[Bleeding] Implement ProjectileSource API. Addresses BUKKIT-1038, BUKKIT-1156

maps.yml

@@ -15,6 +15,8 @@ members:
   "org/bukkit/event/entity/EntityRegainHealthEvent _INVALID_setAmount (I)V": setAmount
   "org/bukkit/entity/Minecart _INVALID_getDamage ()I": getDamage
   "org/bukkit/entity/Minecart _INVALID_setDamage (I)V": setDamage
+  "org/bukkit/entity/Projectile _INVALID_getShooter ()Lorg/bukkit/entity/LivingEntity;": getShooter
+  "org/bukkit/entity/Projectile _INVALID_setShooter (Lorg/bukkit/entity/LivingEntity;)V": setShooter
 flags:
   "org/bukkit/craftbukkit/v${minecraft_version}/entity/CraftLivingEntity getHealth ()I": 0x1001
   "org/bukkit/craftbukkit/v${minecraft_version}/entity/CraftEnderDragonPart getHealth ()I": 0x1001
@@ -32,3 +34,11 @@ flags:
   "org/bukkit/craftbukkit/v${minecraft_version}/entity/CraftLivingEntity setLastDamage (I)V": 0x1001
   "org/bukkit/craftbukkit/v${minecraft_version}/entity/CraftMinecart setDamage (I)V": 0x1001
   "org/bukkit/craftbukkit/v${minecraft_version}/entity/CraftMinecart getDamage ()I": 0x1001
+  "org/bukkit/craftbukkit/v${minecraft_version}/entity/CraftProjectile getShooter ()Lorg/bukkit/entity/LivingEntity;": 0x1001
+  "org/bukkit/craftbukkit/v${minecraft_version}/entity/CraftProjectile setShooter (Lorg/bukkit/entity/LivingEntity;)V": 0x1001
+  "org/bukkit/craftbukkit/v${minecraft_version}/entity/CraftArrow getShooter ()Lorg/bukkit/entity/LivingEntity;": 0x1001
+  "org/bukkit/craftbukkit/v${minecraft_version}/entity/CraftArrow setShooter (Lorg/bukkit/entity/LivingEntity;)V": 0x1001
+  "org/bukkit/craftbukkit/v${minecraft_version}/entity/CraftFireball getShooter ()Lorg/bukkit/entity/LivingEntity;": 0x1001
+  "org/bukkit/craftbukkit/v${minecraft_version}/entity/CraftFireball setShooter (Lorg/bukkit/entity/LivingEntity;)V": 0x1001
+  "org/bukkit/craftbukkit/v${minecraft_version}/entity/CraftFish getShooter ()Lorg/bukkit/entity/LivingEntity;": 0x1001
+  "org/bukkit/craftbukkit/v${minecraft_version}/entity/CraftFish setShooter (Lorg/bukkit/entity/LivingEntity;)V": 0x1001

src/main/java/net/minecraft/server/DispenseBehaviorFireball.java

@@ -49,7 +49,10 @@ final class DispenseBehaviorFireball extends DispenseBehaviorItem {
             }
         }
 
-        world.addEntity(new EntitySmallFireball(world, d0, d1, d2, event.getVelocity().getX(), event.getVelocity().getY(), event.getVelocity().getZ()));
+        EntitySmallFireball entitysmallfireball = new EntitySmallFireball(world, d0, d1, d2, event.getVelocity().getX(), event.getVelocity().getY(), event.getVelocity().getZ());
+        entitysmallfireball.projectileSource = new org.bukkit.craftbukkit.projectiles.CraftBlockProjectileSource((TileEntityDispenser) isourceblock.getTileEntity());
+
+        world.addEntity(entitysmallfireball);
         // itemstack.a(1); // Handled during event processing
         // CraftBukkit end
 

src/main/java/net/minecraft/server/DispenseBehaviorProjectile.java

@@ -42,6 +42,7 @@ public abstract class DispenseBehaviorProjectile extends DispenseBehaviorItem {
         }
 
         iprojectile.shoot(event.getVelocity().getX(), event.getVelocity().getY(), event.getVelocity().getZ(), this.b(), this.a());
+        ((Entity) iprojectile).projectileSource = new org.bukkit.craftbukkit.projectiles.CraftBlockProjectileSource((TileEntityDispenser) isourceblock.getTileEntity());
         // CraftBukkit end
 
         world.addEntity((Entity) iprojectile);

src/main/java/net/minecraft/server/Entity.java

@@ -109,6 +109,7 @@ public abstract class Entity {
     public UUID uniqueID; // CraftBukkit - protected -> public
     public EnumEntitySize at;
     public boolean valid; // CraftBukkit
+    public org.bukkit.projectiles.ProjectileSource projectileSource; // CraftBukkit - For projectiles only
 
     public int getId() {
         return this.id;

src/main/java/net/minecraft/server/EntityArrow.java

@@ -3,6 +3,7 @@ package net.minecraft.server;
 import java.util.List;
 
