[Bleeding] Implement new damage api. Fixes BUKKIT-5326, BUKKIT-3878.

This commit centralizes event handling to where damage is actually applied
to the entity to avoid bugs that have resulted from nodamageticks,
modifications to damage after the event has been called, and similar
mishaps. This also implements new API for getting and setting of
modifications made to the damage amount actually applied to the entity.
This is done by storing the change in the damage amount as each modifier
is applied by vanilla code.

The method that actually damages the armor worn by an entity has been
relocated beneath the event called as to not apply durability loss when
the event has been cancelled.

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

@@ -2,7 +2,7 @@ package net.minecraft.server;
 
 import java.util.Random;
 
-import org.bukkit.event.entity.EntityDamageByBlockEvent; // CraftBukkit
+import org.bukkit.craftbukkit.event.CraftEventFactory; // CraftBukkit
 
 public class BlockCactus extends Block {
 
@@ -24,7 +24,7 @@ public class BlockCactus extends Block {
                 int i1 = world.getData(i, j, k);
 
                 if (i1 == 15) {
-                    org.bukkit.craftbukkit.event.CraftEventFactory.handleBlockGrowEvent(world, i, j + 1, k, this, 0); // CraftBukkit
+                    CraftEventFactory.handleBlockGrowEvent(world, i, j + 1, k, this, 0); // CraftBukkit
                     world.setData(i, j, k, 0, 4);
                     this.doPhysics(world, i, j + 1, k, this);
                 } else {
@@ -79,22 +79,8 @@ public class BlockCactus extends Block {
     }
 
     public void a(World world, int i, int j, int k, Entity entity) {
-        // CraftBukkit start - EntityDamageByBlock event
+        CraftEventFactory.blockDamage = world.getWorld().getBlockAt(i, j, k); // CraftBukkit
-        if (entity instanceof EntityLiving) {
-            org.bukkit.block.Block damager = world.getWorld().getBlockAt(i, j, k);
-            org.bukkit.entity.Entity damagee = (entity == null) ? null : entity.getBukkitEntity();
-
-            EntityDamageByBlockEvent event = new EntityDamageByBlockEvent(damager, damagee, org.bukkit.event.entity.EntityDamageEvent.DamageCause.CONTACT, 1D);
-            world.getServer().getPluginManager().callEvent(event);
-
-            if (!event.isCancelled()) {
-                damagee.setLastDamageCause(event);
-                entity.damageEntity(DamageSource.CACTUS, (float) event.getDamage());
-            }
-            return;
-        }
-        // CraftBukkit end
-
         entity.damageEntity(DamageSource.CACTUS, 1.0F);
+        CraftEventFactory.blockDamage = null; // CraftBukkit
     }
 }

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

@@ -24,9 +24,8 @@ import org.bukkit.event.vehicle.VehicleExitEvent;
 import org.bukkit.craftbukkit.CraftWorld;
 import org.bukkit.craftbukkit.entity.CraftEntity;
 import org.bukkit.craftbukkit.entity.CraftPlayer;
+import org.bukkit.craftbukkit.event.CraftEventFactory;
 import org.bukkit.event.entity.EntityCombustEvent;
-import org.bukkit.event.entity.EntityDamageByBlockEvent;
-import org.bukkit.event.entity.EntityDamageEvent;
 import org.bukkit.event.entity.EntityPortalEvent;
 import org.bukkit.plugin.PluginManager;
 // CraftBukkit end
@@ -349,26 +348,17 @@ public abstract class Entity {
 
     protected void D() {
         if (!this.fireProof) {
+            this.damageEntity(DamageSource.LAVA, 4);
+
             // CraftBukkit start - Fallen in lava TODO: this event spams!
             if (this instanceof EntityLiving) {
-                Server server = this.world.getServer();
+                if (this.fireTicks <= 0) {
-
+                    // not on fire yet
                     // TODO: shouldn't be sending null for the block.
                     org.bukkit.block.Block damager = null; // ((WorldServer) this.l).getWorld().getBlockAt(i, j, k);
                     org.bukkit.entity.Entity damagee = this.getBukkitEntity();
-
-                EntityDamageByBlockEvent event = new EntityDamageByBlockEvent(damager, damagee, EntityDamageEvent.DamageCause.LAVA, 4D);
-                server.getPluginManager().callEvent(event);
-
-                if (!event.isCancelled()) {
-                    damagee.setLastDamageCause(event);
-                    this.damageEntity(DamageSource.LAVA, (float) event.getDamage());
-                }
-
-                if (this.fireTicks <= 0) {
-                    // not on fire yet
                     EntityCombustEvent combustEvent = new org.bukkit.event.entity.EntityCombustByBlockEvent(damager, damagee, 15);
-                    server.getPluginManager().callEvent(combustEvent);
+                    this.world.getServer().getPluginManager().callEvent(combustEvent);
 
                     if (!combustEvent.isCancelled()) {
                         this.setOnFire(combustEvent.getDuration());
@@ -381,7 +371,6 @@ public abstract class Entity {
             }
             // CraftBukkit end - we also don't throw an event unless the object in lava is living, to save on some event calls
 
