Added the concept of an Explosive.

src/main/java/org/bukkit/entity/Explosive.java

@@ -0,0 +1,30 @@
+package org.bukkit.entity;
+
+/**
+ * A representation of an explosive entity
+ */
+public interface Explosive extends Entity {
+    /**
+     * Set the radius affected by this explosive's explosion
+     * @param yield
+     */
+    public void setYield(float yield);
+
+    /**
+     * Return the radius or yield of this explosive's explosion
+     * @return the radius of blocks affected
+     */
+    public float getYield();
+
+    /**
+     * Set whether or not this explosive's explosion causes fire
+     * @param isIncendiary
+     */
+    public void setIsIncendiary(boolean isIncendiary);
+
+    /**
+     * Return whether or not this explosive creates a fire when exploding
+     * @return true if the explosive creates fire, false otherwise
+     */
+    public boolean isIncendiary();
+}

src/main/java/org/bukkit/entity/Fireball.java

@@ -2,7 +2,5 @@ package org.bukkit.entity;
 
 /**
  * Represents a Fireball.
- *
- * @author Cogito
  */
-public interface Fireball extends Entity {}
+public interface Fireball extends Explosive {}

src/main/java/org/bukkit/entity/TNTPrimed.java

@@ -1,12 +1,18 @@
-/**
- *
- */
 package org.bukkit.entity;
 
 /**
  * Represents a Primed TNT.
- *
- * @author Cogito
- *
  */
-public interface TNTPrimed extends Entity {}
+public interface TNTPrimed extends Explosive {
+    /**
+     * Set the number of ticks until the TNT blows up after being primed.
+     * @param fuseTicks
+     */
+    public void setFuseTicks(int fuseTicks);
+
+    /**
+     * Retrieve the number of ticks until the explosion of this TNTPrimed entity
+     * @return the number of ticks until this TNTPrimed explodes
+     */
+    public int getFuseTicks();
+}

src/main/java/org/bukkit/event/entity/ExplosionPrimeEvent.java

@@ -1,6 +1,7 @@
 package org.bukkit.event.entity;
 
 import org.bukkit.entity.Entity;
+import org.bukkit.entity.Explosive;
 import org.bukkit.event.Cancellable;
 
 public class ExplosionPrimeEvent extends EntityEvent implements Cancellable {
@@ -15,6 +16,10 @@ public class ExplosionPrimeEvent extends EntityEvent implements Cancellable {
         this.fire = fire;
     }
 
+    public ExplosionPrimeEvent(Explosive explosive) {
+        this(explosive, explosive.getYield(), explosive.isIncendiary());
+    }
+
     public boolean isCancelled() {
         return cancel;
     }