Extend EntityCombustEvent to allow setting combustion duration.

Also extend with two new events that track the entity or block that caused
the combustion.

By: Andrew Ardill <andrew.ardill@gmail.com>

paper-api/src/main/java/org/bukkit/entity/Projectile.java

@@ -25,6 +25,8 @@ public interface Projectile extends Entity {
     /**
      * Determine if this projectile should bounce or not when it hits.
      *
+     * If a small fireball does not bounce it will set the target on fire.
+     *
      * @return true if it should bounce.
      */
     public boolean doesBounce();

paper-api/src/main/java/org/bukkit/event/entity/EntityCombustByBlockEvent.java

@@ -0,0 +1,24 @@
+package org.bukkit.event.entity;
+
+import org.bukkit.block.Block;
+import org.bukkit.entity.Entity;
+
+public class EntityCombustByBlockEvent extends EntityCombustEvent {
+
+    private Block combuster;
+
+    public EntityCombustByBlockEvent(Block combuster, Entity combustee, int duration) {
+        super(combustee, duration);
+        this.combuster = combuster;
+    }
+
+    /**
+     * The combuster can be lava or a block that is on fire.
+     *
+     * WARNING: block may be null.
+     * @return the Block that set the combustee alight.
+     */
+    public Block getCombuster() {
+        return combuster;
+    }
+}

paper-api/src/main/java/org/bukkit/event/entity/EntityCombustByEntityEvent.java

@@ -0,0 +1,21 @@
+package org.bukkit.event.entity;
+
+import org.bukkit.entity.Entity;
+
+public class EntityCombustByEntityEvent extends EntityCombustEvent {
+
+    private Entity combuster;
+
+    public EntityCombustByEntityEvent(Entity combuster, Entity combustee, int duration) {
+        super(combustee, duration);
+        this.combuster = combuster;
+    }
+
+    /**
+     * The combuster can be a WeatherStorm a Blaze, or an Entity holding a FIRE_ASPECT enchanted item.
+     * @return the Entity that set the combustee alight.
+     */
+    public Entity getCombuster() {
+        return combuster;
+    }
+}

paper-api/src/main/java/org/bukkit/event/entity/EntityCombustEvent.java

@@ -4,15 +4,17 @@ import org.bukkit.entity.Entity;
 import org.bukkit.event.Cancellable;
 
 /**
- * Called when an entity combusts due to the sun.
+ * Called when an entity combusts.
  *<p />
  * If an Entity Combust event is cancelled, the entity will not combust.
  */
 public class EntityCombustEvent extends EntityEvent implements Cancellable {
+    private int duration;
     private boolean cancel;
 
-    public EntityCombustEvent(Entity what) {
-        super(Type.ENTITY_COMBUST, what);
+    public EntityCombustEvent(Entity combustee, int duration) {
+        super(Type.ENTITY_COMBUST, combustee);
+        this.duration = duration;
         this.cancel = false;
     }
 
@@ -23,4 +25,21 @@ public class EntityCombustEvent extends EntityEvent implements Cancellable {
     public void setCancelled(boolean cancel) {
         this.cancel = cancel;
     }
+
+    /**
+     * @return the amount of time (in seconds) the combustee should be alight for
+     */
+    public int getDuration() {
+        return duration;
+    }
+
+    /**
+     * The number of seconds the combustee should be alight for.
+     *
+     * This value will only ever increase the combustion time, not decrease existing combustion times.
+     * @param duration the time in seconds to be alight for.
+     */
+    public void setDuration(int duration) {
+        this.duration = duration;
+    }
 }

paper-api/src/main/java/org/bukkit/event/entity/EntityListener.java

@@ -27,7 +27,7 @@ public class EntityListener implements Listener {
     public void onItemSpawn(ItemSpawnEvent event) {}
 
     /**
-     * Called when an entity combusts due to the sun.
+     * Called when an entity combusts.
      *<p />
      * If an Entity Combust event is cancelled, the entity will not combust.
      *