-            this.damageEntity(DamageSource.LAVA, 4);
             this.setOnFire(15);
         }
     }
@@ -1617,12 +1606,14 @@ public abstract class Entity {
             }
         }
 
-        EntityDamageEvent event = org.bukkit.craftbukkit.event.CraftEventFactory.callEntityDamageEvent(entitylightning, this, EntityDamageEvent.DamageCause.LIGHTNING, 5D);
+        if (this.fireProof) {
-        if (event.isCancelled()) {
+            return;
+        }
+        CraftEventFactory.entityDamage = entitylightning;
+        if (!this.damageEntity(DamageSource.FIRE, 5.0F)) {
+            CraftEventFactory.entityDamage = null;
             return;
         }
-
-        this.burn((float) event.getDamage());
         // CraftBukkit end
 
         ++this.fireTicks;

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

@@ -5,9 +5,9 @@ import java.util.List;
 
 // CraftBukkit start
 import org.bukkit.block.BlockState;
+import org.bukkit.craftbukkit.event.CraftEventFactory;
 import org.bukkit.craftbukkit.util.BlockStateListPopulator;
 import org.bukkit.event.entity.EntityCreatePortalEvent;
-import org.bukkit.event.entity.EntityDamageEvent;
 import org.bukkit.event.entity.EntityExplodeEvent;
 import org.bukkit.event.entity.EntityRegainHealthEvent;
 import org.bukkit.event.entity.EntityTargetEvent;
@@ -302,15 +302,9 @@ public class EntityEnderDragon extends EntityInsentient implements IComplex, IMo
         if (this.bC != null) {
             if (this.bC.dead) {
                 if (!this.world.isStatic) {
-                    // CraftBukkit start
+                    CraftEventFactory.entityDamage = this.bC; // CraftBukkit
-                    EntityDamageEvent event = new EntityDamageEvent(this.getBukkitEntity(), org.bukkit.event.entity.EntityDamageEvent.DamageCause.ENTITY_EXPLOSION, 10.0F);
+                    this.a(this.bq, DamageSource.explosion((Explosion) null), 10.0F);
-                    Bukkit.getPluginManager().callEvent(event);
+                    CraftEventFactory.entityDamage = null; // CraftBukkit
-
-                    if (!event.isCancelled()) {
-                        getBukkitEntity().setLastDamageCause(event);
-                        this.a(this.bq, DamageSource.explosion((Explosion) null), (float) event.getDamage());
-                    }
-                    // CraftBukkit end
                 }
 
                 this.bC = null;

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

@@ -2,7 +2,7 @@ package net.minecraft.server;
 
 // CraftBukkit start
 import org.bukkit.Bukkit;
-import org.bukkit.event.entity.EntityDamageByEntityEvent;
+import org.bukkit.craftbukkit.event.CraftEventFactory;
 import org.bukkit.event.player.PlayerTeleportEvent;
 // CraftBukkit end
 
@@ -42,15 +42,9 @@ public class EntityEnderPearl extends EntityProjectile {
                     if (!teleEvent.isCancelled() && !entityplayer.playerConnection.isDisconnected()) {
                         entityplayer.playerConnection.teleport(teleEvent.getTo());
                         this.getShooter().fallDistance = 0.0F;
-
+                        CraftEventFactory.entityDamage = this;
-                        EntityDamageByEntityEvent damageEvent = new EntityDamageByEntityEvent(this.getBukkitEntity(), player, EntityDamageByEntityEvent.DamageCause.FALL, 5.0D);
+                        this.getShooter().damageEntity(DamageSource.FALL, 5.0F);
-                        Bukkit.getPluginManager().callEvent(damageEvent);
+                        CraftEventFactory.entityDamage = null;
-
-                        if (!damageEvent.isCancelled() && !entityplayer.playerConnection.isDisconnected()) {
-                            entityplayer.invulnerableTicks = -1; // Remove spawning invulnerability
-                            player.setLastDamageCause(damageEvent);
-                            entityplayer.damageEntity(DamageSource.FALL, (float) damageEvent.getDamage());
-                        }
                     }
                     // CraftBukkit end
                 }

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

@@ -3,10 +3,7 @@ package net.minecraft.server;
 import java.util.ArrayList;
 import java.util.Iterator;
 
-// CraftBukkit start
+import org.bukkit.craftbukkit.event.CraftEventFactory; // CraftBukkit
-import org.bukkit.craftbukkit.event.CraftEventFactory;
-import org.bukkit.event.entity.EntityDamageEvent;
-// CraftBukkit end
 
 public class EntityFallingBlock extends Entity {
 
@@ -156,16 +153,9 @@ public class EntityFallingBlock extends Entity {
                 while (iterator.hasNext()) {
                     Entity entity = (Entity) iterator.next();
 
