimalSpawnLimit();
+                        break;
+                    case WATER_CREATURE:
+                        limit = worldserver.getWorld().getWaterAnimalSpawnLimit();
+                        break;
+                    case AMBIENT:
+                        limit = worldserver.getWorld().getAmbientSpawnLimit();
+                        break;
+                }
+
+                if (limit == 0) {
+                    continue;
+                }
+                // CraftBukkit end
+
                 if ((!enumcreaturetype.d() || flag1) && (enumcreaturetype.d() || flag) && (!enumcreaturetype.e() || flag2)) {
                     k = worldserver.a(enumcreaturetype.a());
-                    int l1 = enumcreaturetype.b() * i / SpawnerCreature.a;
+                    int l1 = limit * i / a; // CraftBukkit - use per-world limits
 
                     if (k <= l1) {
                         Iterator iterator1 = this.b.iterator();
 
                         label115:
                         while (iterator1.hasNext()) {
-                            ChunkCoordIntPair chunkcoordintpair1 = (ChunkCoordIntPair) iterator1.next();
-                            BlockPosition blockposition1 = getRandomPosition(worldserver, chunkcoordintpair1.x, chunkcoordintpair1.z);
+                            // CraftBukkit start = use LongHash and LongObjectHashMap
+                            long key = ((Long) iterator1.next()).longValue();
+                            BlockPosition blockposition1 = getRandomPosition(worldserver, LongHash.msw(key), LongHash.lsw(key));
+                            // CraftBukkit
                             int i2 = blockposition1.getX();
                             int j2 = blockposition1.getY();
                             int k2 = blockposition1.getZ();
@@ -120,7 +153,7 @@
                                                             groupdataentity = entityinsentient.prepare(worldserver.E(new BlockPosition(entityinsentient)), groupdataentity);
                                                             if (entityinsentient.canSpawn()) {
                                                                 ++l2;
-                                                                worldserver.addEntity(entityinsentient);
+                                                                worldserver.addEntity(entityinsentient, SpawnReason.NATURAL); // CraftBukkit - Added a reason for spawning this creature
                                                             }
 
                                                             if (l2 >= entityinsentient.bV()) {
@@ -214,8 +247,10 @@
                             }
 
                             entityinsentient.setPositionRotation((double) ((float) j1 + 0.5F), (double) blockposition.getY(), (double) ((float) k1 + 0.5F), random.nextFloat() * 360.0F, 0.0F);
-                            world.addEntity(entityinsentient);
+                            // CraftBukkit start - Added a reason for spawning this creature, moved entityinsentient.prepare(groupdataentity) up
                             groupdataentity = entityinsentient.prepare(world.E(new BlockPosition(entityinsentient)), groupdataentity);
+                            world.addEntity(entityinsentient, SpawnReason.CHUNK_GEN);
+                            // CraftBukkit end
                             flag = true;
                         }