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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 e06aa636bf4e18ca2810e0626f427839cd2bce88..bc51c6d8b39907d89a4f65cd7a8266df1fceab8c 100644
--- a/src/main/java/net/minecraft/world/entity/LivingEntity.java
+++ b/src/main/java/net/minecraft/world/entity/LivingEntity.java
@@ -3283,8 +3283,10 @@ 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 3d947293d33407e5d24f8fba738ab872e1d890b6..48df7de02e0765bfe62ae1b8a4c0029743430221 100644
--- a/src/main/java/net/minecraft/world/entity/animal/Panda.java
+++ b/src/main/java/net/minecraft/world/entity/animal/Panda.java
@@ -527,7 +527,9 @@ 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 aba20a4352d8983b01ab5d329187588f68d3e405..aac60e85cd6dba7d87f4a1663c2c62952521d112 100644
--- a/src/main/java/net/minecraft/world/entity/monster/Ravager.java
+++ b/src/main/java/net/minecraft/world/entity/monster/Ravager.java
@@ -167,7 +167,9 @@ 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 fc7b54892af62e8b6e1cc93f2937e05bbfd01c8c..eed8322f534a9556dbb99c4c32b135dfc3dd8b0f 100644
--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftLivingEntity.java
+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftLivingEntity.java
@@ -909,5 +909,19 @@ public class CraftLivingEntity extends CraftEntity implements LivingEntity {
     public org.bukkit.inventory.EquipmentSlot getHandRaised() {
         return getHandle().getUsedItemHand() == net.minecraft.world.InteractionHand.MAIN_HAND ? org.bukkit.inventory.EquipmentSlot.HAND : org.bukkit.inventory.EquipmentSlot.OFF_HAND;
     }
+
+    @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
 }