-                    // CraftBukkit start
+                    CraftEventFactory.entityDamage = this; // CraftBukkit
-                    float damage = (float) Math.min(MathHelper.d((float) i * this.fallHurtAmount), this.fallHurtMax);
+                    entity.damageEntity(damagesource, (float) Math.min(MathHelper.d((float) i * this.fallHurtAmount), this.fallHurtMax));
-
+                    CraftEventFactory.entityDamage = null; // CraftBukkit
-                    EntityDamageEvent event = CraftEventFactory.callEntityDamageEvent(this, entity, EntityDamageEvent.DamageCause.FALLING_BLOCK, damage);
-                    if (event.isCancelled()) {
-                        continue;
-                    }
-
-                    entity.damageEntity(damagesource, (float) event.getDamage());
-                    // CraftBukkit end
                 }
 
                 if (flag && (double) this.random.nextFloat() < 0.05000000074505806D + (double) i * 0.05D) {

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

@@ -2,7 +2,7 @@ package net.minecraft.server;
 
 import java.util.List;
 
-import org.bukkit.event.entity.EntityDamageByEntityEvent; // CraftBukkit
+import org.bukkit.craftbukkit.event.CraftEventFactory; // CraftBukkit
 
 public abstract class EntityFireball extends Entity {
 
@@ -132,7 +132,7 @@ public abstract class EntityFireball extends Entity {
 
                 // CraftBukkit start - Fire ProjectileHitEvent
                 if (this.dead) {
-                    org.bukkit.craftbukkit.event.CraftEventFactory.callProjectileHitEvent(this);
+                    CraftEventFactory.callProjectileHitEvent(this);
                 }
                 // CraftBukkit end
             }
@@ -235,11 +235,7 @@ public abstract class EntityFireball extends Entity {
             this.P();
             if (damagesource.getEntity() != null) {
                 // CraftBukkit start
-                EntityDamageByEntityEvent event = new EntityDamageByEntityEvent(damagesource.getEntity().getBukkitEntity(), this.getBukkitEntity(), org.bukkit.event.entity.EntityDamageEvent.DamageCause.ENTITY_ATTACK, f);
+                if (!CraftEventFactory.handleNonLivingEntityDamageEvent(this, damagesource, f)) {
-
-                world.getServer().getPluginManager().callEvent(event);
-
-                if (event.isCancelled()) {
                     return false;
                 }
                 // CraftBukkit end

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

@@ -3,11 +3,7 @@ package net.minecraft.server;
 import java.util.Iterator;
 import java.util.List;
 
-// CraftBukkit start
+import org.bukkit.event.entity.EntityRegainHealthEvent.RegainReason; // CraftBukkit
-import org.bukkit.craftbukkit.event.CraftEventFactory;
-import org.bukkit.event.entity.EntityDamageEvent;
-import org.bukkit.event.entity.EntityRegainHealthEvent.RegainReason;
-// CraftBukkit end
 
 public class EntityHorse extends EntityAnimal implements IInventoryListener {
 
@@ -294,26 +290,9 @@ public class EntityHorse extends EntityAnimal implements IInventoryListener {
         int i = MathHelper.f(f * 0.5F - 3.0F);
 
         if (i > 0) {
-            // CraftBukkit start - fire EntityDamageEvent
+            this.damageEntity(DamageSource.FALL, (float) i);
-            EntityDamageEvent event = CraftEventFactory.callEntityDamageEvent(null, this, EntityDamageEvent.DamageCause.FALL, i);
-            if (!event.isCancelled()) {
-                float damage = (float) event.getDamage();
-                if (damage > 0) {
-                    this.getBukkitEntity().setLastDamageCause(event);
-                    this.damageEntity(DamageSource.FALL, damage);
-                }
-            }
-
             if (this.passenger != null) {
-                EntityDamageEvent passengerEvent = CraftEventFactory.callEntityDamageEvent(null, this.passenger, EntityDamageEvent.DamageCause.FALL, i);
+                this.passenger.damageEntity(DamageSource.FALL, (float) i);
-                if (!passengerEvent.isCancelled() && this.passenger != null) { // Check again in case of plugin
-                    float damage = (float) passengerEvent.getDamage();
-                    if (damage > 0) {
-                        this.passenger.getBukkitEntity().setLastDamageCause(passengerEvent);
-                        this.passenger.damageEntity(DamageSource.FALL, damage);
-                    }
-                }
-                // CraftBukkit end
             }
 
             Block block = this.world.getType(MathHelper.floor(this.locX), MathHelper.floor(this.locY - 0.2D - (double) this.lastYaw), MathHelper.floor(this.locZ));

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

@@ -799,7 +799,12 @@ public abstract class EntityHuman extends EntityLiving implements ICommandListen
         return (float) i / (float) this.inventory.armor.length;
     }
 
