Paper-Old/patches/server/0692-More-Projectile-API.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Owen1212055 <23108066+Owen1212055@users.noreply.github.com>
Date: Tue, 22 Jun 2021 23:41:11 -0400
Subject: [PATCH] More Projectile API

== AT ==
public net.minecraft.world.entity.projectile.FishingHook timeUntilLured
public net.minecraft.world.entity.projectile.ShulkerBullet targetDeltaX
public net.minecraft.world.entity.projectile.ShulkerBullet targetDeltaY
public net.minecraft.world.entity.projectile.ShulkerBullet targetDeltaZ
public net.minecraft.world.entity.projectile.ShulkerBullet currentMoveDirection
public net.minecraft.world.entity.projectile.ShulkerBullet flightSteps
public net.minecraft.world.entity.projectile.AbstractArrow soundEvent
public net.minecraft.world.entity.projectile.ThrownTrident dealtDamage
public net.minecraft.world.entity.projectile.Projectile hasBeenShot
public net.minecraft.world.entity.projectile.Projectile leftOwner
public net.minecraft.world.entity.projectile.Projectile preOnHit(Lnet/minecraft/world/phys/HitResult;)V
public net.minecraft.world.entity.projectile.Projectile canHitEntity(Lnet/minecraft/world/entity/Entity;)Z
public net.minecraft.world.entity.projectile.FireworkRocketEntity getDefaultItem()Lnet/minecraft/world/item/ItemStack;

Co-authored-by: Nassim Jahnke <nassim@njahnke.dev>

diff --git a/src/main/java/net/minecraft/world/entity/projectile/Projectile.java b/src/main/java/net/minecraft/world/entity/projectile/Projectile.java
index 40348e45b02be9a0b397a883940a476fb6738ef4..ccb7aa341e3087255bce1f6fb953d33584147fd3 100644
--- a/src/main/java/net/minecraft/world/entity/projectile/Projectile.java
+++ b/src/main/java/net/minecraft/world/entity/projectile/Projectile.java
@@ -180,7 +180,7 @@ public abstract class Projectile extends Entity implements TraceableEntity {
     }
 
     // CraftBukkit start - call projectile hit event
-    protected ProjectileDeflection preHitTargetOrDeflectSelf(HitResult movingobjectposition) {
+    public ProjectileDeflection preHitTargetOrDeflectSelf(HitResult movingobjectposition) { // Paper - protected -> public
         org.bukkit.event.entity.ProjectileHitEvent event = org.bukkit.craftbukkit.event.CraftEventFactory.callProjectileHitEvent(this, movingobjectposition);
         this.hitCancelled = event != null && event.isCancelled();
         if (movingobjectposition.getType() == HitResult.Type.BLOCK || !this.hitCancelled) {
diff --git a/src/main/java/net/minecraft/world/entity/projectile/ThrownPotion.java b/src/main/java/net/minecraft/world/entity/projectile/ThrownPotion.java
index bf627d66310f201172d3cd3ea12f1d321cd3cd62..5adaeb59f7733809f1cf6b52031292c9611a3a86 100644
--- a/src/main/java/net/minecraft/world/entity/projectile/ThrownPotion.java
+++ b/src/main/java/net/minecraft/world/entity/projectile/ThrownPotion.java
@@ -100,6 +100,11 @@ public class ThrownPotion extends ThrowableItemProjectile implements ItemSupplie
     @Override
     protected void onHit(HitResult hitResult) {
         super.onHit(hitResult);
+        // Paper start - More projectile API
+        this.splash(hitResult);
+    }
+    public void splash(@Nullable HitResult hitResult) {
+        // Paper end - More projectile API
         if (!this.level().isClientSide) {
             ItemStack itemstack = this.getItem();
             PotionContents potioncontents = (PotionContents) itemstack.getOrDefault(DataComponents.POTION_CONTENTS, PotionContents.EMPTY);
@@ -111,7 +116,7 @@ public class ThrownPotion extends ThrowableItemProjectile implements ItemSupplie
                 if (this.isLingering()) {
                     showParticles = this.makeAreaOfEffectCloud(potioncontents, hitResult); // CraftBukkit - Pass MovingObjectPosition // Paper
                 } else {
-                    showParticles = this.applySplash(potioncontents.getAllEffects(), hitResult.getType() == HitResult.Type.ENTITY ? ((EntityHitResult) hitResult).getEntity() : null, hitResult); // CraftBukkit - Pass MovingObjectPosition // Paper
+                    showParticles = this.applySplash(potioncontents.getAllEffects(), hitResult != null && hitResult.getType() == HitResult.Type.ENTITY ? ((EntityHitResult) hitResult).getEntity() : null, hitResult); // CraftBukkit - Pass MovingObjectPosition // Paper - More projectile API
                 }
             }
 
