From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: BillyGalbreath <Blake.Galbreath@GMail.com>
Date: Sat, 8 Feb 2020 23:26:11 -0600
Subject: [PATCH] Entity Jump API

== AT ==
public net.minecraft.world.entity.LivingEntity jumping

diff --git a/src/main/java/net/minecraft/world/entity/LivingEntity.java b/src/main/java/net/minecraft/world/entity/LivingEntity.java
index f720d4d93ed13b1b9287a1ee7dc8bc4794834e1a..304a401fb1f378ff2cbfd888acf56a8516f79310 100644
--- a/src/main/java/net/minecraft/world/entity/LivingEntity.java
+++ b/src/main/java/net/minecraft/world/entity/LivingEntity.java
@@ -3539,8 +3539,10 @@ public abstract class LivingEntity extends Entity implements Attackable {
             } else if (this.isInLava() && (!this.onGround() || d3 > d4)) {
                 this.jumpInLiquid(FluidTags.LAVA);
             } else if ((this.onGround() || flag && d3 <= d4) && this.noJumpDelay == 0) {
+                if (new com.destroystokyo.paper.event.entity.EntityJumpEvent(getBukkitLivingEntity()).callEvent()) { // Paper - Entity Jump API
                 this.jumpFromGround();
                 this.noJumpDelay = 10;
+                } else { this.setJumping(false); } // Paper - Entity Jump API; setJumping(false) stops a potential loop
             }
         } else {
             this.noJumpDelay = 0;
diff --git a/src/main/java/net/minecraft/world/entity/animal/Panda.java b/src/main/java/net/minecraft/world/entity/animal/Panda.java
index 0b0887b7d2c69138617bee6ec3145f0a83b8734d..705c26ceff9371b09311bd7fa796c0efde7ebfee 100644
--- a/src/main/java/net/minecraft/world/entity/animal/Panda.java
+++ b/src/main/java/net/minecraft/world/entity/animal/Panda.java
@@ -530,7 +530,9 @@ public class Panda extends Animal {
             Panda entitypanda = (Panda) iterator.next();
 
             if (!entitypanda.isBaby() && entitypanda.onGround() && !entitypanda.isInWater() && entitypanda.canPerformAction()) {
+                if (new com.destroystokyo.paper.event.entity.EntityJumpEvent(getBukkitLivingEntity()).callEvent()) { // Paper - Entity Jump API
                 entitypanda.jumpFromGround();
+                } else { this.setJumping(false); } // Paper - Entity Jump API; setJumping(false) stops a potential loop
             }
         }
 
diff --git a/src/main/java/net/minecraft/world/entity/monster/Ravager.java b/src/main/java/net/minecraft/world/entity/monster/Ravager.java
index 32973d9c7bf4c4105d7bd82d3723e0b70cd79644..c661ae4e5c07494c7de852cc8d01f0f9839c1590 100644
--- a/src/main/java/net/minecraft/world/entity/monster/Ravager.java
+++ b/src/main/java/net/minecraft/world/entity/monster/Ravager.java
@@ -174,7 +174,9 @@ public class Ravager extends Raider {
                     }
 
                     if (!flag && this.onGround()) {
+                        if (new com.destroystokyo.paper.event.entity.EntityJumpEvent(getBukkitLivingEntity()).callEvent()) { // Paper - Entity Jump API
                         this.jumpFromGround();
+                        } else { this.setJumping(false); } // Paper - Entity Jump API; setJumping(false) stops a potential loop
                     }
                 }
             }
diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftLivingEntity.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftLivingEntity.java
index c4c83b4e17aac23794fdb51acfba4e7ef8451e2c..81034513faa3bd4f306430bc48532ba671a7b94b 100644
--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftLivingEntity.java
+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftLivingEntity.java
@@ -993,4 +993,20 @@ public class CraftLivingEntity extends CraftEntity implements LivingEntity {
         return org.bukkit.craftbukkit.CraftEquipmentSlot.getHand(this.getHandle().getUsedItemHand());
     }
     // Paper end - active item API
+
+    // Paper start - entity jump API
+    @Override
+    public boolean isJumping() {
+        return getHandle().jumping;
+    }
+
+    @Override
+    public void setJumping(boolean jumping) {
+        getHandle().setJumping(jumping);
+        if (jumping && getHandle() instanceof Mob) {
+            // this is needed to actually make a mob jump
+            ((Mob) getHandle()).getJumpControl().jump();
+        }
+    }
+    // Paper end - entity jump API
 }