 // CraftBukkit start
+import org.bukkit.entity.LivingEntity;
 import org.bukkit.event.entity.EntityCombustByEntityEvent;
 import org.bukkit.event.player.PlayerPickupItemEvent;
 // CraftBukkit end
@@ -41,6 +42,7 @@ public class EntityArrow extends Entity implements IProjectile {
         super(world);
         this.k = 10.0D;
         this.shooter = entityliving;
+        this.projectileSource = (LivingEntity) entityliving.getBukkitEntity(); // CraftBukkit
         if (entityliving instanceof EntityHuman) {
             this.fromPlayer = 1;
         }
@@ -69,6 +71,7 @@ public class EntityArrow extends Entity implements IProjectile {
         super(world);
         this.k = 10.0D;
         this.shooter = entityliving;
+        this.projectileSource = (LivingEntity) entityliving.getBukkitEntity(); // CraftBukkit
         if (entityliving instanceof EntityHuman) {
             this.fromPlayer = 1;
         }

src/main/java/net/minecraft/server/EntityFireball.java

@@ -42,6 +42,7 @@ public abstract class EntityFireball extends Entity {
     public EntityFireball(World world, EntityLiving entityliving, double d0, double d1, double d2) {
         super(world);
         this.shooter = entityliving;
+        this.projectileSource = (org.bukkit.entity.LivingEntity) entityliving.getBukkitEntity(); // CraftBukkit
         this.a(1.0F, 1.0F);
         this.setPositionRotation(entityliving.locX, entityliving.locY, entityliving.locZ, entityliving.yaw, entityliving.pitch);
         this.setPosition(this.locX, this.locY, this.locZ);

src/main/java/net/minecraft/server/EntityProjectile.java

@@ -25,6 +25,7 @@ public abstract class EntityProjectile extends Entity implements IProjectile {
     public EntityProjectile(World world, EntityLiving entityliving) {
         super(world);
         this.shooter = entityliving;
+        this.projectileSource = (org.bukkit.entity.LivingEntity) entityliving.getBukkitEntity(); // CraftBukkit
         this.a(0.25F, 0.25F);
         this.setPositionRotation(entityliving.locX, entityliving.locY + (double) entityliving.getHeadHeight(), entityliving.locZ, entityliving.yaw, entityliving.pitch);
         this.locX -= (double) (MathHelper.cos(this.yaw / 180.0F * 3.1415927F) * 0.16F);

src/main/java/org/bukkit/craftbukkit/block/CraftDispenser.java

@@ -3,12 +3,15 @@ package org.bukkit.craftbukkit.block;
 import net.minecraft.server.BlockDispenser;
 import net.minecraft.server.Blocks;
 import net.minecraft.server.TileEntityDispenser;
+
 import org.bukkit.Material;
 import org.bukkit.block.Block;
 import org.bukkit.block.Dispenser;
 import org.bukkit.craftbukkit.CraftWorld;
 import org.bukkit.craftbukkit.inventory.CraftInventory;
+import org.bukkit.craftbukkit.projectiles.CraftBlockProjectileSource;
 import org.bukkit.inventory.Inventory;
+import org.bukkit.projectiles.BlockProjectileSource;
 
 public class CraftDispenser extends CraftBlockState implements Dispenser {
     private final CraftWorld world;
@@ -25,6 +28,16 @@ public class CraftDispenser extends CraftBlockState implements Dispenser {
         return new CraftInventory(dispenser);
     }
 
+    public BlockProjectileSource getBlockProjectileSource() {
+        Block block = getBlock();
+
+        if (block.getType() != Material.DISPENSER) {
+            return null;
+        }
+
+        return new CraftBlockProjectileSource(dispenser);
+    }
+
     public boolean dispense() {
         Block block = getBlock();
 

src/main/java/org/bukkit/craftbukkit/entity/CraftArrow.java

@@ -7,6 +7,7 @@ import org.bukkit.craftbukkit.CraftServer;
 import org.bukkit.entity.Arrow;
 import org.bukkit.entity.EntityType;
 import org.bukkit.entity.LivingEntity;
+import org.bukkit.projectiles.ProjectileSource;
 
 public class CraftArrow extends AbstractProjectile implements Arrow {
 
@@ -14,20 +15,6 @@ public class CraftArrow extends AbstractProjectile implements Arrow {
         super(server, entity);
     }
 