@@ -173,7 +178,7 @@ public class ThrownPotion extends ThrowableItemProjectile implements ItemSupplie
 
     }
 
-    private boolean applySplash(Iterable<MobEffectInstance> iterable, @Nullable Entity entity, HitResult position) { // CraftBukkit - Pass MovingObjectPosition // Paper - Fix potions splash events
+    private boolean applySplash(Iterable<MobEffectInstance> iterable, @Nullable Entity entity, @Nullable HitResult position) { // CraftBukkit - Pass MovingObjectPosition // Paper - Fix potions splash events & More projectile API
         AABB axisalignedbb = this.getBoundingBox().inflate(4.0D, 2.0D, 4.0D);
         List<net.minecraft.world.entity.LivingEntity> list = this.level().getEntitiesOfClass(net.minecraft.world.entity.LivingEntity.class, axisalignedbb);
         Map<LivingEntity, Double> affected = new HashMap<LivingEntity, Double>(); // CraftBukkit
@@ -251,7 +256,7 @@ public class ThrownPotion extends ThrowableItemProjectile implements ItemSupplie
 
     }
 
-    private boolean makeAreaOfEffectCloud(PotionContents potioncontents, HitResult position) { // CraftBukkit - Pass MovingObjectPosition
+    private boolean makeAreaOfEffectCloud(PotionContents potioncontents, @Nullable HitResult position) { // CraftBukkit - Pass MovingObjectPosition // Paper - More projectile API
         AreaEffectCloud entityareaeffectcloud = new AreaEffectCloud(this.level(), this.getX(), this.getY(), this.getZ());
         Entity entity = this.getOwner();
 
diff --git a/src/main/java/org/bukkit/craftbukkit/entity/AbstractProjectile.java b/src/main/java/org/bukkit/craftbukkit/entity/AbstractProjectile.java
index 91c2d0b40d3fca86938cd454e1415a4eea3df7c7..de4fb2654c7895cfd83ad694455ee56cb708c2f2 100644
--- a/src/main/java/org/bukkit/craftbukkit/entity/AbstractProjectile.java
+++ b/src/main/java/org/bukkit/craftbukkit/entity/AbstractProjectile.java
@@ -17,4 +17,65 @@ public abstract class AbstractProjectile extends CraftEntity implements Projecti
     @Override
     public void setBounce(boolean doesBounce) {}
 