-    protected void d(DamageSource damagesource, float f) {
+    // CraftBukkit start
+    protected boolean d(DamageSource damagesource, float f) { // void -> boolean
+        if (true) {
+            return super.d(damagesource, f);
+        }
+        // CraftBukkit end
         if (!this.isInvulnerable()) {
             if (!damagesource.ignoresArmor() && this.isBlocking() && f > 0.0F) {
                 f = (1.0F + f) * 0.5F;
@@ -819,6 +824,7 @@ public abstract class EntityHuman extends EntityLiving implements ICommandListen
                 this.aV().a(damagesource, f2, f);
             }
         }
+        return false; // CraftBukkit
     }
 
     public void openFurnace(TileEntityFurnace tileentityfurnace) {}

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

@@ -24,8 +24,7 @@ public class EntityItemFrame extends EntityHanging {
         } else if (this.getItem() != null) {
             if (!this.world.isStatic) {
                 // CraftBukkit start - fire EntityDamageEvent
-                org.bukkit.event.entity.EntityDamageEvent event = org.bukkit.craftbukkit.event.CraftEventFactory.handleEntityDamageEvent(this, damagesource, f);
+                if (!org.bukkit.craftbukkit.event.CraftEventFactory.handleNonLivingEntityDamageEvent(this, damagesource, f) || this.dead) {
-                if ((event != null && event.isCancelled()) || this.dead) {
                     return true;
                 }
                 // CraftBukkit end

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

@@ -11,6 +11,7 @@ import java.util.UUID;
 import java.util.ArrayList;
 import org.bukkit.craftbukkit.event.CraftEventFactory;
 import org.bukkit.event.entity.EntityDamageEvent;
+import org.bukkit.event.entity.EntityDamageEvent.DamageModifier;
 import org.bukkit.event.entity.EntityRegainHealthEvent;
 // CraftBukkit end
 
@@ -646,7 +647,8 @@ public abstract class EntityLiving extends Entity {
             } else if (damagesource.o() && this.hasEffect(MobEffectList.FIRE_RESISTANCE)) {
                 return false;
             } else {
-                if ((damagesource == DamageSource.ANVIL || damagesource == DamageSource.FALLING_BLOCK) && this.getEquipment(4) != null) {
+                // CraftBukkit - Moved into d(DamageSource, float)
+                if (false && (damagesource == DamageSource.ANVIL || damagesource == DamageSource.FALLING_BLOCK) && this.getEquipment(4) != null) {
                     this.getEquipment(4).damage((int) (f * 4.0F + this.random.nextFloat() * f * 2.0F), this);
                     f *= 0.75F;
                 }
@@ -654,29 +656,28 @@ public abstract class EntityLiving extends Entity {
                 this.aF = 1.5F;
                 boolean flag = true;
 
-                // CraftBukkit start
-                EntityDamageEvent event = CraftEventFactory.handleEntityDamageEvent(this, damagesource, f);
-                if (event != null) {
-                    if (event.isCancelled()) {
-                        return false;
-                    }
-                    f = (float) event.getDamage();
-                }
-                // CraftBukkit end
-
                 if ((float) this.noDamageTicks > (float) this.maxNoDamageTicks / 2.0F) {
                     if (f <= this.lastDamage) {
                         return false;
                     }
 
-                    this.d(damagesource, f - this.lastDamage);
+                    // CraftBukkit start
+                    if (!this.d(damagesource, f - this.lastDamage)) {
+                        return false;
+                    }
+                    // CraftBukkit end
                     this.lastDamage = f;
                     flag = false;
                 } else {
+                    // CraftBukkit start
+                    float previousHealth = this.getHealth();
+                    if (!this.d(damagesource, f)) {
+                        return false;
+                    }
                     this.lastDamage = f;
-                    this.aw = this.getHealth();
+                    this.aw = previousHealth;
                     this.noDamageTicks = this.maxNoDamageTicks;
-                    this.d(damagesource, f);
+                    // CraftBukkit end
                     this.hurtTicks = this.ay = 10;
                 }
 
@@ -856,25 +857,16 @@ public abstract class EntityLiving extends Entity {
         super.b(f);
         MobEffect mobeffect = this.getEffect(MobEffectList.JUMP);
         float f1 = mobeffect != null ? (float) (mobeffect.getAmplifier() + 1) : 0.0F;
-        // CraftBukkit start
+        int i = MathHelper.f(f - 3.0F - f1);
-        float i = MathHelper.f(f - 3.0F - f1);
 
         if (i > 0) {
-            EntityDamageEvent event = CraftEventFactory.callEntityDamageEvent(null, this, EntityDamageEvent.DamageCause.FALL, i);
+            // CraftBukkit start
-            if (event.isCancelled()) {
+            if (!this.damageEntity(DamageSource.FALL, (float) i)) {
                 return;
             }
-
-            i = (float) event.getDamage();
-            if (i > 0) {
-                this.getBukkitEntity().setLastDamageCause(event);
-            }
-        }
             // CraftBukkit end
-
+            this.makeSound(this.o(i), 1.0F, 1.0F);
-        if (i > 0) {
+            // this.damageEntity(DamageSource.FALL, (float) i); // CraftBukkit - moved up
-            this.makeSound(this.o(org.bukkit.util.NumberConversions.ceil(i)), 1.0F, 1.0F); // CraftBukkit - ceil
-            this.damageEntity(DamageSource.FALL, (float) i);
             int j = MathHelper.floor(this.locX);
             int k = MathHelper.floor(this.locY - 0.20000000298023224D - (double) this.height);
             int l = MathHelper.floor(this.locZ);
@@ -917,7 +909,7 @@ public abstract class EntityLiving extends Entity {
             int i = 25 - this.aU();
             float f1 = f * (float) i;
 