-    public LivingEntity getShooter() {
-        if (getHandle().shooter != null) {
-            return (LivingEntity) getHandle().shooter.getBukkitEntity();
-        }
-
-        return null;
-    }
-
-    public void setShooter(LivingEntity shooter) {
-        if (shooter instanceof CraftLivingEntity) {
-            getHandle().shooter = ((CraftLivingEntity) shooter).getHandle();
-        }
-    }
-
     public void setKnockbackStrength(int knockbackStrength) {
         Validate.isTrue(knockbackStrength >= 0, "Knockback cannot be negative");
         getHandle().a(knockbackStrength);
@@ -45,6 +32,19 @@ public class CraftArrow extends AbstractProjectile implements Arrow {
         getHandle().a(critical);
     }
 
+    public ProjectileSource getShooter() {
+        return getHandle().projectileSource;
+    }
+
+    public void setShooter(ProjectileSource shooter) {
+        if (shooter instanceof LivingEntity) {
+            getHandle().shooter = ((CraftLivingEntity) shooter).getHandle();
+        } else {
+            getHandle().shooter = null;
+        }
+        getHandle().projectileSource = shooter;
+    }
+
     @Override
     public EntityArrow getHandle() {
         return (EntityArrow) entity;
@@ -58,4 +58,17 @@ public class CraftArrow extends AbstractProjectile implements Arrow {
     public EntityType getType() {
         return EntityType.ARROW;
     }
+
+    @Deprecated
+    public LivingEntity _INVALID_getShooter() {
+        if (getHandle().shooter == null) {
+            return null;
+        }
+        return (LivingEntity) getHandle().shooter.getBukkitEntity();
+    }
+
+    @Deprecated
+    public void _INVALID_setShooter(LivingEntity shooter) {
+        getHandle().shooter = ((CraftLivingEntity) shooter).getHandle();
+    }
 }

src/main/java/org/bukkit/craftbukkit/entity/CraftFireball.java

@@ -7,6 +7,7 @@ import org.bukkit.craftbukkit.CraftServer;
 import org.bukkit.entity.EntityType;
 import org.bukkit.entity.Fireball;
 import org.bukkit.entity.LivingEntity;
+import org.bukkit.projectiles.ProjectileSource;
 import org.bukkit.util.Vector;
 
 public class CraftFireball extends AbstractProjectile implements Fireball {
@@ -30,18 +31,17 @@ public class CraftFireball extends AbstractProjectile implements Fireball {
         getHandle().bukkitYield = yield;
     }
 
-    public LivingEntity getShooter() {
+    public ProjectileSource getShooter() {
-        if (getHandle().shooter != null) {
+        return getHandle().projectileSource;
-            return (LivingEntity) getHandle().shooter.getBukkitEntity();
     }
 
-        return null;
+    public void setShooter(ProjectileSource shooter) {
-    }
-
-    public void setShooter(LivingEntity shooter) {
         if (shooter instanceof CraftLivingEntity) {
-            getHandle().shooter = (EntityLiving) ((CraftLivingEntity) shooter).entity;
+            getHandle().shooter = ((CraftLivingEntity) shooter).getHandle();
+        } else {
+            getHandle().shooter = null;
         }
+        getHandle().projectileSource = shooter;
     }
 
     public Vector getDirection() {
@@ -65,4 +65,17 @@ public class CraftFireball extends AbstractProjectile implements Fireball {
     public EntityType getType() {
         return EntityType.UNKNOWN;
     }
+
+    @Deprecated
+    public void _INVALID_setShooter(LivingEntity shooter) {
+        setShooter(shooter);
+    }
+
+    @Deprecated
+    public LivingEntity _INVALID_getShooter() {
+        if (getHandle().shooter != null) {
+            return (LivingEntity) getHandle().shooter.getBukkitEntity();
+        }
+        return null;
+    }
 }

src/main/java/org/bukkit/craftbukkit/entity/CraftFish.java

@@ -9,6 +9,7 @@ import org.bukkit.craftbukkit.CraftServer;
 import org.bukkit.entity.EntityType;
 import org.bukkit.entity.Fish;
 import org.bukkit.entity.LivingEntity;
+import org.bukkit.projectiles.ProjectileSource;
 
 public class CraftFish extends AbstractProjectile implements Fish {
     private double biteChance = -1;
@@ -17,7 +18,7 @@ public class CraftFish extends AbstractProjectile implements Fish {
         super(server, entity);
     }
 