+    // Paper start - More projectile API
+    @Override
+    public boolean hasLeftShooter() {
+        return this.getHandle().leftOwner;
+    }
+
+    @Override
+    public void setHasLeftShooter(boolean leftShooter) {
+        this.getHandle().leftOwner = leftShooter;
+    }
+
+    @Override
+    public boolean hasBeenShot() {
+        return this.getHandle().hasBeenShot;
+    }
+
+    @Override
+    public void setHasBeenShot(boolean beenShot) {
+        this.getHandle().hasBeenShot = beenShot;
+    }
+
+    @Override
+    public boolean canHitEntity(org.bukkit.entity.Entity entity) {
+        return this.getHandle().canHitEntity(((CraftEntity) entity).getHandle());
+    }
+
+    @Override
+    public void hitEntity(org.bukkit.entity.Entity entity) {
+        this.getHandle().preHitTargetOrDeflectSelf(new net.minecraft.world.phys.EntityHitResult(((CraftEntity) entity).getHandle()));
+    }
+
+    @Override
+    public void hitEntity(org.bukkit.entity.Entity entity, org.bukkit.util.Vector vector) {
+        this.getHandle().preHitTargetOrDeflectSelf(new net.minecraft.world.phys.EntityHitResult(((CraftEntity) entity).getHandle(), new net.minecraft.world.phys.Vec3(vector.getX(), vector.getY(), vector.getZ())));
+    }
+
+    @Override
+    public net.minecraft.world.entity.projectile.Projectile getHandle() {
+        return (net.minecraft.world.entity.projectile.Projectile) entity;
+    }
+
+    @Override
+    public final org.bukkit.projectiles.ProjectileSource getShooter() {
+        return this.getHandle().projectileSource;
+    }
+
+    @Override
+    public final void setShooter(org.bukkit.projectiles.ProjectileSource shooter) {
+        if (shooter instanceof CraftEntity craftEntity) {
+            this.getHandle().setOwner(craftEntity.getHandle());
+        } else {
+            this.getHandle().setOwner(null);
+        }
+        this.getHandle().projectileSource = shooter;
+    }
+
+    @Override
+    public java.util.UUID getOwnerUniqueId() {
+        return this.getHandle().ownerUUID;
+    }
+    // Paper end - More projectile API
 }
diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftAbstractArrow.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftAbstractArrow.java
index 98f46fadd60ea688fefa8d83dbd6fe9b61b6a96f..d4e0170694409e674d488f913e61c205f6483712 100644
--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftAbstractArrow.java
+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftAbstractArrow.java
@@ -60,20 +60,7 @@ public class CraftAbstractArrow extends AbstractProjectile implements AbstractAr
         this.getHandle().setCritArrow(critical);
     }
 
-    @Override
-    public ProjectileSource getShooter() {
-        return this.getHandle().projectileSource;
-    }
-
-    @Override
-    public void setShooter(ProjectileSource shooter) {
-        if (shooter instanceof Entity) {
-            this.getHandle().setOwner(((CraftEntity) shooter).getHandle());
-        } else {
-            this.getHandle().setOwner(null);
-        }
-        this.getHandle().projectileSource = shooter;
-    }
+    // Paper - moved to AbstractProjectil
 
     @Override
     public boolean isInBlock() {
@@ -140,4 +127,31 @@ public class CraftAbstractArrow extends AbstractProjectile implements AbstractAr
     public String toString() {
         return "CraftArrow";
     }
+
+    // Paper start
+    @Override
+    public org.bukkit.craftbukkit.inventory.CraftItemStack getItemStack() {
+        return org.bukkit.craftbukkit.inventory.CraftItemStack.asCraftMirror(this.getHandle().getPickupItem());
+    }
+
+    @Override
+    public void setLifetimeTicks(int ticks) {
+        this.getHandle().life = ticks;
+    }
+
+    @Override
+    public int getLifetimeTicks() {
+        return this.getHandle().life;
+    }
+
+    @Override
+    public org.bukkit.Sound getHitSound() {
+        return org.bukkit.craftbukkit.CraftSound.minecraftToBukkit(this.getHandle().soundEvent);
+    }
+
+    @Override
+    public void setHitSound(org.bukkit.Sound sound) {
+        this.getHandle().setSoundEvent(org.bukkit.craftbukkit.CraftSound.bukkitToMinecraft(sound));
+    }
+    // Paper end
 }
diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftEntityTypes.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftEntityTypes.java
index 7ba6302ecb72fa6e523054e7e3223d79eedf6589..907904da7f89e8e5e5cfab80977f04af3fdf17c7 100644
--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftEntityTypes.java
+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftEntityTypes.java
@@ -388,7 +388,7 @@ public final class CraftEntityTypes {
             BlockPos pos = BlockPos.containing(spawnData.x(), spawnData.y(), spawnData.z());
             return new FallingBlockEntity(spawnData.minecraftWorld(), spawnData.x(), spawnData.y(), spawnData.z(), spawnData.world().getBlockState(pos)); // Paper - create falling block entities correctly
         }));
-        register(new EntityTypeData<>(EntityType.FIREWORK_ROCKET, Firework.class, CraftFirework::new, spawnData -> new FireworkRocketEntity(spawnData.minecraftWorld(), spawnData.x(), spawnData.y(), spawnData.z(), net.minecraft.world.item.ItemStack.EMPTY)));
+        register(new EntityTypeData<>(EntityType.FIREWORK_ROCKET, Firework.class, CraftFirework::new, spawnData -> new FireworkRocketEntity(spawnData.minecraftWorld(), spawnData.x(), spawnData.y(), spawnData.z(), FireworkRocketEntity.getDefaultItem()))); // Paper - pass correct default to rocket for data storage
         register(new EntityTypeData<>(EntityType.EVOKER_FANGS, EvokerFangs.class, CraftEvokerFangs::new, spawnData -> new net.minecraft.world.entity.projectile.EvokerFangs(spawnData.minecraftWorld(), spawnData.x(), spawnData.y(), spawnData.z(), (float) Math.toRadians(spawnData.yaw()), 0, null)));
         register(new EntityTypeData<>(EntityType.COMMAND_BLOCK_MINECART, CommandMinecart.class, CraftMinecartCommand::new, spawnData -> new MinecartCommandBlock(spawnData.minecraftWorld(), spawnData.x(), spawnData.y(), spawnData.z())));
         register(new EntityTypeData<>(EntityType.MINECART, RideableMinecart.class, CraftMinecartRideable::new, spawnData -> new Minecart(spawnData.minecraftWorld(), spawnData.x(), spawnData.y(), spawnData.z())));
diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftFireball.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftFireball.java
index e4e23a7b6d308ee476b5b8c2ad80efe4608b8346..241914415f74e0559fef59aa3f87f3e303f6c2c4 100644
--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftFireball.java
+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftFireball.java
@@ -32,20 +32,7 @@ public class CraftFireball extends AbstractProjectile implements Fireball {
         this.getHandle().bukkitYield = yield;
     }
 