-            this.h(f);
+            // this.h(f); // CraftBukkit - Moved into d(DamageSource, float)
             f = f1 / 25.0F;
         }
 
@@ -936,7 +928,8 @@ public abstract class EntityLiving extends Entity {
             int j;
             float f1;
 
-            if (this.hasEffect(MobEffectList.RESISTANCE) && damagesource != DamageSource.OUT_OF_WORLD) {
+            // CraftBukkit - Moved to d(DamageSource, float)
+            if (false && this.hasEffect(MobEffectList.RESISTANCE) && damagesource != DamageSource.OUT_OF_WORLD) {
                 i = (this.getEffect(MobEffectList.RESISTANCE).getAmplifier() + 1) * 5;
                 j = 25 - i;
                 f1 = f * (float) j;
@@ -962,22 +955,88 @@ public abstract class EntityLiving extends Entity {
         }
     }
 
-    protected void d(DamageSource damagesource, float f) {
+    // CraftBukkit start
+    protected boolean d(DamageSource damagesource, float f) { // void -> boolean
         if (!this.isInvulnerable()) {
+            boolean human = this instanceof EntityHuman;
+            float originalDamage = f;
+            float preDamage = f;
+            float hardHatModifier = 0;
+            if ((damagesource == DamageSource.ANVIL || damagesource == DamageSource.FALLING_BLOCK) && this.getEquipment(4) != null) {
+                f *= 0.75F;
+                hardHatModifier = preDamage - f;
+                preDamage = f;
+            }
+            float blockingModifier = 0;
+            if (human) {
+                if (!damagesource.ignoresArmor() && ((EntityHuman) this).isBlocking() && f > 0.0F) {
+                    f = (1.0F + f) * 0.5F;
+                    blockingModifier = preDamage - f;
+                    preDamage = f;
+                }
+            }
+            // Armor modifier
             f = this.b(damagesource, f);
+            float armorModifier = preDamage - f;
+            preDamage = f;
+            // Resistance Potion Effect
+            if (!damagesource.h() && this.hasEffect(MobEffectList.RESISTANCE) && damagesource != DamageSource.OUT_OF_WORLD) {
+                int i = (this.getEffect(MobEffectList.RESISTANCE).getAmplifier() + 1) * 5;
+                int j = 25 - i;
+                float f1 = f * (float) j;
+                f = f1 / 25.0F;
+            }
+            float resistanceModifier = preDamage - f;
+            preDamage = f;
+            // Magic modifier
             f = this.c(damagesource, f);
+            float magicModifier = preDamage - f;
             float f1 = f;
 
+            // Absorption modifier
             f = Math.max(f - this.br(), 0.0F);
-            this.m(this.br() - (f1 - f));
+            float absorptionModifier = Math.max(f1 - f, 0.0F);
+
+            EntityDamageEvent event = CraftEventFactory.handleLivingEntityDamageEvent(this, damagesource, originalDamage, -hardHatModifier, -blockingModifier, -armorModifier, -resistanceModifier, -magicModifier, -absorptionModifier);
+
+            if (event.isCancelled()) {
+                return false;
+            }
+
+            f = (float) event.getFinalDamage();
+
+            // Apply damage to helmet
+            if ((damagesource == DamageSource.ANVIL || damagesource == DamageSource.FALLING_BLOCK) && this.getEquipment(4) != null) {
+                this.getEquipment(4).damage((int) (event.getDamage() * 4.0F + this.random.nextFloat() * event.getDamage() * 2.0F), this);
+            }
+
+            // Apply damage to armor
+            if (!damagesource.ignoresArmor()) {
+                float armorDamage = (float) (event.getDamage() + event.getDamage(DamageModifier.BLOCKING) + event.getDamage(DamageModifier.HARD_HAT));
+                this.h(armorDamage);
+            }
+
+            absorptionModifier = (float) -event.getDamage(DamageModifier.ABSORPTION);
+            this.m(Math.max(this.br() - absorptionModifier, 0.0F));
             if (f != 0.0F) {
+                if (human) {
+                    ((EntityHuman) this).a(damagesource.f());
+                }
+                // CraftBukkit end
                 float f2 = this.getHealth();
 
                 this.setHealth(f2 - f);
                 this.aV().a(damagesource, f2, f);
+                // CraftBukkit start
+                if (human) {
+                    return true;
+                }
+                // CraftBukkit end
                 this.m(this.br() - f);
             }
+            return true; // CraftBukkit
         }
+        return false; // CraftBukkit
     }
 
     public CombatTracker aV() {

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

@@ -9,10 +9,7 @@ import java.util.Map;
 import java.util.Random;
 