-    public LivingEntity getShooter() {
+    public ProjectileSource getShooter() {
         if (getHandle().owner != null) {
             return getHandle().owner.getBukkitEntity();
         }
@@ -25,7 +26,7 @@ public class CraftFish extends AbstractProjectile implements Fish {
         return null;
     }
 
-    public void setShooter(LivingEntity shooter) {
+    public void setShooter(ProjectileSource shooter) {
         if (shooter instanceof CraftHumanEntity) {
             getHandle().owner = (EntityHuman) ((CraftHumanEntity) shooter).entity;
         }
@@ -61,4 +62,14 @@ public class CraftFish extends AbstractProjectile implements Fish {
         Validate.isTrue(chance >= 0 && chance <= 1, "The bite chance must be between 0 and 1.");
         this.biteChance = chance;
     }
+
+    @Deprecated
+    public LivingEntity _INVALID_getShooter() {
+        return (LivingEntity) getShooter();
+    }
+
+    @Deprecated
+    public void _INVALID_setShooter(LivingEntity shooter) {
+        setShooter(shooter);
+    }
 }

src/main/java/org/bukkit/craftbukkit/entity/CraftLivingEntity.java

@@ -13,6 +13,7 @@ import net.minecraft.server.EntityEnderDragon;
 import net.minecraft.server.EntityEnderPearl;
 import net.minecraft.server.EntityFishingHook;
 import net.minecraft.server.EntityHuman;
+import net.minecraft.server.EntityFireball;
 import net.minecraft.server.EntityInsentient;
 import net.minecraft.server.EntityLargeFireball;
 import net.minecraft.server.EntityLiving;
@@ -293,8 +294,12 @@ public class CraftLivingEntity extends CraftEntity implements LivingEntity {
         return effects;
     }
 
-    @SuppressWarnings("unchecked")
     public <T extends Projectile> T launchProjectile(Class<? extends T> projectile) {
+        return launchProjectile(projectile, null);
+    }
+
+    @SuppressWarnings("unchecked")
+    public <T extends Projectile> T launchProjectile(Class<? extends T> projectile, Vector velocity) {
         net.minecraft.server.World world = ((CraftWorld) getWorld()).getHandle();
         net.minecraft.server.Entity launch = null;
 
@@ -324,11 +329,16 @@ public class CraftLivingEntity extends CraftEntity implements LivingEntity {
                 launch = new EntityLargeFireball(world, getHandle(), direction.getX(), direction.getY(), direction.getZ());
             }
 
+            ((EntityFireball) launch).projectileSource = this;
             launch.setPositionRotation(location.getX(), location.getY(), location.getZ(), location.getYaw(), location.getPitch());
         }
 
         Validate.notNull(launch, "Projectile not supported");
 
+        if (velocity != null) {
+            ((T) launch.getBukkitEntity()).setVelocity(velocity);
+        }
+
         world.addEntity(launch);
         return (T) launch.getBukkitEntity();
     }

src/main/java/org/bukkit/craftbukkit/entity/CraftProjectile.java

@@ -2,30 +2,32 @@ package org.bukkit.craftbukkit.entity;
 
 import net.minecraft.server.EntityLiving;
 import net.minecraft.server.EntityProjectile;
+
 import org.bukkit.craftbukkit.CraftServer;
 import org.bukkit.entity.LivingEntity;
 import org.bukkit.entity.Projectile;
+import org.bukkit.projectiles.ProjectileSource;
 
 public abstract class CraftProjectile extends AbstractProjectile implements Projectile {
     public CraftProjectile(CraftServer server, net.minecraft.server.Entity entity) {
         super(server, entity);
     }
 
-    public LivingEntity getShooter() {
+    public ProjectileSource getShooter() {
-        if (getHandle().getShooter() != null) {
+        return getHandle().projectileSource;
-            return (LivingEntity) getHandle().getShooter().getBukkitEntity();
     }
 