-    @Override
-    public ProjectileSource getShooter() {
-        return this.getHandle().projectileSource;
-    }
-
-    @Override
-    public void setShooter(ProjectileSource shooter) {
-        if (shooter instanceof CraftLivingEntity) {
-            this.getHandle().setOwner(((CraftLivingEntity) shooter).getHandle());
-        } else {
-            this.getHandle().setOwner(null);
-        }
-        this.getHandle().projectileSource = shooter;
-    }
+    // Paper - moved to AbstractProjectile
 
     @Override
     public Vector getDirection() {
diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftFirework.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftFirework.java
index c9e15a9d82dee935293b2e7e233f5b9b2d822448..fedbfbac02b73382aacc69f8a1e5a3e746c55ea2 100644
--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftFirework.java
+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftFirework.java
@@ -15,24 +15,26 @@ import org.bukkit.inventory.meta.FireworkMeta;
 public class CraftFirework extends CraftProjectile implements Firework {
 
     private final Random random = new Random();
-    private final CraftItemStack item;
+    //private CraftItemStack item; // Paper - Remove usage, not accurate representation of current item.
 
     public CraftFirework(CraftServer server, FireworkRocketEntity entity) {
         super(server, entity);
 
-        ItemStack item = this.getHandle().getEntityData().get(FireworkRocketEntity.DATA_ID_FIREWORKS_ITEM);
-
-        if (item.isEmpty()) {
-            item = new ItemStack(Items.FIREWORK_ROCKET);
-            this.getHandle().getEntityData().set(FireworkRocketEntity.DATA_ID_FIREWORKS_ITEM, item);
-        }
-
-        this.item = CraftItemStack.asCraftMirror(item);
-
-        // Ensure the item is a firework...
-        if (this.item.getType() != Material.FIREWORK_ROCKET) {
-            this.item.setType(Material.FIREWORK_ROCKET);
-        }
+//        Paper start - Expose firework item directly
+//        ItemStack item = this.getHandle().getEntityData().get(FireworkRocketEntity.DATA_ID_FIREWORKS_ITEM);
+//
+//        if (item.isEmpty()) {
+//            item = new ItemStack(Items.FIREWORK_ROCKET);
+//            this.getHandle().getEntityData().set(FireworkRocketEntity.DATA_ID_FIREWORKS_ITEM, item);
+//        }
+//
+//        this.item = CraftItemStack.asCraftMirror(item);
+//
+//        // Ensure the item is a firework...
+//        if (this.item.getType() != Material.FIREWORK_ROCKET) {
+//            this.item.setType(Material.FIREWORK_ROCKET);
+//        }
+        // Paper end - Expose firework item directly
     }
 
     @Override
@@ -47,12 +49,12 @@ public class CraftFirework extends CraftProjectile implements Firework {
 