 // CraftBukkit start
-import org.bukkit.Bukkit;
+import org.bukkit.craftbukkit.event.CraftEventFactory;
-import org.bukkit.event.entity.EntityDamageByBlockEvent;
-import org.bukkit.event.entity.EntityDamageByEntityEvent;
-import org.bukkit.event.entity.EntityDamageEvent;
 import org.bukkit.event.entity.EntityExplodeEvent;
 import org.bukkit.Location;
 // CraftBukkit end
@@ -130,55 +127,21 @@ public class Explosion {
                     double d9 = (double) this.world.a(vec3d, entity.boundingBox);
                     double d10 = (1.0D - d7) * d9;
 
-                    // CraftBukkit start - Explosion damage hook
+                    // CraftBukkit start
-                    org.bukkit.entity.Entity damagee = (entity == null) ? null : entity.getBukkitEntity();
+                    CraftEventFactory.entityDamage = source;
-                    float damageDone = (float) ((int) ((d10 * d10 + d10) / 2.0D * 8.0D * (double) this.size + 1.0D));
+                    if (!entity.damageEntity(DamageSource.explosion(this), (float) ((int) ((d10 * d10 + d10) / 2.0D * 8.0D * (double) this.size + 1.0D)))) {
-
+                        CraftEventFactory.entityDamage = null;
-                    if (damagee == null) {
+                        continue;
-                        // nothing was hurt
-                    } else if (this.source == null) { // Block explosion (without an entity source; bed etc.)
-                        EntityDamageByBlockEvent event = new EntityDamageByBlockEvent(null, damagee, EntityDamageEvent.DamageCause.BLOCK_EXPLOSION, damageDone);
-                        Bukkit.getPluginManager().callEvent(event);
-
-                        if (!event.isCancelled()) {
-                            damagee.setLastDamageCause(event);
-                            entity.damageEntity(DamageSource.explosion(this), (float) event.getDamage());
-                            double d11 = EnchantmentProtection.a(entity, d10);
-
-                            entity.motX += d0 * d11;
-                            entity.motY += d1 * d11;
-                            entity.motZ += d2 * d11;
-                            if (entity instanceof EntityHuman) {
-                                this.l.put((EntityHuman) entity, Vec3D.a(d0 * d10, d1 * d10, d2 * d10));
-                            }
-                        }
-                    } else {
-                        final org.bukkit.entity.Entity damager = this.source.getBukkitEntity();
-                        final EntityDamageEvent.DamageCause damageCause;
-
-                        if (damager instanceof org.bukkit.entity.TNTPrimed) {
-                            damageCause = EntityDamageEvent.DamageCause.BLOCK_EXPLOSION;
-                        } else {
-                            damageCause = EntityDamageEvent.DamageCause.ENTITY_EXPLOSION;
-                        }
-
-                        EntityDamageByEntityEvent event = new EntityDamageByEntityEvent(damager, damagee, damageCause, damageDone);
-                        Bukkit.getPluginManager().callEvent(event);
-
-                        if (!event.isCancelled()) {
-                            entity.getBukkitEntity().setLastDamageCause(event);
-                            entity.damageEntity(DamageSource.explosion(this), (float) event.getDamage());
-                            double d11 = EnchantmentProtection.a(entity, d10);
-
-                            entity.motX += d0 * d11;
-                            entity.motY += d1 * d11;
-                            entity.motZ += d2 * d11;
-                            if (entity instanceof EntityHuman) {
-                                this.l.put((EntityHuman) entity, Vec3D.a(d0 * d10, d1 * d10, d2 * d10));
-                            }
-                        }
                     }
                     // CraftBukkit end
+                    double d11 = EnchantmentProtection.a(entity, d10);
+
+                    entity.motX += d0 * d11;
+                    entity.motY += d1 * d11;
+                    entity.motZ += d2 * d11;
+                    if (entity instanceof EntityHuman) {
+                        this.l.put((EntityHuman) entity, Vec3D.a(d0 * d10, d1 * d10, d2 * d10));
+                    }
                 }
             }
         }

src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java

@@ -2,6 +2,8 @@ package org.bukkit.craftbukkit.event;
 
