Added the implementation of the concept of an Explosive.

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

@@ -5,6 +5,7 @@ import java.util.List;
 // CraftBukkit start
 import org.bukkit.craftbukkit.CraftServer;
 import org.bukkit.craftbukkit.entity.CraftEntity;
+import org.bukkit.entity.Explosive;
 import org.bukkit.event.entity.EntityDamageByProjectileEvent;
 import org.bukkit.event.entity.EntityDamageEvent;
 import org.bukkit.event.entity.EntityDamageEvent.DamageCause;
@@ -26,6 +27,9 @@ public class EntityFireball extends Entity {
     public double d;
     public double e;
 
+    public float yield = 1; // CraftBukkit
+    public boolean isIncendiary = true; // CraftBukkit
+
     public EntityFireball(World world) {
         super(world);
         this.b(1.0F, 1.0F);
@@ -151,7 +155,7 @@ public class EntityFireball extends Entity {
 
                 CraftServer server = ((WorldServer) this.world).getServer();
 
-                ExplosionPrimeEvent event = new ExplosionPrimeEvent(CraftEntity.getEntity(server, this), 1.0F, true);
+                ExplosionPrimeEvent event = new ExplosionPrimeEvent((Explosive) CraftEntity.getEntity(server, this));
 
                 server.getPluginManager().callEvent(event);
                 if (!event.isCancelled()) {

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

@@ -3,12 +3,15 @@ package net.minecraft.server;
 // CraftBukkit start
 import org.bukkit.craftbukkit.CraftServer;
 import org.bukkit.craftbukkit.entity.CraftEntity;
+import org.bukkit.entity.Explosive;
 import org.bukkit.event.entity.ExplosionPrimeEvent;
 // CraftBukkit end
 
 public class EntityTNTPrimed extends Entity {
 
     public int a;
+    public float yield = 4; // CraftBukkit
+    public boolean isIncendiary = false; // CraftBukkit
 
     public EntityTNTPrimed(World world) {
         super(world);
@@ -72,12 +75,12 @@ public class EntityTNTPrimed extends Entity {
     }
 
     private void explode() {
-        float f = 4.0F;
-
         // CraftBukkit start
+        // float f = 4.0F;
+
         CraftServer server = ((WorldServer) this.world).getServer();
 
-        ExplosionPrimeEvent event = new ExplosionPrimeEvent(CraftEntity.getEntity(server, this), f, false);
+        ExplosionPrimeEvent event = new ExplosionPrimeEvent((Explosive) CraftEntity.getEntity(server, this));
         server.getPluginManager().callEvent(event);
 
         if (!event.isCancelled()) {

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

@@ -7,8 +7,6 @@ import org.bukkit.entity.Fireball;
 
 /**
  * A Fireball.
- *
- * @author Cogito
  */
 public class CraftFireball extends CraftEntity implements Fireball {
     public CraftFireball(CraftServer server, EntityFireball entity) {
@@ -19,4 +17,20 @@ public class CraftFireball extends CraftEntity implements Fireball {
     public String toString() {
         return "CraftFireball";
     }
+
+    public float getYield() {
+        return ((EntityFireball) getHandle()).yield;
+    }
+
+    public boolean isIncendiary() {
+        return ((EntityFireball) getHandle()).isIncendiary;
+    }
+
+    public void setIsIncendiary(boolean isIncendiary) {
+        ((EntityFireball) getHandle()).isIncendiary = isIncendiary;
+    }
+
+    public void setYield(float yield) {
+        ((EntityFireball) getHandle()).yield = yield;
+    }
 }

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

@@ -16,4 +16,28 @@ public class CraftTNTPrimed extends CraftEntity implements TNTPrimed {
         return "CraftTNTPrimed";
     }
 
+    public float getYield() {
+        return ((EntityTNTPrimed) getHandle()).yield;
+    }
+
+    public boolean isIncendiary() {
+        return ((EntityTNTPrimed) getHandle()).isIncendiary;
+    }
+
+    public void setIsIncendiary(boolean isIncendiary) {
+        ((EntityTNTPrimed) getHandle()).isIncendiary = isIncendiary;
+    }
+
+    public void setYield(float yield) {
+        ((EntityTNTPrimed) getHandle()).yield = yield;
+    }
+
+    public int getFuseTicks() {
+        return ((EntityTNTPrimed) getHandle()).a;
+    }
+
+    public void setFuseTicks(int fuseTicks) {
+        ((EntityTNTPrimed) getHandle()).a = fuseTicks;
+    }
+
 }