     @Override
     public FireworkMeta getFireworkMeta() {
-        return (FireworkMeta) this.item.getItemMeta();
+        return (FireworkMeta) CraftItemStack.getItemMeta(this.getHandle().getEntityData().get(FireworkRocketEntity.DATA_ID_FIREWORKS_ITEM), Material.FIREWORK_ROCKET); // Paper - Expose firework item directly
     }
 
     @Override
     public void setFireworkMeta(FireworkMeta meta) {
-        this.item.setItemMeta(meta);
+        applyFireworkEffect(meta); // Paper - Expose firework item directly
 
         // Copied from EntityFireworks constructor, update firework lifetime/power
         this.getHandle().lifetime = 10 * (1 + meta.getPower()) + this.random.nextInt(6) + this.random.nextInt(7);
@@ -136,4 +138,46 @@ public class CraftFirework extends CraftProjectile implements Firework {
         return getHandle().spawningEntity;
     }
     // Paper end
+    // Paper start - Expose firework item directly + manually setting flight
+    @Override
+    public org.bukkit.inventory.ItemStack getItem() {
+        return CraftItemStack.asBukkitCopy(this.getHandle().getItem());
+    }
+
+    @Override
+    public void setItem(org.bukkit.inventory.ItemStack itemStack) {
+        FireworkMeta meta = getFireworkMeta();
+        ItemStack nmsItem = itemStack == null ? ItemStack.EMPTY : CraftItemStack.asNMSCopy(itemStack);
+        this.getHandle().getEntityData().set(FireworkRocketEntity.DATA_ID_FIREWORKS_ITEM, nmsItem);
+
+        applyFireworkEffect(meta);
+    }
+
+    @Override
+    public int getTicksFlown() {
+        return this.getHandle().life;
+    }
+
+    @Override
+    public void setTicksFlown(int ticks) {
+        this.getHandle().life = ticks;
+    }
+
+    @Override
+    public int getTicksToDetonate() {
+        return this.getHandle().lifetime;
+    }
+
+    @Override
+    public void setTicksToDetonate(int ticks) {
+        this.getHandle().lifetime = ticks;
+    }
+
+    void applyFireworkEffect(FireworkMeta meta) {
+        ItemStack item = this.getHandle().getItem();
+        CraftItemStack.applyMetaToItem(item, meta);
+
+        this.getHandle().getEntityData().set(FireworkRocketEntity.DATA_ID_FIREWORKS_ITEM, item);
+    }
+    // Paper end - Expose firework item directly + manually setting flight
 }
diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftFishHook.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftFishHook.java
index 6e2f91423371ead9890095cf4b1e2299c4dcba28..ad1aeea80877f2cdb9e8ad9c5b46f95dd76b3335 100644
--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftFishHook.java
+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftFishHook.java
@@ -196,4 +196,15 @@ public class CraftFishHook extends CraftProjectile implements FishHook {
     public HookState getState() {
         return HookState.values()[this.getHandle().currentState.ordinal()];
     }
+    // Paper start - More FishHook API
+    @Override
+    public int getWaitTime() {
+        return this.getHandle().timeUntilLured;
+    }
+
+    @Override
+    public void setWaitTime(int ticks) {
+        this.getHandle().timeUntilLured = ticks;
+    }
+    // Paper end
 }
diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftLivingEntity.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftLivingEntity.java
index a4c6fd2f6066ecc4a36a423cb2980ec60d9c7ec1..382b4f0854284a561325dde141000434a9ddd885 100644
--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftLivingEntity.java
+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftLivingEntity.java
@@ -640,7 +640,7 @@ public class CraftLivingEntity extends CraftEntity implements LivingEntity {
         } else if (Firework.class.isAssignableFrom(projectile)) {
             Location location = this.getEyeLocation();
 