 import java.net.InetAddress;
 import java.util.ArrayList;
+import java.util.EnumMap;
+import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 
@@ -12,6 +14,8 @@ import net.minecraft.server.Entity;
 import net.minecraft.server.EntityArrow;
 import net.minecraft.server.EntityDamageSource;
 import net.minecraft.server.EntityDamageSourceIndirect;
+import net.minecraft.server.EntityEnderCrystal;
+import net.minecraft.server.EntityEnderDragon;
 import net.minecraft.server.EntityHuman;
 import net.minecraft.server.EntityInsentient;
 import net.minecraft.server.EntityItem;
@@ -41,6 +45,7 @@ import org.bukkit.craftbukkit.CraftStatistic;
 import org.bukkit.craftbukkit.CraftWorld;
 import org.bukkit.craftbukkit.block.CraftBlock;
 import org.bukkit.craftbukkit.block.CraftBlockState;
+import org.bukkit.craftbukkit.entity.CraftEntity;
 import org.bukkit.craftbukkit.entity.CraftLivingEntity;
 import org.bukkit.craftbukkit.entity.CraftPlayer;
 import org.bukkit.craftbukkit.inventory.CraftInventoryCrafting;
@@ -66,6 +71,7 @@ import org.bukkit.event.block.BlockIgniteEvent.IgniteCause;
 import org.bukkit.event.entity.*;
 import org.bukkit.event.entity.CreatureSpawnEvent.SpawnReason;
 import org.bukkit.event.entity.EntityDamageEvent.DamageCause;
+import org.bukkit.event.entity.EntityDamageEvent.DamageModifier;
 import org.bukkit.event.inventory.InventoryCloseEvent;
 import org.bukkit.event.inventory.InventoryOpenEvent;
 import org.bukkit.event.inventory.PrepareItemCraftEvent;
@@ -74,9 +80,13 @@ import org.bukkit.event.server.ServerListPingEvent;
 import org.bukkit.inventory.InventoryView;
 import org.bukkit.inventory.meta.BookMeta;
 
+import com.google.common.collect.ImmutableMap;
+
 public class CraftEventFactory {
     public static final DamageSource MELTING = CraftDamageSource.copyOf(DamageSource.BURN);
     public static final DamageSource POISON = CraftDamageSource.copyOf(DamageSource.MAGIC);
+    public static org.bukkit.block.Block blockDamage; // For use in EntityDamageByBlockEvent
+    public static Entity entityDamage; // For use in EntityDamageByEntityEvent
 
     // helper methods
     private static boolean canBuild(CraftWorld world, Player player, int x, int z) {
@@ -393,15 +403,23 @@ public class CraftEventFactory {
         return event;
     }
 
-    /**
+    private static EntityDamageEvent handleEntityDamageEvent(Entity entity, DamageSource source, Map<DamageModifier, Double> modifiers) {
-     * EntityDamage(ByEntityEvent)
+        if (source.isExplosion()) {
-     */
+            DamageCause damageCause;
-    public static EntityDamageEvent callEntityDamageEvent(Entity damager, Entity damagee, DamageCause cause, double damage) {
+            Entity damager = entityDamage;
+            entityDamage = null;
             EntityDamageEvent event;
-        if (damager != null) {
+            if (damager == null) {
-            event = new EntityDamageByEntityEvent(damager.getBukkitEntity(), damagee.getBukkitEntity(), cause, damage);
+                event = new EntityDamageByBlockEvent(null, entity.getBukkitEntity(), DamageCause.BLOCK_EXPLOSION, modifiers);
+            } else if (entity instanceof EntityEnderDragon && ((EntityEnderDragon) entity).bC == damager) {
+                event = new EntityDamageEvent(entity.getBukkitEntity(), DamageCause.ENTITY_EXPLOSION, modifiers);
             } else {
-            event = new EntityDamageEvent(damagee.getBukkitEntity(), cause, damage);
+                if (damager instanceof org.bukkit.entity.TNTPrimed) {
+                    damageCause = DamageCause.BLOCK_EXPLOSION;
+                } else {
+                    damageCause = DamageCause.ENTITY_EXPLOSION;
+                }
+                event = new EntityDamageByEntityEvent(damager.getBukkitEntity(), entity.getBukkitEntity(), damageCause, modifiers);
             }
 
             callEvent(event);
@@ -409,13 +427,7 @@ public class CraftEventFactory {
             if (!event.isCancelled()) {
                 event.getEntity().setLastDamageCause(event);
             }
-
             return event;
-    }
-
-    public static EntityDamageEvent handleEntityDamageEvent(Entity entity, DamageSource source, float damage) {
-        if (source.isExplosion()) {
-            return null;
         } else if (source instanceof EntityDamageSource) {
             Entity damager = source.getEntity();
             DamageCause cause = DamageCause.ENTITY_ATTACK;
@@ -431,9 +443,47 @@ public class CraftEventFactory {
                 cause = DamageCause.THORNS;
             }
 
