Paper/Spigot-Server-Patches/0123-Add-ProjectileCollideEvent.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Techcable <Techcable@outlook.com>
Date: Fri, 16 Dec 2016 21:25:39 -0600
Subject: [PATCH] Add ProjectileCollideEvent


diff --git a/src/main/java/net/minecraft/server/EntityArrow.java b/src/main/java/net/minecraft/server/EntityArrow.java
index 2a86d4b8af5e436e82e003f50c1929702af700c4..93084633d487684fb598038d148670fe6a00b3ed 100644
--- a/src/main/java/net/minecraft/server/EntityArrow.java
+++ b/src/main/java/net/minecraft/server/EntityArrow.java
@@ -160,6 +160,17 @@ public abstract class EntityArrow extends IProjectile {
                     }
                 }
 
+                // Paper start - Call ProjectileCollideEvent
+                // TODO: flag - noclip - call cancelled?
+                if (object instanceof MovingObjectPositionEntity) {
+                    com.destroystokyo.paper.event.entity.ProjectileCollideEvent event = org.bukkit.craftbukkit.event.CraftEventFactory.callProjectileCollideEvent(this, (MovingObjectPositionEntity)object);
+                    if (event.isCancelled()) {
+                        object = null;
+                        movingobjectpositionentity = null;
+                    }
+                }
+                // Paper end
+
                 if (object != null && !flag) {
                     this.a((MovingObjectPosition) object);
                     this.impulse = true;
diff --git a/src/main/java/net/minecraft/server/EntityFireball.java b/src/main/java/net/minecraft/server/EntityFireball.java
index 1ee09cb383d762219bda89463f4b6af807799385..74ca38f8e4e1addc243c3f3b57021d26f0ce3c97 100644
--- a/src/main/java/net/minecraft/server/EntityFireball.java
+++ b/src/main/java/net/minecraft/server/EntityFireball.java
@@ -57,7 +57,16 @@ public abstract class EntityFireball extends IProjectile {
 
             MovingObjectPosition movingobjectposition = ProjectileHelper.a((Entity) this, this::a);
 
-            if (movingobjectposition.getType() != MovingObjectPosition.EnumMovingObjectType.MISS) {
+            // Paper start - Call ProjectileCollideEvent
+            if (movingobjectposition instanceof MovingObjectPositionEntity) {
+                com.destroystokyo.paper.event.entity.ProjectileCollideEvent event = CraftEventFactory.callProjectileCollideEvent(this, (MovingObjectPositionEntity)movingobjectposition);
+                if (event.isCancelled()) {
+                    movingobjectposition = null;
+                }
+            }
+            // Paper end
+
+            if (movingobjectposition != null && movingobjectposition.getType() != MovingObjectPosition.EnumMovingObjectType.MISS) { // Paper - add null check in case cancelled
                 this.a(movingobjectposition);
 
                 // CraftBukkit start - Fire ProjectileHitEvent
diff --git a/src/main/java/net/minecraft/server/EntityProjectile.java b/src/main/java/net/minecraft/server/EntityProjectile.java
index 7391fd31148dbde60e34955841a296f454ac768e..53a8ea7d1eff84abe6c49464d556aa2788a6abcb 100644
--- a/src/main/java/net/minecraft/server/EntityProjectile.java
+++ b/src/main/java/net/minecraft/server/EntityProjectile.java
@@ -41,7 +41,17 @@ public abstract class EntityProjectile extends IProjectile {
         }
 
         if (movingobjectposition.getType() != MovingObjectPosition.EnumMovingObjectType.MISS && !flag) {
+            // Paper start - Call ProjectileCollideEvent
+            if (movingobjectposition instanceof MovingObjectPositionEntity) {
+                com.destroystokyo.paper.event.entity.ProjectileCollideEvent event = org.bukkit.craftbukkit.event.CraftEventFactory.callProjectileCollideEvent(this, (MovingObjectPositionEntity)movingobjectposition);
+                if (event.isCancelled()) {
+                    movingobjectposition = null;
+                }
+            }
+            if (movingobjectposition != null) {
+            // Paper end
             this.a(movingobjectposition);
+            } // Paper
         }
 
         this.checkBlockCollisions();
diff --git a/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java b/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
index 5f6255ceeede4e4ba3e6e8993b6aad6311f50462..1db30da4294f1187eeacecfc056a44963378a1cc 100644
--- a/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
+++ b/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
@@ -1186,6 +1186,16 @@ public class CraftEventFactory {
         return CraftItemStack.asNMSCopy(bitem);
     }
 
+    // Paper start
+    public static com.destroystokyo.paper.event.entity.ProjectileCollideEvent callProjectileCollideEvent(Entity entity, MovingObjectPositionEntity position) {
+        Projectile projectile = (Projectile) entity.getBukkitEntity();
+        org.bukkit.entity.Entity collided = position.getEntity().getBukkitEntity();
+        com.destroystokyo.paper.event.entity.ProjectileCollideEvent event = new com.destroystokyo.paper.event.entity.ProjectileCollideEvent(projectile, collided);
+        Bukkit.getPluginManager().callEvent(event);
+        return event;
+    }
+    // Paper end
+
     public static ProjectileLaunchEvent callProjectileLaunchEvent(Entity entity) {
         Projectile bukkitEntity = (Projectile) entity.getBukkitEntity();
         ProjectileLaunchEvent event = new ProjectileLaunchEvent(bukkitEntity);