-            launch = new FireworkRocketEntity(world, net.minecraft.world.item.ItemStack.EMPTY, this.getHandle());
+            launch = new FireworkRocketEntity(world, FireworkRocketEntity.getDefaultItem(), this.getHandle()); // Paper - pass correct default to rocket for data storage
             launch.moveTo(location.getX(), location.getY(), location.getZ(), location.getYaw(), location.getPitch());
         }
 
diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftLlamaSpit.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftLlamaSpit.java
index 70cbc6c668c60e9d608ca7013b72f9b916c05c2d..47633f05b4fab1dcabc2117e7645fe6d6949622a 100644
--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftLlamaSpit.java
+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftLlamaSpit.java
@@ -20,13 +20,5 @@ public class CraftLlamaSpit extends AbstractProjectile implements LlamaSpit {
         return "CraftLlamaSpit";
     }
 
-    @Override
-    public ProjectileSource getShooter() {
-        return (this.getHandle().getOwner() != null) ? (ProjectileSource) this.getHandle().getOwner().getBukkitEntity() : null;
-    }
-
-    @Override
-    public void setShooter(ProjectileSource source) {
-        this.getHandle().setOwner((source != null) ? ((CraftLivingEntity) source).getHandle() : null);
-    }
+    // Paper - moved to AbstractProjectile
 }
diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftProjectile.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftProjectile.java
index 696fdfa723aa896a67946f862d7c6890f7f7ab17..4f1fa7dec78970bdfc184d3c1f1632dc9d75a574 100644
--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftProjectile.java
+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftProjectile.java
@@ -10,20 +10,7 @@ public abstract class CraftProjectile extends AbstractProjectile implements Proj
         super(server, entity);
     }
 
-    @Override
-    public ProjectileSource getShooter() {
-        return this.getHandle().projectileSource;
-    }
-
-    @Override
-    public void setShooter(ProjectileSource shooter) {
-        if (shooter instanceof CraftLivingEntity) {
-            this.getHandle().setOwner((LivingEntity) ((CraftLivingEntity) shooter).entity);
-        } else {
-            this.getHandle().setOwner(null);
-        }
-        this.getHandle().projectileSource = shooter;
-    }
+    // Paper - moved to AbstractProjectile
 
     @Override
     public net.minecraft.world.entity.projectile.Projectile getHandle() {
diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftShulkerBullet.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftShulkerBullet.java
index d685d09cae5f862c0004f148298c800736d2139e..636c4481e3afdf20197e502cf221f5d34d18f101 100644
--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftShulkerBullet.java
+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftShulkerBullet.java
@@ -12,20 +12,7 @@ public class CraftShulkerBullet extends AbstractProjectile implements ShulkerBul
         super(server, entity);
     }
 
-    @Override
-    public ProjectileSource getShooter() {
-        return this.getHandle().projectileSource;
-    }
-
-    @Override
-    public void setShooter(ProjectileSource shooter) {
-        if (shooter instanceof Entity) {
-            this.getHandle().setOwner(((CraftEntity) shooter).getHandle());
-        } else {
-            this.getHandle().setOwner(null);
-        }
-        this.getHandle().projectileSource = shooter;
-    }
+    // Paper - moved to AbstractProjectile
 
     @Override
     public org.bukkit.entity.Entity getTarget() {
@@ -39,6 +26,40 @@ public class CraftShulkerBullet extends AbstractProjectile implements ShulkerBul
         this.getHandle().setTarget(target == null ? null : ((CraftEntity) target).getHandle());
     }
 