-            return callEntityDamageEvent(damager, entity, cause, damage);
+            return callEntityDamageEvent(damager, entity, cause, modifiers);
         } else if (source == DamageSource.OUT_OF_WORLD) {
-            EntityDamageEvent event = callEvent(new EntityDamageByBlockEvent(null, entity.getBukkitEntity(), DamageCause.VOID, damage));
+            EntityDamageEvent event = callEvent(new EntityDamageByBlockEvent(null, entity.getBukkitEntity(), DamageCause.VOID, modifiers));
+            if (!event.isCancelled()) {
+                event.getEntity().setLastDamageCause(event);
+            }
+            return event;
+        } else if (source == DamageSource.LAVA) {
+            EntityDamageEvent event = callEvent(new EntityDamageByBlockEvent(null, entity.getBukkitEntity(), DamageCause.LAVA, modifiers));
+            if (!event.isCancelled()) {
+                event.getEntity().setLastDamageCause(event);
+            }
+            return event;
+        } else if (blockDamage != null) {
+            DamageCause cause = null;
+            Block damager = blockDamage;
+            blockDamage = null;
+            if (source == DamageSource.CACTUS) {
+                cause = DamageCause.CONTACT;
+            } else {
+                throw new RuntimeException("Unhandled entity damage");
+            }
+            EntityDamageEvent event = callEvent(new EntityDamageByBlockEvent(damager, entity.getBukkitEntity(), cause, modifiers));
+            if (!event.isCancelled()) {
+                event.getEntity().setLastDamageCause(event);
+            }
+            return event;
+        } else if (entityDamage != null) {
+            DamageCause cause = null;
+            CraftEntity damager = entityDamage.getBukkitEntity();
+            entityDamage = null;
+            if (source == DamageSource.ANVIL || source == DamageSource.FALLING_BLOCK) {
+                cause = DamageCause.FALLING_BLOCK;
+            } else if (damager instanceof LightningStrike) {
+                cause = DamageCause.LIGHTNING;
+            } else if (source == DamageSource.FALL) {
+                cause = DamageCause.FALL;
+            } else {
+                throw new RuntimeException("Unhandled entity damage");
+            }
+            EntityDamageEvent event = callEvent(new EntityDamageByEntityEvent(damager, entity.getBukkitEntity(), cause, modifiers));
             if (!event.isCancelled()) {
                 event.getEntity().setLastDamageCause(event);
             }
@@ -459,23 +509,56 @@ public class CraftEventFactory {
             cause = DamageCause.POISON;
         } else if (source == DamageSource.MAGIC) {
             cause = DamageCause.MAGIC;
+        } else if (source == DamageSource.FALL) {
+            cause = DamageCause.FALL;
         }
 
         if (cause != null) {
-            return callEntityDamageEvent(null, entity, cause, damage);
+            return callEntityDamageEvent(null, entity, cause, modifiers);
         }
 
-        // If an event was called earlier, we return null.
+        throw new RuntimeException("Unhandled entity damage");
-        // EG: Cactus, Lava, EntityEnderPearl "fall", FallingSand
-        return null;
     }
 
-    // Non-Living Entities such as EntityEnderCrystal need to call this
+    private static EntityDamageEvent callEntityDamageEvent(Entity damager, Entity damagee, DamageCause cause, Map<DamageModifier, Double> modifiers) {
-    public static boolean handleNonLivingEntityDamageEvent(Entity entity, DamageSource source, float damage) {
+        EntityDamageEvent event;
-        if (!(source instanceof EntityDamageSource)) {
+        if (damager != null) {
+            event = new EntityDamageByEntityEvent(damager.getBukkitEntity(), damagee.getBukkitEntity(), cause, modifiers);
+        } else {
+            event = new EntityDamageEvent(damagee.getBukkitEntity(), cause, modifiers);
+        }
+
+        callEvent(event);
+
+        if (!event.isCancelled()) {
+            event.getEntity().setLastDamageCause(event);
+        }
+
+        return event;
+    }
+
+    public static EntityDamageEvent handleLivingEntityDamageEvent(Entity damagee, DamageSource source, double rawDamage, double hardHatModifier, double blockingModifier, double armorModifier, double resistanceModifier, double magicModifier, double absorptionModifier) {
+        Map<DamageModifier, Double> modifiers = new HashMap<DamageModifier, Double>();
+        modifiers.put(DamageModifier.BASE, rawDamage);
+        if (source == DamageSource.FALLING_BLOCK || source == DamageSource.ANVIL) {
+            modifiers.put(DamageModifier.HARD_HAT, hardHatModifier);
+        }
+        if (damagee instanceof EntityHuman) {
+            modifiers.put(DamageModifier.BLOCKING, blockingModifier);
+        }
+        modifiers.put(DamageModifier.ARMOR, armorModifier);
+        modifiers.put(DamageModifier.RESISTANCE, resistanceModifier);
+        modifiers.put(DamageModifier.MAGIC, magicModifier);
+        modifiers.put(DamageModifier.ABSORPTION, absorptionModifier);
+        return handleEntityDamageEvent(damagee, source, new EnumMap<DamageModifier, Double>(modifiers));
+    }
+
+    // Non-Living Entities such as EntityEnderCrystal, EntityItemFrame, and EntityFireball need to call this
+    public static boolean handleNonLivingEntityDamageEvent(Entity entity, DamageSource source, double damage) {
+        if (entity instanceof EntityEnderCrystal && !(source instanceof EntityDamageSource)) {
             return false;
         }
-        EntityDamageEvent event = handleEntityDamageEvent(entity, source, damage);
+        EntityDamageEvent event = handleEntityDamageEvent(entity, source, new EnumMap<DamageModifier, Double>(ImmutableMap.of(DamageModifier.BASE, (double) damage)));
         if (event == null) {
             return false;
         }