Optimize map lookups with isEmpty check

leaf-server/minecraft-patches/features/0294-Optimize-map-lookups-with-isEmpty-check.patch

@@ -0,0 +1,41 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Github Actions <[email protected]>
+Date: Mon, 9 Feb 2026 12:37:26 +0300
+Subject: [PATCH] Optimize map lookups with isEmpty check
+
+
+diff --git a/net/minecraft/world/entity/Entity.java b/net/minecraft/world/entity/Entity.java
+index 8d092716cdcc48b829a1c0ee2e5416d648143a37..da36090b8bd290125ddedfd33e14857344e33a3c 100644
+--- a/net/minecraft/world/entity/Entity.java
++++ b/net/minecraft/world/entity/Entity.java
+@@ -4771,7 +4771,7 @@ public abstract class Entity implements SyncedDataHolder, DebugValueSource, Name
+     }
+
+     public boolean hasPassenger(Entity entity) {
+-        return this.passengers.contains(entity);
++        return !passengers.isEmpty() && this.passengers.contains(entity); // Leaf - Optimize map lookups with isEmpty check
+     }
+
+     public boolean hasPassenger(Predicate<Entity> predicate) {
+diff --git a/net/minecraft/world/entity/LivingEntity.java b/net/minecraft/world/entity/LivingEntity.java
+index 3b3a801e632bf65b9bef5833755b2de3be1b059a..bad7d25cb3cbefcee82fe1fe30a17c851083cfce 100644
+--- a/net/minecraft/world/entity/LivingEntity.java
++++ b/net/minecraft/world/entity/LivingEntity.java
+@@ -1175,7 +1175,7 @@ public abstract class LivingEntity extends Entity implements Attackable, Waypoin
+     }
+
+     public boolean hasEffect(Holder<MobEffect> effect) {
+-        return this.activeEffects.containsKey(effect);
++        return !activeEffects.isEmpty() && this.activeEffects.containsKey(effect); // Leaf - Optimize map lookups with isEmpty check
+     }
+
+     public @Nullable MobEffectInstance getEffect(Holder<MobEffect> effect) {
+@@ -4306,7 +4306,7 @@ public abstract class LivingEntity extends Entity implements Attackable, Waypoin
+     // CraftBukkit start - collidable API
+     @Override
+     public boolean canCollideWithBukkit(Entity entity) {
+-        return this.isPushable() && this.collides != this.collidableExemptions.contains(entity.getUUID());
++        return this.isPushable() && this.collides != (!this.collidableExemptions.isEmpty() && this.collidableExemptions.contains(entity.getUUID())); // Leaf - Optimize map lookups with isEmpty check
+     }
+     // CraftBukkit end
+