+    @Override
+    public org.bukkit.util.Vector getTargetDelta() {
+        net.minecraft.world.entity.projectile.ShulkerBullet bullet = this.getHandle();
+        return new org.bukkit.util.Vector(bullet.targetDeltaX, bullet.targetDeltaY, bullet.targetDeltaZ);
+    }
+
+    @Override
+    public void setTargetDelta(org.bukkit.util.Vector vector) {
+        net.minecraft.world.entity.projectile.ShulkerBullet bullet = this.getHandle();
+        bullet.targetDeltaX = vector.getX();
+        bullet.targetDeltaY = vector.getY();
+        bullet.targetDeltaZ = vector.getZ();
+    }
+
+    @Override
+    public org.bukkit.block.BlockFace getCurrentMovementDirection() {
+        return org.bukkit.craftbukkit.block.CraftBlock.notchToBlockFace(this.getHandle().currentMoveDirection);
+    }
+
+    @Override
+    public void setCurrentMovementDirection(org.bukkit.block.BlockFace movementDirection) {
+        this.getHandle().currentMoveDirection = org.bukkit.craftbukkit.block.CraftBlock.blockFaceToNotch(movementDirection);
+    }
+
+    @Override
+    public int getFlightSteps() {
+        return this.getHandle().flightSteps;
+    }
+
+    @Override
+    public void setFlightSteps(int steps) {
+        this.getHandle().flightSteps = steps;
+    }
+
     @Override
     public String toString() {
         return "CraftShulkerBullet";
diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftThrownPotion.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftThrownPotion.java
index d67a80161b3e7c1fe02a6ed9d341c00dc7c2847a..408a0a0433b97d7f97d758fd1dfa7975dbf8eccd 100644
--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftThrownPotion.java
+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftThrownPotion.java
@@ -36,11 +36,31 @@ public class CraftThrownPotion extends CraftThrowableProjectile implements Throw
     @Override
     public void setItem(ItemStack item) {
         Preconditions.checkArgument(item != null, "ItemStack cannot be null");
-        Preconditions.checkArgument(item.getType() == Material.LINGERING_POTION || item.getType() == Material.SPLASH_POTION, "ItemStack material must be Material.LINGERING_POTION or Material.SPLASH_POTION but was Material.%s", item.getType());
+        // Preconditions.checkArgument(item.getType() == Material.LINGERING_POTION || item.getType() == Material.SPLASH_POTION, "ItemStack material must be Material.LINGERING_POTION or Material.SPLASH_POTION but was Material.%s", item.getType()); // Paper - Projectile API
+        org.bukkit.inventory.meta.PotionMeta meta = (item.getType() == Material.LINGERING_POTION || item.getType() == Material.SPLASH_POTION) ? null : this.getPotionMeta(); // Paper - Projectile API
 
         this.getHandle().setItem(CraftItemStack.asNMSCopy(item));
+        if (meta != null) this.setPotionMeta(meta); // Paper - Projectile API
     }
 
+    // Paper start - Projectile API
+    @Override
+    public org.bukkit.inventory.meta.PotionMeta getPotionMeta() {
+        return (org.bukkit.inventory.meta.PotionMeta) CraftItemStack.getItemMeta(this.getHandle().getItem(), Material.SPLASH_POTION);
+    }
+
+    @Override
+    public void setPotionMeta(org.bukkit.inventory.meta.PotionMeta meta) {
+        net.minecraft.world.item.ItemStack item = this.getHandle().getItem();
+        CraftItemStack.applyMetaToItem(item, meta);
+        this.getHandle().setItem(item); // Reset item
+    }
+
+    @Override
+    public void splash() {
+        this.getHandle().splash(null);
+    }
+    // Paper end
     @Override
     public net.minecraft.world.entity.projectile.ThrownPotion getHandle() {
         return (net.minecraft.world.entity.projectile.ThrownPotion) this.entity;
diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftTrident.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftTrident.java
index e374b9f40eddca13b30855d25a2030f8df98138f..4fc893378fb0568ddcffc7593d66df6bfe23f659 100644
--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftTrident.java
+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftTrident.java
@@ -53,5 +53,15 @@ public class CraftTrident extends CraftAbstractArrow implements Trident {
         com.google.common.base.Preconditions.checkArgument(loyaltyLevel >= 0 && loyaltyLevel <= 127, "The loyalty level has to be between 0 and 127");
         this.getHandle().setLoyalty((byte) loyaltyLevel);
     }
+
+    @Override
+    public boolean hasDealtDamage() {
+        return this.getHandle().dealtDamage;
+    }
+
+    @Override
+    public void setHasDealtDamage(boolean hasDealtDamage) {
+        this.getHandle().dealtDamage = hasDealtDamage;
+    }
     // Paper end
 }
diff --git a/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java b/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
index 5c31c652a3b956dd638137307d1a8b2ee4c3f675..90696beb3ca48fc28c9842589bc3ea398af7d422 100644
--- a/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
+++ b/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
@@ -832,19 +832,19 @@ public class CraftEventFactory {
     /**
      * PotionSplashEvent
      */
-    public static PotionSplashEvent callPotionSplashEvent(net.minecraft.world.entity.projectile.ThrownPotion potion, HitResult position, Map<LivingEntity, Double> affectedEntities) {
+    public static PotionSplashEvent callPotionSplashEvent(net.minecraft.world.entity.projectile.ThrownPotion potion, @Nullable HitResult position, Map<LivingEntity, Double> affectedEntities) { // Paper - nullable hitResult
         ThrownPotion thrownPotion = (ThrownPotion) potion.getBukkitEntity();
 
