Paper/nms-patches/EntityBoat.patch

--- a/net/minecraft/server/EntityBoat.java
+++ b/net/minecraft/server/EntityBoat.java
@@ -2,6 +2,16 @@
 
 import java.util.List;
 
+// CraftBukkit start
+import org.bukkit.Location;
+import org.bukkit.craftbukkit.event.CraftEventFactory;
+import org.bukkit.entity.Vehicle;
+import org.bukkit.event.vehicle.VehicleDamageEvent;
+import org.bukkit.event.vehicle.VehicleDestroyEvent;
+import org.bukkit.event.vehicle.VehicleEntityCollisionEvent;
+import org.bukkit.event.vehicle.VehicleMoveEvent;
+// CraftBukkit end
+
 public class EntityBoat extends Entity {
 
     private boolean a;
@@ -13,6 +23,27 @@
     private double g;
     private double h;
 
+    // CraftBukkit start
+    public double maxSpeed = 0.4D;
+    public double occupiedDeceleration = 0.2D;
+    public double unoccupiedDeceleration = -1;
+    public boolean landBoats = false;
+
+    @Override
+    public void collide(Entity entity) {
+        org.bukkit.entity.Entity hitEntity = (entity == null) ? null : entity.getBukkitEntity();
+
+        VehicleEntityCollisionEvent event = new VehicleEntityCollisionEvent((Vehicle) this.getBukkitEntity(), hitEntity);
+        this.world.getServer().getPluginManager().callEvent(event);
+
+        if (event.isCancelled()) {
+            return;
+        }
+
+        super.collide(entity);
+    }
+    // CraftBukkit end
+
     public EntityBoat(World world) {
         super(world);
         this.a = true;
@@ -52,6 +83,8 @@
         this.lastX = d0;
         this.lastY = d1;
         this.lastZ = d2;
+
+        this.world.getServer().getPluginManager().callEvent(new org.bukkit.event.vehicle.VehicleCreateEvent((Vehicle) this.getBukkitEntity())); // CraftBukkit
     }
 
     public double an() {
@@ -65,6 +98,19 @@
             if (this.passenger != null && this.passenger == damagesource.getEntity() && damagesource instanceof EntityDamageSourceIndirect) {
                 return false;
             } else {
+                // CraftBukkit start
+                Vehicle vehicle = (Vehicle) this.getBukkitEntity();
+                org.bukkit.entity.Entity attacker = (damagesource.getEntity() == null) ? null : damagesource.getEntity().getBukkitEntity();
+
+                VehicleDamageEvent event = new VehicleDamageEvent(vehicle, attacker, (double) f);
+                this.world.getServer().getPluginManager().callEvent(event);
+
+                if (event.isCancelled()) {
+                    return true;
+                }
+                // f = event.getDamage(); // TODO Why don't we do this?
+                // CraftBukkit end
+
                 this.b(-this.m());
                 this.a(10);
                 this.setDamage(this.j() + f * 10.0F);
@@ -72,6 +118,15 @@
                 boolean flag = damagesource.getEntity() instanceof EntityHuman && ((EntityHuman) damagesource.getEntity()).abilities.canInstantlyBuild;
 
                 if (flag || this.j() > 40.0F) {
+                    // CraftBukkit start
+                    VehicleDestroyEvent destroyEvent = new VehicleDestroyEvent(vehicle, attacker);
+                    this.world.getServer().getPluginManager().callEvent(destroyEvent);
+
+                    if (destroyEvent.isCancelled()) {
+                        this.setDamage(40F); // Maximize damage so this doesn't get triggered again right away
+                        return true;
+                    }
+                    // CraftBukkit end
                     if (this.passenger != null) {
                         this.passenger.mount(this);
                     }
@@ -95,6 +150,13 @@
     }
 
     public void t_() {
+        // CraftBukkit start
+        double prevX = this.locX;
+        double prevY = this.locY;
+        double prevZ = this.locZ;
+        float prevYaw = this.yaw;
+        float prevPitch = this.pitch;
+        // CraftBukkit end
         super.t_();
         if (this.l() > 0) {
             this.a(this.l() - 1);
@@ -196,6 +258,19 @@
                 this.motX += -Math.sin((double) (f * 3.1415927F / 180.0F)) * this.b * (double) entityliving.ba * 0.05000000074505806D;
                 this.motZ += Math.cos((double) (f * 3.1415927F / 180.0F)) * this.b * (double) entityliving.ba * 0.05000000074505806D;
             }
+            // CraftBukkit start - Support unoccupied deceleration
+            else if (unoccupiedDeceleration >= 0) {
+                this.motX *= unoccupiedDeceleration;
+                this.motZ *= unoccupiedDeceleration;
+                // Kill lingering speed
+                if (motX <= 0.00001) {
+                    motX = 0;
+                }
+                if (motZ <= 0.00001) {
+                    motZ = 0;
+                }
+            }
+            // CraftBukkit end
 
             d4 = Math.sqrt(this.motX * this.motX + this.motZ * this.motZ);
             if (d4 > 0.35D) {
@@ -230,16 +305,26 @@
                     Block block = this.world.getType(blockposition).getBlock();
 
                     if (block == Blocks.SNOW_LAYER) {
+                        // CraftBukkit start
+                        if (CraftEventFactory.callEntityChangeBlockEvent(this, l, j1, j, Blocks.AIR, 0).isCancelled()) {
+                            continue;
+                        }
+                        // CraftBukkit end
                         this.world.setAir(blockposition);
                         this.positionChanged = false;
                     } else if (block == Blocks.WATERLILY) {
+                        // CraftBukkit start
+                        if (CraftEventFactory.callEntityChangeBlockEvent(this, l, j1, j, Blocks.AIR, 0).isCancelled()) {
+                            continue;
+                        }
+                        // CraftBukkit end
                         this.world.setAir(blockposition, true);
                         this.positionChanged = false;
                     }
                 }
             }
 
-            if (this.onGround) {
+            if (this.onGround && !this.landBoats) { // CraftBukkit
                 this.motX *= 0.5D;
                 this.motY *= 0.5D;
                 this.motZ *= 0.5D;
@@ -248,6 +333,11 @@
             this.move(this.motX, this.motY, this.motZ);
             if (this.positionChanged && d3 > 0.2975D) {
                 if (!this.world.isClientSide && !this.dead) {
+                    // CraftBukkit start
+                    Vehicle vehicle = (Vehicle) this.getBukkitEntity();
+                    VehicleDestroyEvent destroyEvent = new VehicleDestroyEvent(vehicle, null);
+                    this.world.getServer().getPluginManager().callEvent(destroyEvent);
+                    if (!destroyEvent.isCancelled()) {
                     this.die();
                     if (this.world.getGameRules().getBoolean("doEntityDrops")) {
                         for (k = 0; k < 3; ++k) {
@@ -258,6 +348,7 @@
                             this.a(Items.STICK, 1, 0.0F);
                         }
                     }
+                    } // CraftBukkit end
                 }
             } else {
                 this.motX *= 0.9900000095367432D;
@@ -285,6 +376,22 @@
 
             this.yaw = (float) ((double) this.yaw + d12);
             this.setYawPitch(this.yaw, this.pitch);
+
+            // CraftBukkit start
+            org.bukkit.Server server = this.world.getServer();
+            org.bukkit.World bworld = this.world.getWorld();
+
+            Location from = new Location(bworld, prevX, prevY, prevZ, prevYaw, prevPitch);
+            Location to = new Location(bworld, this.locX, this.locY, this.locZ, this.yaw, this.pitch);
+            Vehicle vehicle = (Vehicle) this.getBukkitEntity();
+
+            server.getPluginManager().callEvent(new org.bukkit.event.vehicle.VehicleUpdateEvent(vehicle));
+
+            if (!from.equals(to)) {
+                VehicleMoveEvent event = new VehicleMoveEvent(vehicle, from, to);
+                server.getPluginManager().callEvent(event);
+            }
+            // CraftBukkit end
             if (!this.world.isClientSide) {
                 List list = this.world.getEntities(this, this.getBoundingBox().grow(0.20000000298023224D, 0.0D, 0.20000000298023224D));
 
@@ -299,6 +406,7 @@
                 }
 
                 if (this.passenger != null && this.passenger.dead) {
+                    this.passenger.vehicle = null; // CraftBukkit
                     this.passenger = null;
                 }
 
@@ -336,6 +444,11 @@
             if (this.fallDistance > 3.0F) {
                 this.e(this.fallDistance, 1.0F);
                 if (!this.world.isClientSide && !this.dead) {
+                    // CraftBukkit start
+                    Vehicle vehicle = (Vehicle) this.getBukkitEntity();
+                    VehicleDestroyEvent destroyEvent = new VehicleDestroyEvent(vehicle, null);
+                    this.world.getServer().getPluginManager().callEvent(destroyEvent);
+                    if (!destroyEvent.isCancelled()) {
                     this.die();
                     if (this.world.getGameRules().getBoolean("doEntityDrops")) {
                         int i;
@@ -348,6 +461,7 @@
                             this.a(Items.STICK, 1, 0.0F);
                         }
                     }
+                    } // CraftBukkit end
                 }
 
                 this.fallDistance = 0.0F;