PaperMC/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/world/entity/projectile/EntityArrow.java b/src/main/java/net/minecraft/world/entity/projectile/EntityArrow.java
index 9bd4a283a99f86c9a26f73e0bad0c3414d66ad55..5ecbe9135a71dd84e0722fa9c039c272a11d206f 100644
--- a/src/main/java/net/minecraft/world/entity/projectile/EntityArrow.java
+++ b/src/main/java/net/minecraft/world/entity/projectile/EntityArrow.java
@@ -198,6 +198,17 @@ 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/world/entity/projectile/EntityFireball.java b/src/main/java/net/minecraft/world/entity/projectile/EntityFireball.java
index ed76aec99f46a7923d139e347779c24f512ac131..08b3499681eaf23a2f79f6dd9134ccfd86d888a4 100644
--- a/src/main/java/net/minecraft/world/entity/projectile/EntityFireball.java
+++ b/src/main/java/net/minecraft/world/entity/projectile/EntityFireball.java
@@ -72,7 +72,16 @@ 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/world/entity/projectile/EntityProjectile.java b/src/main/java/net/minecraft/world/entity/projectile/EntityProjectile.java
index 829b4f28896bcb0eb6e48242bd00585eeaae62c2..7bf41d2c924531f7a28e906c64b8a4ccd3dffedb 100644
--- a/src/main/java/net/minecraft/world/entity/projectile/EntityProjectile.java
+++ b/src/main/java/net/minecraft/world/entity/projectile/EntityProjectile.java
@@ -57,7 +57,17 @@ 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 52028387ae90b9e125b4522e5a3963a1119499e4..2dcdc428028a40c06b0ec1e50af76c16f051f084 100644
--- a/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
+++ b/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
@@ -1181,6 +1181,16 @@ 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);