-        return null;
+    public void setShooter(ProjectileSource shooter) {
-    }
-
-    public void setShooter(LivingEntity shooter) {
         if (shooter instanceof CraftLivingEntity) {
             getHandle().shooter = (EntityLiving) ((CraftLivingEntity) shooter).entity;
             if (shooter instanceof CraftHumanEntity) {
                 getHandle().shooterName = ((CraftHumanEntity) shooter).getName();
             }
+        } else {
+            getHandle().shooter = null;
+            getHandle().shooterName = null;
         }
+        getHandle().projectileSource = shooter;
     }
 
     @Override
@@ -37,4 +39,24 @@ public abstract class CraftProjectile extends AbstractProjectile implements Proj
     public String toString() {
         return "CraftProjectile";
     }
+
+
+    @Deprecated
+    public LivingEntity _INVALID_getShooter() {
+        if (getHandle().shooter == null) {
+            return null;
+        }
+        return (LivingEntity) getHandle().shooter.getBukkitEntity();
+    }
+
+    @Deprecated
+    public void _INVALID_setShooter(LivingEntity shooter) {
+        if (shooter == null) {
+            return;
+        }
+        getHandle().shooter = ((CraftLivingEntity) shooter).getHandle();
+        if (shooter instanceof CraftHumanEntity) {
+            getHandle().shooterName = ((CraftHumanEntity) shooter).getName();
+        }
+    }
 }

src/main/java/org/bukkit/craftbukkit/projectiles/CraftBlockProjectileSource.java

@@ -0,0 +1,142 @@
+package org.bukkit.craftbukkit.projectiles;
+
+import java.util.Random;
+
+import org.apache.commons.lang.Validate;
+import org.bukkit.Material;
+import org.bukkit.block.Block;
+import org.bukkit.craftbukkit.inventory.CraftItemStack;
+import org.bukkit.entity.Arrow;
+import org.bukkit.entity.Egg;
+import org.bukkit.entity.EnderPearl;
+import org.bukkit.entity.Fireball;
+import org.bukkit.entity.Projectile;
+import org.bukkit.entity.SmallFireball;
+import org.bukkit.entity.Snowball;
+import org.bukkit.entity.ThrownExpBottle;
+import org.bukkit.entity.ThrownPotion;
+import org.bukkit.entity.WitherSkull;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.projectiles.BlockProjectileSource;
+import org.bukkit.util.Vector;
+
+import net.minecraft.server.BlockDispenser;
+import net.minecraft.server.EntityArrow;
+import net.minecraft.server.EntityEgg;
+import net.minecraft.server.EntityEnderPearl;
+import net.minecraft.server.EntityFireball;
+import net.minecraft.server.EntityLargeFireball;
+import net.minecraft.server.EntityPotion;
+import net.minecraft.server.EntityProjectile;
+import net.minecraft.server.EntitySmallFireball;
+import net.minecraft.server.EntitySnowball;
+import net.minecraft.server.EntityThrownExpBottle;
+import net.minecraft.server.EntityWitherSkull;
+import net.minecraft.server.EnumFacing;
+import net.minecraft.server.IPosition;
+import net.minecraft.server.IProjectile;
+import net.minecraft.server.MathHelper;
+import net.minecraft.server.SourceBlock;
+import net.minecraft.server.TileEntityDispenser;
+
+public class CraftBlockProjectileSource implements BlockProjectileSource {
+    private final TileEntityDispenser dispenserBlock;
+
+    public CraftBlockProjectileSource(TileEntityDispenser dispenserBlock) {
+        this.dispenserBlock = dispenserBlock;
+    }
+
+    @Override
+    public Block getBlock() {
+        return dispenserBlock.getWorld().getWorld().getBlockAt(dispenserBlock.x, dispenserBlock.y, dispenserBlock.z);
+    }
+
+    @Override
+    public <T extends Projectile> T launchProjectile(Class<? extends T> projectile) {
+        return launchProjectile(projectile, null);
+    }
+
+    @Override
+    public <T extends Projectile> T launchProjectile(Class<? extends T> projectile, Vector velocity) {
+        Validate.isTrue(getBlock().getType() == Material.DISPENSER, "Block is no longer dispenser");
+        // Copied from BlockDispenser.dispense()
+        SourceBlock isourceblock = new SourceBlock(dispenserBlock.getWorld(), dispenserBlock.x, dispenserBlock.y, dispenserBlock.z);
+        // Copied from DispenseBehaviorProjectile
+        IPosition iposition = BlockDispenser.a(isourceblock);
+        EnumFacing enumfacing = BlockDispenser.b(isourceblock.h());
+        net.minecraft.server.World world = dispenserBlock.getWorld();
+        net.minecraft.server.Entity launch = null;
+
+        if (Snowball.class.isAssignableFrom(projectile)) {
+            launch = new EntitySnowball(world, iposition.getX(), iposition.getY(), iposition.getZ());
+        } else if (Egg.class.isAssignableFrom(projectile)) {
+            launch = new EntityEgg(world, iposition.getX(), iposition.getY(), iposition.getZ());
+        } else if (EnderPearl.class.isAssignableFrom(projectile)) {
+            launch = new EntityEnderPearl(world);
+            launch.setPosition(iposition.getX(), iposition.getY(), iposition.getZ());
+        } else if (ThrownExpBottle.class.isAssignableFrom(projectile)) {
+            launch = new EntityThrownExpBottle(world, iposition.getX(), iposition.getY(), iposition.getZ());
+        } else if (ThrownPotion.class.isAssignableFrom(projectile)) {
+            launch = new EntityPotion(world, iposition.getX(), iposition.getY(), iposition.getZ(), CraftItemStack.asNMSCopy(new ItemStack(Material.POTION, 1)));
+        } else if (Arrow.class.isAssignableFrom(projectile)) {
+            launch = new EntityArrow(world, iposition.getX(), iposition.getY(), iposition.getZ());
+            ((EntityArrow) launch).fromPlayer = 1;
+            ((EntityArrow) launch).projectileSource = this;
+        } else if (Fireball.class.isAssignableFrom(projectile)) {
+            double d0 = iposition.getX() + (double) ((float) enumfacing.c() * 0.3F);
+            double d1 = iposition.getY() + (double) ((float) enumfacing.c() * 0.3F);
+            double d2 = iposition.getZ() + (double) ((float) enumfacing.e() * 0.3F);
+            Random random = world.random;
+            double d3 = random.nextGaussian() * 0.05D + (double) enumfacing.c();
+            double d4 = random.nextGaussian() * 0.05D + (double) enumfacing.d();
+            double d5 = random.nextGaussian() * 0.05D + (double) enumfacing.e();
+
+            if (SmallFireball.class.isAssignableFrom(projectile)) {
+                launch = new EntitySmallFireball(world, d0, d1, d2, d3, d4, d5);
+            } else if (WitherSkull.class.isAssignableFrom(projectile)) {
+                launch = new EntityWitherSkull(world);
+                launch.setPosition(d0, d1, d2);
+                double d6 = (double) MathHelper.sqrt(d3 * d3 + d4 * d4 + d5 * d5);
+
+                ((EntityFireball) launch).dirX = d3 / d6 * 0.1D;
+                ((EntityFireball) launch).dirY = d4 / d6 * 0.1D;
+                ((EntityFireball) launch).dirZ = d5 / d6 * 0.1D;
+            } else {
+                launch = new EntityLargeFireball(world);
+                launch.setPosition(d0, d1, d2);
+                double d6 = (double) MathHelper.sqrt(d3 * d3 + d4 * d4 + d5 * d5);
+
+                ((EntityFireball) launch).dirX = d3 / d6 * 0.1D;
+                ((EntityFireball) launch).dirY = d4 / d6 * 0.1D;
+                ((EntityFireball) launch).dirZ = d5 / d6 * 0.1D;
+            }
+            
+            ((EntityFireball) launch).projectileSource = this;
+        }
+
+        Validate.notNull(launch, "Projectile not supported");
+
+        if (launch instanceof IProjectile) {
+            if (launch instanceof EntityProjectile) {
+                ((EntityProjectile) launch).projectileSource = this;
+            }
+            // Values from DispenseBehaviorProjectile
+            float a = 6.0F;
+            float b = 1.1F;
+            if (launch instanceof EntityPotion || launch instanceof ThrownExpBottle) {
+                // Values from respective DispenseBehavior classes
+                a *= 0.5F;
+                b *= 1.25F;
+            }
+            // Copied from DispenseBehaviorProjectile
+            ((IProjectile) launch).shoot((double) enumfacing.c(), (double) ((float) enumfacing.d() + 0.1F), (double) enumfacing.e(), b, a);
+        }
+
+        if (velocity != null) {
+            ((T) launch.getBukkitEntity()).setVelocity(velocity);
+        }
+
+        world.addEntity(launch);
+        return (T) launch.getBukkitEntity();
+    }
+}