         Block hitBlock = null;
         BlockFace hitFace = null;
-        if (position.getType() == HitResult.Type.BLOCK) {
+        if (position != null && position.getType() == HitResult.Type.BLOCK) { // Paper - nullable hitResult
             BlockHitResult positionBlock = (BlockHitResult) position;
             hitBlock = CraftBlock.at(potion.level(), positionBlock.getBlockPos());
             hitFace = CraftBlock.notchToBlockFace(positionBlock.getDirection());
         }
 
         org.bukkit.entity.Entity hitEntity = null;
-        if (position.getType() == HitResult.Type.ENTITY) {
+        if (position != null && position.getType() == HitResult.Type.ENTITY) { // Paper - nullable hitResult
             hitEntity = ((EntityHitResult) position).getEntity().getBukkitEntity();
         }
 
@@ -853,20 +853,20 @@ public class CraftEventFactory {
         return event;
     }
 
-    public static LingeringPotionSplashEvent callLingeringPotionSplashEvent(net.minecraft.world.entity.projectile.ThrownPotion potion, HitResult position, net.minecraft.world.entity.AreaEffectCloud cloud) {
+    public static LingeringPotionSplashEvent callLingeringPotionSplashEvent(net.minecraft.world.entity.projectile.ThrownPotion potion, @Nullable HitResult position, net.minecraft.world.entity.AreaEffectCloud cloud) { // Paper - nullable hitResult
         ThrownPotion thrownPotion = (ThrownPotion) potion.getBukkitEntity();
         AreaEffectCloud effectCloud = (AreaEffectCloud) cloud.getBukkitEntity();
 
         Block hitBlock = null;
         BlockFace hitFace = null;
-        if (position.getType() == HitResult.Type.BLOCK) {
+        if (position != null && position.getType() == HitResult.Type.BLOCK) { // Paper
             BlockHitResult positionBlock = (BlockHitResult) position;
             hitBlock = CraftBlock.at(potion.level(), positionBlock.getBlockPos());
             hitFace = CraftBlock.notchToBlockFace(positionBlock.getDirection());
         }
 
         org.bukkit.entity.Entity hitEntity = null;
-        if (position.getType() == HitResult.Type.ENTITY) {
+        if (position != null && position.getType() == HitResult.Type.ENTITY) { // Paper
             hitEntity = ((EntityHitResult) position).getEntity().getBukkitEntity();
         }
 
diff --git a/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java b/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java
index 3d226c03dbecf876bb5a50d493aceeb0f8f69d28..6352e56fa3e69690846842d474a1ae51ad4059c6 100644
--- a/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java
+++ b/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java
@@ -295,12 +295,22 @@ public final class CraftItemStack extends ItemStack {
     public ItemMeta getItemMeta() {
         return CraftItemStack.getItemMeta(this.handle);
     }
+    // Paper start
+    public static void applyMetaToItem(net.minecraft.world.item.ItemStack itemStack, ItemMeta itemMeta) {
+        final CraftMetaItem.Applicator tag = new CraftMetaItem.Applicator();
+        ((CraftMetaItem) itemMeta).applyToItem(tag);
+        itemStack.applyComponents(tag.build());
+    }
 
     public static ItemMeta getItemMeta(net.minecraft.world.item.ItemStack item) {
+        return getItemMeta(item, CraftItemStack.getType(item));
+    }
+    public static ItemMeta getItemMeta(net.minecraft.world.item.ItemStack item, Material material) {
+        // Paper end
         if (!CraftItemStack.hasItemMeta(item)) {
-            return CraftItemFactory.instance().getItemMeta(CraftItemStack.getType(item));
+            return CraftItemFactory.instance().getItemMeta(material); // Paper
         }
-        switch (CraftItemStack.getType(item)) {
+        switch (material) {  // Paper
             case WRITTEN_BOOK:
                 return new CraftMetaBookSigned(item.getComponentsPatch());
             case WRITABLE_BOOK: